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<SEC-DOCUMENT>0000912057-01-506536.txt : 20010409
<SEC-HEADER>0000912057-01-506536.hdr.sgml : 20010409
ACCESSION NUMBER:		0000912057-01-506536
CONFORMED SUBMISSION TYPE:	10-K
PUBLIC DOCUMENT COUNT:		31
CONFORMED PERIOD OF REPORT:	20001231
FILED AS OF DATE:		20010402

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CUBIST PHARMACEUTICALS INC
		CENTRAL INDEX KEY:			0000912183
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				223192085
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		10-K
		SEC ACT:		
		SEC FILE NUMBER:	000-21379
		FILM NUMBER:		1592057

	BUSINESS ADDRESS:	
		STREET 1:		24 EMILY ST
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139
		BUSINESS PHONE:		6075761999

	MAIL ADDRESS:	
		STREET 1:		24 EMILY ST
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139
</SEC-HEADER>
<DOCUMENT>
<TYPE>10-K
<SEQUENCE>1
<FILENAME>a2042768z10-k.txt
<DESCRIPTION>10-K
<TEXT>

<PAGE>



                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              ---------------------

                                    FORM 10-K

                  FOR ANNUAL AND TRANSITION REPORTS PURSUANT TO
           SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

|X|  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934

                  For the fiscal year ended: DECEMBER 31, 2000

|_| TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
    ACT OF 1934

  For the transition period from: _________________ to _________________

                         Commission file number: 0-21379

                          CUBIST PHARMACEUTICALS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

           DELAWARE                                          22-3192085
  (STATE OR OTHER JURISDICTION                             (I.R.S. EMPLOYER
  OF INCORPORATION OR ORGANIZATION)                       IDENTIFICATION NO.)

      24 EMILY STREET, CAMBRIDGE, MA                            02139
  (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                   ( ZIP CODE)

Registrant's telephone number,
including area code:                                        (617) 576-1999

Securities registered pursuant to
Section 12(b) of the Act:

TITLE OF EACH CLASS                    NAME OF EACH EXCHANGE ON WHICH REGISTERED
      NONE                                               NONE

Securities registered pursuant to Section 12(g) of the Act:

                          COMMON STOCK, $.001 PAR VALUE
                                (TITLE OF CLASS)

     Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes  X   No
                                             -----   -----

     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-X is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. /X/

     The aggregate market value of the registrant's common stock, $.001 par
value per share ("Common Stock"), held by non-affiliates of the registrant as
of March 28, 2001 was approximately $654,799,928, based on 26,932,091 shares
held by such non-affiliates at the closing price of a share of Common Stock
of $24.313 as reported on the Nasdaq National Market on such date. Affiliates
of the Company (defined as officers, directors and owners of 10 percent or
more of the outstanding share of Common Stock) owned 1,026,363 shares of
Common Stock outstanding on such date. The number of outstanding shares of
Common Stock of the Company on March 28, 2001 was 27,958,454.

<PAGE>
                                      -2-


                          CUBIST PHARMACEUTICALS, INC.
                           ANNUAL REPORT ON FORM 10-K

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>

ITEM                                                                            PAGE
                                     PART I
<S>                                                                             <C>
1.   Business                                                                      3
2.   Description of Property                                                      28
3.   Legal Proceedings                                                            29
4.   Submission of Matters to a Vote of Security Holders                          29

                                     PART II

5.   Market For Registrant's Common Stock and Related Stockholder Matters         29
6.   Selected Financial Data                                                      30
7.   Management's Discussion and Analysis of Financial Condition and Results of
     Operations                                                                   31
7A.  Quantitative and Qualitative Disclosures About Market Risk                   37
8.   Financial Statements and Supplementary Data                                  38
9.   Changes in and Disagreements With Accountants on Accounting And Financial
     Disclosure                                                                   63

                                    PART III

10.  Directors and Executive Officers of the Registrant                           63
11.  Executive Compensation                                                       63
12.  Security Ownership of Certain Beneficial Owners Management                   63
13.  Certain Relationships and Related Transactions                               63

                                     PART IV

14.  Exhibits, Financial Statement Schedules, and Reports on Form 8-K
     Signatures                                                                   63

</TABLE>

<PAGE>
                                      -3-


          SPECIAL NOTE ON FORWARD-LOOKING STATEMENTS AND INDUSTRY DATA

     This annual report contains forward-looking statements within the meaning
of Section 27A of the Securities Act of 1933 and Section 21E of the Securities
Exchange Act of 1934, including statements regarding our drug development and
discovery programs, clinical trials, receipt of regulatory approval, capital
needs, collaborative agreements, intellectual property, expectations and
intentions. Forward-looking statements may be identified or qualified by words
such as "likely," "will," "suggests," "may," "would," "could," "should,"
"expects," "anticipates," "estimates," "plans," "projects," "believes," or
similar expressions and variants of those words or expressions.

     Forward-looking statements necessarily involve risks and uncertainties, and
our actual results could differ materially from those anticipated in the
forward-looking statements due to a number of factors, including those set forth
above under "Risk Factors" and elsewhere in this annual report. The factors set
forth above in the "Risk Factors" section and other cautionary statements made
in this annual report should be read and understood as being applicable to all
related forward-looking statements wherever they appear in this annual report.
The forward-looking statements contained in this annual report represent our
judgment as of the date of this annual report. We caution readers not to place
undue reliance on such statements. We undertake no obligation to update publicly
any forward-looking statements for any reason, even if new information becomes
available or other events occur in the future.

     Information regarding market and industry statistics contained in this
annual report is included based on information available to us that we believe
is accurate. It is generally based on academic and other publications. We have
not independently verified all data and cannot assure you of the accuracy of the
data we have included.

                                     PART I

PART I

ITEM 1. BUSINESS

CORPORATE OVERVIEW

     Cubist Pharmaceuticals, Inc. is a specialty pharmaceutical company
focused on the research, development and commercialization of novel
antimicrobial drugs to combat serious and life-threatening bacterial and
fungal infections. Cidecin (daptomycin for injection), our lead product
candidate and the first in a new class of antimicrobial drug candidates
called lipopeptides, has demonstrated the unique ability IN VITRO to rapidly
kill virtually all clinically significant Gram-positive bacteria, including
those that have become resistant to current therapies. Multiple Phase III
trials are currently underway examining the safety and efficacy of Cidecin in
the treatment of complicated skin and soft tissue infection,
community-acquired pneumonia and complicated urinary tract infection. An
open-label Phase II trial using Cidecin for the treatment of bacteremia was
recently completed and future trials are planned in the treatment of
endocarditis and certain resistant infections. Assuming the successful
completion of Phase III clinical trials, we plan to file with the United
States Food and Drug Administration by mid-2002 a New Drug Application.

     We recently expanded our product pipeline by announcing the development of
an oral formulation of daptomycin and by acquiring the worldwide rights to
research, develop, manufacture and sell oral ceftriaxone, the first orally
active version of Rocephin, the largest-selling intravenous antibiotic
worldwide. Each of these programs is in the pre-clinical stage of development.
In addition, our internal research and drug discovery activities are focused on
the discovery of new drug candidates from the lipopeptide class, including a
'next generation' daptomycin, and entirely new classes of antimicrobial drug
candidates, while we continue to be involved in multiple, strategic partnerships
with other pharmaceutical companies, including Novartis Pharma AG and Merck &
Co., for the discovery and development of novel antiinfectives.

     We utilize our VITA, ChemInformatics, NatGen, NatChem and BioDiversity
technologies to identify additional novel compounds with a broad spectrum of
activity against a variety of infections.


<PAGE>
                                      -4-


OVERVIEW OF INFECTIOUS DISEASE AND DRUG RESISTANCE

     Infectious diseases are caused by pathogens present in the environment,
such as bacteria and fungi, that enter the body through the skin or mucous
membranes of the lungs, nasal passages or gastrointestinal tract, and overwhelm
the body's immune system. These pathogens then establish themselves in various
tissues and organs throughout the body and cause a number of serious and, in
some cases, lethal infections, including those of the bloodstream, skin and soft
tissue, heart, lung and urinary tract.

     According to The World Health Report, 1999, infectious diseases remained
the leading cause of death worldwide. According to industry sources, in 1999 the
global systemic antibiotic market was estimated to be valued at $25 billion and
there were at least 13 branded antimicrobials with more than $300 million in
annual sales worldwide. Emerging infections contribute substantially to the
ongoing burden of infectious disease in the U.S. According to a 1994 CDC report,
infectious diseases account for 25% of all visits to physicians each year, and
antimicrobial agents are the second most frequently prescribed class of drugs.
Over the past several years, there has been a rise in the incidence of
infectious diseases caused by bacteria and fungi that have developed resistance
to existing antimicrobial drugs. The increasing prevalence of drug-resistant
bacterial and fungal pathogens has led to significantly higher mortality rates,
prolonged hospitalizations, and higher health care costs from infectious
disease.

     Antimicrobial drugs have, in many cases, proven highly successful in
controlling the serious morbidity and mortality that accompany these infections.
These drugs work by binding to specific targets in a bacterial or fungal
pathogen, thereby inhibiting a cell function essential to the cell's survival.
During the 1970's and the 1980's, many antimicrobials were developed and
introduced into the market. Most of these antimicrobials were from existing
antimicrobial classes such as semi-synthetic penicillins, cephalosporins,
macrolides, quinolones and carbapenems. Many of these antimicrobials proved to
be effective in treating infectious diseases and pharmaceutical companies
shifted their resources to other areas of drug discovery and development. As a
result, only one new antimicrobial agent has been introduced from a new chemical
class in the past 25 years.

     Over the past several years, there has been a rise in the incidence of
serious and life-threatening infections caused by Gram-positive bacteria,
particularly in hospitalized patients. Gram-positive and Gram-negative bacteria
have fundamentally different cell surface characteristics. These cell surface
characteristics greatly affect the ability of an antibiotic to penetrate the
bacteria and reach its target site. The rising incidence of serious and
life-threatening infections in hospitals is believed to be caused by the
changing nature of the hospital patient population and by the emergence of
bacteria and fungi that are resistant to existing antimicrobial drugs.

     In recent years, the proportion of hospital patients that have compromised
immune systems has risen sharply. This trend is the result of, among other
things, the rising incidence of cancer and the associated use of chemotherapy,
the general aging of the patient population and the increased use of complex
surgical procedures such as organ transplants. Hospital patients with
compromised immune systems are more susceptible to serious and life-threatening
infections.

     The rise in the incidence of infectious diseases caused by bacteria and
fungi that have developed resistance to existing antimicrobial drugs is a
natural outcome of the use and overuse of antimicrobial drugs. When bacteria or
fungi are exposed to an antimicrobial drug, the drug kills or inhibits the
growth of the susceptible pathogen. However, any variant in the bacterial
population that has spontaneously undergone a genetic change that confers drug
resistance will have a selective growth advantage, known in evolutionary terms
as natural selection. Thus, the antimicrobial drug does not cause the resistance
but creates an environment in which the resistant pathogen can multiply in the
presence of the drug, increasing the population of the resistant pathogen and
making it the predominant pathogen. These resistant pathogens can then spread
rapidly throughout the community.

     Certain pathogens have developed resistance to all currently available
drugs. Examples of such Gram-positive resistant pathogens include:

     o    METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS, OR MRSA: STAPHYLOCOCCUS
          AUREUS is a common bacterial pathogen that causes serious and
          life-threatening infections, and routinely acquires characteristics of
          drug resistance, virulence and toxicity. MRSA strains can cause severe
          tissue damage to existing wounds and can cause bacteremia, both of
          which have a high mortality rate.


<PAGE>
                                      -5-


     o    VANCOMYCIN RESISTANT ENTEROCOCCI, OR VRE: The emergence of VRE strains
          in the 1990's has led to infections for which only very limited
          commercially available therapy exists. Hospital-based VRE has
          continued to rapidly rise in the United States, resulting in increased
          mortality rates.

     o    GLYCOPEPTIDE INTERMEDIATELY SUSCEPTIBLE STAPHYLOCOCCUS AUREUS, OR
          GISA: The first reports of STAPHYLOCOCCUS AUREUS infections with
          decreased susceptibility to vancomycin occurred in 1998. Such
          bacterial strains have been found in a wide geographical area
          throughout Japan and North America and have recently emerged in
          Europe. The medical community expects that fully drug-resistant
          STAPHYLOCOCCUS AUREUS strains will emerge from GISA as additional
          resistance to vancomycin develops.

SHORTCOMINGS OF CURRENT THERAPIES

     Current therapies do not provide adequate treatment for some serious and
life-threatening infections for the following reasons:

     o    Some existing antimicrobial drugs do not kill the pathogens that cause
          the infection but merely inhibit their growth (called bacteriostatic
          agents) thereby allowing the immune system to destroy the pathogen.
          Bacteriostatic drugs are less effective in immunocompromised patients
          than antimicrobial drugs that kill the pathogens (called bactericidal
          agents) because their weakened immune systems cannot rid their bodies
          of the pathogens.

     o    Many antimicrobials are effective against some serious and
          life-threatening infections but not others. This may be because the
          antimicrobial drug is not active against a particular type of pathogen
          or because a strain of this pathogen has developed resistance to the
          antimicrobial drug. Many of the serious and life-threatening
          infections occur in hospital patients whose immune systems are
          compromised. These infections are complicated and may be caused by
          more than one kind of pathogen. In addition, since these infections
          are life threatening, physicians treating these patients cannot wait
          for the test results necessary to identify the exact nature of the
          pathogen or pathogens causing the infection.

     o    Some pathogens have become resistant to all antimicrobials and there
          are no available antimicrobial drugs to effectively treat the
          infections caused by these drug-resistant pathogens. Vancomycin is the
          current treatment of choice for patients that have serious and
          life-threatening infections that have failed to respond to all other
          antimicrobials. However, it has been widely reported in recent years
          that several strains of enterococci have developed resistance to
          vancomycin. Currently, there are limited commercially available
          therapeutic alternatives to treat these strains of VRE.

     o    Many existing antimicrobial drugs used to treat serious and
          life-threatening infections are difficult or inconvenient to
          administer. Most of these antimicrobial drugs must be administered
          multiple times a day in order to be effective, are not well tolerated
          by patients or require lengthy infusion times when administered in a
          single daily dose. Moreover, intravenous administration of some of
          these antimicrobial drugs does not occur through the veins in the arm
          but through catheters in the central venous system. The difficulty or
          inconvenience of administration of these drugs make them less
          attractive choices for home therapy or other therapy outside the
          hospital. Existing antimicrobial drugs may cause side effects in some
          patients, such as severe allergic reaction, lower blood pressure,
          inflammation and swelling at the site of injection and headaches. Some
          of these side effects may be significant enough to require that
          therapy be discontinued.

          OUR BUSINESS STRATEGY

     Our objective is to be a worldwide leader in the research, development
and commercialization of new antimicrobial drugs to combat serious and
life-threatening Gram-positive bacterial and fungal infections, including
those caused by drug-resistant pathogens. The principal elements of our
strategy to achieve this objective include the following:

     DEVELOP AND COMMERCIALIZE CIDECIN. We are developing Cidecin (daptomycin
for injection) to treat serious and life-threatening bacterial infections,
including those caused by drug-resistant pathogens. Assuming the successful
completion of Phase III human clinical trials, we intend to file a new drug
application with the FDA by mid-2002. We have the exclusive right to develop,
manufacture and market Cidecin and are evaluating strategies for its worldwide
commercialization.


<PAGE>
                                      -6-


     DEVELOP PRE-CLINICAL CANDIDATES. As a result of corporate development
efforts in 2000, we now have two drug candidates in pre-clinical development: an
oral formulation of daptomycin and an oral formulation of ceftriaxone, the first
orally active version of Rocephin, the largest-selling intravenous antibiotic
worldwide. If the pre-clinical studies planned throughout 2001 are successful,
we anticipate filing Investigational New Drug Applications, or IND's, with the
FDA and beginning human clinical trials on oral ceftriaxone and oral daptomycin
in 2002.

     LICENSE NEW DRUGS AND NEW DRUG CANDIDATES. Our internal expertise allows us
to recognize viable licensing opportunities and to save time and money in
successfully developing antimicrobials by capitalizing on research initially
conducted and funded by others. We intend to continue to review and acquire
compounds with promising characteristics as antimicrobial drug candidates.

     DISCOVER AND DEVELOP NEW ANTIMICROBIAL DRUGS. We focus our research and
drug discovery activities on identifying new classes of antimicrobial drugs and
on developing one or more antimicrobial drugs from each of these new classes. We
believe that antimicrobial drugs from new classes will be effective against
drug-resistant bacterial and fungal pathogens because these pathogens have not
had an opportunity to develop resistance specific to these drugs. We have a
research and development effort underway focused on a new class of
antimicrobials called lipopeptides. Daptomycin is a member of the lipopeptide
class and, as a result of our work with daptomycin, we have developed expertise
in the chemistry and biology of lipopeptides. Our proprietary lipopeptide
program is focused on identifying new lipopeptide antimicrobial compounds for
the treatment of a broad spectrum of serious and life-threatening bacterial
infections.

     UTILIZE OUR VITA FUNCTIONAL GENOMICS, NATURAL PRODUCTS AND CHEMINFORMATICS
TECHNOLOGIES TO ACCELERATE THE DISCOVERY OF ANTIMICROBIAL DRUGS. We utilize our
VITA, Natural Products and ChemInformatics technologies in our internal research
programs to identify novel compounds with a broad spectrum of activity against
life-threatening infectious organisms including resistant strains such as MRSA
and VRE. Our technologies attempt to accelerate the generation of leads for
medicinal chemistry programs resulting in faster development of antimicrobial
drugs and lower costs by efficiently using resources throughout the drug
discovery process.

     LICENSE OUR VITA FUNCTIONAL GENOMICS AND OTHER TECHNOLOGIES TO
PHARMACEUTICAL AND BIOTECHNOLOGY COMPANIES. We plan to continue to generate
revenues by licensing our VITA functional genomics, our natural products and
other technologies as drug discovery platforms.

DEVELOPMENT PIPELINE

I. CIDECIN (DAPTOMYCIN FOR INJECTION)

     OVERVIEW. Daptomycin is the first member of a new class of antimicrobial
drugs called lipopeptides. Under laboratory conditions, or IN VITRO,
daptomycin rapidly kills virtually all clinically significant Gram-positive
bacteria, including the resistant strains of VRE, MRSA and GISA. The
Gram-positive bacteria targeted by daptomycin cause serious infections,
including endocarditis or infection of the valves of the heart, osteomyelitis
or infection of bone or bone marrow, complicated skin and soft tissue
infections, bacteremia, complicated urinary tract infections and pneumoniae.
In November 1997, we licensed from Eli Lilly & Company the exclusive rights
to manufacture and market daptomycin. We are currently evaluating the
efficacy and safety of an intravenous version of daptomycin, which we have
branded as "Cidecin", in a clinical program with Phase I, Phase II and Phase
III trials currently underway.

     CIDECIN ADVANTAGES. We believe that Cidecin could provide the following key
benefits:

     o    ACTIVE AGAINST GRAM-POSITIVE BACTERIA. Cidecin is effective IN VITRO
          against virtually all clinically significant Gram-positive bacteria,
          including VRE, MRSA and GISA. We believe that Cidecin's broad spectrum
          of IN VITRO activity could give it a clinical therapeutic advantage in
          treating serious and life-threatening infections because Cidecin could
          be used to treat these infections regardless of which Gram-positive
          bacterium is causing the infection.

     o    RAPIDLY KILLS BACTERIA (BACTERICIDAL). Cidecin rapidly kills virtually
          all clinically significant Gram-positive bacteria IN VITRO. We believe
          this could give Cidecin a clinical therapeutic advantage in treating
          serious and life-threatening infections, particularly in patients that
          have compromised immune systems, as compared to other drugs that do
          not kill the bacteria but rather only inhibit their growth and rely on
          the immune system to destroy the



<PAGE>
                                      -7-


          bacteria. Use of the growth-inhibiting rather than bacteria-killing
          drugs to treat serious and life-threatening infections is riskier
          because, even if the growth-inhibiting drug works, it is possible that
          the immune system will not be able to destroy the bacteria causing the
          infection.

     o    EFFECTIVE AGAINST DRUG-RESISTANT BACTERIA. Studies have shown that
          Cidecin is effective IN VITRO against drug-resistant bacteria,
          including VRE and GISA. Vancomycin, a glycopeptide, we believe
          could become the treatment of choice for patients that have serious
          Gram-positive infections that have failed to respond to all other
          drugs. Recently, however, several strains of enterococci have
          developed resistance to vancomycin and strains of STAPHYLOCOCCUS
          AUREUS have become intermediately susceptible to vancomycin.
          Currently, there are limited therapeutic alternatives to treat VRE
          and GISA strains. We believe that Cidecin will become the therapy
          of choice to treat infections caused by drug-resistant
          Gram-positive bacteria.

     o    EASE OF ADMINISTRATION. In our current clinical trials, Cidecin is
          administered in a single daily dose, intravenously, over approximately
          30 minutes. Cidecin should have an advantage over several other
          antimicrobial drugs that require administration in multiple doses each
          day, that take longer than 30 minutes to administer or that are
          administered through a central venous catheter located in parts of the
          body other than the arm.

     CIDECIN CLINICAL DATA. In the late 1980's Eli Lilly conducted 19 Phase I
safety trials and 2 Phase II efficacy and dosing trials of intravenous
daptomycin for the treatment of skin and soft tissue infections and bacteremia.
A total of 352 patients participated in these trials.

     On the basis of daptomycin's IN VITRO activity against clinically
significant bacteria, its bacteria-killing mode of action and its promising
profile in the Eli Lilly Phase I and Phase II trials, we began further clinical
evaluation of intravenous daptomycin. In December 1998, we filed an IND with the
FDA and began Phase II and Phase III trials in February 1999 in order to
evaluate the safety and efficacy of intravenous daptomycin in patients with
complicated skin and soft tissue infections and in patients with bacteremia.

     On March 5, 2000, we presented the results from two dose-ranging Phase II
open-label trials at the CDC's conference on Nocosomial and
Healthcare-Associated Infections. The objective of these Phase II trials was to
investigate dose selection based on clinical efficacy and safety. The first
trial was focused on patients diagnosed with bacteremia. The second trial was
focused on patients who had failed or were unable to tolerate other therapies
for the treatment of serious Gram-positive infections, including bacteremia,
complicated skin and soft tissue, complicated urinary tract infection,
intra-abdominal infection and pneumonia, which we call the RRC study. The Phase
II trial data combined for both studies included 56 patients and showed that
Cidecin administered once-a-day at 4 mg/kg had a 91% clinical success rate. In
addition, Cidecin administered once-a-day at 4 mg/kg demonstrated an 86%
clinical success rate in the subset of patients infected with a
vancomycin-resistant pathogen or who were refractory or intolerant to
vancomycin. Cidecin also had a safety profile similar to standard therapies.

     On May 31, 2000, additional data were presented from the two ongoing Phase
II open-label trials at the European Congress of Clinical Microbiology and
Infectious Diseases. The combined data included 101 enrolled patients. At a dose
of 4 mg/kg in a once-daily regimen, Cidecin had an overall clinical success rate
of 92% in the modified intent-to-treat population and 100% on the clinically
evaluable patients. In terms of microbiologic eradication, Cidecin demonstrated
a 75% success rate in the modified intent-to-treat population and a 93% success
rate in microbiologically evaluable patients. Notably, the data show that in the
RRC study, Cidecin demonstrated a clinical success rate of 86%. As a result of
the data collected thus far, a dose of 4 mg/kg was chosen for all Phase III
pivotal trials.

     On September 18, 2000, further data were presented at the Interscience
Conference on Antimicrobial Agents and Chemotherapy combining the data from the
4 mg/kg once-daily dosing regimens in the bacteremia and RRC studies completed
to date. Cidecin had an overall clinical success rate of 93% in the modified
intent-to-treat population and 100% on the clinically evaluable patients. In
terms of microbiologic eradication, Cidecin demonstrated a 75% success rate in
the modified intent-to-treat population and a 100% success rate in
microbiologically evaluable patients. Comparable vancomycin data in the
bacteremia trial demonstrated a 64% clinical success rate in the modified
intent-to-treat population. These additional data presented were consistent with
the data announced earlier in the year.

     Also at the Interscience Conference on Antimicrobial Agents and
Chemotherapy, results were announced from a Cidecin Phase I dose escalation
study intended to assess the safety, tolerability and pharmacokinetics of
Cidecin given once a


<PAGE>
                                      -8-



day at increasing doses. In the study, volunteers received once-daily doses of
Cidecin at 4 mg/kg, 6 mg/kg or 8 mg/kg for up to 14 days. The results of the
study showed that no serious adverse events occurred in any patients at any of
the doses studied.

     On March 14, 2001, we announced preliminary results from our first, pivotal
Phase III trial examining the safety and efficacy of Cidecin in the treatment of
complicated skin and soft tissue infection caused by Gram-positive bacteria. We
were able to announce that the primary endpoint of demonstrating equivalency to
comparator agents was achieved as per the protocol previously reviewed by the
FDA. More detailed results from this study will be available after April 3,
2001, when the safety and efficacy data are expected to be presented at the
European Congress of Clinical Microbiology and Infectious Diseases in Istanbul,
Turkey.

     CIDECIN SAFETY PROFILE. In our clinical trials to date, observed side
effects in patients treated with Cidecin have been comparable to those observed
in patients treated with standard therapies.

     CIDECIN CLINICAL PLAN. The clinical plan for Cidecin is designed to enroll
a sufficient number of patients necessary for the safety and efficacy analysis
to obtain FDA approval. The following table shows our clinical studies currently
completed, underway and planned.

<TABLE>
<CAPTION>
                                                                          GEOGRAPHIC
INFECTION                      STATUS                  TIMING                SCOPE
<S>                          <C>                <C>                       <C>

Bacteremia                    Phase II           Completed in 4Q:00        U.S.

Resistant, Refractory         Phase II           Completed in 3Q:00        U.S.
or Contraindicated

Complicated Skin              Phase III          Completed in 1Q:01        International
and Soft Tissue Infection

Complicated Skin              Phase III          Commenced in 2Q:99        Worldwide
and Soft Tissue Infection

Community-Acquired            Phase III          Commenced in 1Q:01        Worldwide
Pneumonia (CAP 1)

Community Acquired            Phase III          Expected to Commence      Worldwide
Pneumonia (CAP 2)                                in 2Q:01

Complicated Urinary Tract     Phase III          Commenced in 4Q:00        Worldwide
Infection

Endocarditis                  Phase II/III       Expected to Commence      U.S.
                                                 in mid-2001

VRE Infection                 Phase III          Expected to Commence      U.S.
                                                 in mid-2001
</TABLE>

     We are considering additional clinical trials designed to expand the
indications and commercial opportunity for Cidecin to other clinical
applications, including osteomyelitis.

II. ORAL CEFTRIAXONE

     In late November 2000, we announced that we had acquired worldwide rights
to research, develop, manufacture and sell oral ceftriaxone from International
Health Management Associates, Inc., a privately held company located in
Illinois. The formulation is the first orally active version of the
largest-selling intravenous (IV) antibiotic worldwide, Hoffmann-LaRoche's
Rocephin, which had sales of over $1.2 billion in 1999. Terms of the acquisition
were not disclosed.


<PAGE>
                                      -9-


     Gram-positive and Gram-negative bacteria are responsible for the majority
of community-based infections, which include upper and lower respiratory tract
infections (including otitis media, sinusitis, bronchitis and community-acquired
pneumonia) and skin and soft tissue infections. These infections result in
nearly 80 million treated patients annually in the United States.

     Intravenous ceftriaxone is a third-generation cephalosporin and has
demonstrated a broad spectrum of bactericidal antimicrobial activity against
Gram-positive and Gram-negative bacteria. To date, intravenous ceftriaxone has
been primarily used to treat hospital in-patients due to the lack of an oral
version. Nonetheless, intravenous ceftriaxone has been successfully and safely
prescribed for over 15 years in both adults and children. If successfully
developed, we believe that an oral formulation could greatly expand the utility
and revenue potential of ceftriaxone through community-based prescribing. In
addition, we believe oral ceftriaxone could also be used for the continuation of
antibiotic therapy by converting intravenous therapy to oral therapy, otherwise
known as step-down therapy. Step-down therapy provides multiple benefits,
including convenience and cost savings, potential earlier hospital discharge,
the reduction of associated healthcare costs and increased physician confidence
in an optimal therapeutic outcome given that a discharged patient is receiving
the same therapy that was taken intravenously in the hospital setting.

     Our oral formulation of ceftriaxone is currently in pre-clinical
development. If pre-clinical studies proceed positively, we expect to file an
IND to begin human clinical trials during the first half of 2002.

III. ORAL DAPTOMYCIN

     In November 2000, Cubist and Emisphere Technologies of Tarrytown, New
York, announced a research agreement to develop an oral formulation of
daptomycin. The agreement followed successful completion of
proof-of-principle feasibility studies using Emisphere carrier molecules and
daptomycin. At that time, we announced that we had been able to show that
after oral administration, the degree to which oral daptomycin became
available was sufficient to achieve efficacy in an infected rodent model.

     If successfully developed, oral daptomycin would enable Cubist to
compete in the market for step-down therapy from IV to oral, should the IV
formulation also receive FDA approval. The ability to treat infected patients
with daptomycin on an outpatient basis could be an important contributor to a
reduction in healthcare costs.

     Pre-clinical testing of oral daptomycin is ongoing. If development
continues with positive results, we anticipate filing an IND to begin human
clinical trials in the first half of 2002.

IV. LIPOPEPTIDE PROGRAM

     Daptomycin is the first member of a new class of chemical molecules called
lipopeptides. With traditional classes of antimicrobials, such as the
penicillins, multiple antimicrobial drugs have been developed. Therefore, we
expect there will be additional clinically useful lipopeptides with the
potential for commercialization. We are engaged in a comprehensive lipopeptide
drug discovery and development program based on our expertise on the chemistry
and biology of lipopeptides that we have acquired through our development work
with daptomycin. We have initiated a research program focused on the design,
synthesis and evaluation of new lipopeptides with improved properties over
daptomycin including increased IN VITRO potency, particularly against the
enterococcus, and with the ability to kill laboratory-developed
daptomycin-resistant strains of bacteria. We have filed multiple patent
applications on several different series of novel analogs. We expect to select a
novel lipopeptide IND candidate by mid-2001.

OUR DRUG DISCOVERY PROGRAMS AND TECHNOLOGIES

     Our drug discovery technologies are an integral part of our mission to
accelerate the discovery of novel antiinfectives. Through experience and
acquisition, we have amassed a comprehensive portfolio of proprietary methods
for both discovering novel pharmaceuticals and also validating novel
antiinfective targets. Through our acquisition of TerraGen Discovery Inc. of
Vancouver, British Columbia, we have increased our focus on the use of
biodiversity as a means of natural product drug discovery, while also using
traditional ChemInformatics techniques.

     Over 40% of the largest-selling pharmaceuticals on the market today are
derived from naturally existing substances. In the area of antiinfectives, there
are four natural products with annual sales over $1 billion--Augmentin,
Zithromax, Biaxin and


<PAGE>
                                      -10-



Rocephin. The majority of these natural products have been derived from
microorganisms called microbes that live in soil and other environments. As part
of their daily existence, microbes produce substances--both proteins and small
molecules--that are known to have a variety of functions, including signaling to
other microbes and as defense mechanisms against other species. It is these
substances that are of interest pharmaceutically, because they are already
biologically active by definition.

     Due to previous technical limitations, only about 1% of existing microbes
has been accessible to scientists for evaluation. However, this 1% is
responsible for tens of billions of dollars in annual pharmaceutical sales. The
technology we acquired from TerraGen Discovery enables the evaluation of the
remaining 99% of microbes; an untapped pool of natural diversity that we hope
will prove to be a rich source of pharmaceutical leads and products.

     We have developed and continue to implement novel technologies to
accelerate the process of drug discovery. To discover new antimicrobials for
clinical development, our discovery platform integrates the scientific
disciplines and technologies required for target validation and assay
development, high-throughput screening and medicinal chemistry.


     OUR PROPRIETARY NATURAL PRODUCTS DRUG DISCOVERY TECHNOLOGIES

     As a result of the acquisition by Cubist of TerraGen Discovery Inc, a
privately held company headquartered in Vancouver, BC, Canada, in October 2000,
we acquired multiple proprietary technologies in the area of natural products
drug discovery. These technologies create a comprehensive portfolio of drug
discovery technologies, that, when used in conjunction with sophisticated
fermentation and extraction methods, quickly eliminate the bottlenecks that
currently exist in the natural products drug discovery process. This technology
portfolio includes natural products technologies including NatPure, NatChem,
NatGen, and biosynthesis technologies, which encompass capabilities including
chemical library generation, high-throughput screening and chemical analysis to
generate purified, fully chemically characterized lead compounds with biological
activity against specific therapeutic targets.


     o    NAT PURE. The NatPure library contains semi-purified extracts derived
          from our NatChem and NatGen libraries. The advantage of this library
          arises from its ability to reduce the time required to advance from
          hit to identification of a lead structure. Extracts are selected for
          inclusion on the basis of chemical profile, biological activity and
          taxonomy.


     o    NATCHEM. Our NatChem library comprises compound extracts from a unique
          collection of rare, diverse fungi and actinomycetes. Designed for
          maximum chemical diversity, a range of fermentation conditions are
          employed for each organism. The resource is continually evaluated and
          improved by replacing the most heavily screened extracts with new
          extracts derived from previously unexploited organisms. The library
          consists of 54,000 partially characterized extracts.


     o    NATGEN. Our NatGen library is under continuous construction. Using
          proprietary technologies, large fragments of DNA that encode metabolic
          pathways from both uncultivable and cultivable organisms are cloned
          into surrogate hosts to generate recombinant strains producing novel
          secondary metabolites. These novel metabolites may result entirely
          from the randomly cloned metabolic pathway or by Combinatorial
          Biosynthesis, where interactions of the cloned metabolic pathway with
          the host's own metabolic pathways yield novel chemical compounds that
          are not found in Nature.

     o    DIRECTED BIOSYNTHESIS. Using Directed Biosynthesis the metabolic
          pathway for a specific natural product is genetically modified to
          produce novel natural product analogs. This directed evolution of
          metabolic pathways also produces new chemical classes of compounds not
          found in Nature.

     OUR PROPRIETARY VITA FUNCTIONAL GENOMICS TECHNOLOGY

     Our Validation IN VIVO of Targets and Assays for Antiinfectives, or VITA,
technology is a functional genomics tool that quickly generates biological
information useful for identifying the most valuable drug discovery targets from
clinically important pathogens such as STAPHYLOCOCCUS AUREUS. The technology
allows validated targets to be rapidly enabled for high-throughput

<PAGE>
                                      -11-




screening assays used for the identification of quality lead compounds for
medicinal chemistry programs. VITA is broadly applicable to both validation IN
VIVO and screening IN VITRO of drug discovery targets with diverse functions,
including those targets that the scientific community has not previously been
able to screen.

     An antimicrobial drug acts during an infection by binding to a specific
target and inhibiting its function. Target inhibition leads to impaired pathogen
growth or pathogen cell death; consequently the infected subject survives the
infection. The method by which novel targets are validated using the VITA
technology is analogous to how an antibiotic inhibits its target during an
established infection. A target is validated if a causal link is established
between the target and a cellular response important in a disease process.
Utilizing VITA, a target is validated by initially identifying a peptide that
specifically binds to the target and subsequently regulating the production of
the peptide in the pathogen during an established infection in mice. If the
target is essential for pathogen survival, production of the peptide will
inhibit target function and prevent pathogen growth, and the mice will survive.
If the inhibition of the target is not essential for pathogen survival, the
pathogen will continue to thrive and the mice will die from the infection. The
peptide used to specifically inhibit the target can then be used in a
high-throughput screening assay to identify small molecule compounds. We have
filed patent applications in connection with our VITA technology. In February
1999, we entered into a collaborative research and license agreement with
Novartis in which we granted Novartis a non-exclusive license to the VITA
technology. As of this filing, two novel, validated antiinfective targets and
screening assays had been delivered to Novartis, triggering milestone payments
to Cubist by Novartis.

     OUR PROPRIETARY CHEMINFORMATICS TECHNOLOGY

     To enhance our ability to use high-throughput screening and data from
target-based assays, we have designed and implemented a discovery approach
called ChemInformatics. Industry-wide experience has demonstrated that having
high-throughput screening assays and large numbers of compounds to screen does
not consistently yield lead compounds suitable for medicinal chemistry. This
problem is especially acute in antimicrobials where, to be effective, lead
compounds need to be active against multiple pathogen species and to have
properties that permit pathogen cell-wall penetration. Our ChemInformatics
approach bridges the gap between high-throughput screening and medicinal
chemistry and serves as the drug discovery engine that fuels our medicinal
chemistry programs. ChemInformatics integrates high-throughput screening,
enzymology, combinatorial chemistry and computational chemistry to generate
three-dimensional models that are predictive for biological activity. Using
these models, many novel series of compounds can be designed to have the proper
chemical properties to be antimicrobial agents. We are currently applying our
ChemInformatics technology to a number of different target-based programs that
utilize high-throughput screening. Our ChemInformatics technology has produced
two classes of novel antimicrobial compounds that have been exclusively licensed
to Merck.

     HIGH-THROUGHPUT SCREENING

     We utilize automation, robotics and assay technologies to perform
high-throughput screening of compound libraries to identify novel inhibitors.
Thousands of compounds a day may be screened in VITA-generated target-based and
whole cell assays. Inhibitors may be further characterized using our secondary
screening assays where increasingly stringent selection criteria are applied to
identify lead candidates with the greatest potential for successful medicinal
chemistry programs.

     In natural products screening, our proprietary macrodroplet screening
technology eliminates the need to ferment, extract and assay individual
cultures. The technology is a miniaturized ultra high-throughput system that
integrates library production and screening into one system. It can efficiently
screen millions of recombinant strains annually against a broad panel of
antibacterial and antifungal bioassays and can be adapted for different host
organisms for a wide range of applications. The technology provides for the
rapid determination of desired biological activities, temporal and spatial
detection of secondary metabolite synthesis, easy recovery of active recombinant
clones, application of mammalian cell-based assays, and further automation for
clone detection and sorting.

     MEDICINAL CHEMISTRY

     Medicinal chemistry refers to an iterative process where lead series of
compounds are optimized to yield new drug candidates. We have implemented
systems that allow for the optimization of many series of compounds for any
given target. In each compound series, we place an emphasis on extensively
evaluating the profile of compounds including microbiological and IN VIVO
properties. Our integrated chemistry and biology teams focus on the key
parameters that need improvement for a series to advance to drug development. By
utilizing many chemical series for each target, we increase the chances that
these series will


<PAGE>
                                      -12-



overcome the IN VIVO hurdles to pre-clinical development. To accelerate this
process, we have put into place high-throughput systems for preparing, purifying
and testing compounds.

OUR COLLABORATIVE AGREEMENTS

     We seek to enter into drug discovery and development collaboration
agreements to discover, develop and commercialize novel antimicrobials. In
addition to providing us with funding, our collaborations give us access to
libraries of diverse compounds and to the clinical development, manufacturing
and commercialization capabilities of the partners.

     NOVARTIS

     In February 1999 we announced the signing of a research and license
collaboration agreement with Novartis Pharma to use our proprietary VITA
technology to validate and develop assays for antiinfective targets and to
identify new compounds for development as antiinfective agents. Novartis was
granted a non-exclusive license to the VITA technology and exclusive licenses to
specific targets, assays and compounds. Under certain circumstances, we will
have co-exclusive rights with Novartis to particular targets and assays.

     Upon the signing of the collaboration, Novartis made an up-front, $4
million equity investment in us. The collaboration agreement contemplated that
Novartis would provide us with research funding annually for three years, with
an option to terminate at the end of two years. The total value of the
collaboration to Cubist based on the equity investment, research funding and
potential milestone payments could exceed $33 million, assuming that two
products are ultimately developed. In addition, we will receive royalties on net
sales of each product stemming from the collaboration.

     In October 2000, we announced the achievement of the first milestone in the
collaboration with Novartis and received a payment of $500,000 for the delivery
of a validated target and a high-throughput screening assay for antiinfective
drug discovery. Shortly thereafter, as a result of the success of the
collaboration, in November 2000, Novartis agreed to extend the collaboration to
its full three years, or until February 2002. Then in January 2001, we announced
the achievement of a second milestone in the collaboration through the delivery
of another validated antiinfective target and high-throughput screening assay.

     Both parties are screening their respective compound libraries against the
assays developed in the collaboration. Novartis will optimize any candidates and
will conduct appropriate pre-clinical testing. The work conducted under the
collaboration is reviewed by a management committee composed of representatives
from both companies. Products resulting from this effort will be clinically
developed and commercialized worldwide by Novartis.

     MERCK

     In June 1996, Merck and Cubist signed a partnership to discover novel
antibiotics targeting specific aminoacyl-tRNA synthetase enzymes. These enzymes,
which are required for protein synthesis, are essential for bacterial survival.
In the first phase of the alliance, Cubist and Merck screened certain Merck
chemical libraries to identify inhibitors of specific aminoacyl-tRNA synthetase
targets. Merck paid an up-front technology license fee and provided research
funding to us throughout the three years of the agreement.

     In October 1997, we announced the expansion of the alliance to include
additional Cubist drug targets and Merck's natural products compound library.
The expanded agreement added three Cubist synthetase targets, bringing the total
to six, and expanded the screening libraries to include Merck's collection of
natural extracts in addition to prototypical small molecules. Merck began paying
additional research support beyond the original agreement.

     In May 1998, the agreement was again expanded to enable Merck to license
Cubist compounds and data for inclusion in the collaborative research program.
It was agreed that we could contribute compounds we had discovered independently
in our internal drug discovery programs to the collaboration for further
optimization and development. Cubist could also conduct medicinal chemistry and
perform pre-clinical development of compounds active against bacterial pathogens
utilizing Merck's proprietary database mining tools and compound collection.

     In August 1999, we received an undisclosed milestone payment from Merck for
achieving a medicinal chemistry research milestone under the agreement. We also
announced that we had exclusively licensed to Merck two chemical classes of


<PAGE>
                                      -13-



novel, antiinfective compounds for a second undisclosed payment. The parties
amended the existing agreement to incorporate these compounds into the
collaboration.

     From that point on, Merck has conducted all of the medicinal chemistry
efforts, with Cubist providing technical support. Merck is funding all of the
research and clinical development efforts. Merck has exclusive, worldwide rights
to manufacture and sell compounds resulting from the collaboration and will pay
Cubist a royalty on drug sales if successfully developed.

     BIOTECHNOLOGY ALLIANCES

     To expand our access to novel small molecule libraries and other
technologies for screening, target and drug discovery, we have formed and are
currently engaged in alliances with biotechnology companies including Neurogen
Corporation, Phylos, Cetek Corporation, Coelacanth Corporation and Xenogen
Corporation.

PATENTS AND PROPRIETARY TECHNOLOGY

     We seek to protect our cloned targets, expressed proteins, assays, organic
synthetic processes, lead compounds, screening technology and other technologies
by, among other things, filing, or causing to be filed on our behalf, patent
applications. We have 22 issued U.S. patents, 35 pending U.S. patent
applications, 18 issued foreign patents and 56 pending foreign patent
applications. We have licensed, from the Massachusetts Institute of Technology,
three U.S. patents related to research technologies. We have licensed from Eli
Lilly a portfolio of eight issued U.S. patents and 17 foreign patents related to
the composition, manufacture, administration and use of daptomycin. In addition,
Eli Lilly has agreed to assign to Cubist an additional two U.S. issued patents,
62 issued foreign patents and two pending foreign patent applications. This
portfolio also covers the composition, manufacture and use of daptomycin. We
have also filed a number of patent applications in our name relating to the
composition, manufacture, administration and use of daptomycin and other
lipopeptides. We cannot be sure that patents will be granted with respect to any
of our pending patent applications or with respect to any patent applications
filed by us in the future, nor can we be sure that any of our existing patents
or any patents that may be granted to us in the future will be commercially
useful in protecting our technology.

     Our commercial success will depend in part on not infringing patents or
proprietary rights of others. We cannot be sure that we will be able to obtain a
license to any third-party technology we may require to conduct our business or
that if obtainable, such technology can be licensed at reasonable cost. Failure
by us to obtain a license to technology that we may require to utilize our
technologies or commercialize our products may have a material adverse effect on
our business, operating results and financial condition. In some cases,
litigation or other proceedings may be necessary to defend against or assert
claims of infringement, to enforce patents issued to us, to protect our trade
secrets, know-how or other intellectual property rights, or to determine the
scope and validity of the proprietary rights of third parties. Any potential
litigation could result in substantial costs to us and diversion of our
resources and could have a material adverse effect on our business, operating
results and financial condition. We cannot be sure that any of our issued or
licensed patents would ultimately be held valid and enforceable or that efforts
to defend any of our patents, trade secrets, know-how or other intellectual
property rights would be successful. An adverse outcome in any such litigation
or proceeding could affect our commercial success, subject us to significant
liabilities, require us to cease using the subject technology or require us to
license the subject technology from the third party, which license may not be
available, all of which could have a material adverse effect on our business,
operating results and financial condition.

     Much of the know-how of importance to our technology and many of our
processes are dependent upon the knowledge, experience and skills, which are not
patentable, of key scientific and technical personnel. To protect our rights to
and to maintain the confidentiality of trade secrets and proprietary
information, we require employees, advisors, consultants and collaborators to
execute confidentiality and invention assignment agreements upon commencement of
a relationship with us. These agreements prohibit the disclosure of confidential
information to anyone outside our company and require disclosure and assignment
to us of ideas, developments, discoveries and inventions made by employees,
advisors, consultants and collaborators. We cannot be sure, however, that these
agreements will not be breached or that our trade secrets or proprietary
information will not otherwise become known or developed independently by
others.


<PAGE>
                                      -14-




MANUFACTURING

     We currently engage ACS Dobfar of Italy to manufacture bulk clinical grade
daptomycin drug substance for our clinical trials. We currently obtain our
finished clinical grade vialed formulation of daptomycin from Abbott
Laboratories (Hospital Products Division) and Cook Sterile Solutions, Inc.

     In April 2000, we entered into a development and supply agreement with
Abbott Laboratories (Abbott) pursuant to which Abbott has agreed to assist
Cubist in the development of daptomycin as a parenteral formulation and to
manufacture and sell exclusively to Cubist, daptomycin as a parenteral
formulation. Under the terms of this agreement, Cubist has agreed to make
certain milestone payments to Abbott for their development efforts and
assistance in obtaining an approved New Drug Application, or an NDA, for
daptomycin. If the FDA approves the daptomycin NDA, Cubist will purchase
minimum annual quantities of drug product from Abbott over a five year period
beginning in 2002.

     In June 2000, Cubist entered into a services agreement with
Gist-brocades Holding A.G. (DSM), an affiliated company of DSM Capua pursuant
to which DSM has agreed to provide supervisory and advisory services to
Cubist relating to the equipping of the manufacturing facility at DSM Capua.
Cubist has also entered into a manufacturing and supply agreement with DSM
Capua pursuant to which DSM Capua has agreed to manufacture and supply to
Cubist bulk daptomycin drug substance for commercial purposes. Under the
terms of the manufacturing and supply agreement, DSM Capua is required to
prepare its manufacturing facility in Italy to manufacture bulk daptomycin
drug substance in accordance with Good Manufacturing Practices standards.
Under the terms of the service agreements, Cubist will make a series of
scheduled payments to DSM over a five year period beginning in 2000 in order
to reimburse DSM for certain costs to be incurred by DSM Capua in connection
with the preparation, testing and validation of its manufacturing facility.
In addition, in consideration for the implementation of the Cubist technology
in the facility by DSM Capua, Cubist has agreed to make milestone payments to
DSM if specific phases of the preparation of its manufacturing facility are
completed within specified periods of time. Cubist is accruing these
milestone payments on a quarterly basis. Upon completion of the preparation
of DSM Capua's manufacturing facility and a determination by the FDA that the
manufacturing facility complies with Good Manufacturing Practices standards,
Cubist will purchase minimum annual quantities of bulk daptomycin drug
substance from DSM over a five-year period beginning in 2002.

     We have no experience in clinical or commercial scale manufacture of
daptomycin, or any other drug. We currently rely on ACS Dobfar, Abbott and Cook
Sterile Solutions, Inc. for the manufacture of daptomycin for our clinical
trials. Commercial daptomycin and any other drugs we may commercialize will have
to be manufactured in facilities and by processes that comply with FDA and other
regulations. It may take substantial time to begin producing antimicrobial drugs
in compliance with such regulations. If we are unable to establish and maintain
compliant manufacturing facilities within a planned time frame and cost
parameters, the development and sales of our products and our financial
performance may be adversely affected.

SALES AND MARKETING

     We have the exclusive worldwide rights to commercialize daptomycin, in both
intravenous and oral formulations, and any analogs of daptomycin to which we
have intellectual property rights, and oral ceftriaxone. While it is too early
to begin developing commercialization strategies for our pre-clinical
development programs, we are evaluating various strategies for the worldwide
commercialization of Cidecin (daptomycin for injection).

     In January 2001, Cubist and Gilead Sciences jointly announced the signing
of a licensing agreement for the exclusive rights to commercialize Cidecin and
an oral formulation of daptomycin in 16 European countries following regulatory
approval. Gilead paid us an up-front licensing fee of $13 million, and we are
entitled to receive additional cash payments of up to $31 million upon
achievement of certain clinical and regulatory milestones. Gilead will also pay
us a fixed royalty on net sales. We will continue to be responsible for
worldwide clinical development of Cidecin, while Gilead will be responsible for
any regulatory filings in the covered territories. Gilead's sales force will
market the products in Europe. We will provide Cubist-employed European medical
science liaisons to support the product by providing medical education services
to infectious disease specialists and other international opinion leaders.

     We are currently investigating commercialization strategies for Cidecin in
Asia and the rest of the world. We expect to be able to announce our marketing
strategy for the U.S. in mid-2001. The strategic alternatives being considered
in the U.S. include:


<PAGE>
                                      -15-


     o    Partnering with a pharmaceutical company with an established sales
          force
     o    Partnering with a contract sales organization with an established
          sales force
     o    Partnering with a contract sales organization to establish a sales
          force
     o    Establishing a Cubist sales force

     In the U.S., it is our plan to establish a medical science liaison team of
20-30 representatives to provide medical education services to infectious
disease specialists and other opinion leaders. To this end, in February 2001, we
announced the hiring of 10 medical science liaisons. Should Cidecin gain FDA
approval, this team will form the basis for the larger educational marketing
team. Until such time, the team is leveraging its current relationships with
thought leaders in the antiinfective space to aid in the recruitment and
education of clinical trial physicians involved in the development of Cidecin.
The group is also playing a key role in the strategic direction of
Cubist--identifying antibiotic resistance and trends, initiating medical affairs
efforts, providing input on Phase IIIb/Phase IV clinical studies, guiding the
advancement of early-stage clinical candidates and assisting in the assessment
of potential product and technology acquisitions.

GOVERNMENT REGULATION

     OVERVIEW

     The development, manufacture and marketing of drugs, including antibiotics,
developed by us or our collaborative partners are subject to regulation by
numerous governmental agencies in the U.S., principally the FDA, by state and
local governments, and in some instances by foreign governments. Pursuant to the
Federal Food, Drug, and Cosmetic Act, and the regulations promulgated
thereunder, the FDA regulates the pre-clinical and clinical trials, safety,
effectiveness, manufacture, labeling, storage, record keeping, distribution, and
promotion of drugs. Product development and approval within the FDA regulatory
framework usually takes a significant number of years, involves the expenditure
of substantial capital resources and is uncertain.

     FDA PROCESS

     Before testing in the United States of any compounds with potential
therapeutic value in human subjects may begin, stringent government requirements
for pre-clinical data must be satisfied. Pre-clinical testing includes both IN
VITRO and IN VIVO laboratory evaluation and characterization of the safety and
efficacy of a drug and its formulation. Pre-clinical testing results obtained
from studies in several animal species, as well as from IN VITRO studies, are
submitted to the FDA as part of an IND (Investigational New Drug Application)
and are reviewed by the FDA prior to the commencement of human clinical trials.
These pre-clinical data must provide an adequate basis for evaluating both the
safety and the scientific rationale for the initial studies in human volunteers.
Unless the FDA objects to an IND, the IND becomes effective 30 days following
its receipt by the FDA. Once trials have commenced, the FDA may stop the trials
by placing them on "clinical hold" because of concerns about, for example, the
safety of the product being tested.

     Clinical trials involve the administration of the drug to healthy human
volunteers or to patients under the supervision of a qualified investigator,
usually a physician, pursuant to an FDA-reviewed protocol. Human clinical trials
are typically conducted in three sequential phases, although the phases may
overlap with one another. Clinical trials must be conducted under protocols that
detail the objectives of the study, the parameters to be used to monitor safety
and the efficacy criteria to be evaluated. Each protocol must be submitted to
the FDA as part of the IND. Each clinical trial must be conducted under the
auspices of an Institutional Review Board that considers, among other things,
ethical factors, the safety of human subjects, the possible liability of the
institution and the informed consent disclosure which must be made to
participants in the clinical trial.

     Phase I clinical trials represent the initial administration of the
investigational drug to a small group of healthy human subjects or, more rarely,
to a group of selected patients with the targeted disease or disorder. The goal
of Phase I clinical trials is typically to test for safety, dose tolerance,
absorption, biodistribution, metabolism, excretion and clinical pharmacology
and, if possible, to gain early evidence regarding efficacy.

     Phase II clinical trials involve a small sample of the actual intended
patient population and seek to assess the efficacy of the drug for specific
targeted indications, to determine dose response and the optimal dose range and
to gather additional information relating to safety and potential adverse
effects.


<PAGE>
                                      -16-


     Once an investigational drug is found to have some efficacy and an
acceptable safety profile in the targeted patient population, Phase III clinical
trials are initiated to establish further clinical safety and efficacy of the
investigational drug in a broader sample of the general patient population at
geographically dispersed study sites in order to determine the overall
risk-benefit ratio of the drug and to provide an adequate basis for product
labeling. The Phase III clinical development program consists of expanded,
large-scale studies of patients with the target disease or disorder, to obtain
definitive statistical evidence of the efficacy and safety of the proposed
product and dosing regimen. All of the phases of clinical studies must be
conducted in conformance with the FDA's bioresearch monitoring regulations.

     All data obtained from a comprehensive development program including
research and product development, manufacturing, pre clinical and clinical
trials and related information are submitted in an NDA to the FDA and the
corresponding agencies in other countries for review and approval. In addition
to reports of the trials conducted under the IND application, the NDA includes
information pertaining to the preparation of the new drug or antibiotic,
analytical methods, details of the manufacture of finished products and proposed
product packaging and labeling. Although the FDC Act requires the FDA to review
NDAs within 180 days of their filing, in practice, longer times may be required.
The FDA also frequently requests that additional information be submitted,
requiring significant additional review time. Any of our proposed products
likely would be subject to demanding and time-consuming NDA approval procedures
in virtually all countries where marketing of the products is intended. These
regulations define not only the form and content of safety and efficacy data
regarding the proposed product but also impose specific requirements regarding
manufacture of the product, quality assurance, packaging, storage, documentation
and record keeping, labeling, advertising and marketing procedures.

     In some cases, drug approvals may proceed under the accelerated approval or
"fast track" provisions of the Food and Drug Administration Modernization Act.
The accelerated approval provisions largely codified FDA's accelerated approval
regulations. While the statutory provisions expand upon the regulations, the FDA
continues to rely on its regulations to implement the statutory provision. The
accelerated approval regulations apply to products used in the treatment of
serious or life-threatening illnesses that appear to provide meaningful
therapeutic benefits over existing treatments. These regulations permit approval
of such products before clinical research is completed based on the product's
effect on a clinical endpoint or surrogate endpoint. When a product is approved
under the accelerated approval regulations, the sponsor may be required to
conduct additional adequate and well-controlled studies to verify that the
effect the surrogate endpoint correlates with improved clinical outcome or to
otherwise verify the clinical benefit. In the event such post-marketing studies
do not verify the drug's anticipated clinical benefit, or if there is other
evidence that the drug product is not shown to be safe and effective, expedited
withdrawal procedures permit the FDA, after a hearing, to remove a product from
the market. Significant uncertainty exists as to the extent to which these
accelerated approval regulations will result in accelerated review and approval.
The FDA retains considerable discretion to determine eligibility for accelerated
review and approval.

     OTHER REGULATORY PROCESSES

     We are also subject to regulation under other federal laws and regulation
under state and local laws, including laws relating to occupational safety,
laboratory practices, the use, handling and disposition of radioactive
materials, environmental protection and hazardous substance control. Although we
believe that our safety procedures for handling and disposing of radioactive
compounds and other hazardous materials used in our research and development
activities comply with the standards prescribed by federal, state and local
regulations, the risk of accidental contamination or injury from these materials
cannot be completely eliminated. In the event of any such accident, we could be
held liable for any damages that result and any such liability could exceed our
resources.

OUR EMPLOYEES

     As of March 26, 2001, we had 176 full-time employees, 135 of whom were
engaged in research and development and 41 of whom were engaged in
management, marketing, administration and finance. Doctorates are held by 54
of our employees. Our employees are not covered by a collective bargaining
agreement. We have never experienced an employment-related work stoppage and
we consider our employee relations to be good.

OUR FACILITIES

     We are headquartered at 24 Emily Street in Cambridge, Massachusetts, where
we lease approximately 24,000 square feet of commercial space pursuant to a term
lease that expires in September 2003, subject to a 5-year renewal option. We
have leased an additional 11,000 square feet of commercial space at 125 Sidney
Street in Cambridge, Massachusetts, pursuant to a


<PAGE>
                                      -17-



term lease that expires in December 2003. We have also leased an additional
15,000 square feet of commercial space at 148 Sidney Street in Cambridge
Massachusetts, pursuant to a term lease that expires in October 2010.

     In September 2000, we acquired a new corporate headquarters containing
88,000 square feet of commercial office and laboratory space in Lexington,
Massachusetts pursuant to a purchase and sale agreement. We plan to relocate to
the facility during the third quarter of 2001. The facilities in Lexington are
adequate for our current business requirements.

     In connection with the acquisition of TerraGen Discovery in October 2000,
we acquired the office space of former TerraGen subsidiaries in Canada and the
United Kingdom. We currently lease 9,265 square feet of commercial office and
laboratory space in Vancouver, Canada pursuant to a term lease that expires May
2001. In addition, we also lease 18,000 square feet of commercial office and
laboratory space in Slough, England pursuant to a term lease that expires in
April 2002.

LEGAL PROCEEDINGS

     We are not party to any material legal proceedings.

OUR EXECUTIVE OFFICERS AND DIRECTORS

     Our directors and executive officers and their ages as of March 30, 2001
are as follows:


<TABLE>
<S>                                 <C>     <C>
Scott M. Rocklage, Ph.D.            46      Chairman of Board of Directors and Chief Executive Officer

Dinendra "Dinu" Sen                 51      President and Chief Operating Officer

Francis P. Tally, M.D.              60      Executive Vice President, Scientific Affairs

Julian M. Davies, Ph.D.             69      Executive Vice President, Technology Development

Robert J. McCormack, Ph.D.          47       Senior Vice President, Drug Development

Alan D. Watson, Ph.D., M.B.A.       48      Senior Vice President, Corporate Development

Thomas A. Shea, M.B.A.              41      Vice President, Finance & Administration, Chief Financial
                                            Officer and Treasurer

Michael F. DeBruin, M.D.            46      Vice President, Clinical Research

Dennis D. Keith, Ph.D.              57      Vice President, Chemical Development

Frederick B. Oleson, Jr., D.Sc.     51      Vice President, Pre-Clinical Development

George H. Shimer, Jr., Ph.D.        48      Vice President, Research

Thomas J. Slater                    45      Vice President, Commercial Development

Susan Bayh                          41      Director

Barry Bloom, Ph.D.(1)               72      Director

John K. Clarke(2)                   47      Director

David W. Martin, Jr., M.D.(2)       60      Director

Walter Maupay(2)                    62      Director

Paul R. Schimmel, Ph.D.(1)          60      Director

John Zabriskie, Ph.D.(1)            61      Director
</TABLE>
- -----------------------
(1) Member of Audit Committee
(2) Member of Compensation Committee


<PAGE>
                                      -18-





     DR. ROCKLAGE was elected Chairman of the Board of Directors in March 2000.
Dr. Rocklage has served as our Chief Executive Officer and as a member of the
board of directors since July 1994. He served as our President from July 1994
until March 2001. From 1990 to 1994, Dr. Rocklage served as President and Chief
Executive Officer of Nycomed Salutar, Inc., a diagnostic imaging company. From
1992 to 1994, he also served as President and Chief Executive Officer and
Chairman of Nycomed Interventional, Inc., a medical device company. From 1986 to
1990, he served in various positions at Nycomed Salutar, Inc. and was
responsible for designing and implementing research and development programs
that resulted in three drug products in human clinical trials, including the
approved drugs Omniscan and Teslascan. Dr. Rocklage received his B.S. in
Chemistry from the University of California, Berkeley and his Ph.D. in Chemistry
from the Massachusetts Institute of Technology.

     MR. SEN has served as our President and Chief Operating Officer since March
2001. From January 2000 to December 2000, Mr. Sen served as Senior Vice
President, Sales and Marketing at Pathogenesis Corporation, which was acquired
by Chiron Corporation in October 2000. From early 1998 through 1999, Mr. Sen was
Vice President, Marketing and Sales at Schwarz Pharma. Prior to that, he held
several senior marketing positions from 1992 to 1998 at Amgen, Inc., where he
played a role in the marketing of Epogen and Neupogen, which are considered by
most to be the first successfully commercialized biotechnology products. From
1990 to 1992, Mr. Sen was a Consultant at The Alexander Group, a firm
specializing in marketing and sales effectiveness and sales force compensation.
Mr. Sen has also held a variety of marketing and finance positions at Abbott
Laboratories. Mr. Sen is a fellow of the Institute of Chartered Accountants of
England and Wales. He received his BA from the University of Delhi in India and
his Master's Degree in Management from Northwestern University's Kellogg
Graduate School of Management.

     DR. TALLY has served as our Executive Vice President, Scientific Affairs
since January 1997. From March 1995 to January 1997, he served as our Vice
President of Research and Development. From 1986 to February 1995, Dr. Tally
served as Executive Director of Infectious Disease, Molecular Biology and
Natural Products Research at the Lederle Laboratories of American
Cyanamid/American Home Products, where he was responsible for worldwide clinical
studies for piperacillin/tazobactam which was registered for sales in Europe in
1992, approved by the FDA in 1993 and marketed as Zosyn. From 1975 to 1986, he
served as Senior Physician in Infectious Disease at the New England Medical
Center and Associate Professor of Medicine at Tufts Medical Center. Dr. Tally
received his A.B. in Biology from Providence College and his M.D. from George
Washington University School of Medicine.

     DR. DAVIES was appointed Executive Vice President of Technology Development
following Cubist's October 2000 acquisition of TerraGen Discovery Inc. Dr.
Davies founded TerraGen in 1996 where he served as Chief Scientific Officer.
From 1992 to 1996, he served as Head of Microbiology and Immunology at the
University of British Columbia and was Research Director and President of Biogen
(Geneva) from 1980 to 1985. Dr. Davies has held academic positions at the
University of Wisconsin, University of Geneva and Institut Pasteur and is a past
President of the American Society of Microbiology. He is a Fellow of the Royal
Society (London) and the Royal Society of Canada and Emeritus Professor of
Microbiology and Immunology. Dr. Davies received a B.Sc. and Ph.D. in Chemistry
from the University of Nottingham.

     DR. MCCORMACK has served as our Senior Vice President of Drug Development
since March 2000. From 1997 until 2000, Dr. McCormack was Vice President,
Regulatory Affairs at Target Research Associates. Prior to that, he served as
Vice President, Regulatory Affairs from 1993 to 1997 and as Director, Regulatory
Affairs from 1987 to 1993 at Oxford Research International Corporation, a large
contract research organization. Dr. McCormack has also served in various
positions at Knoll Pharmaceuticals, Morristown Memorial Hospital and Sandoz,
Inc. During his career, Dr. McCormack has participated in gaining approval for
drugs in the CNS, cardiovascular, dermatological and oncological therapeutic
areas. He has a B.A. in Biology from William Patterson College and a Ph.D. in
Molecular Immunology from Rutgers University.

     DR. WATSON has served as our Senior Vice President, Corporate Development
since September 1999. From October 1997 to August 1999, he served as Senior Vice
President, Intellectual Property and Licensing at Nycomed Amersham plc., a
diagnostic imaging and life sciences company. From January 1995 to September
1997, he served as Senior Vice President,


<PAGE>
                                      -19-





Technology Development at Nycomed ASA. From January 1994 to June 1995, he served
as Senior Vice President, Research and Development at Nycomed Salutar, Inc.
where he also served as a Board Director. Prior to 1994, Dr. Watson served in
various senior positions at Salutar, Inc. From 1983 to 1986 while at DuPont
Pharmaceuticals, Dr. Watson invented the stroke-imaging drug Neurolite. Dr.
Watson received his B.Sc. from the University of U.S.W., Sydney, Australia; his
M.B.A. from Northeastern University; and his Ph.D. in Bioinorganic Chemistry
from the Australia National University.

     MR. SHEA has served as our Vice President, Finance and Administration and
Chief Financial Officer since December 1998. He has also served as our Treasurer
and Chief Accounting Officer since June 1996. From December 1997 to December
1998 he served as our Senior Director of Finance and Administration, and from
1993 to November 1997, as our Director of Finance and Administration. From 1987
to 1993, he served as Manager of Accounting/MIS and Budget and Financial Analyst
at ImmuLogic Pharmaceutical Corporation, a biotechnology company. Mr. Shea
received his B.S. in Accounting/Law from Babson College and his M.B.A. from
Suffolk University.

     DR. DEBRUIN has served as our Vice President, Clinical Research since
September 1999. From March 1998 to May 1999, he served as Therapeutic Area
Head-Infectious Diseases at Wyeth-Ayerst Research and Genetics Institute. From
March 1993 to February 1998, he served as Director of Clinical Development at
Genetics Institute. From 1988 to 1993, Dr. DeBruin served in various positions
at Pfizer, Inc. Dr. DeBruin was on the faculty at the University of Connecticut
School of Medicine, and was also in private practice treating infectious
diseases from 1988 to 1991. Dr. DeBruin received his B.A. from Cornell
University and his M.D. from New York Medical College.

     DR. KEITH has served as our Vice President, Chemical Development since July
2000. From October 1997 to July 2000, he served as our Vice President, Drug
Discovery. From 1971 to October 1997, Dr. Keith was with Hoffman-La Roche Inc.
where he served in various positions, including Director of Antiinfective
Chemistry, Senior Director of Medicinal Chemistry and Research Director of
Oncology. Dr. Keith received his B.S. in Chemistry from Bates College and his
Ph.D. in Organic Chemistry from Yale University.

     DR. OLESON has served as our Vice President, Pre-Clinical Development since
July 2000. From November 1997 to July 2000, he served as our Vice President,
Drug Development. Prior to joining us, Dr. Oleson was an independent consultant
from June 1997 to November 1997. From January 1997 to June 1997, Dr. Oleson
served as Director of Preclinical Research at AutoImmune, Inc., a biotechnology
company. From 1992 to January 1997, Dr. Oleson served as Director, Toxicology
and Preclinical Pharmacology at Biogen, Inc., a biotechnology company. Dr.
Oleson also held various positions at Bristol-Myers Squibb from 1983 to 1992.
Dr. Oleson was a key contributor in the development of the Biogen drug Avonex
and a key consultant in the development of Angiomax for The Medicines Company.
Dr. Oleson received his B.S. in Biochemistry from Princeton University and a
Doctor of Science in Physiology/ Radiation Biology from Harvard University
School of Public Health.

     DR. SHIMER has served as our Vice President, Research since July 2000. From
January 2000 to July 2000, he served as our Vice President, Biology. Prior to
joining us, Dr. Shimer was Senior Director, Pathogen Genomics at Genome
Therapeutics Corp. from February 1995 through January 2000. Dr. Shimer received
his B.S. in Biochemistry from North Carolina State University and his Ph.D. in
Biochemistry from Colorado State University.

     MR. SLATER has served as our Vice President, Commercial Development since
May 1999. From July 1998 to April 1999, he served as Senior Vice President of
Business Development for Newport Strategies, a consulting company. From January
1996 to June 1998, he served as Vice President, Biomaterials Business for
Genzyme Corporation, a biotechnology company. From 1988 to January 1996, Mr.
Slater served in various sales and marketing positions for Genzyme Corporation.
Prior to 1988, Mr. Slater served in marketing and sales positions for
pharmaceutical companies Hoffmann LaRoche and Upjohn. Mr. Slater received his
B.S. in Biology from Upsala College.

     MS. BAYH has served as one of our directors since June 2000. From 1994 to
present, Ms. Bayh has served as the Commissioner of the International Joint
Commission (IJC), a bi-national organization between the United States and
Canada focusing on environmental issues of the Great Lakes. Ms. Bayh served as
an attorney in Eli Lilly's Pharmaceutical Division handling federal regulatory
issues for marketing and medical clients from 1989 to 1994 and, from 1984 until
1989, Ms. Bayh practiced law, focusing on litigation, utility and corporate law,
and antitrust. She is also a director of Anthem, Inc., (a Blue Cross/Blue Shield
company), Corvas International, Inc., a biotechnology company, Emmis
Communications, and Golden State Foods. Ms. Bayh has a B.A. from the University
of California at Berkeley and a J.D. from the University of Southern California
Law Center.

<PAGE>
                                      -20-



     DR. BLOOM has served as a one of our directors since September 1993. Dr.
Bloom has more than 40 years experience in the pharmaceutical industry. From
1952 to 1993, Dr. Bloom served in various positions at Pfizer Inc., including
Executive Vice President of Research & Development. He is a director of Vertex
Pharmaceuticals, Inc. and Neurogen Corp., biotechnology companies; Microbia, a
biotechnology company; and Incyte Pharmaceuticals, Inc., a genomics company. Dr.
Bloom received his S.B. in Chemistry and his Ph.D. in Organic Chemistry from the
Massachusetts Institute of Technology.

     MR. CLARKE is one of our founders and served as Chairman of the Board of
Directors from our incorporation to March 2000. Mr. Clarke has served as one of
our directors since our incorporation. From 1992 to 1994, Mr. Clarke served as
our acting President and Chief Executive Officer. Since 1982, he has been a
general partner of DSV Management in Princeton, New Jersey, the general partner
of DSV Partners IV. He is a founder and director of Alkermes, Inc. and a
director of VISICU, Inc., Parkstone Medical Information Systems, Inc.,
MedContrax, Inc., Molecular Mining, Inc. and TechRx, Inc. Mr. Clarke is the
Managing General Partner for Cardinal Partners, founded in 1997. Mr. Clarke
received his B.A. in Biology and Economics from Harvard College and his M.B.A.
from The Wharton School of the University of Pennsylvania.

     DR. MARTIN has served as one of our directors since October 1997. Since
July 1997, Dr. Martin has served as President, Chief Executive Officer and a
founder of Eos Biotechnology, Inc. Dr. Martin was a Professor of Medicine,
Professor of Biochemistry and an Investigator of the Howard Hughes Medical
Institute at the University of California San Francisco until 1983 when he
became the first Vice President and subsequently Senior Vice President of
Research and Development at Genentech, Inc., a position he held until 1990.
He was Executive Vice President of DuPont Merck Pharmaceutical Company from
1991 through 1993 and then returned to California in 1994 where he was Senior
Vice-President of Chiron Corp., a biotechnology company, and President of
Chiron Therapeutics. In May 1995, he assumed the position of President and
Chief Executive Officer of Lynx Therapeutics, Inc., a biotechnology company,
and served until November 1996. Dr. Martin is also a Director of Varian
Medical Systems, Inc., a medical equipment and software supplier, and of
Talik, Inc., a biopharmaceutical development company.

     MR. MAUPAY has served as one of our directors since June 1999. Since 1988,
Mr. Maupay has served as President of Calgon Vestal Laboratories, a division of
Merck & Co., Inc. until January 1995, when it was sold to Bristol-Myers Squibb.
Since June 1995, Mr. Maupay has also served as Group Executive of Calgon Vestal
Laboratories after the sale to Bristol-Myers Squibb. From 1984 to 1988 Mr.
Maupay served as Vice-President, Healthcare at Calgon Vestal Laboratories. Mr.
Maupay is a director of Life Medical Sciences, Inc., a medical device company,
Kensey Nash Corporation, a medical device company, Neshaminy Golf Club, Inc. and
Warwick Golf Farm. Mr. Maupay received his Bachelor of Science in Pharmacy from
Temple University and his M.B.A. from Lehigh University.

     DR. SCHIMMEL is one of our scientific founders and has served as one of our
directors since our incorporation. From 1967 to 1998, Dr. Schimmel served as a
Professor of Biochemistry and Biophysics at the Massachusetts Institute of
Technology and as the John D. and Catherine T. MacArthur Professor of
Biochemistry and Biophysics at the Massachusetts Institute of Technology from
1992 to 1997. He has been a Professor and member of the Skaggs Institute for
Chemical Biology of the Scripps Research Institute since 1997. Dr. Schimmel is
an expert in molecular biology, protein translation and aminoacyl-tRNA
synthetases. He is a member of the National Academy of Sciences and the American
Academy of Arts and Sciences. Dr. Schimmel was a founder and is a director of
Repligen Corporation and Alkermes, Inc., each a biotechnology company. Dr.
Schimmel received his A.B. in Pre-Medicine from Ohio Wesleyan University and his
Ph.D. in Biochemistry from the Massachusetts Institute of Technology.

     DR. ZABRISKIE has served as one of our directors since June 1999. From July
1997 to July 2000, Dr. Zabriskie has served as Chairman of the Board of NEN Life
Science Products, Inc., a laboratory supply company. From July 1997 to December
1999, Dr. Zabriskie also served as President and Chief Executive Officer of NEN
Life Science Products, Inc. From November 1995 to January 1997, he was President
and Chief Executive Officer of Pharmacia & Upjohn. From 1994 to November 1995,
he served as President, Chief Executive Officer and Chairman of Upjohn Co.


<PAGE>
                                      -21-




                                  RISK FACTORS

     INVESTING IN OUR STOCK INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD CONSIDER
CAREFULLY THE RISKS DESCRIBED BELOW, TOGETHER WITH THE OTHER INFORMATION IN THIS
ANNUAL REPORT, BEFORE YOU MAKE A DECISION TO INVEST IN OUR COMMON STOCK. IF ANY
OF THE FOLLOWING RISKS ACTUALLY OCCUR, OUR BUSINESS, OPERATING RESULTS OR
FINANCIAL CONDITION COULD BE MATERIALLY ADVERSELY AFFECTED. THIS COULD CAUSE THE
MARKET PRICE OF OUR COMMON STOCK TO DECLINE, AND COULD CAUSE YOU TO LOSE ALL OR
PART OF YOUR INVESTMENT.

                         RISKS RELATING TO OUR BUSINESS

OUR OPERATING RESULTS FOR THE FORESEEABLE FUTURE WILL DEPEND SIGNIFICANTLY ON
OUR ABILITY TO OBTAIN REGULATORY APPROVAL OF, AND TO SUCCESSFULLY COMMERCIALIZE,
CIDECIN, DAPTOMYCIN FOR INJECTION.

     Cidecin is currently our only drug candidate in clinical trials. We may not
receive revenues or royalties from commercial sales of Cidecin or any other drug
in the foreseeable future, if at all.

     Our development of Cidecin involves a high degree of risk. Many important
factors affect our ability to successfully develop and commercialize Cidecin,
including our ability to:

     o    demonstrate safety and efficacy of Cidecin at each stage of the
          clinical trial process;
     o    meet applicable regulatory standards and receive required regulatory
          approvals;
     o    obtain and maintain necessary patents and licenses;
     o    produce Cidecin in commercial quantities at reasonable costs;
     o    obtain reimbursement coverage for Cidecin;
     o    compete successfully against other products; and
     o    market Cidecin successfully.

     We cannot be sure that we will successfully develop and commercialize
Cidecin or that we will obtain required regulatory approvals for its
commercialization. As a result, we may never generate revenues from Cidecin
sales.

WE HAVE INCURRED SUBSTANTIAL LOSSES IN THE PAST AND EXPECT TO INCUR ADDITIONAL
LOSSES OVER THE NEXT SEVERAL YEARS.

     Since we began operations, we have incurred substantial net losses in
every fiscal period. We had net losses of $14.4 million in 1998, $24.1
million in 1999 and $44.3 million in 2000. We had an accumulated deficit of
$108.2 million through December 31, 2000. These losses have resulted
principally from costs in conducting research and development activities,
commencing clinical trials and associated administrative costs.

     We expect to incur significant additional operating losses over the next
several years as we expand our research and development efforts, pre-clinical
testing and clinical trials and we implement manufacturing, marketing and sales
programs. As a result, we cannot predict when we will become profitable, if at
all, and if we do, we may not remain profitable for any substantial period of
time. If we fail to achieve profitability within the time frame expected by
investors, the market price of the common stock may decline.

WE MAY NOT BE ABLE TO SUCCESSFULLY INTEGRATE TERRAGEN DISCOVERY INC. AND ACHIEVE
THE BENEFITS EXPECTED TO RESULT FROM THE ACQUISITION.

     On October 23, 2000, we concluded the acquisition of TerraGen Discovery
Inc. We consummated the transaction with the expectation that it will result in
mutual benefits including, among other things, benefits relating to expanded and
complementary product offerings, increased market opportunity, new technology
and the addition of research and development personnel. Achieving the benefits
of the acquisition will depend in part on the integration of our technology,
operations and personnel in a timely and


<PAGE>
                                      -22-



efficient manner so as to minimize the risk that the merger will result in the
loss of market opportunity or key employees or the diversion of the attention of
management.

     In addition, TerraGen's principal offices are located in Vancouver, British
Columbia, Canada, with a facility in Slough, England, and our principal offices
are located in Cambridge, Massachusetts. We intend to maintain the operations of
the Canadian and English facilities. We must successfully integrate operations
and personnel in these offices with our operations and personnel in Cambridge
for the acquisition to be successful. We cannot assure you that we will
successfully integrate or manage this process. In addition, we cannot assure you
that, following the transaction, our businesses will achieve revenues, specific
net income or loss levels, efficiencies or synergies that justify the
acquisition or that the acquisition will result in increased earnings, or
reduced losses, for the combined company in any future period.

IF WE DO NOT INTEGRATE TERRAGEN'S OPERATIONS QUICKLY AND EFFECTIVELY, SOME OR
ALL OF THE POTENTIAL BENEFITS OF THE ACQUISITION MAY NOT OCCUR.

     We must make TerraGen's technology, products and services operate together
with our technologies, products and services. If we do not integrate their
operations and technologies quickly and smoothly, serious harm to the combined
company's business, financial condition and prospects may result. Integrating
the two businesses will entail significant diversion of management's time and
attention. We may be required to spend additional time or money on integration
that would otherwise be spent on developing their business and services or other
matters.

THE LOSS OF KEY TERRAGEN PERSONNEL COULD MAKE IT DIFFICULT TO COMPLETE EXISTING
PROJECTS AND UNDERTAKE NEW PROJECTS.

     The success of the combined company will depend on its ability to identify,
hire and retain employees, and a significant component of the value of the
merger is in the know-how and experience of TerraGen employees that we employ.
If key TerraGen employees were to leave, we may be unable to complete existing
TerraGen projects or to undertake new projects, each of which could materially
impair our future earnings and results of operations. We do not have employment
agreements with any of the key employees of TerraGen that provide for a fixed
term of employment.

A VARIETY OF RISKS ASSOCIATED WITH OUR INTERNATIONAL OPERATIONS COULD MATERIALLY
ADVERSELY AFFECT OUR BUSINESS.

     Because we have operations in Canada and the United Kingdom, we are subject
to additional risks related to operating in foreign countries. Our Canadian and
English operations are organized as separate legal entities. Associated risks
include:

     o    unexpected changes in tariffs, trade barriers and regulatory
          requirements;
     o    economic weakness, including inflation, or political instability in
          particular foreign economies and markets;
     o    compliance with tax, employment immigration and labor laws for
          employees living and traveling abroad;
     o    foreign taxes including withholding of payroll taxes; and
     o    foreign currency fluctuations, which could result in increased
          operating expenses and reduced revenues; and other obligations
          incident to doing business or operating a subsidiary in another
          country

     These and other risks associated with our international operations may
materially adversely affect our ability to attain or maintain profitable
operations.

WE DEPEND ON THIRD PARTIES FOR MANUFACTURING OF DAPTOMYCIN, AND OUR
COMMERCIALIZATION OF DAPTOMYCIN COULD BE STOPPED, DELAYED OR MADE LESS
PROFITABLE IF THOSE THIRD PARTIES FAIL TO PROVIDE US WITH SUFFICIENT QUANTITIES
AT ACCEPTABLE PRICES.

     We have no experience in manufacturing. We lack the facilities and
personnel to manufacture products in accordance with the Good Manufacturing
Practices prescribed by the FDA or to produce an adequate supply of compounds to
meet future requirements for clinical trials and commercialization of
daptomycin. Drug manufacturing facilities are subject to an inspection


<PAGE>
                                      -23-


before the FDA will issue an approval to market a new drug product, and all of
the manufacturers that we intend to use must adhere to the current Good
Manufacturing Practice regulations prescribed by the FDA.

     We currently depend entirely on one company, ACS Dobfar, to manufacture
bulk daptomycin drug substance for our clinical trials, and on two companies,
Abbott Laboratories (Hospital Products Division) and Cook Sterile Solutions,
Inc., to manufacture clinical grade vialed formulation of daptomycin. We have
entered into a manufacturing and supply agreement with DSM Capua to manufacture
and supply to us bulk daptomycin drug substance for commercial purposes. We have
also entered into a development and supply agreement with Abbott Laboratories to
manufacture and supply final vialed daptomycin commercial drug product.

     We may not be able to enter into definitive agreements on acceptable terms
for the expanded commercial scale manufacturing of daptomycin. If we are unable
to do so, or if we are required to transfer manufacturing processes to other
third-party manufacturers, we would be required to satisfy various regulatory
requirements and we could experience significant delays in supply. If we are
unable to maintain, develop or contract for manufacturing capabilities on
acceptable terms at any time, our ability to conduct clinical trials and to make
any commercial sales would be adversely affected.

IF WE ARE UNABLE TO DEVELOP SATISFACTORY SALES AND MARKETING CAPABILITIES, WE
MAY NOT SUCCEED IN COMMERCIALIZING CIDECIN OR ANY OTHER PRODUCT CANDIDATE.

     We have no experience in marketing and selling drug products. We have
entered into a marketing, distribution and development agreement with Gilead
Sciences, Inc. for the development and commercialization of Cidecin and oral
daptomycin in the European Community. We have not entered into other
arrangements for the sale and marketing of Cidecin or any other product in North
America. We may seek to collaborate with a third party to market our drugs or
may seek to market and sell our drugs by ourselves. If we seek to collaborate
with a third party in North America, we cannot be sure that a collaborative
agreement can be reached on terms acceptable to us. If we seek to market and
sell our drugs directly in North America, we will need to hire additional
personnel skilled in marketing and sales. We cannot be sure that we will be able
to acquire, or establish third-party relationships to provide, any or all of
these marketing and sales capabilities in North America.

EVEN IF WE OBTAIN REGULATORY APPROVALS TO COMMERCIALIZE CIDECIN OR ANY OTHER
DRUG, OUR DRUG PRODUCTS MAY NOT BE ACCEPTED BY PHYSICIANS, PATIENTS, THIRD-PARTY
PAYORS OR THE MEDICAL COMMUNITY IN GENERAL.

     We cannot be sure that Cidecin or any other drug successfully developed by
us, independently or with our collaborative partners, will be accepted by the
pharmaceutical market. Cidecin and any future products we develop will compete
with a number of antimicrobial drugs manufactured and marketed by major
pharmaceutical companies. The degree of market acceptance of any drugs we
develop depends on a number of factors, including:

     - our demonstration of the clinical efficacy and safety of our drugs;

     - the advantages and disadvantages of our drugs compared to existing
       therapies; and

     - the reimbursement policies of government and third-party payors.

     We cannot be sure that physicians, patients, third-party payors or the
medical community in general will accept and utilize any drugs we develop.

OUR APPROACH TO DRUG DISCOVERY IS UNPROVEN, AND WE MAY NOT SUCCEED IN
IDENTIFYING ANY DRUG CANDIDATES WITH CLINICAL BENEFITS.

     Our approach requires the development of multiple novel technologies to
create a successful drug candidate. While we have demonstrated that some
compounds have the ability to inhibit the activity of some molecular targets, we
have not proven that this activity can be utilized clinically as a therapeutic
drug. We cannot be certain that any preliminary potential demonstrated in
primary screening will continue to be encouraging in further screening or drug
discovery studies. We have not tested any drug candidates developed from our
drug discovery program in humans, and we cannot assure you that there will be
clinical benefits associated with any drug candidates we do develop. Our failure
to develop new drug candidates would have a material adverse effect on our
business, operating results and financial condition.


<PAGE>
                                      -24-



OUR RESEARCH AND DEVELOPMENT PROGRAM FOR DRUG PRODUCTS OTHER THAN CIDECIN IS AT
AN EARLY STAGE, AND WE CANNOT BE CERTAIN OUR PROGRAM WILL RESULT IN THE
COMMERCIALIZATION OF ANY DRUG.

     Except for our development program for Cidecin, our research and
development program is at an early stage. To date, we have not, independently or
with our collaborative partners, optimized any lead drug candidates generated in
our research program. Any drug candidates we develop will require significant
additional research and development efforts prior to commercial sale, including
extensive pre-clinical and clinical testing and regulatory approval. This may
require increases in spending on internal projects, the acquisition of third
party technologies or products and other types of investments. We cannot be sure
our approach to drug discovery, acting independently or with our collaborative
partners, will be effective or will result in the development of any drug. We
cannot expect that any drug products that do result from our research and
development efforts will be commercially available for many years.

     We have limited experience in conducting pre-clinical testing and clinical
trials. Even if we receive initially positive pre-clinical or clinical results,
those results will not mean that similar results will be obtained in the later
stages of drug development. All of our potential drug candidates are prone to
the risks of failure inherent in pharmaceutical product development, including
the possibility that none of our drug candidates will be:

     o    safe, non-toxic and effective;
     o    approved by regulatory authorities;
     o    developed into a commercially viable drug;
     o    manufactured or produced economically;
     o    successfully marketed; or
     o    accepted widely by customers.

WE FACE SIGNIFICANT COMPETITION FROM OTHER BIOTECHNOLOGY AND PHARMACEUTICAL
COMPANIES, AND OUR OPERATING RESULTS WILL SUFFER IF WE FAIL TO COMPETE
EFFECTIVELY.

     The biotechnology and pharmaceutical industries are intensely competitive.
We have many competitors both in the United States and internationally,
including major multinational pharmaceutical and chemical companies,
biotechnology companies and universities and other research institutions.
Competition for Cidecin, in particular, includes commercially available drugs
such as vancomycin, Zyvox and drug candidates in clinical development.

     Many of our competitors have greater financial and other resources, such as
larger research and development staffs and more effective marketing and
manufacturing organizations. Our competitors may succeed in developing or
licensing on an exclusive basis technologies and drugs that are more effective
or less costly than any which we are currently developing, which could render
our technology and future drug products obsolete and noncompetitive. It is
possible for our competitors to obtain FDA or other regulatory approvals for
drug candidates before we can. In general, companies that begin commercial sale
of their drugs before their competitors have a significant competitive advantage
in the marketplace, including the ability to obtain patent and FDA marketing
exclusivity rights that would delay our ability to market specific products.
Even if our drug candidates are approved for sale, we may not be able to compete
successfully with competitors' existing products or products under development.

DECISIONS BY OUR COLLABORATIVE PARTNERS COULD IMPAIR OR PROHIBIT OUR DEVELOPMENT
OF NEW PRODUCTS AND OTHERWISE ADVERSELY AFFECT OUR REVENUES.

     A key element of our strategy is to enhance our drug discovery and
development programs, and to fund a portion of our capital requirements, by
entering into collaborative agreements with pharmaceutical and biotechnology
companies. Our receipt of revenues, whether in the form of continued research
funding, drug development milestone payments or royalty payments on sales of
drugs, from these collaborative agreements is dependent upon the decisions made
by our collaborative partners. The amount and timing of resources dedicated by
our collaborative partners to their respective collaborations with us is not
under our control.


<PAGE>
                                      -25-


     Some drug candidates discovered by us may be viewed by our collaborative
partners as competitive with their drugs or drug candidates. Accordingly, our
collaborative partners may not elect to proceed with the development of drug
candidates that we believe to be promising. In addition, our collaborative
partners may pursue their existing or alternative technologies in preference to
our drug candidates. As a result:

     - the interests and goals of our collaborative partners might not always
       coincide with ours;

     - some of our collaborative partners might develop independently, or with
       others, drugs that could compete with ours; or

     - disagreements over proprietary rights might lead to delays in research or
       in the development and commercialization of product candidates and
       might result in litigation or arbitration, either of which would be
       time consuming and expensive.

     If any of our collaborative partners breaches or terminates its agreement
with us or otherwise fails to conduct its collaborative activities in a timely
manner:

     o    the development or commercialization of any drug candidate or research
          program under these collaborative agreements may be delayed;
     o    we may be required to undertake unforeseen additional responsibilities
          or to devote unforeseen additional resources to such development or
          commercialization; or
     o    the development or commercialization could be terminated.

     We cannot be sure that we will be able to establish additional
collaborative relationships on terms acceptable to us or to continue our
existing collaborative arrangements.

OUR SUCCESS DEPENDS ON OUR ABILITY TO PROTECT OUR PROPRIETARY RIGHTS.

     Our success depends to a significant degree upon our ability to obtain
United States and foreign patent protection for our drug candidates and
processes, preserve our trade secrets, and operate without infringing the
proprietary rights of third parties. Legal standards relating to the validity of
patents covering pharmaceutical and biotechnological inventions, and the scope
of claims made under such patents, are still developing. Our patent position is
highly uncertain and involves complex legal and factual questions. We cannot be
certain that the named applicants or inventors of the subject matter covered by
our patent applications or patents, whether directly owned by us or licensed to
us, were the first to invent or the first to file patent applications for such
inventions. Third parties may challenge, infringe upon, circumvent or seek to
invalidate existing or future patents owned by or licensed to us. A court or
other agency with jurisdiction may find our patents unenforceable. Even if we
have valid patents, these patents still may not provide sufficient protection
against competing products or processes.

     If our drug candidates or processes are found to infringe upon the patents
of others or are found to impermissibly utilize the intellectual property of
others, our development, manufacture and sale of our infringing drug candidates
could be severely restricted or prohibited. In this case, we may have to obtain
licenses from third parties to continue utilizing the patents or proprietary
rights of others. Obtaining these licenses may be expensive, if we are able to
obtain them at all. If we become involved in litigation involving our
intellectual property rights or the intellectual property rights of others, the
potential costs of such litigation and the potential damages that we could be
required to pay could be substantial.

     In addition to patent protection, we rely on trade secrets, proprietary
know-how, and confidentiality provisions in agreements with our collaborative
partners, employees and consultants to protect our intellectual property. We
also rely on invention assignment provisions in agreements with employees and
some consultants. It is possible that these agreements could be breached or that
we might not have adequate remedies for any such breaches. Third parties may
learn of or independently discover our trade secrets, proprietary know-how and
intellectual property, which could have a material adverse effect on our
business, financial condition and results of operations. Moreover, the laws of
foreign countries in which we market our drug products may afford little or no
effective protection of our intellectual property.


<PAGE>
                                      -26-


IF WE LOSE THE SERVICES OF SCOTT M. ROCKLAGE, PH.D., DINENDRA SEN, FRANCIS P.
TALLY, M.D., OR OTHER KEY PERSONNEL, OUR BUSINESS WILL SUFFER.

     We believe that our ability to successfully implement our business strategy
is highly dependent on our senior management and scientific team, including
Scott M. Rocklage, Ph.D., our Chairman of the Board of Directors and Chief
Executive Officer, Dinendra Sen, our President and Chief Operating Officer and
Francis P. Tally, M.D., our Executive Vice President, Scientific Affairs.
Although Dr. Rocklage has entered into an employment agreement with us, he may
terminate his employment at any time upon thirty days' written notice. No other
senior executive officer or key employee has entered into an employment
agreement with us. Losing the services of one or more of these individuals might
hinder our ability to achieve our business objectives.

WE MUST HIRE AND RETAIN QUALIFIED PERSONNEL IN A COMPETITIVE LABOR MARKET.

     Our success in large part depends upon our ability to attract, train,
motivate and retain qualified scientific personnel. Qualified personnel are in
great demand throughout the biotechnology and pharmaceutical industries, and the
competition for these employees therefore is intense. If we fail to attract and
retain qualified personnel for our scientific and technical teams, the rate at
which we can discover, develop and commercialize drugs will be limited. This
could have a material adverse effect on our business, operating results and
financial condition.

WE MAY REQUIRE ADDITIONAL FUNDS.

     We may require substantial additional funds in order to:

     o    finance our drug discovery and development programs;
     o    fund our operating expenses;
     o    pursue regulatory approvals;
     o    license or acquire additional drug candidates or technologies;
     o    develop manufacturing, marketing and sales capabilities; and
     o    prosecute and defend our intellectual property rights.

     We may seek additional funding through public or private financing or other
arrangements with collaborative partners. If we raise additional funds by
issuing equity securities, further dilution to existing stockholders may result.
In addition, as a condition to giving additional funds to us, future investors
may demand, and may be granted, rights superior to those of existing
stockholders. We cannot be sure, however, that additional financing will be
available from any of these sources or, if available, will be available on
acceptable or affordable terms.

     If adequate additional funds are not available, we may be required to
delay, reduce the scope of, or eliminate one or more of our research and
development programs. In order to obtain additional funding, we may be required
to relinquish rights to technologies or drug candidates that we would not
otherwise relinquish in order to continue independent operations.

WE COULD INCUR SUBSTANTIAL COSTS RESULTING FROM PRODUCT LIABILITY CLAIMS
RELATING TO OUR DRUG PRODUCTS.

     The nature of our business exposes us to potential liability risks inherent
in the testing, manufacturing and marketing of pharmaceutical products. Using
our drug candidates in clinical trials may expose us to product liability claims
and possible adverse publicity. These risks will expand with respect to drugs,
if any, that receive regulatory approval for commercial sale. Product liability
insurance is expensive and may not be available in the future. We cannot be sure
that we will be able to maintain or obtain insurance coverage at acceptable
costs or in a sufficient amount, that our insurer will not disclaim coverage as
to a future claim or that a product liability claim would not otherwise
adversely affect our business, operating results or financial condition.


<PAGE>
                                      -27-




OUR ABILITY TO GENERATE FUTURE REVENUES FROM DRUG PRODUCTS WILL DEPEND ON
REIMBURSEMENT AND DRUG PRICING.

     Acceptable levels of reimbursement of costs of developing and manufacturing
of drugs and treatments related to those drugs by government authorities,
private health insurers and other organizations, such as HMOs, will have an
effect on the successful commercialization of, and attracting collaborative
partners to invest in the development of, our drug candidates. We cannot be sure
that reimbursement in the United States or elsewhere will be available for any
drugs we may develop or, if already available, will not be decreased in the
future. Also, we cannot be sure that reimbursement amounts will not reduce the
demand for, or the price of, our drugs. Any reduction in demand would adversely
affect our business. If reimbursement is not available or is available only to
limited levels, we may not be able to obtain collaborative partners to
manufacture and commercialize drugs, and may not be able to obtain a
satisfactory financial return on our own manufacture and commercialization of
any future drugs.

     Third-party payors increasingly are challenging prices charged for medical
products and services. Also, the trend toward managed health care in the United
States and the concurrent growth of organizations such as HMOs, as well as
legislative proposals to reform health care or reduce government insurance
programs, may result in lower prices for pharmaceutical products, including any
products that may be offered by us in the future. Cost-cutting measures that
health care providers are instituting, and the effect of any health care reform,
could materially adversely affect our ability to sell any drugs that are
successfully developed by us and approved by regulators. Moreover, we are unable
to predict what additional legislation or regulation, if any, relating to the
health care industry or third-party coverage and reimbursement may be enacted in
the future or what effect such legislation or regulation would have on our
business.

WE MAY UNDERTAKE ADDITIONAL STRATEGIC ACQUISITIONS IN THE FUTURE AND ANY
DIFFICULTIES FROM INTEGRATING SUCH ACQUISITIONS COULD DAMAGE OUR ABILITY TO
ATTAIN OR MAINTAIN PROFITABILITY.

     We may acquire additional businesses and technologies that complement or
augment our existing business and technologies. Integrating any newly acquired
businesses or technologies could be expensive and time-consuming. We may not be
able to integrate any acquired business successfully. Moreover, we may need to
raise additional funds through public or private debt or equity financing to
acquire any businesses, which may result in dilution for stockholders and the
incurrence of indebtedness. We may not be able to operate acquired businesses
profitably or otherwise implement our growth strategy successfully.


                    RISKS RELATED TO GOVERNMENTAL APPROVALS

IF WE DO NOT OBTAIN REGULATORY APPROVALS, WE WILL NOT BE ABLE TO MARKET CIDECIN
OR ANY FUTURE DRUG CANDIDATES.

     The FDA and comparable regulatory agencies in foreign countries impose
substantial requirements upon the commercial introduction of drug products to
establish their safety and efficacy. These include lengthy and detailed
pre-clinical, laboratory and clinical testing procedures, sampling activities
and other costly and time-consuming procedures. All of our drug candidates will
require governmental approvals for commercialization, none of which have been
obtained. Pre-clinical testing and clinical trials and manufacturing of our drug
candidates will be subject to rigorous and extensive regulation by the FDA and
corresponding foreign regulatory authorities. Satisfaction of these requirements
typically takes a significant number of years and can vary substantially based
upon the type, complexity and novelty of the product.

     We are currently testing Cidecin in human clinical trials to determine
whether Cidecin is safe and effective and, if so, to what degree. Many drugs in
human clinical trials fail to demonstrate the desired safety and efficacy
characteristics. Drugs in later stages of clinical development may fail to show
the desired safety and efficacy traits despite having progressed through initial
human testing. Our failure to demonstrate the safety and efficacy of Cidecin
could delay or prevent required approvals from regulatory authorities. This
would prevent us from commercializing Cidecin and would substantially impair our
business, operating results and financial condition. We cannot be sure when we,
independently or with our collaborative partners, might submit additional drug
candidates for FDA or other regulatory review. Government regulation also
affects the manufacturing and marketing of pharmaceutical products like ours.

     The effects of governmental regulations may be to:

     o    delay the marketing of our potential drugs for a considerable or
          indefinite period of time;


<PAGE>
                                      -28-



     o    impose costly procedural requirements upon our activities; and
     o    furnish a competitive advantage to larger companies or companies more
          experienced in regulatory affairs.

     Delays in obtaining governmental regulatory approval could adversely affect
our marketing as well as our ability to generate significant revenues from
commercial sales. We cannot be sure that FDA or other regulatory approvals for
any drug candidates developed by us will be granted on a timely basis or at all.
Moreover, if regulatory approval to market a drug candidate is granted, the
approval may impose limitations on the indicated use for which the drug may be
marketed.

WE HAVE LIMITED EXPERIENCE IN CONDUCTING THE PRE-CLINICAL AND CLINICAL TESTING
NECESSARY FOR US TO OBTAIN REGULATORY APPROVALS OF OUR DRUG CANDIDATES.

     Before we receive regulatory approvals for the commercial sale of any of
our potential drugs, our drug candidates will be subject to extensive
pre-clinical testing and clinical trials to demonstrate their safety and
efficacy in humans. We depend on our collaborative partners to conduct clinical
trials for the drug candidates resulting from the collaborative agreements, and
we may become dependent on third parties to conduct future clinical trials of
our internally developed drug candidates. We have limited experience in
conducting pre-clinical testing or clinical trials. Clinical trials have been
commenced only with respect to Cidecin and not with respect to any of our other
drug candidates or any drug candidates being developed jointly by us and our
collaborative partners. Furthermore, we cannot be sure that pre-clinical testing
or clinical trials of any drug candidates will demonstrate the safety and
efficacy of our drug candidates at all or to the extent necessary to obtain
regulatory approvals. Companies in the biotechnology industry have suffered
significant setbacks in advanced clinical trials, even after demonstrating
promising results in earlier trials. The failure to demonstrate the safety and
efficacy of a drug candidate under development would delay or prevent regulatory
approval of the drug candidate and could have a material adverse effect on our
business, operating results and financial condition.

IF WE FAIL TO COMPLY WITH EXTENSIVE REGULATIONS AFTER ANY REGULATORY APPROVAL OF
A DRUG PRODUCT OR IF A REGULATORY AUTHORITY WITHDRAWS ITS APPROVAL OF A DRUG
PRODUCT, WE MAY BE FORCED TO SUSPEND THE SALE OF THE PRODUCT.

     Even if initial regulatory approvals for our drug candidates are obtained,
our company, our drugs and the manufacturing facilities for our drugs would be
subject to continual review and periodic inspection. Later discovery of
previously unknown problems with a drug, manufacturer or facility may result in
restrictions on the drug, the manufacturer or us, including withdrawal of the
drug from the market. The FDA stringently applies regulatory standards. Failure
to comply can, among other things, result in fines, denial or withdrawal of
regulatory approvals, product recalls or seizures, operating restrictions and
criminal prosecution. In addition, our manufacturing facilities will be subject
to FDA inspections for adherence to Good Manufacturing Practices prior to
marketing clearance and periodically during the manufacturing process. The FDA
may also require post-marketing testing and surveillance to monitor the effects
of an approved product. In addition, if there are any modifications to a drug,
further regulatory approval will be required.


ITEM 2. DESCRIPTION OF PROPERTY

     We are headquartered at 24 Emily Street in Cambridge, Massachusetts, where
we lease approximately 24,000 square feet of commercial space pursuant to a term
lease that expires in September 2003, subject to a 5-year renewal option. We
have leased an additional 11,000 square feet of commercial space at 125 Sidney
Street in Cambridge, Massachusetts, pursuant to a term lease that expires in
December 2003. We have also leased an additional 15,000 square feet of
commercial space at 148 Sidney Street in Cambridge Massachusetts, pursuant to a
term lease that expires in October 2010.

     In September 2000, we acquired a new corporate headquarters containing
88,000 square feet of commercial office and laboratory space in Lexington,
Massachusetts pursuant to a purchase and sale agreement. We plan to relocate to
the facility during the third quarter of 2001. The facilities in Lexington are
adequate for our current business requirements.

     In connection with the acquisition of TerraGen Discovery in October 2000,
we acquired the office space of former TerraGen subsidiaries in Canada and the
United Kingdom. We currently lease 9,265 square feet of commercial office and
laboratory space in Vancouver, Canada pursuant to a term lease that expires in
May 2001. In addition, we also lease 18,000 square feet of commercial office and
laboratory space in Slough, England pursuant to a term lease that expires in
April 2002.

<PAGE>
                                      -29-


ITEM 3. LEGAL PROCEEDINGS

     We are not party to any material legal proceedings.


ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

     No matters were submitted to a vote of security holders during the last
quarter of the fiscal year ended December 31, 2000.

                                     PART II

ITEM 5. MARKET FOR REGISTRANTS' COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

MARKET INFORMATION

     Cubist's common stock is traded on the Nasdaq National Market under the
symbol "CBST". The following table sets forth, for the period indicated, the
high and low sale prices per share of Cubist's common stock as reported by the
Nasdaq National Market.

<TABLE>
<CAPTION>
                                                                 PRICE RANGE OF
                                                                 COMMON STOCK
                                                               -------------------
                                                               HIGH          LOW
                                                               ----          ---
<S>                                                           <C>          <C>
Year Ended December 31, 1999:
         First Quarter.......................................  $ 4.87       $ 2.68
         Second Quarter......................................  $ 4.87       $ 2.87
         Third Quarter.......................................  $ 11.12      $ 2.93
         Fourth Quarter......................................  $ 21.50      $ 7.37

Year Ended December 31, 2000:
         First Quarter.......................................  $ 71.50      $16.25
         Second Quarter......................................  $ 52.50      $16.87
         Third Quarter.......................................  $ 64.12      $41.00
         Fourth Quarter......................................  $ 52.12      $22.68

Year Ended December 31, 2001:
         First Quarter (through March 23, 2001) .............  $ 35.93      $12.00
</TABLE>


HOLDERS

     As of March 23, 2001, Cubist had 277 stockholders of record. This does not
reflect persons or entities who hold their stock in nominee or "street" name
through various brokerage firms.

DIVIDENDS

     We have never declared or paid cash dividends on our capital stock and do
not anticipate paying any dividends in the foreseeable future. We currently
intend to retain future earnings, if any, to operate and expand our business.
Our payment of any future dividends will be at the discretion of our board of
directors after taking into account various factors, including our financial
condition, operating results, cash needs and growth plans. Our bank term loan
contains a restrictive covenant that prohibits us from paying cash dividends or
making stock redemptions or repurchases without the prior written consent of the
lender bank.


<PAGE>
                                      -30-


RECENT SALES OF UNREGISTERED SECURITIES

     Described below is information regarding all securities we sold during the
fiscal year ended December 31, 2000, which, unless otherwise noted below, were
not registered under the Securities Act.

     In January 2000, we issued and sold an aggregate of 2,200,000 shares of
common stock at a purchase price of $25.00 per share. The issuance and sale of
such shares of common stock were made in reliance on Rule 506 of Regulation D
promulgated under Section 4(2) of the Securities Act. The resale of these shares
was subsequently registered with the SEC.

     In September 2000, in connection with the purchase of our new headquarters
in Lexington, Massachusetts, we issued senior convertible promissory notes in
favor of entities affiliated with John Hancock Life Insurance Company in the
aggregate principal amount of $39 million. The notes are convertible into shares
of Cubist common stock.

     In October 2000, in connection with the acquisition of TerraGen Discovery
Inc., we issued an aggregate of 495,584 shares of common stock to acquire the
fully diluted capitalization of TerraGen. The issuance and sale of such shares
of common stock were made in reliance on Section 3(a)(10) of the Securities Act
and Rule 506 of Regulation D promulgated under Section 4(2) of the Securities
Act. The resale of these shares was subsequently registered with the SEC.

ITEM 6. SELECTED FINANCIAL DATA

     The selected financial data are presented below for the years ended
December 31 1998, 1999 and 2000 and Statement of Operations for 1997 are
derived from our audited consolidated financial statements. The selected data
for the year ended December 31, 1996 and the balance sheet information as of
December 31, 1996 and 1997 has been prepared by us to reflect the combination
of Cubist with TerraGen using the pooling-of-interests method of accounting
and is unaudited. The following selected financial information should be read
in conjunction with "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and the consolidated financial
statements and the notes thereto, included elsewhere in this report.

<TABLE>
<CAPTION>
                                                          YEAR ENDED DECEMBER 31,
                                                         -----------------------
                                             1996      1997       1998       1999        2000
                                             ----      ----       ----       ----        ----
                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                       <C>        <C>       <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Sponsored research revenues...........     $5,022     $2,767     $1,674     $6,846     $5,223

Operating expenses:
   Research and development expenses..      7,459     10,799     12,357     25,539     44,638
   General and administrative
      expenses........................      2,116      3,618      4,451      6,397     12,113

        Total operating expenses......      9,575     14,417     16,808     31,936     56,751
Interest income.......................        315      1,098        931        905      8,464
Interest expense......................      (229)       (244)      (361)    (1,059)    (2,314)
Other income..........................         --      1,833         (1)       197        578

Income tax benefit related to
   Canadian operations................         --         --        175        925        499
   Net loss...........................    $(4,467)   $(8,963)  $(14,390)  $(24,122)  $(44,301)
Basic and diluted net loss per
   common share.......................    $ (1.72)   $ (0.89)  $  (1.16)  $  (1.31)  $  (1.68)
Weighted average number of common
   shares outstanding for basic and
   diluted net loss per common share..      2,595     10,115     12,395     18,456     26,415
</TABLE>

<TABLE>
<CAPTION>
                                                          YEAR ENDED DECEMBER 31,
                                                         -----------------------
                                             1996      1997       1998       1999        2000
                                             ----      ----       ----       ----        ----
                                                                 (IN THOUSANDS)
<S>                                       <C>        <C>       <C>        <C>        <C>
BALANCE SHEET DATA:
Cash, cash equivalents and
investments.......................         19,506    20,197      21,327     26,829    139,783
Working capital...................         18,033    10,238      16,046     21,938    110,146
Total assets......................         23,898    24,384      26,178     42,595    193,370
Long-term liabilities.............          1,062     1,366       1,523      6,392     46,075
Stockholders' equity..............         20,516    21,345      22,658     29,441    133,020
Dividends.........................             --        --          --         --         --
</TABLE>



<PAGE>
                                      -31-




ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

     THE FOLLOWING DISCUSSION SHOULD BE READ IN CONJUNCTION WITH OUR FINANCIAL
STATEMENTS AND RELATED NOTES APPEARING ELSEWHERE IN THIS ANNUAL REPORT. THE
FOLLOWING DISCUSSION CONTAINS FORWARD-LOOKING STATEMENTS. OUR ACTUAL RESULTS MAY
DIFFER SIGNIFICANTLY FROM THOSE PROJECTED IN THE FORWARD-LOOKING STATEMENTS.
FACTORS THAT MIGHT CAUSE FUTURE RESULTS TO DIFFER MATERIALLY FROM THOSE
PROJECTED IN THE FORWARD-LOOKING STATEMENTS INCLUDE, BUT ARE NOT LIMITED TO,
THOSE DISCUSSED IN "RISK FACTORS" AND ELSEWHERE IN THIS ANNUAL REPORT. ALSO, SEE
"SPECIAL NOTE ON FORWARD-LOOKING STATEMENTS AND INDUSTRY DATA."

OVERVIEW

     Since our incorporation on May 1, 1992 and commencement of operations in
February 1993, we have been engaged in the research, development and
commercialization of novel antimicrobial drugs to combat serious and
life-threatening bacterial and fungal infections, including those caused by
bacteria and fungi resistant to commercially available drugs. We have a limited
history of operations and have experienced significant net losses since
inception. We had an accumulated deficit of $108.2 million through December 31,
2000. We expect to incur significant additional operating losses over the next
several years and expect cumulative losses to increase due to expanded research
and development efforts, pre-clinical testing and clinical trials and the
development of manufacturing, marketing and sales capabilities.

     On October 23, 2000, C&T Acquisition Corporation, a subsidiary of Cubist,
acquired TerraGen Discovery Inc., ("TerraGen") a natural products discovery
company with operations in Vancouver, Canada and Slough, England. Following the
acquisition, the name of TerraGen was changed to Cubist Pharmaceuticals Inc.
TerraGen conducts its Slough, England operations through a wholly owned
subsidiary. With the acquisition, we acquired proprietary technologies and
expertise in the area of small molecule drug discovery from natural products.
Pursuant to the acquisition, we indirectly through C&T Acquisition Corporation
acquired all of the issued and outstanding common and preferred shares of
TerraGen, and assumed all of the outstanding options, warrants and convertible
debentures of TerraGen, by issuing 334,933 shares of our common stock and
causing C&T Acquisition Corporation to issue 178,491 exchangeable shares. The
exchangeable shares are exchangeable at any time at the option of the holder, on
a one-for-one basis, subject to certain adjustments, for shares of our common
stock. All exchangeable shares that remain outstanding will be automatically
exchanged for shares of our common stock on October 23, 2002. The options,
warrants and convertible debentures of TerraGen assumed by us pursuant to the
acquisition are exercisable or convertible for 94,605 shares of our common
stock. This acquisition had been accounted for using the pooling-of-interests
method of accounting. This Management's Discussion and Analysis of Financial
Condition and Results of Operations and the accompanying Consolidated Financial
Statements of Cubist have been restated to include the results and balances of
C&T Acquisition Corporation and TerraGen and its subsidiaries for all periods
presented.

     In recent years we have enhanced our drug discovery and development
programs and funded a portion of our capital requirements by entering into
collaborative agreements with pharmaceutical and biotechnology companies. We
have entered into collaborative agreements based specifically on our
aminoacyl-tRNA synthetase program with Merck and Bristol-Myers Squibb, and a
collaborative agreement with Novartis based on our VITA functional genomics
technology. Under these collaborative agreements, we have received sponsored
research payments and, if drug development milestones are achieved, we are
entitled to milestone payments. In addition, we will be entitled to receive
royalties on worldwide sales of any drug developed and commercialized from these
collaborations. We have received all of the sponsored research payments that we
were entitled to under our collaborative agreements with Merck and
Bristol-Meyers Squibb, although Merck and Bristol-Myers Squibb are still
required to make milestone payments and pay royalties to us for any drug
developed and commercialized from these collaborations.

     On November 7, 1997, we entered into a license agreement with Eli Lilly and
Company, pursuant to which we acquired exclusive worldwide rights to develop,
manufacture and market daptomycin. In exchange for such license, we paid to Eli
Lilly an upfront license fee in cash, and if drug development milestones are
achieved, have agreed to pay milestone payments in cash or by issuing shares of
our common stock to Eli Lilly. In addition, we will be required to pay royalties
to Eli Lilly on worldwide sales of Cidecin. On February 19, 1999, we issued to
Eli Lilly 56,948 shares of our common stock as a milestone payment which was due
upon commencement of Phase III clinical trials of Cidecin. The value of the
common stock issued was $250,000 and was recorded as research and development
expense. On October 6, 2000, we entered into a restated assignment and license
agreement whereby we will obtain expanded rights under the Eli Lilly patents
including an exclusive license to make, use and sell daptomycin for use in the
field of infectious disease no longer excluding induced colitis and complete
ownership, control and all rights to other Eli Lilly Assigned Patents relating
to daptomycin subject matter claimed therein for all compounds and all uses.


<PAGE>
                                      -32-



     In September 1998, our Canadian subsidiary entered into a research
collaboration agreement with Schering-Plough Research Institute to access our
recombinant library to discover novel leads with potential activity in the
anti-infective area. As part of the agreement, we would provide library
screening services to Schering-Plough for those strains provided. In exchange
for these services, Schering-Plough is making rsearch payments to us.
Schering-Plough was granted an exclusive, worldwide license to use any
recombinant microorganism that produces a lead and an exclusive, worldwide
license to all of its rights and ownership in any resulting patents.

     In May 1999, our Canadian subsidiary entered into a second collaboration
agreement with Schering-Plough under which Schering-Plough was granted an
exclusive, worldwide license to manufacture and sell compounds resulting from
screening Cubist's natural product library. In exchange for the license,
Schering-Plough is making research payments and, if scientific and
development milestones are achieved, Schering-Plough will make milestone
payments to us. In addition, Schering-Plough will be required to pay
royalties to us on worldwide sales of any drug developed and commercialized
from any products derived from this collaboration.

     On February 3, 1999, we entered into a collaborative research and license
agreement with Novartis Pharma AG to use our VITA functional genomics technology
to validate and develop assays for antimicrobial targets and to identify new
compounds for development as antimicrobial agents. In exchange for the license,
Novartis is making research payments and, if scientific and development
milestones are achieved, Novartis will make milestone payments to us. In
addition, Novartis will be required to pay royalties to us on worldwide sales of
any drug developed and commercialized from any products derived from this
collaboration. Upon the signing of the research and license agreement, Novartis
purchased, and we issued to Novartis, 797,448 shares of our common stock for a
total purchase price of $4.0 million in cash.

     On March 17, 1999, our Canadian subsidiary purchased the assets of
ChromaXome Corporation for $5.7 million, excluding acquisition costs, by
paying $2 million in cash, issuing notes payable of approximately $3 million
and issuing 18,231 shares of our common stock. The acquisition was accounted
for using the purchase method of accounting with the results of operations
included in our financial statements from the date of acquisition.

     On April 8, 1999, our Canadian subsidiary purchased the assets of Xenova
Discovery Ltd. for $5.2 million, excluding acquisition costs, by paying
$400,000 in cash, issuing notes payable of approximately $3.6 million and
issuing 30,386 shares of our common stock. The acquisition was accounted for
using the purchase method of accounting with the results of operations
included in our financial statements from the date of acquisition.

     On November 18, 1999, our Canadian subsidiary entered into a
cross-license agreement with Diversa Corporation. Under the terms of the
agreement, we granted a co-exclusive world-wide non-royalty bearing license
to certain patented technology, subject to certain restrictions. The license
may not be sublicensed and Diversa cannot use the macrodroplet screening
technology for the term of the agreement. Under the agreement, Diversa paid
an upfront license fee of $2,500,000 and will pay annual license maintenance
fees of $100,000 beginning in 2000, until the patents expire. We are required
to repay the license fee if we merge or are acquired prior to November 18,
2004 by a company whose primary business is DNA shuffling.

     On December 1, 1999, we entered into a Clinical Services Master
Agreement with Omnicare Clinical Research, Inc. f/k/a IBAH, Inc. pursuant to
which Omnicare has agreed to provide various clinical research services for
our Cidecin clinical trials, including bacteremia; resistant, refractory or
contraindicated; complicated skin and soft tissue; complicated urinary tract;
and community acquired pneumonia. The related costs are being accrued over
the life of the clinical trials.

     On January 10, 2000, we entered into a Monitoring Services Agreement with
Clindev (Proprietary) Limited, pursuant to which Clindev has agreed to provide
monitoring services for our Cidecin international complicated skin and soft
tissue trial. Under the terms of this agreement, the specific responsibilities
and obligations to be performed by Clindev include study management, clinical
trial initiation and management and clinical data management. The related costs
are being accrued over the life of the clinical trial.

     On August 1, 2000, we entered into a Contract Research Agreement with
Target Research Associates, Inc. pursuant to which Target has agreed to provide
various clinical research services for our Cidecin Community Acquired Pneumonia
trial. Under the terms of this agreement, the specific responsibilities and
obligations to be performed by Target include study management, clinical trial
initiation and management and clinical data management. The related costs are
being accrued over the life of the clinical trial.

     In April 2000, we entered into a development and supply agreement with
Abbott Laboratories pursuant to which Abbott has agreed to assist us in the
development of daptomycin as a parenteral formulation and to manufacture and
sell exclusively to us, daptomycin as a parenteral formulation. Under the
terms of this agreement, we agreed to make certain milestone payments to
Abbott for their development efforts and assistance in obtaining an approved
New Drug Application, or NDA, for daptomycin. We made payments totalling
$325,000 during the year ended December 31, 2000 which were expensed as
research and development. If the FDA approves the daptomycin NDA, we will
purchase minimum annual quantities of drug product from Abbott over a five
year period beginning in 2002.

<PAGE>
                                      -33-


     In June 2000, Cubist entered into a services agreement with
Gist-brocades Holding A.G. (DSM), an affiliated company of DSM Capua pursuant
to which DSM has agreed to provide supervisory and advisory services to
Cubist relating to the equipping of the manufacturing facility at DSM Capua.
Cubist has also entered into a manufacturing and supply agreement with DSM
Capua pursuant to which DSM Capua has agreed to manufacture and supply to
Cubist bulk daptomycin drug substance for commercial purposes. Under the
terms of the manufacturing and supply agreement, DSM Capua is required to
prepare its manufacturing facility in Italy to manufacture bulk daptomycin
drug substance in accordance with Good Manufacturing Practices standards.
Under the terms of the service agreements, Cubist will make a series of
scheduled payments to DSM over a five year period beginning in 2000 in order
to reimburse DSM for certain costs to be incurred by DSM Capua of
approximately $7.5 million in connection with the preparation, testing and
validation of its manufacturing facility. During 2000, Cubist reimbursed
$750,000 of these costs to DSM Capua and accrued an additional $846,000.
These costs are being recorded as other assets and will begin to be amortized
upon completion of the facility and commencement of manufacturing daptomycin
for commercial purposes. In addition, in consideration for the implementation
of the Cubist technology in the facility by DSM Capua, Cubist has agreed to
make milestone payments of $1,400,000 to DSM if specific phases of the
preparation of its manufacturing facility are completed within specified
periods of time. Cubist is accruing these estimated milestone payments over
the expected duration of the preparation work and recorded research and
development expense of $627,000 in 2000. Upon completion of the preparation
of DSM Capua's manufacturing facility and a determination by the FDA that the
manufacturing facility complies with Good Manufacturing Practices standards,
Cubist will purchase minimum annual quantities of bulk daptomycin drug
substance from DSM over a five-year period beginning in 2002.

     On September 8, 2000, we announced the purchase of a new corporate
headquarters building in Lexington, Massachusetts. The new facility is 88,000
square feet, approximately 35,000 of which is constructed as laboratory
space. We believe this should increase our operating efficiencies to better
meet our corporate goals and objectives and plans to relocate to the
facilities in the third quarter of 2001. To finance the purchase, we issued
$39 million of convertible notes to John Hancock Life Insurance Company. This
financing covers the building purchase price of approximately $34 million and
includes $5 million for facility improvements. The five-year notes carry a
coupon rate of 8.5% and can be converted at any time at the option of the
holder into our common stock at $63.8625 per share. We retain the right to
redeem these notes after three years at 103% of its principal amount
outstanding.

RESULTS OF OPERATIONS

YEARS ENDED DECEMBER 31, 2000 AND 1999

     REVENUES. Total revenues in the year ended December 31, 2000 were
$5,223,000 compared to $6,846,000 in the year ended December 31, 1999, a
decrease of $1,623,000 or 23.7%. The revenues earned in the year ended
December 31, 2000, consisted of $4,775,000 in research support funding from
the Novartis, Schering-Plough and other strategic collaborations and $448,000
in Small Business Innovation Research funding. The revenues earned in the
year ended December 31, 1999 consisted of $6,535,000 in research support
funding from the Bristol-Myers Squibb, Merck, Schering-Plough, Novartis and
other strategic collaborations and $311,000 in Small Business Innovation
Research funding. The decrease in revenues in the year ended December 31,
2000 as compared to the year ended December 31, 1999 was primarily due to the
completion of research support funding phases of the Merck and Bristol-Myers
Squibb collaborations, partially offset by increased funding from SBIR grants
and revenues associated with the Schering-Plough collaboration.

     RESEARCH AND DEVELOPMENT EXPENSES. Total research and development expenses
in the year ended December 31, 2000, were $44,638,000 compared to $24,786,000 in
the year ended December 31, 1999, an increase of $19,852,000 or 80.1%. The
increase was largely due to increased clinical and manufacturing costs related
to Cidecin development, including the additional personnel costs and purchases
that were required by such development.

     WRITE-OFF OF ACQUIRED IN-PROCESS RESEARCH AND DEVELOPMENT EXPENSES. We
incurred a write-off of acquired in-process research and development costs in
the year ended December 31, 1999 of $752,000 relating to the acquisitions of
ChromaXome and Xenova in 1999.

     GENERAL AND ADMINISTRATIVE EXPENSES. General and administrative expenses in
the year ended December 31, 2000, were $12,113,000 compared to $6,397,000 in the
year ended December 31, 1999, an increase of $5,716,000 or 89.4%. The increase
was largely due to increased personnel costs and recruiting expenses, increased
costs associated with our marketing program, as well as increased legal and
other professional services costs that were expensed under pooling of interests
accounting treatment related to the acquisition of TerraGen.

     INTEREST INCOME AND EXPENSE. Interest income in the year ended December 31,
2000, was $8,464,000 compared to $905,000 in the year ended December 31, 1999,
an increase of $7,559,000 or 835.2%. The increase in interest income was due
primarily to higher average cash, cash equivalent and investment balances during
the year ended December 31, 2000 as a result of the private


<PAGE>
                                      -34-




placement financings and secondary public offering completed during 2000.
Interest expense in the year ended December 31, 2000 was $2,314,000 as compared
to $1,059,000 during the year ended December 31, 1999, an increase of $1,255,000
or 118.5%. The increase in interest expense was primarily due to the convertible
debt financing of the new corporate headquarters building in Lexington,
Massachusetts.

     OTHER INCOME. Other income in the year ended December 31, 2000 was $579,000
compared to $197,000 in the year ended December 31, 1999, an increase of
$382,000 or 193.9%. The increase in other income was due to foreign currency
gains and losses related to our subsidiaries in Canada and the United Kingdom.

     INCOME TAX BENEFIT. Income tax benefit in the year ended December 31,
2000, was $499,000 compared to $926,000 in the year ended December 31, 1999,
a decrease of $427,000 or 46.1%. The decrease in income tax benefit was due
to the decreased availability of investment tax credits related to our
Canadian operations during the year ended December 31, 2000.

     NET LOSS. Our net loss for the year ended December 31, 2000 was $44,301,000
compared to $24,122,000 during the year ended December 31, 1999, an increase of
$20,179,000 or 83.7%. The increase was primarily due to an increase in expenses
incurred associated with the development of Cidecin, increased costs associated
with our marketing program, increased costs related to personnel and recruiting
expenses and increased legal and other professional services costs that were
expensed under pooling of interests accounting treatment related to the
acquisition of TerraGen.

YEARS ENDED DECEMBER 31, 1999 AND 1998

     REVENUES. Total revenues in the year ended December 31, 1999 were
$6,846,000 compared to $1,674,000 in the year ended December 31, 1998, an
increase of $5,172,000 or 309.0%. The revenues earned in the year ended
December 31, 1999, consisted of $6,535,000 in research support funding from
the Bristol-Myers Squibb, Merck, Novartis and other strategic collaborations
and $311,000 in Small Business Innovation Research funding. The revenues
earned in the year ended December 31, 1998 consisted of $1,146,000 in
research support funding from the Bristol-Myers Squibb, Merck and other
strategic collaborations and $528,000 in Small Business Innovation Research
funding. The increase in revenues in the year ended December 31, 1999 as
compared to the year ended December 31, 1998 was primarily due to the
increase of milestone payments and research support funding from the Merck,
Novartis and other strategic collaborations during 1999.

     RESEARCH AND DEVELOPMENT EXPENSES. Total research and development expenses
in the year ended December 31, 1999, were $24,786,000 compared to $12,357,000 in
the year ended December 31, 1998, an increase of $12,429,000 or 100.6%. The
increase was largely due to increased clinical and manufacturing costs related
to Cidecin development, the additional personnel and purchases that were
required by such development and the expanded research and development
activities after the acquisitions of ChromaXome and Xenova which were accounted
for under the purchase method of accounting.

     WRITE-OFF OF ACQUIRED IN-PROCESS RESEARCH AND DEVELOPMENT EXPENSES. The
write-off of acquired in-process research and development costs in the year
ended December 31, 1999 of $752,000 related to the acquisitions of ChromaXome
and Xenova in 1999.

     GENERAL AND ADMINISTRATIVE EXPENSES. General and administrative expenses in
the year ended December 31, 1999, were $6,397,000 compared to $4,452,000 in the
year ended December 31, 1998, an increase of $1,945,000 or 43.7%. The increase
was largely due to increased investor and public relations expenses, increased
legal and other professional services expenses and expanded activities after the
acquisitions of ChromaXome and Xenova which were accounted for under the
purchase method of accounting.

     INTEREST INCOME AND EXPENSE. Interest income in the year ended December 31,
1999, was $905,000 compared to $931,000 in the year ended December 31, 1998, a
decrease of $26,000 or 2.8%. The decrease in interest income was due primarily
to lower average cash, cash equivalent and investment balances during the year
ended December 31, 1999 as compared to the year ended December 31, 1998.
Interest expense in the year ended December 31, 1999 was $1,059,000 as compared
to $361,000 during the year ended December 31, 1998, an increase of $698,000 or
193.4%. The increase in interest expense was primarily due to the debt financing
of the ChromaXome and Xenova acquisitions and deemed discounts related to
convertible debentures.

     OTHER INCOME. Other income in the year ended December 31, 1999 was
$197,000 compared to ($1,000) in the year ended December 31, 1998, an
increase of $198,000. The increase in other income was due to foreign
currency gains and losses related to our subsidiaries in Canada and the
United Kingdom.

<PAGE>
                                      -35-




     INCOME TAX BENEFIT. Income tax benefit in the year ended December 31, 1999,
was $926,000 compared to $175,000 in year ended December 31, 1998, an increase
of $751,000 or 429.1%. The increase in income tax benefit was due to investment
tax credits for increased research and development expenditures related to our
Canadian operations during the year ended December 31, 1999 as compared to the
year ended December 31, 1998.

     NET LOSS. Our net loss for the year ended December 31, 1999 was $24,122,000
compared to $14,390,000 during the year ended December 31, 1998, an increase of
$9,732,000 or 67.6%. The increase was primarily due to an increase in expenses
incurred associated with the development of Cidecin, increased costs associated
with our marketing and investor relations program and the expanded operations
after the acquisitions of ChromaXome and Xenova, which were accounted for under
the purchase method of accounting.

LIQUIDITY AND CAPITAL RESOURCES

     Since inception, we have financed our operations through the sale of equity
securities, convertible debt securities, equipment financing, sponsored research
revenues, license revenues and interest earned on invested capital. Our total
cash, cash equivalent and investments balance at December 31, 2000 was
$139,783,000 compared to $26,829,000 at December 31, 1999.

     From inception through December 31, 2000, we had invested an aggregate of
$47,106,000 (of which $37,032,000 was invested during 2000) in property and
equipment, primarily in building, leasehold improvements and laboratory
equipment under capital leases. The obligations under capital leases at December
31, 2000 were $934,000. Minimum annual principal payments due under capital
leases total $696,000 in 2001. Principal payments are scheduled to decline each
year thereafter until expiration in 2003. We made principal payments under our
capital lease obligations of $685,000 in the year ended December 31, 2000. We
expect our capital expenditures in 2001 to be approximately $13,000,000,
consisting of leasehold improvements, laboratory equipment and information
technology purchases.

     On September 23, 1998, we completed a private placement financing with
investors and raised net proceeds of $12.7 million by issuing 6,065,560
shares of our common stock at $2.25 per share, along with 3,032,783 warrants
exercisable for our common stock at $2.25 per share. During the twelve months
ended December 31, 1999, we issued 285,644 shares of our common stock upon
the exercise of 326,668 warrants issued in connection with the private
placement financing completed on September 23, 1998. Such warrants are
exercisable at $2.25 per share or pursuant to a standard cashless net issue
provision. Of the 285,644 shares issued, 160,000 shares were issued for an
aggregate purchase price of $360,000 and 125,644 shares were issued upon
cashless net issue exercise pursuant to which the holders of such warrants
surrendered the right to acquire 41,024 additional shares of our common
stock. During the twelve months ended December 31, 2000, we issued 1,219,540
shares of our common stock upon the exercise of 1,261,669 warrants issued in
connection with the private placement financing completed on September 23,
1998. Such warrants were exercisable at $2.25 per share or pursuant to a
standard cashless net issue provision. Of the 1,219,540 shares issued,
650,558 shares were issued for an aggregate purchase price of $1,463,756 and
568,982 shares were issued upon cashless net issue exercise pursuant to which
the holders of such warrants surrendered the right to acquire 42,129
additional shares of our stock.

     On October 8, 1998, our Canadian subsidiary completed a private placement
financing with investors and raised net proceeds of $3.2 million by issuing
88,848 shares of our common stock, along with warrants exercisable for 44,424
shares of our common stock.

     On March 15, 1999, our Canadian subsidiary completed a private placement
financing with investors and raised net proceeds of $5.2 million by issuing
142,157 shares of our common stock.

     Upon the signing of the research and license agreement with Novartis in
February 1999, we issued to Novartis, 797,448 shares of our common stock for a
total purchase price of $4.0 million in cash.

     On March 17, 1999, our Canadian subsidiary purchased the assets of
ChromaXome Corporation for $5.7 million, excluding acquisition costs, by paying
approximately $2 million in cash, issuing notes payable of approximately $3
million and issuing 18,231 shares of our common stock.

     On April 8, 1999, our Canadian subsidiary purchased the assets of Xenova
Discovery Ltd. for $5.2 million, excluding acquisition costs, by paying
approximately $400,000 in cash, issuing notes payable of approximately $3.6
million and issuing 30,386 shares of our common stock.

     During March 1999, we entered into a term loan agreement with a bank under
which we are able to borrow up to $1,500,000 to finance fixed asset purchases.
In March 2000, we increased the term loan by an additional $2,000,000 to finance


<PAGE>
                                      -36-



leasehold improvements and fixed asset purchases. Advances under this facility
are to be repaid over a 36-month period, commencing on March 31, 2000. Interest
on the borrowings is at the bank's LIBOR rate (9.03% at December 31, 2000).
Borrowings under the facility are collateralized by all capital equipment
purchased with the funds under this term loan. At December 31, 2000, borrowings
outstanding totaled $1,139,578.

     On October 21, 1999, we completed a private placement financing with
investors and raised net proceeds of $17.5 million by issuing 2,503,333 shares
of our common stock at $7.50 per share.

     On November 16, 1999, our Canadian subsidiary issued $1.6 million Cdn of
convertible debentures and warrants to purchase 16,458 shares of common stock.
The convertible debentures bear interest at a rate of 12% and are payable on
March 31, 2000. On March 31, 2000, the convertible debentures and related
interest were converted to 30,176 shares of common stock.

     On January 17, 2000, our Canadian subsidiary issued a note payable totaling
$2,006,667 and warrants to purchase 22,790 shares of common stock. The note
payable bears interest at 14.4% and is repayable over 36 months to January 17,
2003. The warrants were exercised in 2000 resulting in gross proceeds of
$599,000. At December 31, 2000, the note payable balance was $1,062,079.

     On January 29, 2000, we completed a private placement financing with
investors and raised net proceeds of $52.0 million by issuing 2,200,000 shares
of our common stock at $25.00 per share.

     On April 3, 2000, we completed a secondary public offering and raised
approximately $82.5 million (less financing costs of $4,957,275) by issuing
2,500,000 shares of common stock at $33.00 per share. In addition, on May 3,
2000, the underwriters exercised their option to purchase an additional 375,000
shares of common stock at $33.00 per share to cover over-allotments, raising an
additional $12.4 million (less financing costs of $680,625).

     On September 8, 2000, we announced the purchase of a new corporate
headquarters building in Lexington, Massachusetts. The new facility is 88,000
square feet, approximately 35,000 of which is constructed as laboratory
space. To finance the purchase, we issued $39 million of convertible notes to
John Hancock Life Insurance Company. This financing covers the building
purchase price of approximately $34 million and includes $5 million for
facility improvements. The notes carry a coupon rate of 8.5% and can be
converted at any time at the option of the holder into our common stock at
$63.8625 per share. We retain the right to redeem these notes after three
years at 103% of the principal outstanding.

     We believe that our existing cash resources, existing capital resources,
projected interest income and future revenues due under our collaborative
agreements, will be sufficient to fund our operating expenses and capital
requirements as currently planned through at least the next 12 months. Our
actual cash requirements may vary materially from those now planned and will
depend on numerous factors. We cannot be sure that our existing cash, cash
equivalents, other capital resources, interest income and future revenues due
under our collaborative agreements will be sufficient to fund our operating
expenses and capital requirements during that period.

RECENT PRONOUNCEMENTS

     In June 1998, the Financial Accounting Standards Board issued Statement
of Financial Accounting Standards ("SFAS") No. 133 "Accounting for Derivative
Instruments and Hedging Activities," which was amended by SFAS No. 137 and is
effective for fiscal years beginning after June 15, 2000. The statement
establishes accounting and reporting standards requiring that every
derivative instrument be recorded in the balance sheet as either an asset or
liability measured at its fair value. SFAS No. 133 also requires that changes
in the derivative's fair value be recognized currently in earnings unless
specific hedge accounting criteria are met. Adoption of this standard is not
expected to have a material impact on our financial position or results of
operations.

<PAGE>
                                      -37-




ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     We currently own financial instruments that are sensitive to market risks
as part of our investment portfolio. Our investment portfolio is used to
preserve our capital until it is required to fund operations, including our
research and development activities. None of these market-risk sensitive
instruments are held for trading purposes. Our investment portfolio includes
investment grade debt instruments. These bonds are subject to interest rate
risk, and could decline in value if interest rates fluctuate. Due to the
conservative nature of these instruments, we do not believe that we have a
material exposure to interest rate risk. We do not own derivative financial
instruments in our investment portfolio.

     The following discussion about our market risk disclosures involves
forward-looking statements. Actual results could differ materially from those
projected in the forward-looking statements. We are exposed to the impact of
interest rate changes and foreign currency fluctuations.

INTEREST RATE RISK

     We do not engage in trading market risk sensitive instruments or
purchasing hedging instruments or "other than trading" instruments that are
likely to expose us to market risk, whether interest rate, foreign currency
exchange, commodity price or equity price risk. We have not purchased options
or entered into swaps, forward or futures contracts. Our primary market risk
exposure is that of interest rate risk on borrowings under our credit
facility, which are subject to interest rates based on the bank's base rate.
We also have an outstanding promissory note issued in favor of Xenova
Discovery Limited at the LIBOR rate plus one percent and a change in the
applicable interest rate on these loans would affect the rate at which we
could borrow funds. The aggregate hypothetical loss in earnings for one year
of those borrowings held by us at December 31, 2000, which are subject to
interest rate risk resulting from a hypothetical 10 percent increase in
interest rates is approximately $38,177 after tax. The hypothetical loss was
determined by financial instruments held by us at December 31, 2000. Fixed
rate financial instruments were not evaluated.

FOREIGN CURRENCY RISK

     We face exposure to adverse movements in foreign currency exchange
rates. Our international revenues and expenses are denominated in foreign
currencies. The functional currency of each of our foreign subsidiaries is
the local currency. Our international business is subject to risks typical of
an international business, including, but not limited to differing tax
structures, other regulations and restrictions, and foreign exchange rate
volatility. Based on our overall currency rate exposure at December 31, 2000,
A 10% change in foreign exchange rates would have had an immaterial effect on
our financial position, results of operations and cash flows. To date, we
have not hedged the risks associated with foreign exchange exposure. Although
we may do so in the future, we cannot be sure that any hedging techniques we
may implement will be successful or that our business, results of operations,
financial condition and cash flows will not be materially adversely affected
by exchange rate fluctuations.

<PAGE>
                                      -38-





ITEM 8.  FINANCIAL STATEMENTS

                          CUBIST PHARMACEUTICALS, INC.
                          INDEX TO FINANCIAL STATEMENTS

<TABLE>
<S>                                                                                                              <C>
Report of Independent Accountants..........................................................................      39
Balance Sheets as of December 31, 1999 and 2000............................................................      41
Consolidated Statements of Operations for the years ended December 31, 1998, 1999 and 2000.................      42
Consolidated Statements of Cash Flows for the years ended December 31, 1998, 1999 and 2000.................      43
Consolidated Statements of Changes in Stockholders' Equity and Comprehensive Loss for the
  years ended December 31, 1998, 1999 and 2000.............................................................      44
Notes to Financial Statements..............................................................................      46
</TABLE>



<PAGE>
                                      -39-




REPORTS OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Stockholders of Cubist Pharmaceuticals, Inc.:

     In our opinion, based upon our audits and the report of other auditors,
the accompanying consolidated balance sheets and the related consolidated
statements of operations, of changes in stockholders' equity and
comprehensive loss and of cash flows present fairly, in all material
respects, the financial position of Cubist Pharmaceuticals, Inc. and its
subsidiaries (the "Company") at December 31, 1999 and 2000, and the results
of their operations and their cash flows for each of the three years in the
period ended December 31, 2000, in conformity with accounting principles
generally accepted in the United States of America. These consolidated
financial statements are the responsibility of the Company's management; our
responsibility is to express an opinion on these consolidated financial
statements based on our audits. We did not audit the financial statements of
Cubist Pharmaceuticals Inc. (formerly TerraGen Discovery Inc.), a wholly
owned subsidiary, at December 31, 1999 and for each of the years ended
December 31, 1998 and 1999, which statements reflect total assets
constituting 29.1% of consolidated total assets as of December 31, 1999, and
total revenue constituting 2.4% and 21.8% of consolidated total revenue for
the years ended December 31, 1998 and 1999, respectively. Those statements
were audited by other auditors whose report thereon have been furnished to
us, and our opinion expressed herein, insofar as it relates to the amounts
included for Cubist Pharmaceuticals Inc. (formerly TerraGen Discovery Inc.),
is based solely on the report of the other auditors. We conducted our audits
of these statements in accordance with auditing standards generally accepted
in the United States of America, which require that we plan and perform the
audit to obtain reasonable assurance about whether the financial statements
are free of material misstatement. An audit includes examining, on a test
basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant
estimates made by management, and evaluating the overall financial statement
presentation. We believe that our audits and the reports of other auditors
provide a reasonable basis for the opinion expressed above.

/s/ PricewaterhouseCoopers LLP


Boston, Massachusetts
February 15, 2001



<PAGE>
                                      -40-





INDEPENDENT AUDITORS' REPORT

To the Board of Directors
Cubist Pharmaceuticals Inc.
(formerly TerraGen Discovery Inc.)


We have audited the consolidated balance sheet of Cubist Pharmaceuticals
Inc.(formerly TerraGen Discovery Inc.) (the "Company") as at December 31,
1999 and the consolidated statements of operations, stockholders' equity and
comprehensive income and cash flows for the years ended December 31, 1999 and
1998. These consolidated financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
consolidated financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States of America. Those standards require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.

In our opinion, these consolidated financial statements present fairly, in
all material respects, the financial position of the Company as at December
31, 1999 and the results of its operations and cash flows for the years ended
December 31, 1999 and 1998, in conformity with accounting principles
generally accepted in the United States of America.

Chartered Accountants

/s/ KPMG LLP

Vancouver, Canada

April 3, 2000, except as to
  the acquisition of the Company described in
  note A which is as of October 23, 2000


<PAGE>
                                      -41-



CUBIST PHARMACEUTICALS, INC.
 CONSOLIDATED BALANCE SHEETS
<TABLE>
<CAPTION>
                                                                                DECEMBER 31,
                                                                                ------------
                                                                          1999               2000
                                                                          ----               ----
<S>                                                                  <C>                 <C>
                                     ASSETS
 Current assets:
    Cash and cash equivalents....................................     $12,248,607        $46,940,277
    Short-term investments.......................................      14,580,515         74,607,683
    Accounts receivable..........................................         380,107            363,412
    Investment tax credits receivable............................         926,699                 --
    Prepaid expenses and other current assets....................         564,324          2,509,766
                                                                      -----------        -----------

   Total current assets.........................................       28,700,252        124,421,138

Property and equipment, net.....................................        4,520,051         40,142,080
Intangible assets, net..........................................        9,195,153          7,280,062
Long-term investments...........................................               --         18,234,857
Other assets....................................................          179,287          3,291,713
                                                                      -----------       ------------

   Total assets.................................................      $42,594,743       $193,369,850
                                                                      ===========       ============

                      LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
   Accounts payable.............................................       $1,771,995         $4,541,988
   Accrued expenses.............................................        1,778,853          7,424,576
   Current portion of long-term debt............................        2,490,231          1,692,340
   Current portion of capital lease obligations.................          720,807            615,880
                                                                       ----------         ----------

   Total current liabilities....................................        6,761,886         14,274,784
Deferred revenue................................................        2,533,875          2,500,000
Long-term debt, net of current portion..........................        2,951,864         43,257,329
Capital lease obligations, net of current portion...............          906,079            317,973
                                                                       ----------         ----------

   Total liabilities............................................       13,153,704         60,350,086
Commitments (Notes H, I, M, N and Q)
Stockholders' equity:
   Preferred  stock,  non-cumulative;  convertible,
     $.001 par value;  authorized  5,000,000
     shares 1999 and 2000; issued and outstanding
     1999 and 2000 no shares....................................               --                 --
   Common stock, $.001 par value;  authorized
     50,000,000 shares; issued and outstanding 1999
     20,983,510  shares; issued and outstanding
     2000 27,757,900 shares.....................................           20,984             27,758
   Additional paid-in capital...................................       93,050,133        241,010,543
   Accumulated deficit..........................................      (63,881,456)      (108,182,032)
   Accumulated other comprehensive income.......................          251,378            163,495
                                                                     ------------      -------------

   Total stockholders' equity...................................       29,441,039        133,019,764
                                                                      -----------      -------------

     Total liabilities and stockholders' equity.................      $42,594,743       $193,369,850
                                                                    =============       ============
</TABLE>

   The accompanying notes are an integral part of the consolidated financial
                                  statements.


<PAGE>
                                      -42-




CUBIST PHARMACEUTICALS, INC.
 CONSOLIDATED STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                                               FOR THE YEARS ENDED DECEMBER 31,
                                                                               --------------------------------
                                                                           1998             1999             2000
                                                                           ----             ----             ----
<S>                                                                     <C>           <C>               <C>
Revenue...........................................................      $1,674,152       $6,846,384       $5,223,009
Operating expenses:
   Research and development.......................................      12,356,766       24,786,363       44,638,151
   Write-off of acquired in process research and development......              --          752,304               --
   General and administrative.....................................       4,451,620        6,397,268       12,112,736
                                                                      -------------     ------------    -------------
      Total operating expenses....................................      16,808,386       31,935,935       56,750,887
Interest income...................................................         931,345          904,647        8,464,211
Interest expense..................................................        (361,124)      (1,059,134)      (2,314,225)
Other income (expense)............................................          (1,080)         196,584          578,622
                                                                     --------------   --------------    -------------
   Net loss before income taxes...................................    $(14,565,093)    $(25,047,454)    $(44,799,270)
Income tax benefit related to Canadian operations.................         175,497          925,593          498,694
                                                                     --------------   --------------    -------------
   Net loss ......................................................    ($14,389,596)    ($24,121,861)    ($44,300,576)
                                                                     ==============   ==============    =============
Basic and diluted net loss per common share.......................          $(1.16)          $(1.31)          $(1.68)
                                                                     --------------   --------------    -------------
Weighted average number of common shares outstanding
   for basic and diluted net loss per common share................      12,395,003       18,455,568       26,414,826
                                                                     ==============   ==============    =============
</TABLE>





   The accompanying notes are an integral part of the consolidated financial
                                  statements.




<PAGE>
                                      -43-





CUBIST PHARMACEUTICALS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
<TABLE>
<CAPTION>
                                                                                   FOR THE YEARS ENDED DECEMBER 31,
                                                                      ---------------------------------------------
                                                                          1998            1999            2000
                                                                          ----            ----            ----
<S>                                                                 <C>             <C>             <C>
Cash flows for operating activities:
   Net loss.......................................................    $(14,389,596)   $(24,121,861)   $(44,300,576)
   Adjustments to reconcile net loss to net cash used in
   operating activities:
   Write-off of acquired in-process research and development......              --         752,304              --
   Depreciation and amortization..................................       1,370,939       3,112,976       4,367,510
   (Gain) loss on the sale of equipment...........................              --           7,776          (8,600)
   Common stock issued for technology milestone...................              --         250,000              --
   Cashless exercise of warrants related to lease agreements......              --          38,330              --
   Fair value of options granted to non-employees.................          44,844          58,202          48,054
   Forgiveness of note receivable related to common stock.........              --              --         168,750
   Deemed discount amortization on convertible debentures.........              --         372,300         353,400
   Unrealized foreign exchange gain, net..........................              --        (209,456)       (571,208)
   Changes in assets and liabilities:
      Accounts receivable.........................................         (40,540)       (201,724)         11,945
      Investment tax credits receivable...........................        (169,348)       (757,351)        925,600
      Prepaid expenses and other current assets...................         (94,674)       (296,594)     (1,686,028)
      Other assets................................................         106,056        (105,049)     (2,129,298)
      Accounts payable and accrued expenses.......................         344,282       2,141,412       8,424,131
      Deferred revenue............................................              --       2,477,626              --
                                                                      -------------   -------------   -------------

        Total adjustments.........................................       1,561,559       7,640,752       9,904,256
                                                                      -------------   -------------   -------------

     Net cash used for operating activities.......................     (12,828,037)    (16,481,109)    (34,396,320)

Cash flows for (from) investing activities:
   Acquisitions, net of cash on hand..............................              --      (3,062,788)             --
   Purchases of property and equipment............................      (2,161,938)       (899,688)    (36,886,604)
   Proceeds from the sale of equipment............................              --          15,150           8,600
   Purchase of intangible assets..................................         (59,822)       (131,679)       (185,332)
   Purchases of investments.......................................     (12,547,850)    (15,192,711)   (110,706,986)
   Maturities of investments......................................      15,278,730      13,160,046      32,444,961
                                                                      -------------   -------------   -------------

     Net cash provided by (used for) investing activities.........         509,120      (6,111,670)   (115,325,361)
                                                                      -------------   -------------   -------------
Cash flows from financing activities:
   Issuance of common stock and warrants, net.....................      16,017,627      27,575,740     145,256,184
   Proceeds from notes receivable.................................          30,000         101,686              --
   Repayments of long-term debt...................................        (189,736)     (3,293,587)     (1,761,207)
   Proceeds from long term debt, net..............................         941,255       2,232,261      41,526,157
   Principal payments of capital lease obligations................        (582,710)       (712,464)       (684,832)
                                                                      -------------   -------------   -------------

     Net cash provided by financing activities....................      16,216,436      25,903,636     184,336,302
                                                                      -------------   -------------   -------------

Net increase in cash and cash equivalents.........................       3,897,519       3,310,857      34,614,621
Effect of changes in foreign exchange rates on cash balances......         (36,663)        158,644          77,049
Cash and cash equivalents at beginning of year....................       4,918,250       8,779,106      12,248,607
                                                                      -------------   -------------   -------------

Cash and cash equivalents at end of year..........................      $8,779,106     $12,248,607     $46,940,277
                                                                      =============   =============   =============
 Disclosures of cash flow information:
   Cash paid during the year for interest.........................        $361,124        $816,897      $2,314,225

 Non-cash investing and financing activities:
   Cancellation of promissory note in connection
     with resignation of officer..................................         $37,776              --              --
   Issuance of restricted common stock in exchange for a
   promissory note................................................              --        $506,250              --
   Issuance of notes payable related to acquisitions..............              --      $6,632,757              --
   Issuance of common stock related to acquisitions...............              --      $1,814,166              --
   Beneficial conversion feature on convertible debenture.........              --        $264,300              --
   Warrants issued with long-term debt............................              --        $323,000        $658,606
   Issuance of common stock on conversion of long-term debt.......              --              --       1,112,097
</TABLE>

       The accompanying notes are an integral part of the consolidated financial
                                    statements.

<PAGE>
                                      -44-




CUBIST PHARMACEUTICALS, INC.
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
AND COMPREHENSIVE LOSS
FOR THE YEARS ENDED DECEMBER 31, 1998, 1999 AND 2000


<TABLE>
<CAPTION>
                                                                         $ ADDITIONAL PAID-IN CAPITAL
                                                # OF                   ISSUANCE                                     $
                                                SHARES      $          OF         NOTES         DEFERRED        ACCUMULATED
                                                COMMON      COMMON     SHARES     RECEIVABLE    COMPENSATION    DEFICIT
                                                ------      ------     --------   ----------    ------------    -----------
<S>                                           <C>           <C>       <C>          <C>           <C>             <C>
BALANCE AT DECEMBER 31, 1997                  10,730,707    $10,731   $46,576,910  ($191,685)    ($35,827)       ($25,369,999)

Exercise of stock options                          3,642         4         4,465          -             -                 -
Shares issued in connection
  with employee stock purchase plan                6,341         6        20,553          -             -                 -
Repurchase of common stock                        (2,064)       (2)         (786)         -             -                 -
Issuance of common stock, net of
  offering costs                               6,183,720     6,183    16,021,767          -             -                 -
Amortization of deferred compensation                  -         -         2,255     22,223       (11,158)                -
Repayment of promissory notes                          -         -             -     30,000             -                 -
Cancellation of promissory note in
  connection with resignation of
  officer                                        (10,000)      (10)      (37,766)    37,776             -                 -
Options granted to non-employees                       -         -        44,844          -             -                 -
Net loss                                               -         -             -          -             -       (14,389,596)
Foreign currency translation                           -         -             -          -             -                 -
adjustments
                                              ----------    ------    ----------   ---------    ----------      -----------

BALANCE AT DECEMBER 31, 1998                  16,912,346    16,912    62,632,242   (101,686)      (46,985)      (39,759,595)

Exercise of stock options and warrants           432,626       433       810,983          -             -                 -
Shares issued in connection with employee
  stock purchase plan and 401(k) plan             40,035        40       144,644          -             -                 -
Issuance of common stock, net of
  offering costs                               3,549,886     3,550    27,410,670   (506,250)            -                 -
Issuance of common stock in connection
  with acquisitions, net of offering costs        48,617        49     1,814,117          -             -                 -
Issuance of warrants for services                      -         -        77,107          -       (77,107)                -
Deferred compensation related to grant
 of stock options                                      -         -       707,797          -      (703,125)                -
Amortization of deferred compensation                  -         -             -          -       140,538                 -
Repayment of promissory notes                          -         -             -    101,686             -                 -
Options granted to non-employees                       -         -        58,202          -             -                 -
Warrants issued in connection with long-
  term debt                                            -         -       323,000          -             -                 -
Beneficial conversion feature on                       -         -       264,300          -             -                 -
  convertible debentures
Net loss                                               -         -             -          -             -       (24,121,861)
Foreign currency translation adjustments               -         -             -          -             -                 -
                                              ----------    ------    ----------   ---------    ----------      -----------

BALANCE AT DECEMBER 31, 1999                  20,983,510    20,984    94,243,062   (506,250)     (686,679)      (63,881,456)

Exercise of stock options and warrants         1,641,448     1,641     3,610,538          -             -                 -
Shares issued in connection with employee
  stock purchase plan and 401(k) plan             27,766        28       624,033          -             -                 -
Issuance of common stock, net of
  offering costs                               5,075,000     5,075   141,014,869          -             -                 -
</TABLE>



<TABLE>
<CAPTION>
                                             $
                                             ACC.OTHER         $               $
                                             COMPREHENSIVE     STOCKHOLDERS    COMPREHENSIVE
                                             INCOME            EQUITY          LOSS
                                             --------------    ------------    -------------
<S>                                          <C>             <C>              <C>
BALANCE AT DECEMBER 31, 1997                   ($44,350)       $20,945,780      ($9,006,717)

Exercise of stock options                             -              4,469                -
Shares issued in connection
  with employee stock purchase plan                   -             20,559                -
Repurchase of common stock                            -               (788)               -
Issuance of common stock, net of
  offering costs                                      -         16,027,950                -
Amortization of deferred compensation                 -             13,320                -
Repayment of promissory notes                         -             30,000                -
Cancellation of promissory note in
  connection with resignation of
  officer                                             -                  -                -
Options granted to non-employees                      -             44,844                -
Net loss                                              -        (14,389,596)     (14,389,596)
Foreign currency translation
adjustments                                     (38,949)           (38,949)         (38,949)
                                               --------        -----------      -----------

BALANCE AT DECEMBER 31, 1998                    (83,299)        22,657,589      (14,428,545)
                                               ========        ===========      ===========
Exercise of stock options and warrants                -            811,416                -
Shares issued in connection with employee
  stock purchase plan and 401(k) plan                 -            144,684                -
Issuance of common stock, net of
  offering costs                                      -         26,907,970                -
Issuance of common stock in connection
  with acquisitions, net of offering costs            -          1,814,166                -
Issuance of warrants for services                     -                  -                -
Deferred compensation related to grant
 of stock options                                     -              4,672                -
Amortization of deferred compensation                 -            140,538                -
Repayment of promissory notes                         -            101,686                -
Options granted to non-employees                      -             58,202                -
Warrants issued in connection with long-
  term debt                                           -            323,000                -
Beneficial conversion feature on                      -            264,300                -
  convertible debentures
Net loss                                              -        (24,121,861)     (24,121,861)
Foreign currency translation adjustments        334,677            334,677          334,677
                                               --------        -----------      -----------

BALANCE AT DECEMBER 31, 1999                    251,378         29,441,039      (23,787,184)
                                               ========        ===========      ===========
Exercise of stock options and warrants                -          3,612,179                -
Shares issued in connection with employee
  stock purchase plan and 401(k) plan                 -            624,061                -
Issuance of common stock, net of                                                          -
  offering costs                                      -        141,019,944

</TABLE>


<PAGE>
                                      -45-


<TABLE>
<CAPTION>
                                                                         $ ADDITIONAL PAID-IN CAPITAL
                                                # OF                   ISSUANCE                                        $
                                                SHARES      $          OF            NOTES         DEFERRED        ACCUMULATED
                                                COMMON      COMMON     SHARES        RECEIVABLE    COMPENSATION    DEFICIT
                                                ------      ------     --------      ----------    ------------    -----------
<S>                                         <C>            <C>      <C>             <C>           <C>             <C>

Issuance of common stock upon
  conversion of convertible debentures           30,176         30      1,112,067            -              -                -
Deferred compensation related to grant                -          -                           -                               -
  of stock options                                                      2,115,437                  (2,115,437)
Amortization of deferred compensation                 -          -              -            -        723,493                -
Stock options cancelled                                                   (43,838)                     43,838
Forgiveness of promissory notes                       -          -              -      168,750              -                -
Options granted to non-employees                      -          -         48,054            -              -                -
Warrants issued in connection with
  long-term debt                                      -          -        658,606            -              -                -
Net loss                                              -          -              -            -              -      (44,300,576)
Foreign currency translation adjustments              -          -              -            -              -                -
                                             ----------    -------   ------------    -----------  ------------   -------------
BALANCE AT DECEMBER 31, 2000                 27,757,900    $27,758   $243,382,828    ($337,500)   ($2,034,785)   ($108,182,032)
                                             ==========    =======   ============    =========    ===========    =============
</TABLE>



<TABLE>
<CAPTION>
                                           $
                                           ACC. OTHER       $               $
                                           COMPREHENSIVE    STOCKHOLDERS    COMPREHENSIVE
                                           INCOME           EQUITY          LOSS
                                           -------------    ------------    -------------
<S>                                       <C>              <C>             <C>
Issuance of common stock upon
  conversion of convertible debentures              -         1,112,097                 -
Deferred compensation related to grant              -
  of stock options                                                    -                 -
Amortization of deferred compensation               -           723,493                 -
Stock options cancelled                                               -
Forgiveness of promissory notes                     -           168,750                 -
Options granted to non-employees                    -            48,054                 -
Warrants issued in connection with
  long-term debt                                    -           658,606                 -
Net loss                                                    (44,300,576)      (44,300,576)
Foreign currency translation adjustments      (87,883)          (87,883)          (87,883)
                                             ---------     ------------      ------------

BALANCE AT DECEMBER 31, 2000                 $163,495      $133,019,764      ($44,388,459)
                                             ========      ============      ============
</TABLE>

       The accompanying notes are an integral part of the consolidated financial
                                   statements.



<PAGE>
                                      -46-


CUBIST PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


A. NATURE OF BUSINESS

     Cubist Pharmaceuticals, Inc. ("Cubist") is a specialty pharmaceutical
company founded in May 1992 and is focused on the research, development and
commercialization of novel antimicrobial drugs to combat serious and
life-threatening bacterial and fungal infections. Cubist has established
multiple technology licenses and collaborations and has established a network of
advisors and collaborators. Cubist is headquartered in Cambridge, Massachusetts.

     On October 23, 2000, C&T Acquisition Corporation, a subsidiary of Cubist,
acquired TerraGen Discovery Inc., ("TerraGen") a natural products discovery
company with operations in Vancouver, Canada and Slough, England. Following the
acquisition, the name of TerraGen was changed to Cubist Pharmaceuticals Inc.
TerraGen conducts its Slough, England operations through a wholly owned
subsidiary. With the acquisition, Cubist acquired proprietary technologies and
expertise in the area of small molecule drug discovery from natural products.
This transaction was accounted for using the pooling-of-interests method of
accounting. The accompanying consolidated financial statements of Cubist have
been restated to include the results and balances of C&T Acquisition Corporation
and TerraGen and its subsidiaries for all periods presented.

     Cubist is subject to risks common to companies in the industry including,
but not limited to, uncertainty of product development and commercialization,
lack of marketing and sales history, dependence on key personnel, market
acceptance of products, product liability, protection of proprietary technology,
ability to raise additional financing, and compliance with FDA and other
governmental regulations.

     Cubist has a limited history of operations and has experienced significant
net losses since inception. At December 31, 2000, Cubist has an accumulated
deficit of $108.2 million. Cubist expects to incur significant additional net
losses over the next several years and expects cumulative losses to increase due
to expanded research and development efforts, preclinical testing and clinical
trials and the development of manufacturing, marketing and sales capabilities.
As a result, Cubist's business plan indicates that additional financing may be
required to support its planned expenditures. Cubist believes that the funds
currently available and future revenues due under its collaborative agreements
(Note H) will be sufficient to fund operations through at least the next twelve
months.


B. ACCOUNTING POLICIES

BASIS OF PRESENTATION AND CONSOLIDATION

     The accompanying consolidated financial statements include the accounts of
Cubist and its wholly-owned subsidiaries. All significant intercompany amounts
and transactions have been eliminated.

USE OF ESTIMATES

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make certain estimates and
assumptions that affect the reported amounts of assets and liabilities, and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the reported
period. Actual results could differ from those estimates.

CASH AND CASH EQUIVALENTS

     Cash equivalents consist of short-term interest-bearing instruments with
original maturities of three months or less. These investments are carried at
cost which approximates market value.

     Cubist invests its cash and cash equivalents primarily in deposits, U.S.
Government treasuries and money market funds with financial institutions. Cubist
has not recorded any losses to date on its invested cash and cash equivalents.


<PAGE>
                                      -47-


INVESTMENTS

     Investments, with an original maturity of more than three months when
purchased, consisted of certificates of deposit and investment-grade commercial
paper at December 31, 1999 and 2000. Investments, all of which are held to
maturity, are stated at amortized cost plus accrued interest, which approximates
market value.

PROPERTY AND EQUIPMENT

     Property and equipment are recorded at cost. Depreciation is provided using
the straight-line method over the estimated useful lives of the related assets,
generally three years for computer equipment and five years for laboratory
equipment and furniture and fixtures. Leasehold improvements are stated at cost
and are amortized over the lesser of the life of the lease or their estimated
useful lives. Maintenance and repairs are charged to expense as incurred, while
major betterments are capitalized. When assets are retired or otherwise disposed
of, the assets and related allowances for depreciation and amortization are
eliminated from the accounts and any resulting gain or loss is reflected in
income.

INTANGIBLE ASSETS

     Intellectual property and processes represents information databases, and
technological process information acquired through Cubist's business
acquisitions. These assets are amortized on a straight-line basis over their
estimated useful life of four years. Workforce represents the estimated cost
savings or value of experienced employees obtained through acquisitions and are
amortized on a straight-line basis over two years. Patent costs include costs of
obtaining patents directly or through an acquisition transaction. Patent costs
are amortized over the lesser of the patent's remaining legal life and its
useful life. Amortization of intangible assets are included in research and
development expense.

IMPAIRMENT OF LONG-LIVED ASSETS

     Cubist reviews long-lived assets for impairment whenever events or changes
in business circumstances indicate that the carrying amount of the assets may
not be fully recoverable or that the useful lives of these assets are no longer
appropriate. Each impairment test is based on a comparison of the undiscounted
cash flows to the recorded value of the asset. If impairment is indicated, the
asset is written down by the amount in which the carrying value of the asset
exceeds the related fair value of the asset. No provisions for impairment have
been recorded to date.

REVENUE RECOGNITION

     Cubist has entered into various collaborative agreements with
pharmaceutical and biotechnology companies. The terms of the collaborative
arrangements can include nonrefundable licensing fees, funding of research and
development, payments based on the achievement of certain milestones, and
royalties on product sales. Nonrefundable licensing fees are recorded as
deferred revenue upon receipt and recognized as revenue ratably over the period
that the related products or services are delivered or obligations as defined in
the agreement are performed. Revenues from research funding are recognized when
the related research activities are performed. Revenues from milestone payments
which are substantive and whose achievability was not reasonably assured at the
inception of the agreement are recognized when the milestone is achieved.
However, milestone payments that require future performance are deferred and
recognized as revenue ratably over the term of the agreement as the related
activities are performed. Any revenue related to royalties is recognized as
earned.

     Cubist's revenue recognition policies are consistent with the principles
provided in the Securities and Exchange Commission's Staff Accounting
Bulletin 101, "Revenue Recognition in Financial Statements."

     Revenue from Small Business Innovation Research ("SBIR") government grants
to conduct research and development is recognized as eligible costs are incurred
up to the funding limit.

RESEARCH AND DEVELOPMENT

     All research and development costs are expensed as incurred. The portion of
purchase price, if any, on any acquisition allocated to in-process research and
development is charged to expense upon acquisition (Note C).


<PAGE>
                                      -48-



INCOME TAXES

     Cubist accounts for income taxes under the asset and liability method.
Under this method, deferred tax assets and liabilities are recognized for the
estimated future tax consequences attributable to differences between the
financial statement carrying amounts of existing assets and liabilities and
their respective tax bases. Deferred tax assets and liabilities are measured
using enacted rates in effect for the year in which those temporary differences
are expected to be recovered or settled. A deferred tax asset is established for
the expected future benefit of net operating loss and credit carryforwards. A
valuation reserve against net deferred tax assets is required if, based upon
available evidence, it is more likely than not that some or all of the deferred
tax assets will not be realized.

INVESTMENT TAX CREDITS

     Investment tax credits for research and development expenditures
incurred by Cubist's Canadian operations are recorded as a reduction of tax
expense when collection is reasonably assured. Investment tax credits
receivable at December 31, 1999 were received in January 2000.

FAIR VALUE OF FINANCIAL INSTRUMENTS

     The carrying amounts of Cubist's financial instruments, which include cash
and cash equivalents, investments, accounts receivable, accounts payable, and
accrued expenses approximates their fair value due to the short-term nature of
the items. The estimated fair value of long-term debt and capital lease
obligations approximates their carrying value. The estimated fair value of
long-term debt and capital lease obligation has been determined using current
interest rates for similar instruments.

     In evaluating the fair value information, considerable judgment is required
to interpret the market data used to develop the estimates. The use of different
market assumptions and/or different valuation techniques may have a material
effect on the estimated fair value amounts. Accordingly, the estimates of fair
value presented herein may not be indicative of the amounts that could be
realized in a current market exchange.

FOREIGN CURRENCY AND INTEREST RATE RISK

     Cubist operates internationally, which gives rise to a risk that earnings
and cash flows may be negatively impacted by fluctuations in interest and
foreign exchange rates. To the date of these financial statements, Cubist has
not entered into foreign currency hedging arrangements.

NET LOSS PER COMMON SHARE

     Basic net loss per share is computed using the weighted average number of
shares of common stock outstanding. Diluted net loss per share does not differ
from basic net loss per share since potential common shares from stock options,
warrants, convertible debt and notes payable are antidilutive for all periods
presented and are therefore excluded from the calculation. During the years
ended December 31, 1998, 1999 and 2000, options to purchase 1,535,810,
2,006,829, and 2,920,895 shares of common stock, respectively, warrants for
3,120,314, 2,793,239, and 1,578,652 shares of common stock, respectively, and
convertible debt and notes payable convertible into 0, 87,158, and 668,969
shares of common stock, respectively, were not included in the computation of
diluted net loss per share since their inclusion would be antidilutive.

OTHER COMPREHENSIVE INCOME (LOSS)

     Comprehensive loss consists of net loss and foreign currency translation
adjustments which is presented in the Statement of Stockholders' Equity.

ACCOUNTING FOR STOCK BASED COMPENSATION

     Cubist accounts for stock-based awards to employees using the intrinsic
value method as prescribed by Accounting Principles Board ("APB") No. 25,
"Accounting for Stock Issued to Employees," and related interpretations.
Accordingly, no compensation expense is recorded for options issued to employees
in fixed amounts and with fixed exercise prices at least equal to the fair
market value of common stock at the date of grant. Cubist applies the provisions
of Statement of Accounting Standards ("SFAS") No. 123, "Accounting for
Stock-Based Compensation," through disclosure only (Note L). All stock-based
awards to non-employees are accounted for at their fair value in accordance with
SFAS No. 123.


<PAGE>
                                      -49-




FOREIGN CURRENCY

     Prior to October 1, 2000 the functional currency of Cubist's subsidiaries,
which are located in Canada and United Kingdom, was the Canadian dollar. The
remeasurement of the foreign currency balances into the Canadian dollar
functional currency was performed as follows, according to the remeasurement
method:

     - Monetary items are remeasured at the rate of exchange in effect at the
       balance sheet date;

     - Non-monetary items are remeasured at historical exchange rates; and

     - Revenue and expense items are remeasured at the average exchange rate
       prevailing in the period.

     The translation of the Canadian functional currency financial statements
into the United States dollar was performed as follows:

     - Assets and liabilities were translated at period end exchange rates; and

     - Revenues and expenses were translated using the average rates prevailing
       in the period.

         The resulting effects of foreign currency translation adjustments have
been accumulated and are included as other comprehensive income in the statement
of stockholders' equity.

     Effective October 1, 2000 the functional currency for all of Cubist's
subsidiaries was changed to the United States dollar. Accordingly, the
remeasurement method is used to convert the foreign currency balances from the
local currency into the United States dollar.

     Foreign exchange gains (losses) of ($1,080), $196,584 and $570,022 in the
years ended December 31, 1998, 1999 and 2000 are included in the other income
(expense) for the period.

DEEMED DEBT DISCOUNTS

     As applicable, the consideration received on debt instruments issued is
allocated between the debt, the fair value of detachable warrants issued with
the debt and the intrinsic value of beneficial (in-the-money) conversion
options. Debt is disclosed net of deemed discounts. Discounts attributable to
detachable warrants are amortized to interest expense over the term of the debt.
Discounts attributable to a beneficial conversion option are amortized over the
period to the initial conversion date. Amortization is calculated by the
effective interest method.

RECENT ACCOUNTING PRONOUNCEMENT

     In June 1998, the Financial Accounting Standards Board issued Statement
of Financial Accounting Standards No. 133 ("SFAS") "Accounting for Derivative
Instruments and Hedging Activities", which was amended by SFAS No. 137 and is
effective for fiscal years beginning after June 15, 2000. The statement
establishes accounting and reporting standards requiring that every
derivative instrument be recorded in the balance sheet as either an asset or
liability measured at its fair value. SFAS No. 133 also requires that changes
in the derivative's fair value be recognized currently in earnings unless
specific hedge accounting criteria are met. Adoption of this standard is not
expected to have a material impact on the financial position or results of
operations of Cubist.

C. BUSINESS COMBINATIONS

TERRAGEN DISCOVERY INC.

     On October 23, 2000, Cubist indirectly through its subsidiary C&T
Acquisition Corporation acquired all of the issued and outstanding common and
preferred shares of TerraGen, and assumed all of the outstanding options,
warrants and convertible debentures of TerraGen, by issuing 334,933 shares of
Cubist common stock and causing C&T Acquisition Corporation to issue 178,491
exchangeable shares. Each common share of TerraGen was exchanged, at the
election of the holder, for either 0.021323 exchangeable shares or 0.021323
shares of Cubist common stock and each preferred share was exchanged, at the
election of the


<PAGE>
                                      -50-



holder, for either 0.030386 exchangeable shares or 0.030386 shares of Cubist
common stock. The exchangeable shares are exchangeable at any time at the option
of the holder, on a one-for-one basis, for shares of Cubist common stock. All
exchangeable shares that remain outstanding will be automatically exchanged for
Cubist common stock on October 23, 2002. The options, warrants and convertible
debentures of TerraGen assumed by Cubist pursuant to the acquisition are
exercisable for 94,605 shares of Cubist common stock. This acquisition had been
accounted for using the pooling-of-interests method of accounting. The balances
as at December 31, 1999 and the results for the years ended December 31, 1998
and 1999 have been restated to include the balances and results of C&T
Acquisition Corporation and TerraGen and its subsidiaries. The financial results
for the year ended December 31, 2000 include the results of the previously
separate businesses for the nine months ended September 30, 2000 prior to the
consummation of the transaction. Revenue and net loss from the previously
separate operations of Cubist and TerraGen were revenues of $2,496,247 and
$1,760,573 and net loss of $23,171,029 and $3,737,752, respectively in the nine
months ended September 30, 2000, which are included in these consolidated
financial statements. Results on a stand-alone basis were as follows:

<TABLE>
<CAPTION>
        YEAR ENDED                                                          COMBINED
     DECEMBER 31, 1998           CUBIST                TERRAGEN               RESTATED
- -------------------------    -----------------    -------------------    --------------------
<S>                             <C>                     <C>                  <C>
Revenue                            $1,634,199                $39,953              $1,674,152
Operating loss                   (12,350,323)            (2,783,911)            (15,134,234)
Net loss                         (11,825,006)            (2,564,590)            (14,389,596)
Net loss per share                     (0.97)                (15.03)                  (1.16)
</TABLE>

<TABLE>
<CAPTION>
         YEAR ENDED                                                         COMBINED
     DECEMBER 31, 1999           CUBIST                TERRAGEN               RESTATED
- -------------------------    -----------------    -------------------    --------------------
<S>                             <C>                     <C>                  <C>
Revenue                            $5,353,379             $1,493,005              $6,846,384
Operating loss                   (18,295,676)            (6,793,875)            (25,089,551)
Net loss                         (17,813,510)            (6,308,351)            (24,121,861)
Net loss per share                     (0.99)                (15.21)                  (1.31)
</TABLE>


There were no intercompany transactions between the two companies prior to
consummation of the transaction.

CHROMAXOME CORPORATION

     On March 17, 1999 Cubist's Canadian subsidiary purchased substantially
all of the assets of ChromaXome Corporation under an asset purchase agreement
dated March 12, 1999, among Cubist, Trega Biosciences and ChromaXome
Corporation ("ChromaXome"). The consideration paid, excluding acquisition
costs, for the assets acquired consisted of approximately $2 million in cash,
notes payable of approximately $3 million and 18,231 shares of common stock
having an estimated fair value of $673,405. The notes payable bore interest
at a rate of 9.5% and were repaid prior to December 31, 2000.

XENOVA DISCOVERY

     On April 8, 1999 Cubist's Canadian subsidiary purchased substantially
all of the assets of Xenova Discovery Ltd. under an asset purchase agreement
dated April 8, 1999, among Cubist, Xenova Group PLC ("Xenova Group") and
Xenova Discovery Ltd. ("Xenova"). The consideration paid, excluding
acquisition costs, for the assets acquired consisted of $402,250 in cash,
notes payable of $3,619,663 and 30,386 shares of common stock having an
estimated fair value of $1,140,761. One note payable of $1,375,715 was due
and repaid as of December 31,1999. The second note payable bears interest at
a rate of LIBOR plus 1% (6.375% at December 31, 2000). The note payable is
due April 8, 2002 and is repayable at any time by Cubist and may be converted
into 58,282 shares of common stock at any time after 24 months from the date
of closing, at the option of either Xenova Group or Cubist. The interest on
the second note payable is being repaid quarterly, and at December 31, 2000
the balance outstanding was $2,243,948.

     The acquisitions of ChromaXome and Xenova have been accounted for by the
purchase method with results of operations of the acquired entities included in
the financial statements of Cubist from the dates of acquisition.


<PAGE>
                                      -51-



<TABLE>
<CAPTION>
                                                CHROMAXOME          XENOVA            TOTAL
                                             ---------------   ---------------   ---------------
<S>                                            <C>            <C>                 <C>
Capital assets                                      $22,806        $1,060,414        $1,083,220
Intangible assets                                 5,574,326         4,380,939         9,955,265
In-process research and development                 407,310           344,994           752,304
Liabilities assumed                                 (2,511)         (278,567)         (281,078)
                                                -----------      ------------      ------------
Net assets acquired                               6,001,931         5,507,780        11,509,711

Consideration:
               Notes payable                    (3,013,094)       (3,619,663)       (6,632,757)
               Shares issued                      (673,405)       (1,140,761)       (1,814,166)
                                               ------------      ------------      ------------
Cash (including acquisition costs)              $2,315,432          $747,356        $3,062,788
                                               ============      ============      ===========
</TABLE>

     Acquired in-process research and development materially represents acquired
tangible assets having no alternative future use outside of specified research
and development activities.

     The following table reflects, on an unaudited pro forma basis, the combined
results of Cubist's operations acquired for the years ended December 31, 1998
and 1999 as if all such acquisitions had taken place immediately prior to the
beginning of the respective years presented. Appropriate adjustments have been
made to reflect the accounting basis used in recording these acquisitions. No
adjustments have been recorded for nonrecurring charges arising on the
acquisitions. This pro forma information does not purport to be indicative of
the results of operations that would have resulted had the acquisitions been in
effect for the entire years presented, and is not intended to be a projection of
future results or trends.

<TABLE>
<CAPTION>
                                                 1998              1999
                                                 TOTAL             TOTAL
                                                 -----             -----
<S>                                           <C>               <C>
Revenues                                      $ 1,674,152       $ 6,846,384
Net loss                                      $21,153,557       $25,851,246
Net loss per share                            $     (1.70)      $     (1.40)
</TABLE>

D. INVESTMENTS

     At December 31, 1999 and 2000, all investments were classified as
held-to-maturity and carried at amortized cost. Investments consisted of the
following:

<TABLE>
<CAPTION>
                                                   1999               2000
                                                   ----               ----
    <S>                                       <C>                 <C>
     Short-term:
        Commercial Paper                      $ 7,855,515       $ 5,444,093
        Corporate Bonds                         6,725,000        69,163,590
                                              -----------       -----------
                                              $14,580,515       $74,607,683
                                              ===========       ===========
     Long-Term:
        Corporate Bonds                                --       $18,234,857
                                              -----------       -----------
                                              $        --       $18,234,857
                                              ===========       ===========
</TABLE>

     At December 31, 2000, maturities of all investments classified as
long-term were due after one year through two years.

     The carrying amounts and estimated fair values of our investments at
December 31, 1999 and 2000 were as follows:

<TABLE>
<CAPTION>
                                        1999                             2000
                                        ----                             ----
                                CARRYING          FAIR          CARRYING         FAIR
                                AMOUNT            VALUE         AMOUNT           VALUE
<S>                            <C>             <C>             <C>              <C>
Cash and cash equivalents      $12,248,607     $12,248,607       $46,940,277    $46,995,641
Short-term investments          14,580,515      14,586,000        74,607,683     75,031,075
Long-term investments                   --              --        18,234,857     18,324,806
</TABLE>

     Fair values of all marketable securities are based upon quoted market
prices.



<PAGE>
                                      -52-


E. PROPERTY AND EQUIPMENT

     At December 31, property and equipment consisted of:

<TABLE>
<CAPTION>
                                                   1999            2000
                                                   ----            ----
<S>                                           <C>            <C>
Building.................................         $    --     $34,000,000
Leasehold improvements...................       2,816,007       3,951,361
Laboratory equipment.....................       5,740,898       7,143,333
Furniture and fixtures...................         575,520         692,104
Computer equipment.......................         941,325       1,319,088
                                               -----------    -----------
                                               10,073,750      47,105,886
Less accumulated depreciation
  and amortization.......................      (5,553,699)     (6,963,806)
                                               -----------    -----------
Property and equipment, net..............      $4,520,051     $40,142,080
                                               ===========    ===========
</TABLE>

     Depreciation and amortization expense was $1,292,050, $1,518,511, and
$1,634,512 in 1998, 1999 and 2000, respectively.

     On September 8, 2000, Cubist purchased for $34 million, a new corporate
headquarters building in Lexington, Massachusetts. In connection with this
purchase, Cubist issued $39 million of senior convertible notes (see Note N).
Cubist expects to occupy the new facility during the third quarter of 2001.
Accordingly, no depreciation expense has been recorded in 2000.

F. INTANGIBLE ASSETS

     At December 31, intangible assets consisted of:

<TABLE>
<CAPTION>
                                                      1999            2000
                                                      ----            ----
<S>                                              <C>             <C>
Patents......................................      $4,917,196      $5,192,577
Intellectual property and processes..........       5,038,240       4,748,769
Workforce....................................         637,559         630,628
                                                  -----------     -----------
                                                  $10,592,995     $10,571,974
Less accumulated amortization................     (1,397,842)     (3,291,912)
                                                  -----------     -----------
Intangible assets, net.......................      $9,195,153      $7,280,062
                                                  ===========     ===========
</TABLE>

     Amortization expense was $3,340, $1,393,193, and $1,928,476 in 1998, 1999
and 2000, respectively.

G. ACCRUED EXPENSES

     At December 31, accrued expenses consisted of:

<TABLE>
<CAPTION>
                                                  1999           2000
                                                  ----           ----
<S>                                          <C>            <C>
Payroll and benefits.....................       $559,181       $908,585
Drug development.........................        525,128      4,394,082
Interest.................................        240,997      1,031,333
Other....................................        453,547      1,090,576
                                              ----------    -----------
Total accrued expenses...................     $1,778,853     $7,424,576
                                              ==========     ==========
</TABLE>


<PAGE>
                                      -53-


H. COLLABORATIVE RESEARCH AGREEMENTS

     In June 1996, Cubist entered into a collaborative research agreement with
Bristol-Myers Squibb Company ("Bristol-Myers Squibb"). Under the terms of the
agreement, Bristol-Myers Squibb purchased from Cubist $4,000,000 of Cubist's
preferred stock upon execution of the agreement, which was subsequently
converted to common stock and agreed to make payments to Cubist upon the
achievement of certain milestones. In addition, Bristol-Myers Squibb reimbursed
Cubist a fixed amount for research and development expenses relating to the
production of certain targets and also for expenses relating to the screening of
Bristol-Myers Squibb compounds against Cubist's targets over three years. Cubist
recorded revenue of $1,500,000 and $500,000 in 1998 and 1999, respectively, for
certain research and development revenues and milestone payments in accordance
with the agreement. Bristol-Myers Squibb's exclusive research period ended in
January 2000 and reimbursements of Cubist's research and development costs
ceased.

     In June 1996, Cubist entered into a collaborative research agreement
with Merck & Co., Inc. ("Merck"). Under the terms of the agreement, Merck
paid Cubist a technology licensing fee upon execution and will pay certain
milestone payments if earned. In addition, Merck reimbursed Cubist for
research and development expenses relating to the production of certain
targets, for expenses relating to the screening of Merck compounds against
Cubist's targets, and for expenses relating to compound optimization through
August 1999. Cubist recorded revenue of $106,667 and $2,500,000 in 1998 and
1999, respectively, for certain research and development revenues and
milestone payments, in accordance with the agreement.

     In September 1998, Cubist's Canadian subsidiary entered into a research
and collaboration agreement with Schering-Plough Research Institute to access
Cubist's recombinant library to discover novel leads with potential activity
in the anti-infective area. As part of the agreement, Cubist would provide
library screening services to Schering-Plough for those strains provided. In
exchange for these services, Schering-Plough is making research payments to
Cubist. Schering-Plough was granted an exclusive, worldwide license to use
any recombinant microorganism that produces a lead and an exclusive,
worldwide license to all of its rights and ownership in any resulting
patents. Cubist recorded revenue of $394,000 and $397,000 in 1999 and 2000,
respectively, for certain research and development revenues in accordance
with the agreement.

     In May 1999, Cubist's Canadian subsidiary entered into a second
collaboration agreement with Schering-Plough under which Schering-Plough was
granted an exclusive, worldwide license to manufacture and sell compounds
resulting from screening Cubist's natural product library. In exchange for
the license, Schering-Plough is making research payments and, if scientific
and development milestones are achieved, Schering-Plough will make milestone
payments to us. In addition, Schering-Plough will be required to pay
royalties to Cubist on worldwide sales of any drug developed and
commercialized from any products derived from this collaboration. Cubist
recorded revenue of $217,000 and $731,000 in 1999 and 2000, respectively, for
certain research and development revenues, in accordance with the agreement.

     On February 3, 1999, Cubist entered into a research and license agreement
with Novartis Pharma AG to use Cubist's proprietary VITA functional genomics
technology to validate and develop assays for antiinfective targets and to
identify new compounds for development as antiinfective agents. In exchange for
the license, Novartis will fund a research program for a period of three years.
Further, if certain scientific and development milestones are achieved, Novartis
will make milestone payments. In addition, Novartis will be required to pay
royalties to Cubist on worldwide sales of any drug developed and commercialized
from any products derived from this collaboration. Cubist recorded revenue of
$2,041,875 and $2,750,000 in 1999 and 2000, respectively, for certain research
and development revenues and milestone payments in accordance with the
agreement. Upon the signing of the research and license agreement, Novartis
purchased, and Cubist issued to Novartis, 797,448 shares of Common Stock for a
total purchase price of $4.0 million in cash.

     On November 6, 2000, Cubist and Emisphere Technologies, entered into a
research agreement to develop an oral formulation of daptomycin. Under the terms
of the agreement, Cubist will pay a license fee of $500,000 upon execution of a
license agreement and could pay milestone payments totaling $30 million should a
product be successfully commercialized. In addition, Cubist will fund
Emisphere's research and development efforts at a rate of $250,000 per full-time
equivalent per year. Cubist would also pay a royalty on sales of any product
resulting from the collaboration and would be responsible for drug development
and would receive exclusive worldwide commercialization rights to any oral
products.

     Cubist was a party to various other collaborative research agreements that
resulted in revenues of $40,000, $882,000 and $897,000 for the years ended
December 31, 1998, 1999 and 2000, respectively. At December 31, 2000,
accounts receivable of $363,412 is due under one of Cubist's collaborative
research agreements. This amount is due from an entity that owns common stock
and holds a note payable issued by Cubist.


<PAGE>
                                      -54-



I. LICENSE AGREEMENT

     On November 7, 1997, Cubist entered into a license agreement with Eli Lilly
and Company ("Eli Lilly") which was amended on October 6, 2000, pursuant to
which Cubist acquired exclusive worldwide rights to develop, manufacture and
market daptomycin. In exchange for such license, Cubist paid an upfront license
fee in cash and, if certain drug development milestones are achieved, has agreed
to pay milestone payments by issuing shares of common stock to Eli Lilly. In
addition, Cubist will be required to pay royalties to Eli Lilly on worldwide
sales of daptomycin. On February 19, 1999 Cubist issued 56,948 shares of common
stock as a milestone payment pursuant to, and in accordance with, the terms of
the agreement. The value of the common stock was $250,000 and was recorded as
research and development expense.

     Cubist's Canadian subsidiary and Diversa Corporation entered into a
cross-license ("Cross-license Agreement") dated November 18, 1999, pursuant
to which Cubist granted a co-exclusive world-wide non-royalty bearing license
to certain patented technology of Cubist, subject to certain restrictions.
Under the Cross-license Agreement, Diversa paid an upfront license fee of
$2,500,000 and will pay annual license maintenance fees, until the patents
expire. Cubist is required to repay the upfront license fee if it were to
merge or be acquired prior to November 18, 2004 by a company whose primary
business is DNA shuffling. No upfront license issue fee revenue was
recognized in 1999 and 2000. Revenue of $100,000 was recognized in 2000
related to the annual license maintenance fee.

     On November 22, 2000, Cubist and International Health Management
Associates, Inc. ("IHMA") signed a license agreement to utilize IHMA's
expertise and experience in "bridge" oral drug delivery technologies to
research, develop and commercialize oral forms of ceftriaxone. In exchange
for such license, Cubist paid an undisclosed upfront license fee which was
recorded as research and development expense in 2000, and if certain drug
development milestones are achieved, Cubist will pay milestone payments.
Cubist will also be required to pay royalties to IHMA on worldwide sales of
any oral formulation of ceftriaxone.

J. FINANCINGS

     On May 1, 1997, Cubist's Canadian subsidiary completed a private
placement financing with investors and raised net proceeds of $3.5 million
(less financing costs of $41,664) by issuing 88,848 shares of common stock,
along with 44,424 warrants exercisable for common stock at $56.28 Cdn per
share. On October 8, 1998 there was a second closing of this private
placement financing resulting in Cubist raising an additional $3.2 million by
issuing 88,848 shares of Cubist common stock, along with 44,424 warrants
exercisable for Cubist common stock at $56.28 Cdn per share. These warrants
were exercisable immediately and expire on May 1, 2001. In connection with
the pooling-of-interests transaction consummated on October 23, 2000 between
Cubist and TerraGen, the exercise price for all warrants outstanding as of
that date was set at a United States dollar equivalent of $37.25 per share.

     In December 1998, the stockholders of Cubist's Canadian subsidiary
authorized the exchange of all the then outstanding warrants to purchase
common stock issued in connection with the May 1997 and October 1998 private
placement financing for common stock on a 3 for 1 basis, for no additional
consideration. Under these terms, 87,936 warrants were exchanged for 29,312
shares of common stock on December 31, 1998.

     On September 23, 1998, Cubist completed a private placement financing with
investors and raised approximately $13.6 million (less financing costs of
approximately $901,000) by issuing 6,065,560 shares of common stock at $2.25 per
share, along with 3,032,783 warrants exercisable for common stock at $2.25 per
share. The warrants are exercisable at any time until September 23, 2003. The
values of the warrants and common stock in excess of par value have been
reflected in additional paid-in-capital.

     On March 15, 1999, Cubist's Canadian subsidiary completed a private
placement financing with investors and raised net proceeds of $5.2 million,
(less financing costs of $9,200,) by issuing 142,157 shares of common stock.

     On October 21, 1999, Cubist completed a private placement financing with
investors and raised approximately $18.8 million (less financing costs of
$1,328,892) by issuing 2,503,333 shares of common stock at $7.50 per share.

     On January 29, 2000, Cubist completed a private placement financing with
investors and raised approximately $55.0 million (less estimated financing costs
of $3,039,000) by issuing 2,200,000 shares of common stock at $25.00 per share.



<PAGE>
                                      -55-


     On April 3, 2000, Cubist completed a secondary public offering and raised
approximately $82.5 million (less financing costs of $4,957,275) by issuing
2,500,000 shares of common stock at $33.00 per share. In addition, on May 3,
2000, the underwriters exercised their option to purchase an additional 375,000
shares of common stock at $33.00 per share to cover over-allotments, raising an
additional $12.4 million (less financing costs of $680,625).


K. STOCKHOLDERS' EQUITY

WARRANTS

     In February 1999, Cubist issued to Bridge Technology Group a warrant
exercisable for 25,000 shares common stock at $4.31 per share. The value of
the warrant was determined using the Black-Scholes option-pricing model.
Cubist recorded general and administrative expense of $70,680 and $6,427 in
1999 and 2000, respectively. The warrant was exercised during the year ended
December 31, 2000.

NOTES RECEIVABLE FROM RELATED PARTIES

     Cubist accepted a promissory note from the Chief Executive Officer in
consideration for the preferred stock issued to him in 1997. The note fell
due in equal quarterly installments of $10,000 commencing on March 31, 1998.
On October 14, 1999 the principal amount of this note was paid in full.

     In September 1999, Cubist accepted a promissory note from a Senior Vice
President in consideration for 50,000 shares of restricted common stock issued
to him. The aggregate principal amount of this note at December 31, 2000 is
$337,500 and is reflected in stockholders' equity as a reduction to
paid-in-capital. This note has an annual interest rate of 4% and is due on
September 25, 2002. The note is being forgiven in three equal annual
installments of $168,750, contingent upon the Senior Vice President's continued
employment, until September 2002.

     On September 18, 2000, Cubist accepted a promissory note of $250,000 from
the Chief Executive Officer. This note has an annual interest rate of 6.15% and
is due on March 31, 2002. In the event the note is repaid prior to December 31,
2001, no interest will be charged.


L. STOCK OPTIONS

     Under the Cubist 1993 Amended and Restated Stock Option Plan, options to
purchase 5,085,181 shares of common stock may be granted to employees,
directors, officers or consultants. The options are generally granted at fair
market value on the date of the grant, vest ratably over a four-year period and
expire ten years from the date of grant. At December 31, 2000, there were
1,156,641 shares available for future grant.

     Under the Cubist 2000 Nonstatutory Stock Option Plan, options to purchase
1,000,000 shares of common stock may be granted to employees, directors,
officers or consultants. The options are generally granted at fair market value
on the date of the grant, vest ratably over a four-year period and expire ten
years from the date of grant. At December 31, 2000, there were 1,000,000 shares
available for future grant.

     Under the TerraGen Discovery Inc. Employee Stock Option Plan, incentive and
non-qualified stock options may be granted to United Kingdom and Canadian
employees, directors and consultants. Options typically vest ratably over a
maximum four-year period and expire ten years from the date of grant. In
connection with the acquisition by Cubist, Cubist assumed the TerraGen plan and
all of the TerraGen options were converted at the acquisition exchange ratio of
0.021323 per share of common stock into options to acquire common stock of
Cubist. The assumed options are exercisable upon the same terms and conditions
as provided in the TerraGen plan except that the assumed options are exercisable
for shares of Cubist common stock upon payment of the revised exercise price in
United States dollars.

     Had compensation costs for Cubist's stock-based compensation plan been
determined based on the fair value at the grant dates as calculated in
accordance with SFAS 123, Cubist's net loss and loss per share for the years
ended December 31, 1998, 1999 and 2000 would have been increased to the pro
forma amounts indicated below:

<PAGE>
                                      -56-




<TABLE>
<CAPTION>
                                 1998                            1999                          2000
                                 ----                            ----                          ----
                      NET LOSS         BASIC AND      NET LOSS         BASIC AND      NET LOSS         BASIC AND
                      --------        ----------      --------        ----------      --------         ---------
                                    DILUTED LOSS                    DILUTED LOSS                    DILUTED LOSS
                                    ------------                    ------------                    ------------
                                       PER SHARE                       PER SHARE                       PER SHARE
                                       ---------                       ---------                       ---------
<S>                 <C>                  <C>         <C>                 <C>         <C>                 <C>
As Reported.......  $(14,389,596)        $(1.16)     $(24,121,861)       $(1.31)     $(44,300,576)       $(1.68)
Pro forma.........  $(15,656,293)        $(1.26)     $(26,713,559)       $(1.45)     $(59,918,426)       $(2.27)
</TABLE>

     The fair value of each stock option was estimated on the date of grant
using the Black-Scholes option-pricing model. The following weighted-average
assumptions were used for fiscal 1998:

<TABLE>
<CAPTION>
                                                         CUBIST              TERRAGEN
                                                         ------              --------
<S>                                                      <C>                 <C>
Expected stock price volatility                            97%                113%
Risk free interest rate                                   4.7%               5.01%
Expected annual dividend yield per share                    0%                  0%
Expected life of options                                    4 years          3.65 years
</TABLE>

     The following weighted-average assumptions were used for fiscal 1999:

<TABLE>
<CAPTION>
                                                            CUBIST            TERRAGEN
                                                            ------            --------
<S>                                                         <C>               <C>
Expected stock price volatility                              74%                 102%
Risk free interest rate                                     5.3%                5.10%
Expected annual dividend yield per share                      0%                   0%
Expected life of options                                      7 years           3.82 years
</TABLE>

     The following weighted-average assumptions were used for fiscal 2000:

<TABLE>
<CAPTION>
                                                            CUBIST AND TERRAGEN
                                                            -------------------
<S>                                                         <C>
Expected stock price volatility                                  87%
Risk free interest rate                                         6.2%
Expected annual dividend yield per share                          0%
Expected life of options                                          7 years
</TABLE>

     The effects of applying SFAS 123 in this pro forma disclosure are not
indicative of future amounts. Additional awards in future years are anticipated.

     A summary of the status of Cubist's stock option plan as of December 31,
1998, 1999 and 2000, and changes during each of the years then ended, is
presented below:


<TABLE>
<CAPTION>
                                                  1998                         1999                         2000
                                                  ----                         ----                         ----
                                                        WAEP*                         WAEP*                        WAEP*
                                           NUMBER     PER SHARE        NUMBER       PER SHARE         NUMBER      PER SHARE
                                           ------     ---------        ------       ---------         ------      ---------
<S>                                      <C>          <C>           <C>               <C>          <C>              <C>
Balance at January 1................       809,910      $4.98        1,535,810         $4.01        2,006,829        $5.11
Granted.............................     1,010,484       4.10          887,866          6.57        1,316,403        36.09
Exercised...........................        (3,642)     (1.23)        (140,420)        (2.94)        (347,731)       (3.94)
Canceled............................      (280,942)     (7.20)        (276,427)        (3.97)         (54,606)      (29.57)
                                         ----------     ------        ---------        ------       ----------      -------
Balance at December 31..............     1,535,810      $4.01        2,006,829         $5.11        2,920,895       $18.75
                                         =========                   =========         =====        =========       ======
Weighted average grant-date fair
   value of options granted during
   the year:
   Exercise price greater than
      grant date stock fair value...         $20.18                      $22.66                             --
   Exercise price equals grant date
      stock fair value..............          $2.42                       $3.72                         $26.70
   Exercise price less than grant
      date stock fair value.........             --                       $7.94                         $30.64

*    Weighted-average exercise price
</TABLE>


<PAGE>
                                      -57-




     The following table summarizes information about stock options outstanding
at December 31, 2000:

<TABLE>
<CAPTION>
                                   OPTIONS OUTSTANDING                          OPTIONS EXERCISABLE
                                   -------------------                          -------------------
RANGE OF                   NUMBER          REMAINING     WEIGHTED-AVERAGE        NUMBER   WEIGHTED-AVERAGE
EXERCISE PRICES       OUTSTANDING   CONTRACTUAL LIFE       EXERCISE PRICE   EXERCISABLE     EXERCISE PRICE
- ---------------       -----------   ----------------     ----------------   -----------   ----------------
<S>                      <C>           <C>                  <C>             <C>               <C>
$.007--$1.96.........      157,736      5.2 years             $1.80           157,736          $ 1.80
$2.25--$5.00.........      908,678      8.0 years              3.21           327,314            3.04
$5.25--$7.00.........      310,337      6.9 years              5.80           201,334            5.87
$8.00--$11.625.......      641,244      8.9 years             11.10           142,423           10.83
$30.00--$63.375......      902,900      9.3 years             47.40           100,557           52.80
                           -------      ---------            ------          --------          ------
                         2,920,895      8.3 years            $18.75           929,364          $10.02
                         =========      =========            ======          ========          ======
</TABLE>

     Cubist records deferred compensation for stock options issued with
exercise prices below the fair value of common stock as of the measurement
date. Deferred compensation is amortized and recorded as compensation expense
ratably over the vesting period of the stock options. Compensation expense of
$0, $43,945, and $697,966 was recognized in 1998, 1999 and 2000, respectively.

M. COMMITMENTS AND CONTINGENCIES

     Cubist leases its facilities under operating lease agreements, which
extend through 2010. Certain of these leases contain renewal options and
provisions that adjust the base payment based upon changes in the consumer
price index and require Cubist to pay operating costs, including property
taxes, insurance and maintenance. In 1993, Cubist provided a security deposit
of $100,000 upon execution of a lease. The security deposit bears interest in
a segregated account, and was partially refunded ($79,000 plus interest) on
the fifth anniversary, and is fully refundable plus interest within thirty
days after the expiration of the lease, provided no event of default has
occurred. In 1995, Cubist entered into an agreement with the landlord under
which the landlord provided financing of $345,500 to Cubist for expansion of
the facility, which was payable in equal monthly installments of $7,685 over
five years with an annual interest rate of 12% through February 2000. No
additional security deposit was required. At December 31, 2000, there was no
outstanding principal balance.

         Cubist leases certain equipment under long-term capital leases. The
cost of this equipment included in fixed assets was approximately $2,395,481 and
$1,795,888, with associated accumulated depreciation of approximately $1,335,134
and $1,288,754, at December 31, 1999 and 2000, respectively. Cubist intends to
purchase all of the leased equipment at a price to be negotiated at lease end.
Future lease payments for non-cancelable leases for the respective years ended
December 31 are as follows:


<TABLE>
<CAPTION>
                                                            OPERATING LEASES    CAPITAL LEASES
                                                            ----------------    --------------
<S>                                                            <C>               <C>
2001...................................................          1,364,085            696,400
2002...................................................          1,144,774            340,157
2003...................................................          1,025,382                --
2004...................................................            562,500                --
2005 and thereafter....................................          3,525,000                --
                                                                 ---------            ------
       Total minimum lease payments....................         $7,621,741        $1,036,557
                                                                ----------        ----------
       Less amount representing interest payments......                             (102,704)
                                                                                  ----------
       Present value of minimum lease payments.........                              933,853
       Less current portion............................                             (615,880)
                                                                                  ----------
       Long-term obligation............................                           $  317,973
                                                                                  ==========
</TABLE>

     Lease payments under operating leases were $459,481, $763,503 and $906,889
in 1998, 1999 and 2000, respectively are approximately $20 million.



<PAGE>
                                      -58-



     Cubist is party to various agreements, including those related to clinical
trial management, for which noncancelable minimum future payments due during
the year ended December 31, 2001 are approximately $20 million.


N. LONG TERM DEBT

<TABLE>
<CAPTION>
                                                                                              1999             2000
                                                                                              ----             ----
<S>                                                                                       <C>              <C>
Note payable issued in conjunction with the acquisition of ChromaXome (Note C)...         $1,000,000       $       --
Note payable issued in conjunction with the acquisition of Xenova (Note C).......          2,400,440        2,243,948
Convertible debentures, net of deemed discount...................................            886,884               --
Term loan agreement .............................................................          1,139,578        2,643,642
Notes payable to MM Venture Finance Partnership..................................                 --        1,062,079
Senior convertible notes.........................................................                 --       39,000,000
Other............................................................................             15,193               --
                                                                                         -----------      -----------
                                                                                           5,442,095       44,949,669
       Less current portion......................................................         (2,490,231)      (1,692,340)
                                                                                         -----------      -----------
       Long-term obligation......................................................         $2,951,864      $43,257,329
                                                                                          ----------      -----------
</TABLE>

     During March 1999, Cubist entered into a term loan agreement with a bank
under which Cubist is able to borrow up to $1,500,000 to finance fixed asset
purchases. In March 2000, Cubist increased its term loan by an additional
$2,000,000 to finance leasehold improvements and fixed asset purchases.
Advances under this facility are to be repaid over a 36-month period,
commencing on March 31, 2000. Interest on the borrowings is at the bank's
LIBOR rate (9.03% at December 31, 2000). Borrowings under the facility are
collateralized by all capital equipment purchased with the funds under this
term loan. At December 31, 2000, there were no amounts available for
borrowing under the term loan agreement.

     On November 16, 1999, Cubist's Canadian subsidiary issued convertible
debentures of $1,625,000 Cdn. The convertible debentures bear interest at a
rate of 12% collateralized by all present and after-acquired property of the
former TerraGen Discovery Inc. The convertible debentures were convertible
into common stock at the option of the holder at $37.25 per share. On March
31, 2000, Cubist issued 30,176 shares of common stock upon conversion of the
convertible debentures principal and related interest. In connection with the
issuance of the convertible debentures, Cubist issued warrants to purchase
49,377 shares of common stock at $37.25 per share. The warrants became
exercisable on December 31, 1999 and expire November 16, 2004.

     The estimated value of the detachable warrants of $323,000 was recorded as
a discount on the convertible debentures and was amortized to interest expense
over the term of the debt using the effective interest method. Interest expense
of $108,000 and $215,000 was recorded in 1999 and 2000, respectively.

     The convertible debenture has a beneficial conversion feature valued at
$264,300, equal to the aggregate excess market value of the underlying common
stock at the agreement date over the conversion rate. The beneficial conversion
feature was recorded as additional paid-in capital and recognized on issuance as
interest expense, as the debenture was immediately convertible to common stock.

     On January 17, 2000, Cubist's Canadian subsidiary issued notes payable
to MM Venture Finance Partnership ("MM") totaling $2,000,667. The notes
payable bear interest at 14.4% and is being repaid over 36 months through
January 17, 2003. The assets of the former TerraGen Discovery Inc.,
including its patents, were pledged as collateral for the loan. In addition,
MM received and later exercised warrants to purchase 22,790 shares of common
stock for gross proceeds of $606,665. The estimated value of the detachable
warrants of $658,606 was recorded as a discount on the notes payable and is
being amortized to interest expense over the term of the note payable using
the effective interest method. Interest expense of $138,400 was recorded in
2000.

     On September 8, 2000, Cubist issued $39,000,000 of senior convertible
notes to John Hancock Life Insurance company to finance the purchase of a new
corporate headquarters building in Lexington, Massachusetts, which serves as
the collateral for senior convertible notes. The senior convertible notes are
convertible, at the option of the holder, into common stock at a price equal
to $63.8625 per share. The senior convertible notes bear interest at a rate
of 8.5% per year and Cubist is required to make semi-annual interest payments
on the outstanding principal balance. The senior convertible notes are
redeemable by Cubist at any time on or after September 8, 2003 at 103% of the
principal amount outstanding as of the redemption date. In the event of a
change in control, as defined in senior convertible note agreements, the
holders could require Cubist to repurchase senior convertible notes at 100%
of the outstanding principal and interest. The deferred costs associated with
the sale of the senior convertible notes were $1,324,605 of which $81,029 was
amortized to interest expense in 2000.

<PAGE>
                                      -59-


     At December 31, 2000, payments of principal and interest on existing debt
were due as follows:

<TABLE>
<S>                                          <C>
Fiscal year ending December 31,
2001......................................     $ 5,100,848
2002......................................       7,746,637
2003......................................       4,158,938
2004......................................       3,315,000
2005......................................      41,486,250
                                                ----------
Total payments............................      61,807,673
Less amounts representing interest........     (16,858,004)
                                              ------------
Total debt................................     $44,949,669
Less current portion......................      (1,692,340)
                                               -----------
                                               $43,257,329
                                               ===========
</TABLE>




O. EMPLOYEE BENEFITS

     Cubist maintains a 401(k) savings plan in which substantially all of its
permanent employees in the United States are eligible to participate.
Participants may contribute up to 15% of their annual compensation to the plan,
subject to certain limitations. Cubist contributes a matching amount in cash of
up to 1.5% of a participant's total compensation or $500 annually, whichever is
less, or a match in common stock up to 4.5% of a participant's total
compensation or 75% of a participant's total contribution annually, whichever is
less. Matches distributed in common stock have immediate vesting. Cubist
contributed $6,160, $5,853 and $5,227 during 1998, 1999 and 2000, respectively.
Cubist issued 28,420 and 14,939 shares of common stock in 1999 and 2000,
respectively, pursuant to this plan. No shares were issued prior to 1999.

     Cubist maintains a Group Registered Retirement Savings Plan ("RRSP"),
independent to each employee, through a nationally recognized funds manager.
Substantially all of the permanent employees in Canada are eligible to
participate. Participants may contribute up to 18% of their previous years
earned income, subject to certain limitations. Cubist will make a matching
contribution of up to 3% of an employee's salary. Cubist's Canadian
subsidiary contributed $27,639, $33,704 and $23,657 during 1998, 1999 and
2000, respectively.

     Cubist maintains a Contracted In Money Purchase Scheme for all employees
in the United Kingdom. Participants many contribute up to 10% of their annual
compensation to the scheme. Cubist matches contributions at a level up to 10%
of an employee's salary. Cubist's United Kingdom subsidiary contributed $0,
$42,083 and $50,229 during 1998, 1999 and 2000, respectively.

     Cubist instituted an employee stock purchase plan in 1998, in which
substantially all of its permanent employees are eligible to participate.
Participants may contribute up to 15% of their annual compensation to the plan,
subject to certain limitations. The plan allows participants to purchase Cubist
common stock, after a pre-determined six-month period, through payroll
deductions at a price 15% less than the lower of the closing price for the
beginning or ending date of the purchase period. The plan allows for the
issuance of 250,000 shares of common stock to eligible employees. During 1998,
1999 and 2000, Cubist issued 6,341, 11,615 and 12,827 shares of common stock,
respectively, pursuant to this plan.

P. INCOME TAXES

     Net income/(loss) before income taxes for domestic and foreign operations
is as follows:

<TABLE>
<CAPTION>
                                           YEAR ENDED DECEMBER 31,
                                           -----------------------
                                    1998                 1999                2000
                                    ----                 ----                ----
<S>                            <C>                  <C>                 <C>
Domestic...................... $(11,825,006)        $(17,813,510)       $(38,938,164)
Foreign.......................   (2,740,087)          (7,233,944)         (5,861,106)
                              --------------       --------------      --------------
                               $(14,565,093)        $(25,047,454)       $(44,799,270)
                              ==============       ==============      ==============
</TABLE>


     Based on Cubist's current financial status, realization of Cubist's
deferred tax assets does not meet the "more likely than not" criteria under SFAS
No. 109 and, accordingly, a valuation allowance for the entire deferred tax
asset amount has been recorded. The components of the net deferred tax asset and
the related valuation allowance are as follows:

<PAGE>
                                      -60-

<TABLE>
<CAPTION>
                                                  1999                 2000
                                                  ----                 ----
<S>                                         <C>                   <C>
Deferred income tax assets:
Net operating loss carryforwards...........   $ 18,654,488         $ 39,231,437
Research and development costs.............      3,754,689            3,414,689
Tax credit carryforwards...................      2,786,000            3,657,017
Deferred revenues..........................        997,630              997,630
Other, net.................................      1,041,085              963,905
                                               -----------           ----------
Total deferred tax assets..................     27,233,892           48,264,678
Valuation allowance........................    (27,233,892)         (48,264,678)
                                              ------------         ------------
Net deferred tax assets....................   $        ---         $        ---
                                              ============         ============
</TABLE>


The following is a reconciliation between the United States federal statutory
rate and the effective tax rate:

<TABLE>
<CAPTION>
                                 1998         1999         2000
                                 ----         ----         ----
<S>                             <C>         <C>          <C>
Federal statutory rate          (34.0%)      (34.0%)      (34.0%)
State taxes                      (5.1%)       (4.5%)       (5.4%)
Foreign rate differential         0.8%         1.2%         0.5%
Investment tax credit            (1.2%)       (3.7%)       (1.1%)
Valuation allowance              38.3%        37.3%        38.9%
                                -----        -----        -----
Effective tax rate               (1.2%)       (3.7%)       (1.1%)
                                =====        =====        =====
</TABLE>

     At December 31, 2000, Cubist has U.S. federal net operating loss
carryforwards of approximately $90.8 million, which begin to expire in 2007,
state net operating loss carryforwards of $82.0 million, which begins to
expire in 2001, and $7.5 million of foreign net operating loss carryforwards
which begin to expire in 2004. Of the total net operating loss carryforwards
$6.2 million relates to the exercise of stock options. The tax benefit of
this amount will result in an increase in additional paid-in capital upon
realization of these losses. Cubist also has federal, state and foreign
credit carryforwards of $1,765,000, $1,546,000, and $170,000, respectively,
which begin to expire in 2006.

     Ownership changes resulting from the issuance of capital stock may limit
the amount of net operating loss and tax credit carryforwards that can be
utilized annually to offset future taxable income. The amount of the annual
limitation is determined based on Cubist's value immediately prior to the
ownership change. Subsequent significant changes in ownership could further
affect the limitation in future years.

Q. VENDOR AGREEMENTS

     In April 2000, Cubist entered into a development and supply agreement with
Abbott Laboratories (Abbott) pursuant to which Abbott has agreed to assist
Cubist in the development of daptomycin as a parenteral formulation and to
manufacture and sell exclusively to Cubist, daptomycin as a parenteral
formulation. Under the terms of this agreement, Cubist has agreed to make
certain milestone payments to Abbott for their development efforts and
assistance in obtaining an approved New Drug Application (NDA) for daptomycin.
Cubist has made payments in 2000 totaling $325,000 which were expensed as
research and development. If the FDA approves the daptomycin NDA, Cubist will
purchase minimum annual quantities of drug product from Abbott over a five year
period beginning in 2002.

     In June 2000, Cubist entered into a services agreement with Gist-brocades
Holding A.G. (DSM), an affiliated company of DSM Capua pursuant to which DSM has
agreed to provide supervisory and advisory services to Cubist relating to the


<PAGE>
                                      -61-


equipping of the manufacturing facility at DSM Capua. Cubist has also entered
into a manufacturing and supply agreement with DSM Capua pursuant to which
DSM Capua has agreed to manufacture and supply to Cubist bulk daptomycin drug
substance for commercial purposes. Under the terms of the manufacturing and
supply agreement, DSM Capua is required to prepare its manufacturing facility
in Italy to manufacture bulk daptomycin drug substance in accordance with
Good Manufacturing Practices standards. Under the terms of the service
agreements, Cubist will make a series of scheduled payments to DSM over a
five year period beginning in 2000 in order to reimburse DSM for certain
costs to be incurred by DSM Capua of approximately $7.5 million in connection
with the preparation, testing and validation of its manufacturing facility.
During 2000, Cubist reimbursed $750,000 of these costs to DSM Capua and
accrued an additional $846,000. These costs are being recorded as other
assets and will begin to be amortized upon completion of the facility and
commencement of manufacturing daptomycin for commercial purposes. In
addition, in consideration for the implementation of the Cubist technology in
the facility by DSM Capua, Cubist has agreed to make milestone payments of
$1,400,000 to DSM if specific phases of technical development of the scaled
up manufacturing process to be used in this manufacturing facility are
completed within specified periods of time. Cubist is accruing these
estimated milestone payments over the expected duration of the preparation
work and recorded research and development expense of $627,000 in 2000. Upon
completion of the preparation of DSM Capua's manufacturing facility and a
determination by the FDA that the manufacturing facility complies with Good
Manufacturing Practices standards, Cubist will purchase minimum annual
quantities of bulk daptomycin drug substance from DSM over a five-year period
beginning in 2002.

R. SEGMENT INFORMATION

Cubist operates in one business segment, the research, development and
commercialization of novel antimicrobial drugs.

The following summary discloses total revenues and long-lived assets:


<TABLE>
<CAPTION>
                                         DOMESTIC      INTERNATIONAL    CONSOLIDATED
                                         --------      -------------    ------------
<S>                                     <C>            <C>             <C>
    YEAR ENDED DECEMBER 31, 1998
Total revenue.......................     $1,634,199        $39,953      $1,674,152
Long-lived assets..................       3,894,005        385,598       4,279,603

    YEAR ENDED DECEMBER 31, 1999
Total revenue.......................     $5,353,379     $1,993,005      $6,846,384
Long-lived assets..................       3,626,174     10,268,317      13,894,491

    YEAR ENDED DECEMBER 31, 2000
Total revenue.......................     $3,197,766     $2,025,243      $5,223,009
Long-lived assets..................      42,019,412      8,694,443      50,713,855
</TABLE>

S. SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

     The following table contains Statement of Operations information for each
quarter of 1999 and 2000. Cubist believes that the following information
reflects all normal recurring adjustments necessary for a fair presentation of
the information for the period presented. The operating results for any quarter
are not necessarily indicative of results for any future period. The quarterly
financial information has been restated to reflect the acquisition of TerraGen
Discovery Inc., which was accounted for using the pooling-of-interests method of
accounting:

<TABLE>
<CAPTION>
                        FIRST     SECOND     THIRD     FOURTH
                       QUARTER    QUARTER    QUARTER   QUARTER
                       -------    -------    -------   -------
<S>                    <C>        <C>        <C>       <C>
2000
Total revenues.......   $ 1,281    $ 1,662   $ 1,314    $    966
Net loss.............   $(8,867)   $(8,733)  $(9,308)   $(17,392)

1999
Total revenues.......   $   623    $ 1,347   $ 3,366    $ 1,510
Net loss.............   $(5,319)   $(6,703)  $(4,654)   $(7,446)
</TABLE>


<PAGE>
                                      -62-


U. SUBSEQUENT EVENTS

     On January 7, 2001, Cubist and Gilead Sciences, Inc. signed a licensing
agreement for the exclusive rights to commercialize Cubist's investigational
antibacterial drug Cidecin (daptomycin for injection) and an oral formulation of
daptomycin in 16 European countries following regulatory approval. Gilead has
agreed to pay Cubist an up-front licensing fee of $13 million, and Cubist is
entitled to receive additional cash payments of up to $31 million upon
achievement of certain clinical and regulatory milestones. Gilead will also pay
Cubist a fixed royalty on net sales. Cubist will continue to be responsible for
worldwide clinical development of Cidecin, while Gilead will be responsible for
any regulatory filings in the covered territories. Gilead's sales force will
market the products in Europe.



<PAGE>
                                      -63-



ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE

     None.


                                    PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     Information with respect to Directors and compliance with Section 16(a) of
the Securities Exchange Act may be found in the sections captioned "PROPOSAL NO.
1 - ELECTION OF DIRECTORS", "EXECUTIVE COMPENSATION" and "SECTION 16(A)
BENEFICIAL OWNERSHIP REPORTING COMPLIANCE" appearing in the definitive Proxy
Statement to be delivered to Stockholders in connection with the Annual Meeting
of Stockholders to be held on June 7, 2001. Such information is incorporated
herein by reference. Information with respect to Executive Officers may be found
under the section captioned "Our Executive Officers and Directors" in Part I of
this Annual Report on Form 10-K.


ITEM 11. EXECUTIVE COMPENSATION

     The information required with respect to this item may be found in the
sections captioned "EXECUTIVE COMPENSATION" appearing in the definitive Proxy
Statement to be delivered to Stockholders in connection with the Annual Meeting
of Stockholders to be held on June 7, 2001. Such information is incorporated
herein by reference.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     The information required with respect to this item may be found in the
section captioned "PRINCIPAL STOCKHOLDERS" and "PROPOSAL NO. 1 - ELECTION OF
DIRECTORS" appearing in the definitive Proxy Statement to be delivered to
Stockholders in connection with the Annual Meeting of Stockholders to be held on
June 7, 2001. Such information is incorporated herein by reference.


ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     The Information required with respect to this item may be found in the
section captioned "CERTAIN TRANSACTIONS" appearing in the definitive Proxy
Statement to be delivered to Stockholders in connection with the Annual Meeting
of Stockholders to be held on June 7, 2001. Such information is incorporated
herein by reference.

PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(A) Documents Filed As Part Of Form 10-K

1. FINANCIAL STATEMENTS.

     The following financial statements and supplementary data are included in
Part II Item 8 filed as part of this report:

     o    Report of Independent Accountants

     o    Balance Sheets as of December 31, 2000 and 1999

     o    Statements of Operations for the years ended December 31, 2000, 1999
          and 1998

<PAGE>
                                      -64-



     o    Statements of Cash Flows for the years ended December 31, 2000, 1999
          and 1998

     o    Statements of Stockholders' Equity for the years ended December 31,
          2000, 1999 and 1998

     o    Notes to Financial Statements

2. FINANCIAL STATEMENT SCHEDULE

     None.

     Schedules not listed above have been omitted because they are not
applicable, not required or the information required is shown in the financial
statements or the notes thereto.

3.        LIST OF EXHIBITS

3.1       Restated Certificate of Incorporation of the Registrant (incorporated
          by reference to Exhibit 3 to Cubist's Quarterly Report on Form 10-Q
          filed on August 12, 1999) (File no. 000-21379)

3.2       Amended and Restated By-Laws of the Registrant, as amended to date.
          (Exhibit 3.4, Registration No. 333-6795)

4.1       Specimen certificate for shares of Common Stock (incorporated by
          reference to Exhibit 3.4 to Cubist's Registration Statement on Form
          S-1) (Registration No. 333-6795)

4.2       Rights Agreement dated as of July 21, 1999 between Cubist and
          BankBoston, N.A. as Rights Agent (incorporated by reference to Exhibit
          99.1 to Cubist's Report on Form 8-K filed on July 30, 1999) (File No.
          000-21379)

4.3       First Amendment dated as of March 7, 2000 to the Rights Agreement,
          dated as of July 21, 1999 between Cubist and Fleet National Bank f/k/a
          BankBoston, N.A. as Rights Agent (incorporated by reference to Exhibit
          4.2 to Cubist's Registration Statement on Form 8-A/A filed on March 9,
          2000) (File No. 000-21379)

+10.1     Patent License Agreement between the Registrant and the Massachusetts
          Institute of Technology, dated March 10, 1994. (Exhibit 10.1,
          Registration No. 333-6795)

+10.2     License Agreement between the Registrant and the Board of Trustees of
          Leland Stanford Junior University, dated April 1, 1994. (Exhibit 10.2,
          Registration No. 333-6795)

10.3      Employment Agreement between the Registrant and Scott M. Rocklage,
          dated June 20, 1994. (Exhibit 10.3, Registration No. 333-6795)

10.4      Consulting Agreement between the Registrant and Paul R. Schimmel,
          dated May 1, 1992. (Exhibit 10.4, Registration No. 333-6795)

10.5      Amended and Restated 1993 Stock Option Plan. (Exhibit 10.6,
          Registration No.333-6795)

10.6      Collaborative Research and License Agreement between the Registrant
          and Merck & Co., Inc., dated June 13, 1996. (Exhibit 10.8,
          Registration No. 333-6795)

10.7      Collaborative Research and License Agreement between the Registrant
          and Bristol-Myers Squibb Company and the Registrant, dated June 25,
          1996. (Exhibit 10.9, Registration No. 333-6795)

10.8      Screening Agreement, dated November 28, 1995, between the Registrant
          and Monsanto Company. (Exhibit 10.11, Registration No. 333-6795)

10.9      Letter Agreement, dated January 18, 1996, between Pharm-Eco
          Laboratories, Inc. and the Registrant. (Exhibit 10.12, Registration
          No. 333-6795)



<PAGE>
                                      -65-




+10.10    Research Collaboration and License Agreement with ArQule, Inc.,
          dated October 22, 1997. (Exhibit 10.12, Annual Report on Form 10-K,
          File No. 000-21379)

10.11     Lease Agreement between Registrant and Stimpson Family Trust dated
          April 30, 1993, regarding 24 Emily Street, Cambridge, MA., as amended
          by the First Amendment to Lease, dated September 19, 1994. (Exhibit
          10.13, Registration No.333-6795)

10.12     Form of Employee Confidentiality and Nondisclosure Agreement.
          (Exhibit 10.15, Registration No. 333-6795)

10.13     Master Lease Agreement between the Registrant and Comdisco, Inc.,
          dated as of August 30, 1993, as amended February 7, 1995, and as
          further amended on February 26, 1996. (Exhibit 10.16, Registration No.
          333-6795)

10.14     Series B Convertible Preferred Stock Purchase Warrant between the
          Registrant and Comdisco, Inc., dated August 30, 1993. (Exhibit 10.17,
          Registration No. 333-6795)

10.15     Series C Convertible Preferred Stock Purchase Warrants between the
          Registrant and Comdisco, Inc., dated February 28, 1995 and February
          26, 1996. (Exhibit 10.18, Registration No. 333-6795)

10.16     Series C Convertible Preferred Stock Purchase Options issued to
          Dr. Paul Schimmel and Dr. Julius Rebek in May 1995, as amended by
          certain Letter Agreements, dated October 23, 1995, between the
          Registrant and each of Dr. Schimmel and Dr. Rebek. (Exhibit 10.19,
          Registration No. 333-6795)

10.17     Amended and Restated Stockholders Rights Agreement by and among the
          Registrant and the parties signatory thereto. (Exhibit 10.20,
          Registration No. 333-6795)

10.18     Secured Promissory Note, dated as of July 21, 1994, by Scott M.
          Rocklage to the Registrant. (Exhibit 10.21, Annual Report on Form
          10-K, filed March 31, 1997, File No. 000-21379)

10.19     Amendment to Promissory Note, dated as of July 21, 1996, by and
          between the Registrant and Scott M. Rocklage. (Exhibit 10.22, Annual
          Report on Form 10-K, filed March 31, 1997, File No. 000-21379)

10.20     Amendment to Promissory Note, dated as of December 23, 1997, by and
          between the Registrant and Scott M. Rocklage. (Exhibit 10.22, Annual
          Report on Form 10-K, filed March 20, 1998, File No. 000-21379)

10.21     Promissory Note, dated as of October 18, 1995, by and between the
          Registrant and Scott M. Rocklage. (Exhibit 10.23, Annual Report on
          Form 10-K, filed March 20, 1998, File No. 000-21379)

+10.22    Compound Library Screening Agreement between the Registrant and
          Genzyme Corporation, dated February 24, 1997. (Exhibit 10.24,
          Amendment to Annual Report on Form 10-K/A, filed October 22, 1998,
          File No. 000-21379)

+10.23    Library Sample Evaluation Agreement between the Registrant and
          Pharmacopeia, Inc., dated as of September 11, 1996. (Exhibit 10.25,
          Amendment to Annual Report on Form 10-K/A, filed October 22, 1998,
          File No. 000-21379)

10.24     Stock Purchase Agreement, dated July 18, 1997, between International
          Biotechnology Trust plc and Cubist. (Exhibit 10.27, Registration No.
          333-33883)

10.25     Registration Rights Agreement, dated July 18, 1997, between
          International Biotechnology Trust plc and Cubist. (Exhibit 10.28,
          Registration No. 333-33883)

10.26     Registration Rights Agreement, dated July 18, 1997, between each of
          H&Q Healthcare Investors and H&Q Life Sciences Investors and Cubist.
          (Exhibit 10.29, Registration No. 333-33883)

10.27     Master Lease Agreement between the Registrant and Transamerica
          Business Credit, dated as of February 14, 1997. (Exhibit 10.33, Annual
          Report on Form 10-K, filed March 20, 1998, File No. 000-21379)


<PAGE>
                                      -66-




+10.28    License Agreement, dated November 7, 1997, between Cubist and Eli
          Lilly. (Exhibit 10.3, Amendment to Quarterly Report on Form 10-Q/A,
          filed October 22, 1998, File No. 000-21379)

+10.29    Amendment No. 1 to Collaborative Research and License Agreement with
          Merck, dated as of October 30, 1997 (Exhibit 10.1, Quarterly Report on
          Form 10-Q, filed August 12, 1998, File No. 000-21379)

+10.30    Amendment No. 2 to Collaborative Research and License Agreement with
          Merck, dated as of April 30, 1998 (Exhibit 10.2, Quarterly Report on
          Form 10-Q, filed August 12, 1998, File No. 000-21379)

10.31     First Amendment to Amended and Restated 1993 Stock Option Plan
          (Exhibit 10.3, Quarterly Report on Form 10-Q, filed August 12, 1998,
          File No. 000-21379)

10.32     1997 Employee Stock Purchase Plan. (Exhibit 10.4, Quarterly Report on
          Form 10-Q, filed August 12, 1998, File No. 000-21379)

10.33     Securities Purchase Agreement, dated as of September 10, 1998 between
          Cubist and each of the Purchasers listed on Exhibit A thereto (Exhibit
          10.1, Quarterly Report on Form 10-Q, filed November 4, 1998, File No.
          000-21379)

10.34     Registration Rights Agreement, dated as of September 10, 1998 between
          Cubist and each person listed on Exhibit A thereto (Exhibit 10.2,
          Quarterly Report on Form 10-Q, filed November 4, 1998, File No.
          000-21379)

10.35     Common Stock Purchase Warrants, dated September 23, 1998, executed by
          Cubist (Exhibit 10.3, Quarterly Report on Form 10-Q, filed November 4,
          1998, File No. 000-21379)

10.36     Collaborative Research and License Agreement between Cubist and
          Novartis Pharma AG, dated as of February 3, 1999 (Exhibit 10.1,
          Quarterly Report on Form 10-Q, filed May 13, 1999, File No. 000-21379)

10.37     Stock Purchase Agreement between Cubist and Novartis Pharma AG, dated
          as of February 3, 1999 (Exhibit 10.2, Quarterly Report on Form 10-Q,
          filed May 13, 1999, File No. 000-21379)

10.38     Restated Certificate of Incorporation as amended (Exhibit 3,
          Quarterly Report on Form 10-Q, filed August 12, 1999,
          File No. 000-21379)

10.39     Registration Rights Agreement, dated as of October 15, 1999 between
          Cubist and each person listed on Exhibit A thereto (Exhibit 10.1,
          Quarterly Report on Form 10-Q, filed November 12, 1999, File No.
          000-21379)

10.40     Registration Rights Agreement dated as of January 27, 2000 among
          Cubist and each of the Investors party thereto (Exhibit 10.1,
          Registration No. 333-96365)

10.41     Second Amendment to Amended and Restated 1993 Stock Option Plan
          (Exhibit 10.41, Annual Report on Form 10-K, filed March 10, 2000, File
          No. 000-21379)

10.42     Third Amendment to Amended and Restated 1993 Stock Option Plan
          (Exhibit 10.42, Annual Report on Form 10-K, filed March 10, 2000, File
          No. 000-21379)

10.43     Stock Pledge Agreement dated as of September 25, 1999 by and between
          Alan D. Watson and Cubist (Exhibit 10.43, Annual Report on Form 10-K,
          filed March 10, 2000, File No. 000-21379)

10.44     Letter Agreement dated September 25, 1999 between Alan D. Watson and
          Cubist (Exhibit 10.44, Annual Report on Form 10-K, filed March 10,
          2000, File No. 000-21379)

10.45     Secured Promissory Note dated as of September 25, 1999 by and between
          Alan D. Watson and Cubist (Exhibit 10.45, Annual Report on Form 10-K,
          filed March 10, 2000, File No. 000-21379)

+10.46    Manufacturing and Supply Agreement, entered into as of June 22, 2000,
          by and between Cubist and DSM Capua S.p.A (Exhibit 10.1, Quarterly
          Report on Form 10-Q, filed August 14, 2000, File No. 000-21379)


<PAGE>
                                      -67-




+10.47    Services Agreement, entered into as of June 22, 2000, by and between
          Cubist and Gist- brocades Holding A.G. (Exhibit 10.2, Quarterly Report
          on Form 10-Q, filed August 14, 2000, File No. 000-21379)

+10.48    Development and Supply Agreement dated April 3, 2000, by and between
          Cubist and Abbott Laboratories (Exhibit 10.3, Quarterly Report on Form
          10-Q, filed August 14, 2000, File No. 000-21379)

10.49     Clinical Services Master Agreement, dated December 1, 1999, by and
          between Cubist and Omnicare Clinical Research, Inc. f/k/a IBAH, Inc.

10.50     Exhibit A to the Clinical Services Master Agreement, dated
          December 21, 2000, by and between Cubist and Omnicare Clinical
          Research, Inc. f/k/a IBAH, Inc.

10.51     Exhibit B to the Clinical Services Master Agreement, dated
          April 12, 2000, by and between Cubist and Omnicare Clinical Research,
          Inc. f/k/a IBAH, Inc.

10.52     Exhibit C to the Clinical Services Master Agreement, dated
          April 18, 2000, by and between Cubist and Omnicare Clinical Research,
          Inc. f/k/a IBAH, Inc.

10.53     Exhibit D to the Clinical Services Master Agreement, dated
          May 10, 2000, by and between Cubist and Omnicare Clinical Research,
          Inc. f/k/a IBAH, Inc.

10.54     Exhibit E to the Clinical Services Master Agreement, dated
          October 17, 2000, by and between Cubist and Omnicare Clinical
          Research, Inc. f/k/a IBAH, Inc.

10.55     Contract of Monitoring Services dated, January 10, 2000, between
          Cubist and Clindev (Proprietary) Limited

10.56     First Amendment to Contract of Monitoring Services, dated
          June 22, 2000, between Cubist and Clindev (Proprietary) Limited

10.57     Second Amendment to Contract of Monitoring Services, dated
          December 20, 2000, between Cubist and Clindev (Proprietary) Limited

10.58     Contract Research Agreement, dated as of August 1, 2000, by and
          between Target Research Associates, Inc. and Cubist

10.59     Assignment and License Agreement, dated October 6, 2000, by and
          between Eli Lilly & Company and Cubist

10.60     Note Purchase Agreement, dated September 8, 2000, by and between
          Cubist and the Purchasers listed on Schedule 1 thereto

10.61     Registration Rights Agreement, dated as of September 8, 2000, by and
          between John Hancock Life Insurance Company, John Hancock Variable
          Life Insurance Company, Signature 4 Limited, Investors Partner Life
          Insurance Company and Cubist

10.62     Senior Convertible Promissory Note R-1, dated September 8, 2000, by
          and between Cubist and John Hancock Life Insurance Company

10.63     Senior Convertible Promissory Note R-2, dated September 8, 2000, by
          and between Cubist and John Hancock Life Insurance Company

10.64     Senior Convertible Promissory Note R-3, dated September 8, 2000, by
          and between Cubist and John Hancock Life Insurance Company

10.65     Senior Convertible Promissory Note R-4, dated September 8, 2000, by
          and between Cubist and John Hancock Variable Life Insurance Company


<PAGE>
                                      -68-




10.66     Senior Convertible Promissory Note R-5, dated September 8, 2000, by
          and between Cubist and Hare & Co.

10.67     Senior Convertible Promissory Note R-6, dated September 8, 2000, by
          and between Cubist and Investors Partner Life Insurance Company

10.68     Research & Development Collaboration and Option Agreement, dated as
          of October 4, 2000, by and between Cubist and Emisphere Technologies,
          Inc.

10.69     License Agreement, dated as of November 22, 2000, by and between
          Cubist and International Health Management Associates, Inc.

10.70     Patent Cross-License Agreement, dated as of November 18, 1999, by and
          between TerraGen Discovery Inc. and Diversa Corporation

10.71     Convertible Promissory Note, dated as of April 8, 1999, by and
          between TerraGen Diversity Inc. and Xenova Discovery Limited

10.72     Audit Committee Charter

10.73     Fourth Amendment to Amended and Restated 1993 Stock Option Plan

10.74     Fifth Amendment to Amended and Restated 1993 Stock Option Plan

10.75     Sixth Amendment to Amended and Restated 1993 Stock Option Plan

10.76     Cubist Pharmaceuticals, Inc. 2000 Nonstatutory Stock Option Plan

23.1      Consent of PricewaterhouseCoopers LLP

23.2      Consent of KPMG LLP
- -------------------------------
Unless otherwise indicated, all of the above-listed Exhibits are incorporated by
reference from the Company's filing indicated.

+ Confidential Treatment granted: Omitted portions filed separately with the
Commission.


<PAGE>
                                      -69-



                                   SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this amendment to be signed
on its behalf by the undersigned, thereunto duly authorized.


                          CUBIST PHARMACEUTICALS, INC.


                          By: /s/ Scott M. Rocklage
                             --------------------------------------------
                             Scott M. Rocklage, Ph.D.
                             Chairman of the Board of Directors and Chief
                               Executive Officer

     Pursuant to the requirements of the Exchange Act of 1934, this report has
been signed by the following persons in the capacities and on the dates
indicated.

<TABLE>
<CAPTION>
                SIGNATURE                                       TITLE                          DATE
<S>                                      <C>                                             <C>
  /s/ Scott M. Rocklage                   Chairman of the Board of Directors, Chief       March 30, 2001
 ------------------------------------     Executive Officer and Director
 Scott M. Rocklage                        (Principal Executive Officer)

  /s/ Thomas A. Shea                      Vice President and Chief Financial Officer      March 30, 2001
 ------------------------------------
 Thomas A. Shea

                                          Director                                        March ___, 2001
 ------------------------------------
 Susan Bayh

  /s/ Barry M. Bloom                      Director                                        March 29, 2001
 ------------------------------------
 Barry M. Bloom

  /s/ John K. Clarke                      Director                                        March 30, 2001
 ------------------------------------
 John K. Clarke

  /s/ David Martin                        Director                                        March 29, 2001
 ------------------------------------
 David Martin

  /s/ Walter Maupay                       Director                                        March 30, 2001
 ------------------------------------
 Walter Maupay

                                          Director                                        March ___, 2001
 ------------------------------------
 Paul R. Schimmel

  /s/ John Zabriskie                      Director                                        March 30, 2001
 ------------------------------------
 John Zabriskie
</TABLE>

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.49
<SEQUENCE>2
<FILENAME>a2042768zex-10_49.txt
<DESCRIPTION>EXHIBIT 10.49
<TEXT>

<PAGE>

                                                                   EXHIBIT 10.49

                             CONFIDENTIAL TREATMENT

                       CLINICAL SERVICES MASTER AGREEMENT


          THIS CLINICAL SERVICES MASTER AGREEMENT (this "MASTER AGREEMENT") is
entered into as of this 1st day of December, 1999 by and between CUBIST
PHARMACEUTICALS, INC. ("SPONSOR"), and IBAH, INC. ("IBAH"), a Delaware
corporation.

          WHEREAS, Sponsor requires various clinical research services from time
to time in support of various projects (individually, a "Project," and
collectively, the "Projects"), which shall be set forth in Exhibits to this
Master Agreement: and

          WHEREAS, IBAH is engaged in the business of providing such services;

          NOW, THEREFORE, for good and valuable consideration, AND INTENDING TO
BE LEGALLY BOUND, Sponsor and IBAH hereby agree as follows:

1.       SCOPE OF MASTER AGREEMENT; OBLIGATIONS

         1.1.     The specific responsibilities and obligations to be performed
                  by IBAH with respect to a Project (the "SERVICES"), as set
                  forth in the applicable Protocol(s), are expressly set forth
                  in Exhibit(s) attached to this Master Agreement, which,
                  together with the Schedule(s) attached hereto, are
                  incorporated by reference herein. The responsibility for the
                  Services is being transferred to IBAH in accordance with 21
                  C.F.R. Section 312.52. Those responsibilities and obligations
                  not specifically transferred to and assumed by IBAH in this
                  Master Agreement or the Exhibit(s) as constituting part of the
                  Services shall be and remain the sole responsibility of
                  Sponsor.

         1.2.     IBAH agrees to provide the Services in accordance with (a) all
                  applicable federal laws and regulations, including standards
                  of Good Clinical Practices; and (b) the standards and
                  practices that are generally accepted in the industry and
                  exercised by other persons engaged in performing similar
                  services.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -2-


2.       PAYMENT

         2.1.     In consideration of the Services, Sponsor shall pay to IBAH:
                  (a) the Service Fees (as defined in SECTION 2.2); and (b) the
                  Pass-Through Costs (as defined in SECTION 2.3).

         2.2.     As used in this Master Agreement, the term "SERVICE FEES"
                  means all amounts due for the Services, exclusive of the
                  Pass-Through Costs. The estimated Service Fees and the payment
                  schedule therefor are set forth in the Schedule(s) and the
                  Exhibit(s), and shall be increased to include: (a) the costs
                  of any additional Services required as a result of Project
                  changes by Sponsor; and (b) where a Project requires more time
                  than allotted in the Exhibit(s), and the parties agree to
                  continue such Project beyond the expected conclusion date, any
                  additional costs that may be incurred in order to complete
                  such Project, at the contractual rates set forth in the
                  applicable Exhibit(s).

         2.3.     As used in this Master Agreement, the term "PASS-THROUGH
                  COSTS" means all investigator, Institutional Review Board or
                  other applicable pass-through costs actually incurred by IBAH
                  under this Master Agreement or the Exhibit(s) in order to
                  expedite successful completion of a Project, which costs are
                  normal and routine to studies similar to such Project (e.g.,
                  advancing an investigator's Institutional Review Board fee or
                  reimbursing reasonable additional, unbudgeted patient
                  expenses). In order to enable IBAH to maintain a balance to be
                  applied towards all Pass-Through Costs, IBAH shall invoice
                  Sponsor for all reasonably anticipated Pass-Through Costs (the
                  "ESTIMATED PASS-THROUGH COSTS") in advance of the expected
                  payment date therefor.

         2.4.     Notwithstanding anything contained herein to the contrary, the
                  estimated Service Fees set forth in the Exhibit(s) shall
                  remain in effect for [ ]*. Thereafter, IBAH reserves the right
                  [ ]*.

3.       CONFIDENTIALITY

         3.1.     That certain Confidentiality Agreement by and between IBAH and
                  Sponsor dated October 18, 1999 (the "CONFIDENTIALITY
                  AGREEMENT") is hereby terminated and of no further force or
                  effect.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -3-


         3.2.     In connection with the performance of the Services, Sponsor
                  shall provide to IBAH, and IBAH shall have access to,
                  Sponsor's Confidential Information. As used in this Master
                  Agreement, "SPONSOR'S CONFIDENTIAL INFORMATION" means any (a)
                  information provided by, or developed for, Sponsor within the
                  framework of this Master Agreement, the Schedule(s), the
                  Exhibit(s) or the Confidentiality Agreement; or (b) data
                  collected during a Project.

         3.3.     In connection with this Master Agreement, Sponsor will have
                  access to, or become acquainted with, IBAH's Confidential
                  Information. As used in this Master Agreement, "IBAH'S
                  CONFIDENTIAL INFORMATION" means any (a) information generated
                  or obtained in connection with IBAH's pricing, proposals or
                  contracts (including the provisions of this Master Agreement,
                  the Schedule(s) and the Exhibit(s)); (b) of IBAH's procedures,
                  programs, guidelines or policies (including, without
                  limitation, its Standard Operating Procedures); or (c)
                  information designated in writing as "confidential."

         3.4.     Neither Sponsor's Confidential Information nor IBAH's
                  Confidential Information (collectively, "CONFIDENTIAL
                  INFORMATION") shall include any information that:

                  (a)      was known by the receiving party at the time of
                           disclosure to it by the disclosing party, or that is
                           independently developed or discovered by the
                           receiving party, after disclosure by the disclosing
                           party, without the aid, application or use of any
                           item of the disclosing party's Confidential
                           Information, as evidenced by written records;

                  (b)      is now or subsequently becomes, through no act or
                           failure to act on the part of the receiving party,
                           generally known or available;

                  (c)      is disclosed to the receiving party by a third party
                           authorized to disclose it; or

                  (d)      is required by law or by court or administrative
                           order to be disclosed; provided, that the receiving
                           party shall have first given prompt notice to the
                           other party of such required disclosure.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -4-


         3.5.     Each party shall exercise due care to prevent the unauthorized
                  use or disclosure of the other party's Confidential
                  Information, and shall not, without the other party's prior
                  written consent, (a) use the other party's Confidential
                  Information for any purpose other than performing its
                  obligations under this Master Agreement and the Exhibit(s); or
                  (b) disclose or otherwise make available, directly or
                  indirectly, any item of the other party's Confidential
                  Information to any person or entity other than those
                  employees, independent contractors, agents or investigators of
                  such party and/or its affiliated entities (collectively,
                  "REPRESENTATIVES") who reasonably need to know the same in the
                  performance of such party's obligations under this Master
                  Agreement (including the Schedule(s) and the Exhibit(s)), or
                  in order to make decisions or render advice in connection
                  therewith. For the convenience of the parties, each party
                  acknowledges that unless precluded in writing by the other
                  party, Confidential Information may be transmitted to a party
                  and/or its Representatives via the Internet. Each party shall
                  advise its Representatives who have access to the other
                  party's Confidential Information of the confidential nature
                  thereof, and agrees that such Representatives will be bound by
                  terms of confidentiality and restrictions on use with respect
                  thereto that are at least as restrictive as the terms of this
                  SECTION 3.

         3.6.     The provisions of this SECTION 3 shall survive for a period of
                  five (5) years from the date of any expiration or termination
                  of this Master Agreement, however caused.

4.       PROPERTY OF SPONSOR

         4.1.     All (a) of Sponsor's Confidential Information (including,
                  without limitation, all original Project records and reports),
                  (b) unused clinical supplies provided by Sponsor, and (c)
                  complete and incomplete Case Report Forms, which in any case
                  are in IBAH's possession, shall be and remain Sponsor's
                  property; PROVIDED, HOWEVER, that IBAH-may retain one copy of
                  Sponsor's Confidential Information in its files for archival
                  purposes, as a means of determining any continuing obligations
                  under this Master Agreement (including the Schedule(s) and the
                  Exhibit(s)).

         4.2.     All inventions, improvements in know-how, new uses, processes
                  and compounds involving the study drug(s) and/or product(s)

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -5-


                  covered by this Master Agreement and/or the Exhibit(s) that
                  are conceived or reduced to practice as a direct result of the
                  Project(s) ("INVENTIONS") shall be and remain the sole
                  property of Sponsor. IBAH shall cooperate fully with Sponsor
                  in obtaining, at Sponsor's sole cost and expense, any patent
                  protection as may be available for the Inventions, and shall
                  execute all documents reasonably deemed necessary by Sponsor
                  for purposes of procuring such patent protection. IBAH agrees
                  that it shall endeavor to ensure contractually the prompt
                  disclosure to Sponsor by any investigator, employee or other
                  individual retained by IBAH for a Project of any Inventions,
                  as well as the cooperation of such persons in securing patent
                  protection as set forth herein.

         4.3.     Notwithstanding the foregoing, Sponsor acknowledges that IBAH
                  and its professional staff currently possess certain
                  inventions, processes, know-how, trade' secrets, methods,
                  approaches, analyses, improvements, other intellectual
                  properties and other assets including, but not limited to,
                  clinical trial management analyses, analytical methods,
                  procedures and techniques, computer technical expertise and
                  proprietary software, and technical and conceptual expertise
                  in the area of conducting clinical trials, all of which have
                  been developed independently by IBAH without the benefit of
                  any information provided by Sponsor (collectively, "IBAH
                  PROPERTY"). Sponsor agrees that any IBAH Property which is
                  used, improved, modified or developed by IBAH under or during
                  the term of this Master Agreement shall be and remain the sole
                  and exclusive property of IBAH.

5.       RESTRICTIONS ON ANNOUNCEMENTS

IBAH shall not make any announcement, oral presentation or publication relating
to any Project without Sponsor's prior written consent (which consent shall not
be unreasonably withheld), except as required by law or by court or
administrative order. Neither party shall employ or use the name of the other
party in any publication or promotional material or in any form for public
distribution, without the prior written consent of the other party, except as
required by law or by court or administrative order.

6.       FDA INSPECTION

In the event that IBAH receives a Notice of Inspection (a "NOTICE") from the
Food and Drug Administration ("FDA") which relates to any Project, IBAH

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -6-


shall: (a) notify Sponsor promptly of such Notice; (b) keep Sponsor informed of
the progress of the inspection; and (c) provide to Sponsor a copy of any
documents produced to the FDA pursuant to such Notice. Sponsor acknowledges that
it is IBAH's obligation to respond to a Notice directed to IBAH.

7.       ACCESS TO FACILITIES

Sponsor's authorized representatives may visit IBAH's site and facilities at
reasonable times and with reasonable frequency during normal business hours and
upon reasonable advance written notice, to observe the progress of any Services.
All such visits shall be subject to IBAH's restrictions and procedures relating
to safety, security and protection of Confidential Information, and in
connection therewith, Sponsor's authorized representatives may be required to
sign a confidentiality agreement, or an access agreement for special
access-controlled areas.

8.       INDEMNIFICATION

         8.1      Sponsor shall defend, indemnify and hold harmless IBAH, its
                  affiliated entities, and their respective trustees, officers,
                  agents and employees from any and all losses, costs, expenses,
                  liabilities, claims, actions and damages, directly related to
                  the conduct of the clinical trial and/or IBAH's performance of
                  the services provided under this Agreement, subject to the
                  restrictions set forth in Sections 8.2 and 8.3 below.

         8.2      The above obligation of Sponsor shall not apply nor shall
                  Sponsor be liable for any indemnification or expenses, and in
                  fact, IBAH shall defend, indemnify, and hold harmless Sponsor,
                  for actions or claims in any way arising from or caused by the
                  willful, reckless, or negligent acts or omissions, of IBAH or
                  any of their agents or employees, or arising from or caused by
                  any of their failures to comply strictly with the Protocol,
                  with good clinical practices, with Sponsor's written
                  recommendations and instructions relative to the conduct of
                  the applicable clinical trial, or with any applicable FDA or
                  other governmental requirements or law.

         8.3      The obligation of the indemnifying party hereunder shall apply
                  only if the other party provides prompt written notification
                  upon receipt of notice of any claim or suit, (provided,
                  however, that neither party shall be released from its
                  obligations under this Section 8 if the failure to promptly
                  notify the other party does

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -7-


                  not materially prejudice the defense of any claim), permits
                  the indemnifying party and its attorneys and personnel to
                  handle and control the defense of such claims or suits,
                  including pretrial, trial or settlement, and the indemnified
                  party fully cooperates and assists in such defense. The
                  indemnified party further agrees that it will not settle or
                  compromise any such claim or suit without the prior written
                  consent of the indemnifying party.

         8.4      The indemnifying parties shall secure and maintain in full
                  force and effect through the performance of the applicable
                  Study (and following termination of the applicable Study to
                  cover any claims arising from the applicable Study) insurance
                  coverage in amounts appropriate to the conduct of the parties
                  business activities and the services contemplated by the
                  applicable Study, and shall provide evidence of insurance
                  coverage in an acceptable form upon request.

9.       TERMINATION

         9.1.     Either party may terminate this Master Agreement and/or any
                  Exhibit at any time and for any reason upon a minimum of [ ']*
                  prior notice. Upon any such early termination, Sponsor shall
                  pay to IBAH all Service Fees and Pass-Through Costs due and
                  owing based upon Services completed and costs incurred through
                  the effective date of termination, including costs for
                  materials and/or services previously acquired or contracted
                  for which will not be used for the Services as a result of
                  such termination.

         9.2.     Any funds held by IBAH which by contract definition or
                  amendment are deemed unearned (including, without limitation,
                  any Estimated Pass-Through Costs not used to satisfy
                  Pass-Through Costs) shall be returned to Sponsor within [ ]*
                  after conclusion of the Project(s) set forth in the applicable
                  Exhibit(s).

         9.3.     Following completion or termination of any Project, IBAH shall
                  forward all original Project records and reports to Sponsor
                  (or to a repository designated by Sponsor in writing) at
                  Sponsor's sole cost and expense. Thereafter, IBAH shall retain
                  any documentation related to such Project in compliance with
                  IBAH's corporate policy on retention and destruction of
                  records.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -8-


10.      FORCE MAJEURE

If either party's performance of this Master Agreement or any Exhibit is
prevented, restricted or delayed (either totally or in part) by reason of any
cause beyond the reasonable control of the parties, such as acts of God,
explosion, disease, weather, war, insurrection, civil strike, riot or power
failure, the party so affected shall, upon giving notice thereof to the other
party, be excused from such performance to the extent of such prevention,
restriction or delay; PROVIDED, that the affected party shall use its
commercially reasonable efforts to avoid or remove such causes of
non-performance and shall continue performance with the utmost dispatch whenever
such causes are removed; and PROVIDED FURTHER, that nothing herein shall relieve
either party from the obligation to pay promptly in full all payments that may
be due to the other party under this Master Agreement or the Exhibit(s).

11.      NO CONFLICT

Each party represents and warrants that it is authorized to enter into this
Master Agreement and that the terms hereof are not inconsistent with or a
violation of any contractual or other legal obligation to which it is subject.

12.      LIMITATIONS

         12.1.    Sponsor acknowledges that the results of the Project(s) are
                  inherently uncertain and that, accordingly, there can be no
                  assurance, representation or warranty by IBAH that the study
                  drug(s) and/or product(s) covered by this Master Agreement
                  and/or the Exhibit(s) can, either during the term of this
                  Master Agreement or thereafter, be developed successfully or,
                  if so developed, will receive the required approval(s) from
                  the FDA or other regulatory agency or authority.

         12.2.    Both parties acknowledge that the Services constitute research
                  and development. Accordingly, Sponsor's sole remedy for any
                  breach or default hereof by IBAH shall be termination of this
                  Master Agreement or the applicable Exhibit as herein provided
                  or a return of any Service Fees and unexpended Pass Through
                  costs paid to IBAH for Services improperly performed or not
                  performed. In no event shall IBAH be liable for any special,
                  indirect, incidental or consequential damages (whether in
                  contract or tort).

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -9-


13.      NON-DEBARMENT

         13.1.    IBAH represents and warrants that IBAH has never been and is
                  not currently:

                  (a)      an individual who has been debarred by the FDA
                           pursuant to 21 U.S.C. Section 335a (a) or (b)
                           (a "DEBARRED INDIVIDUAL") from providing services in
                           any capacity to a person that has an approved or
                           pending drug product application, or an employer,
                           employee or partner of a Debarred Individual; or

                  (b)      a corporation, partnership, or association that has
                           been debarred by the FDA pursuant to 21 U.S.C.
                           Section 335a (a) or (b) (a "DEBARRED ENTITY") from
                           submitting or assisting in the submission of an
                           abbreviated new drug application, or an employee,
                           partner, shareholder, member, subsidiary or affiliate
                           of a Debarred Entity.

         13.2.    IBAH further represents and warrants that IBAH has no
                  knowledge of any circumstances which may affect the accuracy
                  of the representations and warranties set forth in SECTION
                  13.1 including, but not limited to, FDA investigations of, or
                  debarment proceedings against, IBAH or any person or entity
                  performing, or rendering assistance related to, the Services.
                  IBAH will notify Sponsor promptly upon becoming aware of any
                  such circumstances during the term of this Master Agreement.

14.      INDEPENDENT CONTRACTOR

The status of the parties under this Master Agreement is that of independent
contractors, and, except as specifically set forth herein, or in the Schedule(s)
or the Exhibit(s), neither party has any authority to bind or act on behalf of
the other party without its express written consent.

15.      NOTICES

Any notices, requests or other communications given under this Master Agreement
shall be in writing and shall be given by personal delivery, or sent by (a)
facsimile transmission (with message confirmed during normal business hours);
(b) first class mail, postage prepaid; or (c) Federal Express (or equivalent
nationally recognized overnight delivery service), delivery charges prepaid. All
notices shall be given to a party at its respective address set forth below, or
at such other address as such party from time to time may

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -10-


specify by notice in accordance with this SECTION 15. A notice shall be deemed
given when actually received; PROVIDED, that if any facsimile notice is received
after 5:00 P.M. local time at the place of receipt, it shall be deemed to have
been given as of the next following business day.

         If to IBAH:                   IBAH, Inc.
                                       Four Valley Square
                                       512 Township Line Road
                                       Blue Bell, PA 19422
                                       Attention: Controller, U.S. CRO

         If to Sponsor:                Cubist Pharmaceuticals, Inc.
                                       24 Emily Street
                                       Cambridge, MA 02139
                                       Attention: David P. Graham

16.      ENTIRE AGREEMENT

This Master Agreement, together with all corresponding Schedules, Exhibits,
Amendments or Change Orders, constitutes the entire agreement between Sponsor
and IBAH with respect to the subject matter hereof, and replaces and supersedes
any and all prior and contemporaneous agreements and/or understandings, whether
oral or written, between Sponsor and IBAH with respect to the subject matter
hereof. This Master Agreement (including the Schedule(s) and the Exhibit(s)) may
be amended or modified only by a written instrument executed by a duly
authorized officer of each party.

17.      CONSTRUCTION OF AGREEMENT

The descriptive headings of the Sections of this Master Agreement are for
convenience only and shall not affect the meaning or construction of any of the
provisions of this Master Agreement. The failure of either party to enforce any
provision of this Master Agreement (including the Schedule(s) and/or the
Exhibit(s)) shall not be construed as a waiver or limitation of that party's
subsequent rights to enforce and compel strict compliance with every provision
of this Master Agreement. To the extent any provision of this Master Agreement
or the application thereof is found by a proper authority to be invalid or
unenforceable, it shall be considered deleted herefrom, and the remainder of
this Master Agreement shall continue in full force and effect.

This Master Agreement shall be governed by and construed in accordance with the
laws of the Commonwealth of Pennsylvania, without regard to provisions of
conflicts of law. Any lawsuit arising from or related to this Master Agreement
shall be brought exclusively before the United States

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -11-


District Court for the Eastern District of Pennsylvania or any Commonwealth
court sitting in Montgomery County, Pennsylvania, and each party hereby consents
to the jurisdiction of any such court.

18.      ASSIGNMENT

Neither Sponsor nor IBAH may assign this Master Agreement or any rights
hereunder or delegate the performance of any duties hereunder without the prior
written approval of the other party, which approval shall not be unreasonably
delayed or withheld; PROVIDED, HOWEVER, that without such consent, either party
may assign this Master Agreement in connection with the transfer or sale of all
or substantially all of its assets, stock or business, or its merger,
consolidation or combination with or into another entity. Subject to the
foregoing, this Master Agreement shall be binding upon, inure to the benefit of
and be enforceable by the parties and their respective successors and permitted
assigns.

19.      SURVIVAL

Any terms of this Master Agreement which by their nature extend beyond its
performance, expiration or termination (including, without limitation, SECTIONS
2 through 5, 8 through 10, 12 and this SECTION 19) shall remain in effect
indefinitely until fulfilled in accordance with their terms.

20.      SIGNATORIES

This Master Agreement may be executed in counterparts, each of which, when
executed and delivered, shall be deemed to be an original, and all of which,
when joined, shall together constitute one and the same agreement. Any photocopy
or facsimile of this Master Agreement, or of any counterpart, shall be deemed
the equivalent of an original.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>
                                      -12-


         IN WITNESS WHEREOF, the parties have executed this Master Agreement by
their duly authorized officers as of the date first above written.

CUBIST PHARMACEUTICALS, INC.                       IBAH, INC.

By: /s/ FRANCIS P. TALLY, M.D.                     By: /s/ LEONARD F. STIGLIANO
   -----------------------------                      -------------------------

Name:  Francis P. Tally, M.D.                      Name:  Leonard F. Stigliano

Title:  Ex. VP Scientific Affairs                  Title:  President, US. CRO

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.50
<SEQUENCE>3
<FILENAME>a2042768zex-10_50.txt
<DESCRIPTION>EXHIBIT 10.50
<TEXT>

<PAGE>

                                                                   EXHIBIT 10.50

                             CONFIDENTIAL TREATMENT


               EXHIBIT A TO THE CLINICAL SERVICES MASTER AGREEMENT
              BETWEEN CUBIST PHARMACEUTICALS, INC. AND IBAH, INC.,
                            DATED DECEMBER 21, 1999.

         THIS EXHIBIT A is entered into this 21st day of December, 1999, by and
between Cubist Pharmaceuticals, Inc. (hereinafter "Cubist") and IBAH, Inc.
(hereinafter "IBAH").

         WHEREAS, Cubist and IBAH entered into a Clinical Services Master
Agreement, dated December 1, 1999 (hereinafter the "Master Agreement"), wherein
IBAH agreed to provide clinical services and;

         WHEREAS, Cubist and IBAH agree that IBAH shall provide the services set
forth in this Exhibit A, subject to the terms and conditions set forth in the
Master Agreement;

         NOW, THEREFORE, for good and valuable consideration, and INTENDING TO
BE LEGALLY BOUND, Cubist and IBAH agree as follows:

Based on the Project Specifications, IBAH has provided a description of services
to be performed for the Daptomycin Program (hereinafter "the Project") and
associated costs. Changes made in the Project scope, at any time during the
Project, will result in a corresponding adjustment to the Project costs.

 I.      PROGRAM PLAN

 A.      PROGRAM STATUS TABLE

[  ]*

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>


II.      PROJECT ROLES AND RESPONSIBILITIES

<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------
                                     TASK                                              CUBIST               IBAH
- ------------------------------------------------------------------------------------------------------------------------
<S>                                                                                 <C>                  <C>

- ------------------------------------------------------------------------------------------------------------------------
A.       STUDY MANAGEMENT
- ------------------------------------------------------------------------------------------------------------------------
      1. Facilitate Project Management                                                                       X
         o  [   ]*
         o  International Project Manager [   ]*
- ------------------------------------------------------------------------------------------------------------------------
      2. Manage [   ]* Clindev sites in South Africa                                                         X
- ------------------------------------------------------------------------------------------------------------------------
      3. Coordinate and conduct team meetings                                            X                   X
- ------------------------------------------------------------------------------------------------------------------------
      4. Standard Operating Procedures (SOPS)                                                                X
- ------------------------------------------------------------------------------------------------------------------------
      5. Performance tracking                                                            X                   X
- ------------------------------------------------------------------------------------------------------------------------
      6. Monitor Project payment schedule                                                X                   X
- ------------------------------------------------------------------------------------------------------------------------
      7. Project problem solving                                                         X                   X
- ------------------------------------------------------------------------------------------------------------------------
      8. Clerical and administrative support                                                                 X
- ------------------------------------------------------------------------------------------------------------------------
B.       CLINICAL TRIAL INITIATION
- ------------------------------------------------------------------------------------------------------------------------
      1. Drug development and study design                                               X
- ------------------------------------------------------------------------------------------------------------------------
      2. Patient plan                                                                    X
         o  CSSTI-[   ]* patients enrolled each U.S./International
            ([   ]* patients total)
         o  RRC (Companion) [   ]* patients U.S./ [   ]* International
            ([   ]* patients total)
         o  Bacteremia [   ]* patient U.S.
- ------------------------------------------------------------------------------------------------------------------------
      3. Site plan                                                                                           X
         o  Up to [   ]* additional Sites U.S.
         o  [   ]*
- ------------------------------------------------------------------------------------------------------------------------
      4. CRF design                                                                      X
         o  CSSTI -[   ]* estimated pages
         o  RRC -[   ]* estimated pages
         o  Bacteremia -[   ]* estimated pages
- ------------------------------------------------------------------------------------------------------------------------
      5. CRF logistics (print, bind, and distribute)                                                         X
         o  Material, printing and assembly expenses will be passed
            through at cost
- ------------------------------------------------------------------------------------------------------------------------
      6. Investigator identification, recruitment and qualification                                          X
- ------------------------------------------------------------------------------------------------------------------------
      7. Investigator regulatory document management                                                         X
         o  Protocol Amendments and IRB submissions billed per site
         o  Informed Consent Forms development
- ------------------------------------------------------------------------------------------------------------------------
      8. Certification of Investigator Financial Disclosure                                                  X
- ------------------------------------------------------------------------------------------------------------------------
      9. Investigator agreement negotiation                                                                  X
- ------------------------------------------------------------------------------------------------------------------------
     10. Coordination of investigators meeting                                                               X
         o  One meeting US; three meetings International
- ------------------------------------------------------------------------------------------------------------------------
     11. Project team training                                                           X                   X
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>
                                      -2-


<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------
                                     TASK                                              CUBIST               IBAH
- ------------------------------------------------------------------------------------------------------------------------
<S>                                                                                 <C>                  <C>

- ------------------------------------------------------------------------------------------------------------------------
C.       CLINICAL TRIAL MANAGEMENT
- ------------------------------------------------------------------------------------------------------------------------
      1. Clinical monitoring                                                                                 X
         o  IBAH estimates use [   ]* pre-qualified sites (U.S.)
            [   ]*
         o  (U.S.) and 25 (International) one-day qualification visits
         o  IBAH estimates performance of [   ]* U.S. and [   ]*
            International initiation visits ([   ]* visits total)
         o  IBAH estimates performance of [   ]* U.S. and [   ]*
            International interim visits ([   ]* visits total)
         o  IBAH estimates performance of [   ]* U.S. and [   ]*
            International drug accountability visits ([   ]* visits total)
         o  IBAH estimates [   ]* U.S. and [   ]* International close-out
            visits [   ]* visits total
- ------------------------------------------------------------------------------------------------------------------------
      2. Clinical grant payment administration                                                               X
- ------------------------------------------------------------------------------------------------------------------------
      3. CRF tracking, filing and archiving                                                                  X
         o  CSSTI- [   ]* each US/International CRF pages
            ([   ]* pages total)
         o  RRC- [   ]* US/[   ]* International CRF pages
            ([   ]* pages total)
         o  Bacteremia- [   ]* CRF Pages
- ------------------------------------------------------------------------------------------------------------------------
      4. Medical monitoring                                                                                  X
         o  [   ]*
- ------------------------------------------------------------------------------------------------------------------------
      5. Safety review of CRFs                                                                               X
         o  Based on [   ]* cases reviewed
- ------------------------------------------------------------------------------------------------------------------------
      6. SAE Reporting                                                                                       X
         o  CSSTI U.S. [   ]*
         o  RRC U.S. [   ]*
         o  Bacteremia [   ]*
- ------------------------------------------------------------------------------------------------------------------------
D.       CLINICAL DATA MANAGEMENT
- ------------------------------------------------------------------------------------------------------------------------
      1. Project database creation and data entry                                                            X
         Fee based on
         o  CSSTI- [   ]* CRF pages each US/International [   ]*
         o  RRC- [   ]* CRF pages US/[1950]* International [   ]*
         o  Bacteremia -[   ]* CRF pages
- ------------------------------------------------------------------------------------------------------------------------
      2. Case report form review and query resolution                                                        X
         Fee based on:
         o  CSSTI- [   ]* CRF pages each US/International [   ]*
         o  RRC- [   ]* CRF pages US/[   ]* International [   ]*
         o  Bacteremia -[   ]* CRF pages
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>


*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -3-



<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------
                                     TASK                                              CUBIST               IBAH
- ------------------------------------------------------------------------------------------------------------------------
<S>                                                                                 <C>                  <C>
- ------------------------------------------------------------------------------------------------------------------------
      3. Dictionary processing                                                                               X
- ------------------------------------------------------------------------------------------------------------------------
      4. Laboratory data processing (central)                                                                X
         IBAH will use Covance as central lab
- ------------------------------------------------------------------------------------------------------------------------
      5. Data transfer (standard)                                                                            X
- ------------------------------------------------------------------------------------------------------------------------
      6. Data security procedures                                                                            X
- ------------------------------------------------------------------------------------------------------------------------
      7. GCP audit of final database                                                                         X
- ------------------------------------------------------------------------------------------------------------------------
E.       BIOMETRIC ANALYSIS
- ------------------------------------------------------------------------------------------------------------------------
      1. Statistical analysis plan-one major one minor revision for each                                     X
         o  CSSTI- U.S.
         o  CSSTI-International
         o  RRC-U. S.
         o  RRC-International
         o  Bacteremia-U.S.
- ------------------------------------------------------------------------------------------------------------------------
      2. Randomization                                                                   X
         o  3rd Party IVRS
- ------------------------------------------------------------------------------------------------------------------------
      3. Project data setup and programming of displays                                                      X
         o  CSSTI- [   ]* primary tables and listings and [   ]*
            secondary tables and listing U.S. and [   ]* secondary tables
            and listings International
         o  RRC- [   ]* primary tables and listings and [   ]* secondary
            tables and listing U.S. and [   ]* secondary tables and listings
            International
         o  Bacteremia [   ]* primary tables and listings and [   ]*
            secondary tables and listing
- ------------------------------------------------------------------------------------------------------------------------
      4. Quality control procedures for displays                                                             X
- ------------------------------------------------------------------------------------------------------------------------
      5. Patient evaluability and outcome assessment                                                         X
- ------------------------------------------------------------------------------------------------------------------------
      6. Interim transfer of listings                                                                        X
- ------------------------------------------------------------------------------------------------------------------------
      7. Final statistical analysis                                                                          X
- ------------------------------------------------------------------------------------------------------------------------
      8. Statistical support for table preparation                                                           X
- ------------------------------------------------------------------------------------------------------------------------
      9. Data loading and review                                                                             X
- ------------------------------------------------------------------------------------------------------------------------
     10. Statistical report                                                                                  X
- ------------------------------------------------------------------------------------------------------------------------
     11. GCP compliance audit of final tables and listings                                                   X
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -4-


<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------
                                     TASK                                              CUBIST               IBAH
- ------------------------------------------------------------------------------------------------------------------------
<S>                                                                                 <C>                  <C>
- ------------------------------------------------------------------------------------------------------------------------
F.       CLINICAL WRITING
- ------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------
      1. Phase II clinical Study report-Bacteremia, RRC(NA), RRC(Companion)                                  X
         o  One major [   ]* and one minor [   ]* revision and up to
            [   ]* brief patient narratives
         o  Fee does not include collation or compilation of appendices

         Phase III clinical study report-CSSTI(NA), CSSTI (International),
         o  One major [   ]* and one minor [   ]* revision and up to
            [   ]* brief patient narratives
         o  Fee does not include collation or compilation of appendices
- ------------------------------------------------------------------------------------------------------------------------
      2. GCP audit of final clinical study report                                                            X
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>
                                      -5-



III.     PROJECT TIMELINE

This Project is estimated to start on or about [   ]*. The projected timeline
for this Project is as follows:

         [   ]*


*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>
                                      -6-



IV.      IBAH SERVICES

A.       STUDY MANAGEMENT

         1.       GLOBAL PROGRAM DIRECTOR/INTERNATIONAL PROJECT MANAGER

IBAH's Global Program Director will coordinate the services being provided by
all of the disciplines within IBAH and will act as a single point of contact for
Cubist until the completion of the Project. The International Project Manager,
working in conjunction with the Global Program Director, will manage the
international segment of the Project.

Key responsibilities of these individuals will include the following:

         o        Prepare detailed Project timelines and ensuring that the major
                  milestones are met

         o        Provide Project status updates at a frequency directed by
                  Cubist

         o        Identify and resolve critical Project issues

         o        Ensure adequate resource allocation across all functions

         o        Oversee Project team meetings

         o        Manage Project financial issues

         2.       COUNTRY TRIAL MANAGERS

IBAH's Country Trial Managers will be dedicated to managing the day-to-day
clinical trial activity. They will oversee all site and CRA activities within
this Project.

Primary responsibilities of these individuals will include the following:

         o        Develop case report forms and monitoring guidelines

         o        Oversee regulatory document management from each of the
                  investigational sites

         o        Review and track CRA activities including scheduling of site
                  visits, site visit reports, monitoring logs, follow-up
                  correspondence, hours worked, routine expense records, and any
                  other pertinent study-related documents

         o        Maintain routine contact with all CRAs to ensure the
                  consistency of program communication and work performed

         o        Provide ongoing quality control of the CRAB performance
                  throughout the Project

         o        Provide Global Program Director and International Project
                  Manager with periodic status reports including progress of
                  site initiations,

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -7-


         status of ongoing site visits, patient enrollment updates, site visit
         reports, data query rates, and other study-related reports

         3.       ASSOCIATED MANAGEMENT SUPPORT

IBAH will dedicate clerical/administrative support to the Project. The
clerical/administrative fee will cover costs associated with IBAH's services, as
well as management and administration associated with this Project. All travel
expenses, Federal Express and/or overnight courier services, and telephone
conference costs will be passed through at cost to Cubist.

B.       CLINICAL TRIAL INITIATION

         1.       PROJECT TEAM TRAINING

IBAH will rely on internal and external experts to provide specific therapeutic
area training and orientation to the protocol and the CRF prior to study
initiation and on an ongoing basis. This training will be designed to ensure
that all team members are familiar with the Project requirements and their role
within the team. Items discussed at these meetings will include, but will not be
limited to:

         o        Therapeutic area and clinical development background

         o        Protocol and CRF

         o        Discussion of therapeutic implications for this study

         o        Monitoring guidelines

         2.       IBAH S.T.A.R.T

In order to facilitate rapid study site initiations, IBAH has established IBAH
S.T.A.R.T (Study Trial Acceleration Resource Teams) in North America. The study
start-up functional areas that are included in this group are Investigator
Recruitment, Investigator Document Management, Investigator Agreement
Negotiation, and Investigator Meeting Coordination. A Coordinator will head each
S.T.A.R.T. team and will work with the Managers to devise and implement a
working strategy to promote an expeditious action plan. The goal is to provide
sites with a streamlined communication channel for all S.T.A.R.T activities. The
International Project Manager and the Country Trial Managers, for the
international portion of this Project, will perform these study start-up
activities.


*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -8-


         3.       INVESTIGATOR IDENTIFICATION, RECRUITMENT AND QUALIFICATION

IBAH will collaborate with Cubist to recruit [ ]* U.S. and [ ]* International
additional investigators capable of conducting the Cubist studies. A preliminary
telephone interview will be conducted to evaluate a prospective site's interest
and potential to meet both patient enrollment and data quality goals for this
Project. IBAH anticipates that [ ]* of the proposed sites in the U.S. will not
need actual qualification visits because sites qualified, within the past year
and experienced in anti-infective protocols, will be given the opportunity to
participate in this Project.

After obtaining a signed confidentiality agreement from the prospective
investigative sites, IBAH will issue a survey form, customized to the protocol.
Additional Project information will be distributed to appropriate investigators
who are willing to commit to study participation. The outcome of all
evaluations, with a final list of proposed investigators, will be forwarded to
Cubist for approval prior to final recruitment.

If it is necessary to assess the site's ability to achieve study enrollment and
data quality goals then a comprehensive pre-study evaluation visit will be
scheduled with the selected investigator. Once identified as a qualified study
site, an investigator regulatory document package will be sent.

         4.       INVESTIGATOR REGULATORY DOCUMENT MANAGEMENT

In coordination with Cubist, IBAH will develop a template of an informed consent
form for the Project, ensuring compliance with all local, state, and federal and
international regulatory requirements. Regulatory document packages, with
letters of instruction, will be mailed to qualified investigative sites. A
dedicated tracking process for regulatory document collection will be utilized.
Document collection will cover all criteria required under the principles of
Good Clinical Practices (GCP) and International Committee for Harmonization
(ICH) guidelines, as well as IBAH Standard Operating Procedures (SOPS). In
addition, IBAH S.T.A.R.T., will also collect certification / disclosure
information from all investigators and provide this information to Cubist on an
ongoing basis.

IBAH will track the retrieval of documents on an ongoing basis and provide
updates to Cubist as requested. IBAH will prepare copies of all appropriate
documents, assemble documents and issue an investigator regulatory binder to all
sites, including but not limited to:


*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -9-


         o        Investigator's Brochure

         o        Final Protocol and Sample Copy of the CRF

         o        Institutional Review Board (IRB) Approvals of Protocol and
                  Informed Consent Form(s)

         o        Laboratory Certification and Normal Ranges

         o        Completed FDA Form 1572

         o        Investigator Curriculum Vitae

         o        Financial Disclosure Certification and/or completed Financial
                  Disclosure Form

The binders will be maintained at the sites and reviewed for appropriate updates
by CRAB responsible for site management over the course of the study.
Certification of Investigator Financial Disclosure will be collected and
maintained as agreed upon by IBAH and Cubist. The fee for regulatory document
collection, processing, and tracking is based upon the number of sites required
for the study. File maintenance and updating will be billed at the rate of $[ ]*
per site per year after year one. Protocol amendments, which require informed
consent revisions and/or IRB re-submission, will be billed at an additional
processing fee of $[ ]* for each site.

         5.       INVESTIGATOR REGULATORY DOCUMENT COLLECTION (INTERNATIONAL)


STUDY MASTER FILES

In accordance with GCP, IBAH International Regulatory staff will:

         o        Develop Study Master File according to IBAH SOPS under
                  supervision of the Study Manager

         o        Obtain all relevant critical documents for the Project; design
                  an appropriate Critical Document Receipt List as a supporting
                  instrument for the CRAs; review all incoming investigators'
                  documents; approve/reject these documents according to GCP and
                  internal guidelines

         o        Maintain file, i.e. proper filing of all incoming papers
                  (investigator documents, site visit reports); file audits to
                  assure the completeness of the documents and to identify
                  missing documents

         o        Ship investigator documents to Cubist as required

         o        Arrange for archiving of the Study Master File at the end of
                  the Project

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -10-


PRE-STUDY APPROVALS

IBAH International Regulatory staff will prepare the necessary pre-study filings
with local regulatory authorities for permission to proceed with the clinical
trial, as well as follow-up with these local authorities to expedite the review
and approval process.

IBAH Regulatory staff will prepare the dossier (document compilation and
submission) and necessary study updates.

Fees are based on IBAH's staff time to prepare the dossier(s) and interact with
the regulatory agencies and IRBs. IBAH would also be responsible for translation
of documents into the different local languages. In addition, any direct charges
(dossier filing fees, travel to meetings at agencies, etc.) will be passed
through to Cubist at cost.

         6.       INVESTIGATOR AGREEMENT NEGOTIATION

IBAH will be responsible for the following activities related to negotiating the
clinical site contracts:

         o        Create an investigator agreement and patient budget

         o        Negotiate investigator agreements that satisfy Cubist
                  requirements

         o        Handle investigator agreements, approval by Cubist and
                  signature by, investigators

         o        Incorporate changes and securing re-approval by Cubist

         o        Communicate with IBAH Grants Administration Department when
                  necessary

         o        Handle investigator agreement amendments and/or addenda

         o        Collect excess grants from sites at study end

Protocol and study amendments, which require investigator agreement revisions,
amendments and/or re-negotiation, will be billed at an additional processing fee
of [ ]* for each site.

         7.       COORDINATOR'S AND INVESTIGATOR'S MEETING COORDINATION
                  AND ATTENDANCE

A Meetings Coordinator will be assigned to manage all logistics of the U.S. and
International meetings and will schedule necessary travel and hotel
arrangements. Specific responsibilities will include the following:

         o        Identify appropriate location(s) for the meetings

         o        Define meeting requirements and outline a meeting agenda

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -11-


         o        Negotiate, organize, and make all hotel arrangements

         o        Secure discounted travel arrangements and issue tickets to
                  investigators and study coordinators

         o        Prepare necessary meeting materials (e.g., annotated CRFs,
                  presentation materials, etc.)

         o        Coordinate presentations

         o        Manage administrative aspects associated with the meeting

IBAH's Project management and clinical trial management staff will be available
to conduct or participate in the meetings and will arrive at the location prior
to each meeting to assist attendees with any last minute details that may arise.

         8.       ELECTRONIC MAIL EXCHANGE

PRIVATE

Upon the mutual written agreement of the parties, IBAH will develop a connection
for the exchange of electronic mail between IBAH and Cubist. Upon the mutual
agreement of the parties, provisions can be made to allow IBAH staff to access
systems on Cubist's network and to allow printing from those systems to be
routed and printed on IBAH's printers.

PREREQUISITES

In order to provide these services, a communications link will need to be
established between Cubist and IBAH. Cubist will extend their WAN to IBAH rather
than IBAH extending its WAN to Cubist's location because it provides Cubist with
a greater degree of security and control. The WAN extension is terminated at the
IBAH site with a router that is owned and operated remotely by Cubist.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>
                                      -12-


SERVICES

Once the communications link has been established, connections will be extended
to a NT Server that would act as the electronic mail-relay that forwards mail
between the two companies. (See drawing below).

                     CLIENT CONNECTIONS TO THE IBAH NETWORK

              [GRAPHIC OF CLIENT CONNECTIONS TO THE IBAH NETWORK]

IBAH suggests using a VLAN to provide the interconnection between the two
networks because it provides the capability to isolate traffic. Because of the
switch's filtering capabilities. Cubist will only see the information on the
IBAH network that IBAH feels is appropriate, and IBAH will have access to
Cubist's information and systems that is provided over the WAN only from the
IBAH equipment directly attached to the VLAN switch.

Currently, IBAH is using Micro Exchange Server 5.5 as our electronic mail server
and Microsoft Outlook for our electronic mail. The electronic mail between
Cubist and IBAH will use the Simple Mail Transport Protocol (SMTP) to provide
the mail transport. The mail sent from IBAH would be routed over the IBAH
network to an NT server running Internet Information Server 4.0 (IIS) which
would provide the SMTP-relay function to forward the mail to Cubist. Likewise,
electronic mail from Cubist will arrive at IBAH via Cubist WAN and router. It
will be routed to the VLAN switch where it will be delivered to the NT Server
running IIS. IIS will then forward it to the IBAH Exchange Server for delivery.

Remote access to the Cubist systems is similar. IBAH staff will log onto
dedicated PCs attached to the VLAN switch and then open a session on the
Cubist's server to perform whatever function is required (data entry, document
submission, data analysis, etc.). Again, because of the filtering capabilities
of the switch, that traffic will only be accessible on the LAN segment
containing the dedicated PCs and printer and the LAN segment to which the Cubist
WAN is attached. Because there are no other devices on those segments, the
communications remain private. To print a document or export information from
the Cubist system to a device here at IBAH, the traffic is sent over the Cubist
WAN, through the VLAN switch, and onto the printer or server - again with the
privacy of the information maintained because of the switch's filtering
capabilities.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -13-


CUBIST RESPONSIBILITIES

         o        Provide IBAH with a list of addresses to be included in the
                  IBAH global address list

         o        Provide technical contact for initial configuration, testing
                  and problem resolution

         o        Order communications link between IBAH and Cubist locations

         o        Assume financial and operational responsibility for the
                  communications link

         o        Purchase, configure and operate router and CSU to be deployed
                  at IBAH location

IBAH RESPONSIBILITIES

         o        Establish global address list entry for Cubist organization

         o        Enter e-mail addresses for the individual staff members from
                  that Cubist organization in the global address list.

         o        Initial testing & configuration

         o        Routine monitoring

         o        Global address list maintenance - moves, adds & changes

         o        Mail delivery problem resolution

INTERNET-BASED

IBAH will use the Internet to communicate with Cubist. The costs are much lower
with this option. However, because information is transiting the Internet, there
will be severe restrictions on the content of the information that may be sent.
Deploying encryption software on each PC that will be communicating with IBAH
could solve some of the issues associated with this option.

C.       CLINICAL TRIAL MANAGEMENT

         1.       CLINICAL MONITORING

IBAH will assign a global team of experienced CRAB to perform pre-study
qualification, initiation, interim and closeout site visits. Deployment of CRAB,
in terms of number and frequency of visits, will be managed based on Cubist
input, geographic location and site-specific enrollment data.

IBAH's site management and monitoring procedures will be performed in accordance
with GCP to ensure each investigative site's compliance with regulations and
protocol requirements and to enhance expeditious enrollment of appropriate
patients into the clinical study. Regulatory documents will be reviewed by the
CRA on an ongoing basis during the study conduct phase, including verification
of signed informed consent forms and investigator IRB notifications.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -14-


Once all regulatory documents and approvals are received, a site initiation
visit will be scheduled. During this visit, the CRA will review the study goals,
protocol (with particular attention to inclusion/exclusion criteria, enrollment
plan/goal, adverse events, primary efficacy variables and GCP compliance), CRF
completion, and clinical supply dispensation/ accountability will be performed
with the investigator and his/her staff.

CRAs will perform 100% source document verification of CRF data for accuracy and
completeness, and will also review source data for appropriate identification,
documentation, and reporting of both serious and non-serious adverse events.
Drug accountability visits will be performed, as well as reconciliation and
removal of clinical supplies at study closeout per Cubist's requirements. In
general, the CRAB' efforts will be focused on source document verification and
expedient data retrieval.

         2.       CLINICAL GRANTS ADMINISTRATION

As a follow-up to the Investigator Agreement negotiation process, an extension
of the IBAH contracts group will administer the clinical grant payments to the
site. Included in their responsibilities are the following:

         o        Process financial records for all of the patients in the study

         o        Issue initial and interim payments for each investigator

         o        Reconcile all payments to each of the investigators prior to
                  the final payments

         o        Track account administration with IBAH's finance group

         o        Maintain W9 forms and all relevant and related government
                  reports (U.S. only)

Investigator grants, within parameters defined by Cubist, will be passed through
at cost to Cubist. A grant administration fee will be applied, based on the
number of sites and payments to be managed throughout the duration of the study.

         3.       CRF TRACKING, FILING AND ARCHIVING

Completed CRFs received from investigative sites, ancillary CRF pages, adverse
event documentation, and patient-specific correspondence for each study will be
logged in and tracked at IBAH. Of these items, CRFs and answered data queries
will be entered page-by-page into a computerized tracking system. Fees reflect
logging, copying, filing, and ongoing CRF tracking time. A final, complete page
listing and original CRFs will be provided to Cubist upon Project completion.
Cubist will be billed for the actual number of pages logged/tracked.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -15-


         4.       MEDICAL MONITORING (DURING BUSINESS HOURS)

An IBAH U.S. and International Medical Monitor will oversee the medical aspects
of Cubist's clinical program. In addition to acting as medical advisors to the
Project Team, the Medical Monitors will be responsible for the following:

         o        Project planning

         o        Review of clinical documentation (protocol, CRF, sample
                  informed consent form)

         o        Project-specific medical training

         o        Evaluate patient eligibility (in conjunction with the Medical
                  Director of Cubist)

         o        Participate in team meetings

         o        Review study reports, regulatory submissions and study
                  manuscripts

         5.       SAFETY REVIEW OF CRFS

Prior to data entry, a U.S. and International Safety Officer will review all
pages of each case, ancillary laboratory pages and all data clarification
requests. Cubist will be notified immediately of serious adverse events (SAEs)
that have not been previously reported by the sites. Notification will occur by
telephone, as well as by forwarding to Cubist an SAE form. The SAE form will
include details of the SAE obtained from the investigative site and will be sent
via facsimile to the designated recipient at Cubist. As follow-up information is
obtained by IBAH, the SAE form will be updated and forwarded to Cubist.

         6.       SAE REPORTING

Within one IBAH business day of receipt, IBAH will forward to Cubist all SAE
information received from site personnel or IBAH CRAs. Notification to Cubist
will occur via telephone, as well as by forwarding a comprehensive SAE form via
facsimile. Cubist will be responsible for reporting SAES to the FDA. IBAH's
International staff will report SAEs to non-U.S. agencies. The fee for SAE
reporting includes costs for IBAH to provide all follow-up information and to
update SAE forms as necessary. Cubist will be billed for the actual number of
SAE reports.

         7.       SAFETY PHONE COVER (INTERNATIONAL)

During business hours, IBAH has a direct number to IBAH's Safety Surveillance
Department for receipt of SAE information. During evening

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -16-


hours, weekends and holidays, a designated member of the Safety Surveillance
Department will be on call via beeper. All return calls to the sites will be
made immediately to obtain the necessary SAE information and to determine the
necessity of an SAE report.

D.       CLINICAL DATA MANAGEMENT

         1.       DATA MANAGEMENT PLAN

IBAH's Clinical Data Manager will develop a Global Data Management Plan. This
plan will include the entry and review guidelines, automated edits checks of the
data, dictionary coding procedures, and central laboratory loading procedures.
Any other data management tasks requested for this Project will also be outlined
in this plan.

         2.       PROJECT DATABASE CREATION

Data screens will be developed by IBAH's programming group on an Open VMS System
(Alpha 4100) using Domain/CLINTRIAL(R) software. IBAH's Programmers will develop
data-entry screens (i.e., CRF data module designs) that mimic the flow of the
CRF, thereby improving the ease and integrity of the data-entry process.

         3.       DATA ENTRY, CASE REPORT FORM REVIEW AND QUERY RESOLUTION

IBAH's data-entry specialists will enter all CRF data utilizing a double-entry
method. On-line edit checks will be included to provide additional controls
against categorically incorrect data. The dual data-entry strategy will utilize
numeric and/or text fields that are entered by one member of the data-entry
staff and re-entered on-line by a second member of the staff. Cubist will be
billed for the actual number of pages entered.

IBAH will generate protocol-specific guidelines that are reviewed and approved
by Cubist. Using these guidelines, IBAH will conduct a detailed quality control
(QC) review of the entire CRF through a combination of manual review and
electronic edit checks that will identify conflicting, unclear or incomplete
data. IBAH's Clinical Data Analysts (CDAs) will perform this review. IBAH's CQA
will oversee these activities and may, in its discretion, perform audits to
ensure quality as part of this data service deliverable. If data are unclear,
conflicting or incomplete, then queries will be generated and transmitted to the
investigative site and IBAH's Client Services Department. All queries (issued
and resolved) will be logged into the IBAH tracking system. IBAH's query
database will be maintained

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -17-


throughout the Project and can provide Cubist with an up-to-date report on the
status of queries on an as-needed basis. Cubist will be billed for the actual
number of pages reviewed.

In addition, each case will be printed as a data listing with 100% verification
of critical data fields and text fields against the hard-copy CRF. Also, [ ]*%
of the patients will be verified for 100% of the data fields prior to the
closing of the database. Standard and protocol-specific edit checks will be
created and results of the edit checks will be reviewed by the CDA during the
review process and prior to database closure for the generation of queries. All
verification will be documented.

         4.       DICTIONARY PROCESSING

IBAH will use MedDRA for coding adverse events and WHO-DRUG for coding
medications. A Cubist-modified dictionary can be accommodated at an additional
fee to cover loading and validation of Cubist's dictionaries, as well as
development of a mapping code. MedDRA for presenting conditions and diagnoses
can be provided at an additional fee.

IBAH will use standard coding conventions for the mapping procedure unless
otherwise instructed at the Project start. An additional cost will be incurred
for changes to coding conventions after Project start. An automated process will
be used to map literal text to the corresponding term in the dictionary.
Unmapped terms will be researched, coded, and reviewed by a dedicated team.
Dictionary reports will be inclusive of automated and manually coded terms and
will be reviewed by IBAH's Medical Monitors prior to database closure.

         5.       LABORATORY DATA PROCESSING (CENTRAL)

TRANSFER AND VERIFICATION OF CENTRAL LABORATORY DATA

IBAH will develop the programs needed for conversion and integration of central
laboratory data. Central lab data sets will be loaded into the clinical
database. Accession numbers from the laboratory hard copy received with the case
will be entered into the database. Verification will compare the header data
received electronically against the case data including the patient number, lab
date, date of birth, gender, patient initials, and lab accession numbers.
Discrepancies will be communicated to the central lab and/or Cubist. Full lab
panel validation will be performed on [ ]*% of the patients to verify accuracy
of the load. IBAH assumes that all laboratory results will be forwarded with the
appropriate normal range and flag attached at the record level.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -18-


         6.       DATA TRANSFER

At the conclusion of the study, IBAH will transfer the Project database to
Cubist in standard IBAH SAS data sets using IBAH standard naming conventions and
format. Customized data transfers, or interim database closes and transfers, can
be accommodated on request at an additional fee.

         7.       SECURITY PROCEDURES

All files, including data and programming, will be backed-up daily and a
complete tape will be sent to secure storage off-site on a weekly basis for
disaster recovery. All personnel maintain their own log-on IDs and all passwords
will be changed monthly. Only authorized personnel will have access to
databases, which have additional unique access codes. Data access codes will be
changed upon database review and closure to allow only authorized personnel
access to the database.

As part of routine documentation, a controlled procedure will be used to archive
two sets of tapes containing all pertinent system files employed in the Project,
(i.e., Domain/CLINTRIAL(R) software, data sets, screen modules, SAS programming,
and listing files).

         8.       MACHINE PROCESSING AND STORAGE

IBAH's Database Administrator will maintain the integrity of Cubist's clinical
database for the duration of the Project estimated at [ ]*.

E.       BIOMETRICS ANALYSIS AND TABLE GENERATION

         1.       STATISTICAL ANALYSIS PLAN/DESIGN OF TABLE SHELLS

A statistical analysis plan, including operational definition of endpoints to be
analyzed, definition of patient subsets (evaluable and intent-to-treat), visit
windows, rules for data handling, and a detailed description of statistical
methodology, will be prepared for each study. The statistical plan will include
a set of formatted shells for all data displays (data listings, summary tables
and graphics) planned for the study, which will be prepared with input from the
Clinical Writing Department. If formatted data displays are not required, a
detailed table of contents of SAS generated data displays will be included. This
plan will be submitted to Cubist for review and approval prior to closing the
database for analysis.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -19-


         2.       PROJECT DATA SETUP AND PROGRAMMING OF DATA DISPLAYS

Prior to programming actual data displays (data listings, summary tables and
graphics), IBAH will develop data display headers and create the status data set
and efficacy data set, if needed, which will be used for the data analysis.
After approval of the prototype data display formats by Cubist and the IBAH
Project Team, IBAH's programming staff will develop the programs required to
generate each data display. Programming will be performed using SAS system
software, and will incorporate procedure output and customized report writing
features. Any changes to data display formats after approval and programming
initiation could result in additional charges.

         3.       QUALITY CONTROL PROCEDURES FOR DATA DISPLAYS

IBAH's Biometrics staff will use a combination of independent programming, hand
tabulations from supporting listings, and programming verification to ensure the
accuracy and completeness of tables, listings, and statistical results. All
report data displays will be verified for accuracy and internal consistency
among data displays. A quality control binder, including the quality control
strategy for each data display and audit trail, will be included in the Project
file.

         4.       PATIENT EVALUABILITY AND OUTCOME ASSESSMENT

Patient evaluability, outcome assessment criteria and relevant algorithms will
be developed for the Project by IBAH and presented to Cubist for review and
approval. These algorithms will be programmed using SAS to identify evaluable
patients and outcome assessments. Biostatisticians will verify the accuracy of
the output with independent programming and review of individual patient data.
Final decisions regarding patient evaluability and outcome assessment will
require approval by Cubist; these are performed once for each patient.

Data listings for each patient's evaluability status and outcome assessment will
be prepared and submitted to Cubist for classification prior to breaking the
blind. Data classification meetings may be held either in person or via
teleconference.

         5.       STATISTICAL ANALYSIS

Statistical analysis, in accordance with the approved statistical analysis plan,
will be performed by IBAH staff biostatisticians. The analysis includes
verification of assumptions needed for statistical inference, determination of
investigator-by-treatment interaction, and examination of outlying data points.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -20-


Statistical findings which may not be appropriate for the body of a clinical
report (e.g., tests for interaction, data distribution issues, etc.), deviations
from the planned analyses, and additional exploratory analyses will be included
in a statistical appendix to the clinical report. Fees include one major
revision and one minor revision.

The Project statistician will also review the clinical reports to ensure
appropriate representation of statistical methodology and inference.

         6.       DATA LISTING AUDIT

A percentage of quality-controlled data listings may, at IBAH's discretion, be
chosen for an audit. From this, a percentage of patients will be chosen within
each selected listing for audit. The data listing information will be verified
against the selected patient(s) cases. The audit will take place once the
listings are determined to be final by IBAH's Biometrics Department. IBAH's CQA
will oversee these activities to ensure quality as part of this service
deliverable.

         7.       SUMMARY TABLES AUDIT

Following the generation of tables and listings by Biometrics, IBAH may, at its
discretion, review a proportion of the summary tables, focusing on critical data
elements, against the supporting data listings to independently verify the
accuracy of the data and consistency of format. IBAH's CQA will oversee these
activities to ensure quality as part of this service deliverable.

F.       CLINICAL WRITING

         1.       PHASE II / III CLINICAL STUDY REPORTS

Integrated clinical and statistical summaries will be prepared in accordance
with ICH guidelines. Draft clinical reports will be generated within [ ]* after
receipt of final summary tables and patient listings.

IBAH will prepare a phase II/III clinical report for each of the following
studies:

         o        Complicated SSTI U.S. study

         o        Complicated SSTI International study

         o        RRC Companion U.S. study

         o        RRC Companion International study

         o        Bacteremia study

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -21-


The fee for the phase III reports includes up to [ ]* brief patient narratives
and [ ]*. One major revision of the draft reports is considered not to take more
than [ ]* after receipt of all requests for changes, and a minor revision will
consist of changes that can be completed in up to [ ]*. This fee does not
include collation and assembly of appendices.

IBAH assumes that the methods for the U.S. studies will be completed and
reviewed prior to drafting the methods for the International studies. IBAH also
assumes that the protocols for the U.S. and International studies are similar
and that all reports will be completed according to the same format and
presentation.

All phase II/ III clinical reports will receive two independent levels of
quality control review before they are released. There will be a QC review by
IBAH's Clinical Writer for accuracy and consistency, and a review by the writing
manager for accuracy, client format consistency, and appropriate regulatory and
clinical perspective.

Writing fee estimates are based on receipt of final data. If any changes should
occur after work on the reports has begun, IBAH assumes that these changes will
not impact the production of the report. If database changes occur which require
a substantial amount of time [ ]* for rework or repeat quality control,
additional fees will be agreed upon with Cubist before proceeding with the
reports.

         2.       CLINICAL AUDIT

IBAH may, at its discretion, perform an audit of the clinical study report. The
clinical study report audit will examine the consistency between text and
figures quoted in the version of the report agreed upon with Cubist, with those
appearing in the statistical tables and listings which accompany the report.
This audit will include a review of all sections for format consistency and
table of contents cross-reference. In addition, text and figures will be
verified against the verified tables/listings and any typographical and
grammatical errors that are noted. This audit is performed on the final version,
following incorporation of Cubist's comments. IBAH's CAQ will oversee these
activities to ensure quality as part of this service deliverable.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -22-


V.       FINANCIAL CONSIDERATIONS

A.       GLOBAL PROJECT BUDGET SUMMARY

[   ]*

DETAILED BUDGETS

1.       U.S. Clinical Monitoring Budget for Complicated SSTI and Companion RRC
         Study

[   ]*

2.       International Clinical Monitoring Budget for Complicated SSTI and
         Companion RRC Study

[   ]*

3.       Global Clinical Budget for Complicated SSTI

[   ]*

4.       Global Clinical Budget for Companion RRC Study

[   ]*

5.       Clinical Budget for Gram Positive Bacteremia Study

[   ]*

C.       PAYMENT SCHEDULES

         1.       INVOICING PROCESS FOR SERVICE FEES

IBAH maintains a project accounting system, whereby all direct project costs
(service or passthrough expenses) are coded by project.

An initial payment of [ ]*, representing approximately [ ]* of Project costs, is
due and payable upon execution of this Exhibit A. Subsequent payments shall be
made monthly, based on Services performed and upon submission of an invoice to
Cubist by IBAH. The subsequent invoices shall be reduced by a prorated portion
from the initial payment such that the initial payment is applied evenly over
the term of the Project. All payments shall be processed within [ ]*. If any
payment of service fees or pass through expenses is late by more than [ ]*, such
payment shall be subject to a penalty fee of [ ]* per month of the outstanding
balance.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -23-


         2.       PASS THROUGH EXPENSE INVOICING

Grant Payments - IBAH will invoice [ ]* in advance of grant payments due
investigators based on estimates.

IBAH requires payment from Cubist at least [ ]* in advance of the actual payment
to investigators. Payments to investigators will not be released until payments
are received by IBAH from Cubist. Upon Cubist's request, IBAH agrees to deposit
payments from Cubist into a non-interest bearing bank account. IBAH shall draw
upon such account to make the investigator payments. Any remaining funds in the
account will be returned to Cubist after the termination of the study, as soon
as all contracted obligations to the investigators have been satisfied.

In the event payments from Cubist are insufficient to cover the payments to
investigators, Cubist will promptly advance funds to IBAH for the amount of
grant payments required.

IBAH's project accounting system is able to capture and categorize in summary
the following key pass-through expenses related to a project:

         o        Travel

         o        Delivery fees

         o        CRF and other printing costs

         o        All other project related expenses that are not related to
                  service fees and any additional detail to support pass-through
                  costs will be provided on a fee basis.

         3.       ANNUAL PRICE INCREASE

Notwithstanding anything contained herein to the contrary, the estimated Service
Fees set forth in this Exhibit A shall remain in effect through [ ]*.
Thereafter, IBAH reserves the right to increase the price of the remaining
Services under this Exhibit A; such increases shall not exceed [ ]*.

VI.      SIGNATORY AUTHORITY

The parties acknowledge and agree that Cubist has authorized IBAH to execute all
Clinical Study Agreements with investigators in the Project on behalf of Cubist.
Cubist understands and acknowledges that it will be bound by the terms of the
investigator agreements.

ACCEPTANCE

The terms and conditions of the Master Agreement govern this Exhibit A and such
document is incorporated herein by reference as if fully set forth herein.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -24-


BY AND BETWEEN:

CUBIST PHARMACEUTICALS, INC.                    IBAH, INC.


BY: /s/ FRANCIS P. TALLY                        By: /s/ LEONARD F. STIGLIANO
   ----------------------------------              ----------------------------


Name:  Francis P. Tally                         Name:  Leonard F. Stigliano


Title:  Ex. VP Scientific Affairs               Title:  President, U.S. CRO


Dated: 12/21/99                                 Dated:  12/20/99


*Confidential treatment requested: Material has been omitted and filed with
the Commission.

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.51
<SEQUENCE>4
<FILENAME>a2042768zex-10_51.txt
<DESCRIPTION>EXHIBIT 10.51
<TEXT>

<PAGE>
                                                                EXHIBIT 10.51


                             CONFIDENTIAL TREATMENT


               EXHIBIT B TO THE CLINICAL SERVICES MASTER AGREEMENT
          BETWEEN CUBIST PHARMACEUTICALS, INC. AND IBAH, INC., DATED
                               DECEMBER 1, 1999.


         THIS EXHIBIT B is entered into this 12th day of April,  2000, by and
between  Cubist  Pharmaceuticals, Inc. (hereinafter "Cubist") an IBAH, Inc.
(hereinafter "IBAH").

         WHEREAS, Cubist and IBAH entered into a Clinical Services Master
Agreement, dated December 1, 1999 (hereinafter the "Master Agreement"),
wherein IBAH agreed to provide clinical services and;

         WHEREAS, Cubist and IBAH agree that IBAH shall provide the services
set forth in this Exhibit B, subject to the terms and conditions set forth in
the Master Agreement;

         NOW, THEREFORE, for good and valuable consideration, and INTENDING
TO BE LEGALLY BOUND, Cubist and IBAH agree as follows:

I.       PROJECT PLAN

Based on the Project Specifications, IBAH has provided a description of
services to be performed for Cubist's complicated urinary tract infection
(CUTI) Daptomycin Program, Protocol Number DAP00-03 (hereinafter "the
Project") and associated costs. Changes made in the Project scope, at any
time during the Project, will result in a corresponding adjustment to the
Project costs.

A.       PROJECT STATUS TABLE

[     ]*



*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

<PAGE>

                                       -2-


II.      PROJECT ROLES AND RESPONSIBILITIES

<TABLE>

<S>       <C>                                                                   <C>           <C>
- -----------------------------------------------------------------------------------------------------------
                                          TASK                                     CUBIST         IBAH
- -----------------------------------------------------------------------------------------------------------
A.        STUDY MANAGEMENT
- -----------------------------------------------------------------------------------------------------------
1.        Facilitate Project Management                                                             X
          o   Program Director [     ]*
          o   International Project Manager [   ]*
          o   CTM [      ]*
- -----------------------------------------------------------------------------------------------------------
2.        Coordinate and conduct team meetings                                        X             X
- -----------------------------------------------------------------------------------------------------------
3.        Standard Operating Procedures (SOPs)                                                      X
- -----------------------------------------------------------------------------------------------------------
4.        Performance tracking                                                                      X
- -----------------------------------------------------------------------------------------------------------
5.        Monitor Project payment schedule                                            X             X
- -----------------------------------------------------------------------------------------------------------
6.        Project problem solving                                                     X             X
- -----------------------------------------------------------------------------------------------------------
7.        Clerical and administrative support                                                       X
          (US - [        ]*)
          International - [       ]*
- -----------------------------------------------------------------------------------------------------------
B.        CLINICAL TRIAL INITIATION
- -----------------------------------------------------------------------------------------------------------
1.        Drug development and study design                                           X
- -----------------------------------------------------------------------------------------------------------
2.        Protocol Development                                                                      X
- -----------------------------------------------------------------------------------------------------------
3.        Patient plan                                                                X
          o   CUTI-[ ]* patients enrolled in U.S./[  ]* patients enrolled
              in International [   ]* patients total
- -----------------------------------------------------------------------------------------------------------
4.        Site plan                                                                                 X
          o   Up to [  ]* Sites U.S.
          o   [  ]*  sites   Internationally  -  Australia,   Belgium,   Czech
              Republic, German Greece Hungary, Poland Russia
- -----------------------------------------------------------------------------------------------------------
5.        CRF design                                                                                X
          o   CUTI -[  ]* estimated pages
- -----------------------------------------------------------------------------------------------------------
6.        CRF logistics (print, bind, and distribute)                                               X
          o   Material,  printing and assembly expenses will be passed through
              at cost
- -----------------------------------------------------------------------------------------------------------
7.        Investigator identification, recruitment and qualification                                X
- -----------------------------------------------------------------------------------------------------------
8.        Investigator regulatory document management                                               X
          o Protocol Amendments and IRB submissions billed per site
          o Informed Consent Forms development
- -----------------------------------------------------------------------------------------------------------
9.        Certification of Investigator Financial Disclosure                                        X
- -----------------------------------------------------------------------------------------------------------
10.       Investigator agreement negotiation                                                        X
- -----------------------------------------------------------------------------------------------------------
11.       Coordination of investigators meeting                                                     X
          o   One meeting US; Two meetings International
- -----------------------------------------------------------------------------------------------------------
12.       Project team training                                                       X             X
- -----------------------------------------------------------------------------------------------------------

*Confidential treatment requested: Material has been omitted and filed with the
 Commission.




<PAGE>


                                       -3-

- -----------------------------------------------------------------------------------------------------------
                                          TASK                                     CUBIST         IBAH
- -----------------------------------------------------------------------------------------------------------
C.        CLINICAL TRIAL MANAGEMENT
- -----------------------------------------------------------------------------------------------------------
1.        Clinical monitoring                                                                       X
          o   IBAH estimates [  ]*  U.S. qualification visits and  [  ]*
              International one-day qualification visits ([   ]* visits total)
          o   IBAH estimates performance of [   ]* U.S. and [  ]*
              International initiation visits [   ]* visits total
          o   BAH estimates performance of [   ]* U.S. and [  ]*
              International interim visits ([   ]* visits total)
          o   IBAH estimates [ ]* U.S. and [ ]* International close-out
              visits [   ]* visits total
- -----------------------------------------------------------------------------------------------------------
2.        Clinical grant payment administration (Assumes 4 payments per site)                       X
- -----------------------------------------------------------------------------------------------------------
3.        CRF tracking, filing and archiving                                                        X
          o   [  ]*  -US  [  ]*  -   International CRF pages  [  ]*  pages
              total)
- -----------------------------------------------------------------------------------------------------------
4.        Medical monitoring                                                                        X
          o   [      ]* in US
          o   [      ]* in International
- -----------------------------------------------------------------------------------------------------------
5.        Safety review of CRFs                                                                     X
          o   Based on [   ]* cases reviewed
- -----------------------------------------------------------------------------------------------------------
6.        SAE Reporting with Patient Summaries                                                      X
          o   CUTI U.S. [   ]*/International [   ]* [   ]* total)
- -----------------------------------------------------------------------------------------------------------
D.        CLINICAL DATA MANAGEMENT
- -----------------------------------------------------------------------------------------------------------
1.        Project database creation and data entry                                                  X
          Fee based on:
          o   CUT1-   [8,250] CRF from US & [  ]* CRF pages from
              International ([    ]* total)
- -----------------------------------------------------------------------------------------------------------
2.        Case report form review and query resolution                                              X
          Fee based on:
          o   CUTI-   [   ]* CRF from US & [  ]* CRF pages from
              International ([     ]* total)
- -----------------------------------------------------------------------------------------------------------
3.        Dictionary processing of CRFs                                                             X
          o   [   ]* CRFs
- -----------------------------------------------------------------------------------------------------------
4.        Laboratory data processing (central)                                        X             X
          o   Covance
- -----------------------------------------------------------------------------------------------------------
5.        Reconciliation of Safety/Clinical Databases                                               X
- -----------------------------------------------------------------------------------------------------------
6.        Data transfer (standard)                                                                  X
- -----------------------------------------------------------------------------------------------------------
7.        Data security procedures                                                                  X
- -----------------------------------------------------------------------------------------------------------
E.        BIOMETRIC ANALYSIS
- -----------------------------------------------------------------------------------------------------------
1.        o   Statistical analysis                                                                  X
          o   plan-includes one major one minor revision
- -----------------------------------------------------------------------------------------------------------
2.        Randomization                                                                             X
- -----------------------------------------------------------------------------------------------------------
3.        Project data setup and programming of displays                                            X
          o   CUTI  [ ]* primary tables and listings and [ ]* secondary
              tables and listing
- -----------------------------------------------------------------------------------------------------------
4.        Quality control procedures for displays                                                   X
- -----------------------------------------------------------------------------------------------------------
5.        Patient evaluability and outcome assessment                                               X
- -----------------------------------------------------------------------------------------------------------
6.        Interim transfer of listings                                                              X
- -----------------------------------------------------------------------------------------------------------


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.



<PAGE>

                                       -4-


- -----------------------------------------------------------------------------------------------------------
                                          TASK                                     CUBIST         IBAH
- -----------------------------------------------------------------------------------------------------------
7.        Final statistical analysis                                                                X
- -----------------------------------------------------------------------------------------------------------
8.        Statistical support for table preparation                                                 X
- -----------------------------------------------------------------------------------------------------------
9.        Data loading and review                                                                   X
- -----------------------------------------------------------------------------------------------------------
10.       Statistical report
- -----------------------------------------------------------------------------------------------------------
F.        CLINICAL WRITING
- -----------------------------------------------------------------------------------------------------------
1.        Phase III clinical study report-CUTI
          o   [      ]* revision and up to [   ]* brief patient narratives
          o   Fee does not include collation or compilation of appendices
- -----------------------------------------------------------------------------------------------------------
</TABLE>

III.     PROJECT TIMELINE

The parties acknowledge that IBAH commenced performance of the Service on or
about December 20, 1999. The projected timeline for this Project is as follows:

                           [       ]*

(Rest of page intentionally left blank)


















*Confidential treatment requested: Material has been omitted and filed with the
 Commission.


<PAGE>

                                       -5-

IV.      IBAH SERVICES

A.       STUDY MANAGEMENT

         1.       PROGRAM DIRECTOR/INTERNATIONAL PROJECT MANAGER

IBAH's Program Director will coordinate the services being provided by all of
the disciplines within IBAH and will act as a single point of contact for Cubist
until completion of the Project. The International Project Manager, working in
conjunction with the Program Director, will manage the international segment of
the Project.

Key responsibilities of these individuals will include the following:

   o Prepare detailed Project timelines and ensuring that the major milestones
     are met
   o Provide Project status updates
   o Identify and resolve critical Project issues
   o Ensure adequate resource allocation across all functions
   o Oversee Project team meetings
   o Manage Project financial issues

         2.       COUNTRY TRIAL MANAGERS/CLINICAL TRIAL MANAGERS

IBAH's Country Trial Managers will be dedicated to managing the day-to-day
clinical trial activity. They will oversee all site and CRA activities within
this Project.

Primary responsibilities of these individuals will include the following:

   o Develop case report forms and monitoring guidelines
   o Oversee regulatory document management from each of the investigational
     sites
   o Review and track CRA activities including scheduling of site visits,
     site visit reports, monitoring logs, follow-up correspondence, hours
     worked, routine expense records, and any other pertinent study-related
     documents
   o Maintain routine contact with all CRAB to ensure the consistency of
     program communication and work performed
   o Provide ongoing quality control of the CRAs performance throughout the
     Project Provide Program Director and International Project Manager with
     periodic status reports including progress of site initiations, status
     of ongoing site visits, patient enrollment updates, site visit reports,
     data query rates, and other study-related reports


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.


<PAGE>

                                       -6-


         3.       ASSOCIATED MANAGEMENT SUPPORT

IBAH will dedicate clerical/administrative support to the Project. The
clerical/administrative fee will cover costs associated with IBAH's services, as
well as management and administration associated with this Project. All travel
expenses, Federal Express and/or overnight courier services, and telephone costs
will be passed through at cost to Cubist.

B.       CLINICAL TRIAL INITIATION

         1.       PROJECT TEAM TRAINING

IBAH will rely on internal and external experts to provide specific therapeutic
area training and orientation to the protocol and the CRF prior to study
initiation and on an ongoing basis. This training will be designed to ensure
that all team members are familiar with the Project requirements and their role
within the team. Items discussed at these meetings will include, but will not be
limited to:

   o Therapeutic area and clinical development background
   o Protocol and CRF
   o Discussion of therapeutic implications for this study Monitoring guidelines

         2.       CRF DESIGN AND PRINTING

IBAH will work in conjunction with Cubist to design a case report form (CRF) for
recording pertinent Study data. Data Management, Biometrics, and the CTM will
review the CRF and provide input to ensure all relevant data is captured. A
review meeting with Cubist will be held to resolve any design questions or other
concerns which may arise. IBAH will provide Cubist with bids from independent
printing vendors. CRFs will be sent for printing on 3-part NCR after all issues
are resolved and final approval from IBAH and Cubist is received. Estimated fees
for CRF materials and printing are based on a per case basis. CRFs will be
collated into binders with spines and covers, and a protective NCR foldover will
be provided with each CRF binder. Actual materials, printing, assembly, and
distribution fees will be passed through to Cubist.




*Confidential treatment requested: Material has been omitted and filed with the
 Commission.


<PAGE>

                                       -7-

         3.       IBAH S.T.A.R.T

In order to facilitate rapid study site initiations, IBAH has established IBAH
S.T.A.R.T (Study Trial Acceleration Resource Teams) in North America. The study
start-up functional areas that are included in this group are Investigator
Recruitment, Investigator Document Management, Investigator Agreement
Negotiation, and Investigator Meeting Coordination. A Coordinator will head each
S.T.A.R.T. team and will work with the Managers to devise and implement a
working strategy to promote an expeditious action plan. The goal is to provide
sites with a streamlined communication channel for all S.T.A.R.T activities. The
International Project Manager and the Country Trial Managers will perform these
study start-up activities for the international portion of this Project.

         4.       INVESTIGATOR IDENTIFICATION, RECRUITMENT AND QUALIFICATION

IBAH will collaborate with Cubist to recruit [ ]* U.S. and [ ]* International
investigators capable of conducting the Cubist CUTI study. A preliminary
telephone interview will be conducted to evaluate a prospective site's interest
and potential to meet both patient enrollment and data quality goals for this
Project.

After obtaining a signed confidentiality agreement from the prospective
investigative sites, IBAH will issue a survey form, customized to the protocol.
Additional Project information will be distributed to appropriate investigators
who are willing to commit to study participation. The outcome of all
evaluations, with a final list of proposed investigators, will be forwarded to
Cubist for approval prior to final recruitment.

If it is necessary to assess the site's ability to achieve study enrollment and
data quality goals then a comprehensive pre-study evaluation visit will be
scheduled with the selected investigator. Once identified as a qualified study
site, an investigator regulatory document package will be sent.

         5.       INVESTIGATOR REGULATORY DOCUMENT MANAGEMENT

In coordination with Cubist, IBAH will develop a template of an informed consent
form for the Project, ensuring compliance with all local, state, and federal and
international regulatory requirements. Regulatory document packages, with
letters of instruction, will be mailed to qualified investigative sites. A
dedicated tracking process for regulatory document collection will be utilized.
Document collection will cover all criteria required under the principles of
Good Clinical Practices (GCP) and International Committee for Harmonization
(ICH) guidelines, as well as IBAH Standard Operating Procedures (SOPs). In
addition, IBAH S.T.A.R.T., will also collect certification / disclosure
information from all investigators and provide this information to Cubist on an
ongoing basis.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.


<PAGE>

                                       -8-

IBAH will track the retrieval of documents on an ongoing basis and provide
updates to Cubist as requested. IBAH will prepare copies of all appropriate
documents, assemble documents and issue an investigator regulatory binder to all
sites, including but not limited to:

   o Investigator's Brochure
   o Final Protocol and Sample Copy of the CRF
   o Institutional Review Board (IRB) Approvals of Protocol and Informed
     Consent Form(s)
   o Laboratory Certification and Normal Ranges
   o Completed FDA Form 1572
   o Investigator Curriculum Vitae
   o Financial Disclosure Certification and/or completed Financial Disclosure
     Form

The binders will be maintained at the sites and reviewed for appropriate updates
by CRAs responsible for site management over the course of the study.
Certification of Investigator Financial Disclosure will be collected and
maintained as agreed upon by IBAH and Cubist. The fee for regulatory document
collection, processing, and tracking is based upon the number of sites required
for the study. File maintenance and updating will be billed at the rate of [ ]*
per site per year after year one. Protocol amendments, which require informed
consent revisions and/or IRB re-submission, will be billed at an additional
processing fee of [ ]* for each site.

         6.       INVESTIGATOR REGULATORY DOCUMENT COLLECTION (INTERNATIONAL)

STUDY MASTER FILES

In accordance with GCP, IBAH's International staff will:

   o Develop Study Master File according to IBAH SOPS under supervision of the
     Study Manager
   o Obtain all relevant critical documents for the Project; design
     an appropriate Critical Document Receipt List as a supporting instrument
     for the CRAB; review all incoming investigators' documents;
     approve/reject these documents according to GCP and internal guidelines
   o Maintain file, i.e. proper filing of all incoming papers (investigator
     documents, site visit reports); file audits to assure the completeness
     of the documents and to identify missing documents
   o Ship investigator documents to Cubist as required
   o Arrange for archiving of the Study Master File at the end of the Project


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

<PAGE>

                                       -9-

PRE-STUDY APPROVALS

IBAH's Regulatory staff will prepare the necessary pre-study filings with local
regulatory authorities for permission to proceed with the clinical trial, as
well as follow-up with these local authorities to expedite the review and
approval process.

IBAH's Regulatory staff will prepare the dossier (document compilation and
submission) and necessary study updates.

Fees are based on IBAH's staff time to prepare the dossier(s) and interact with
the regulatory agencies and IRBs. IBAH will also be responsible for translation
of documents into the different local languages. In addition, any direct charges
(dossier filing fees, travel to meetings at agencies, etc.) will be passed
through to Cubist at cost.

         7.       INVESTIGATOR AGREEMENT NEGOTIATION

IBAH will be responsible for the following activities related to negotiating
the clinical site contracts:

   o Create an investigator agreement and patient budget
   o Negotiate investigator agreements that satisfy Cubist requirements
   o Handle investigator agreements, approval by Cubist and signature by
     investigators o Incorporate changes and securing re-approval by Cubist
   o Communicate with IBAH Grants Administration Department when necessary
   o Handle investigator agreement amendments and/or addenda
   o Collect excess grants from sites at study end

Protocol and study amendments, which require investigator agreement revisions,
amendments and/or re-negotiation, will be billed at an additional processing fee
of [ ]* for each site.

*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

<PAGE>


                                       -10-


         8.       COORDINATOR'S AND INVESTIGATOR'S MEETING COORDINATION AND
                  ATTENDANCE

A Meeting Coordinator will be assigned by IBAH to manage all logistics of the
U.S. and International meetings and will schedule necessary travel and hotel
arrangements. Specific responsibilities will include the following:

   o Identify appropriate location(s) for the meetings
   o Define meeting requirements and outline a meeting agenda
   o Negotiate, organize, and make all hotel arrangements
   o Secure discounted travel arrangements and issue tickets to investigators
     and study coordinators
   o Prepare necessary meeting materials (e.g., annotated CRFs, presentation
     materials, etc.)
   o Coordinate presentations
   o Manage administrative aspects associated with the meeting

IBAH's Project Management and Clinical Trial Management staff will be available
to conduct or participate in the meetings and will arrive at the location prior
to each meeting to assist attendees with any last minute details that may arise.

C.       CLINICAL TRIAL MANAGEMENT .

         1.       CLINICAL MONITORING

IBAH will assign a global team of experienced CRAs to perform pre-study
qualification, initiation, interim and closeout site visits. Deployment of
CRAB, in terms of number and frequency of visits, will be managed based on
Cubist input, geographic location and site-specific enrollment data.

IBAH's site management and monitoring procedures will be performed in
accordance with GCP to ensure each investigative site's compliance with
regulations and protocol requirements and to enhance expeditious enrollment
of appropriate patients into the clinical study. Regulatory documents will be
reviewed by the CRA on an ongoing basis during the study conduct phase,
including verification of signed informed consent forms and investigator IRB
notifications.

Once all regulatory documents and approvals are received, a site initiation
visit will be scheduled. During this visit, the CRA will review the study
goals, protocol (with particular attention to inclusion/exclusion criteria,
enrollment plan/goal, adverse events, primary efficacy variables and GCP
compliance), CRF completion, and clinical supply dispensation/accountability
will be performed with the investigator and his/her staff.

*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

<PAGE>

                                       -11-


The Clinical Monitoring Plan will provide Project specific guidance for
source data verification requirements at the project level. This document
will be prepared by the Clinical Trial Manager will be signed off by Cubist.

Drug accountability visits will be performed, as well as reconciliation and
removal of clinical supplies at study closeout per Cubist's requirements. In
general, the CRAs' efforts will be focused on source document verification
and expedient data retrieval.

         2.       CLINICAL GRANTS ADMINISTRATION

As a follow-up to the Investigator Agreement negotiation process, an extension
of the IBAH contracts group will administer the clinical grant payments to the
site. Included in their responsibilities are the following:

   o Process financial records for all of the patients in the study
   o Issue initial and interim payments for each investigator
   o Reconcile all payments to each of the investigators prior to
     the final payments o Track account administration with IBAH's finance
     group
   o Maintain W9 forms and all relevant and related government reports
     (U.S. only)

Investigator grants, within parameters defined by Cubist, will be passed
through at cost to Cubist. A grant administration fee will be applied, based
on the number of sites and payments to be managed throughout the duration of
the study.

         3.       CRF TRACKING, FILING AND ARCHIVING

Completed CRFs received from investigative sites, ancillary CRF pages,
adverse event documentation, and patient-specific correspondence for each
study will be logged in and tracked at IBAH. Of these items, CRFs and
answered data queries will be entered page-by-page into a computerized
tracking system. Fees reflect logging, copying, filing; and ongoing CRF
tracking time. A final, complete page listing and original CRFs will be
provided to Cubist upon Project completion. Cubist will be billed for the
actual number of pages logged/tracked.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.


<PAGE>

                                       -12-


         4.       MEDICAL MONITORING (DURING BUSINESS HOURS)

IBAH's U.S. and International Medical Monitor will oversee the medical
aspects of Cubist's clinical program. In addition to acting as medical
advisors to the Project Team, the Medical Monitors will be responsible for
the following:

   o Project planning
   o Review of clinical documentation (protocol, CRF, sample informed
     consent form)
   o Project-specific medical training o Evaluate patient eligibility (in
     conjunction with the Medical Director of Cubist)
   o Participate in team meetings
   o Review study reports, regulatory submissions and study manuscripts

        5.       SAFETY REVIEW OF CRFS

Prior to data entry, a U.S. and International Safety Officer will review all
pages of each case, ancillary laboratory pages and all data clarification
requests. Cubist will be notified immediately of serious adverse events (SAES)
that have not been previously reported by the sites. Notification will occur by
telephone, as well as by forwarding to Cubist an SAE form. The SAE form will
include details of the SAE obtained from the investigative site and will be sent
via facsimile to the designated recipient at Cubist. As follow-up information is
obtained by IBAH, the SAE form will be updated and forwarded to Cubist.

         6.       SAE REPORTING WITH INITIAL DESCRIPTIVE SUMMARIES

Within one IBAH business day of receipt, IBAH will forward to Cubist all SAE
information received from site personnel or IBAH CRAB. Notification to Cubist
will occur via telephone, as well as by forwarding a comprehensive SAE form via
facsimile. Cubist will be responsible for reporting SAEs to the FDA. IBAH's
International staff will report SAEs to non-U.S. agencies. The fee for SAE
reporting includes costs for IBAH to provide all follow-up information and to
update SAE forms as necessary. At the time of receipt of the CRF in house SAE
reports will be reconciled with the CRF. Cubist will be billed for the actual
number of SAE reports.

IBAH will provide initial descriptive patient summaries for all identified
serious adverse events. The descriptive narratives will be written from
information provided by the investigator on the SAE report forwarded to IBAH at
the time of the event. If significant follow-up information becomes available,
the narrative will be updated accordingly.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.


<PAGE>

                                       -13-


         7.       SAFETY PHONE COVER (INTERNATIONAL)

During business hours, IBAH has a direct number to IBAH's Safety Surveillance
Department for receipt of SAE information. During evening hours, weekends and
holidays, a designated member of the Safety Surveillance Department are on call
via beeper. All return calls to the sites will be made immediately to obtain the
necessary SAE information and to determine the necessity of an SAE report.

D.       CLINICAL DATA MANAGEMENT

         1.       DATA MANAGEMENT PLAN

IBAH's Clinical Data Manager will develop a Global Data Management Plan. This
plan will include the entry and review guidelines, automated edits checks of the
data, dictionary coding procedures, and central laboratory loading procedures.
Any other data management tasks requested for this Project will also be outlined
in this plan.

         2.       PROJECT DATABASE CREATION

Data screens will be developed by IBAH's programming group on an Open VMS System
(Alpha 4100) using Domain/CLINTRIAL(R) software. IBAH's Programmers will develop
data-entry screens (i.e., CRF data module designs) that mimic the flow of the
CRF, thereby improving the ease and integrity of the data-entry process.

         3.       DATA ENTRY, CASE REPORT FORM REVIEW AND QUERY RESOLUTION

IBAH's data-entry specialists will enter all CRF data utilizing a double-entry
method. On-line edit checks will be included to provide additional controls
against categorically incorrect data. The dual data-entry strategy will utilize
numeric and/or text fields that are entered by one member of the data-entry
staff and re-entered on-line by a second member of the staff. Cubist will be
billed for the actual number of pages entered.

IBAH will generate protocol-specific guidelines that are reviewed and
approved by Cubist. Using these guidelines, IBAH will conduct a detailed
quality control (QC) review of the entire CRF through a combination of manual
review and electronic edit checks that will identify conflicting, unclear or
incomplete data. IBAH's Clinical Data Analysts (CDAs) will perform this
review. IBAH's CQA will oversee these activities and may, in its discretion,
perform audits to ensure quality as part of this data service deliverable. If
data are unclear, conflicting or incomplete, then queries will be generated
and transmitted to the investigative site and IBAH"s Client Services
Department. All queries (issued and resolved) will be logged into the IBAH
tracking system. IBAH's query database will be maintained throughout the
Project and can provide Cubist with an up-to-date report on the status of
queries on an as-needed basis. Cubist will be billed for the actual number of
pages reviewed.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.


<PAGE>

                                       -14-


In addition, each case will be printed as a data listing with 100%
verification of critical data fields and text fields against the hard-copy
CRF. Also, [ ]*% of the patients will be verified for 100% of the data fields
prior to the closing of the database. Standard and protocol-specific edit
checks will be created and results of the edit checks will be reviewed by the
CDA during the review process and prior to database closure for the
generation of queries. All verification will be documented.

         4.       DICTIONARY PROCESSING

IBAH will use MedDRA for coding adverse events and WHO-DRUG for coding
medications. A Cubist-modified dictionary can be accommodated at an
additional fee to cover loading and validation of Cubist's dictionaries, as
well as development of a mapping code. Upon the mutual agreement of the
parties, ICD-9 for presenting conditions and diagnoses will be provided at an
additional fee.

IBAH will use standard coding conventions for the mapping procedure unless
otherwise instructed at the Project start. An additional cost will be
incurred by Cubist for changes to coding conventions after Project start. An
automated process will be used to map literal text to the corresponding term
in the dictionary. Unmapped terms will be researched, coded, and reviewed by
a dedicated team. Dictionary reports will be inclusive of automated and
manually coded terms and will be reviewed by IBAH's Medical Monitors prior to
database closure.

         5.       LABORATORY DATA PROCESSING (CENTRAL)

TRANSFER AND VERIFICATION OF CENTRAL LABORATORY DATA

IBAH will develop the programs needed for conversion and integration of
central laboratory data. Central lab data sets will be loaded into the
clinical database. Accession numbers from the laboratory hard copy received
with the case will be entered into the database. Verification will compare
the header data received electronically against the case data including the
patient number, lab date, date of birth, gender, patient initials, and lab
accession numbers. Discrepancies will be communicated to the central lab
and/or Cubist. Full lab panel validation will be performed on [ ]*% of the
patients to verify accuracy of the load. IBAH assumes that all laboratory
results will be forwarded with the appropriate normal range and flag attached
at the record level.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

<PAGE>

                                       -15-


         6.       RECONCILIATION OF THE SAFETY AND CLINICAL DATABASES

IBAH will maintain a safety database for Cubist. The safety database will be
reconciled with IBAH's clinical database for the Project prior to database
closure. Discrepancies will be queried to the safety surveillance department
and to the investigator sites as needed.

         7.       SECURITY PROCEDURES

All files, including data and programming, will be backed-up daily and a
complete tape will be sent to secure storage off-site on a weekly basis for
disaster recovery. All personnel maintain their own log-on IDs and all
passwords are changed monthly. Only authorized personnel have access to
databases, which have additional unique access codes. Data access codes are
changed upon database review and closure to allow only authorized personnel
access to the database.

As part of routine documentation, a controlled procedure will be used to
archive two sets of tapes containing all pertinent system files employed in
the Project; (i.e., Domain/CLINTRIAL(R) software, data sets, screen modules,
SAS programming, and listing files).

         8.       MACHINE PROCESSING AND STORAGE

IBAH's Database Administrator will maintain the integrity of Cubist's
clinical database for the duration of the Project estimated at [ ]* months.

E.       BIOMETRICS ANALYSIS AND TABLE GENERATION

         1.       STATISTICAL ANALYSIS PLAN/DESIGN OF TABLE SHELLS

A statistical analysis plan, including operational definition of endpoints to
be analyzed, definition of patient subsets (evaluable and intent-to-treat),
visit windows, rules for data handling, and a detailed description of
statistical methodology, will be prepared for the study. The statistical plan
will include a set of formatted shells for all data displays (data listings,
summary tables and graphics) planned for the study, which will be prepared
with input from the Clinical Writing Department. If formatted data displays
are not required, a detailed table of contents of SAS generated data displays
will be included. This (analysis) plan will be submitted to Cubist for review
and approval sixty days prior to closing the database for analysis.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

<PAGE>

                                       -16-

         2.       RANDOMIZATION

IBAH's Project statistician will generate a randomization schedule according
to the study design specified in the protocol. Electronic copies of the
randomization will be created for loading into the clinical database at the
time of database closure. Electronic and paper copies of the randomization
are stored in a secured location in accordance with IBAH SOPs. Fees include
verification and review by a senior biostatistician. A randomization list
will be distributed to the sites.

         3.       PROJECT DATA SETUP AND PROGRAMMING OF DATA DISPLAYS

Prior to programming actual data displays (data listings, summary tables and
graphics), IBAH will develop data display headers and create the status data
set and efficacy data set, if needed, which will be used for the data
analysis. After approval of the prototype data display formats by Cubist and
the IBAH Project Team, IBAH's programming staff will develop the programs
required to generate each data display. Programming will be performed using
SAS system software, and will incorporate procedure output and customized
report writing features. Any changes to data display formats after approval
and programming initiation could result in additional charges.

         4.       QUALITY CONTROL PROCEDURES FOR DATA DISPLAYS

IBAH's Biometrics staff will use a combination of independent programming,
hand tabulations from supporting listings, and programming verification to
ensure the accuracy and completeness of tables, listings, and statistical
results. All report data displays will be verified for accuracy and internal
consistency among data displays. A quality control binder, including the
quality control strategy for each data display and audit trail, will be
included in the Project file.

         5.       PATIENT EVALUABILITY AND OUTCOME ASSESSMENT

Patient evaluability, outcome assessment criteria and relevant algorithms
will be developed for the Project by IBAH and presented to Cubist for review
and approval. These algorithms will be programmed using SAS to identify
evaluable patients and outcome assessments. IBAH's Biostatisticians will
verify the accuracy of the output with independent programming and review of
individual patient data. Final decisions regarding patient evaluability and
outcome assessment will require approval by Cubist; these are performed once
for each patient.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

<PAGE>

                                       -17-

Data listings for each patient's evaluability status and outcome assessment
will be prepared and submitted to Cubist for classification prior to breaking
the blind. Data classification meetings may be held either in person or via
teleconference.

         6.       STATISTICAL ANALYSIS

Statistical analysis, in accordance with the approved statistical analysis
plan, will be performed by IBAH staff biostatisticians. The analysis includes
verification of assumptions needed for statistical inference, determination
of investigator-by-treatment interaction, and examination of outlying data
points.

Statistical findings which may not be appropriate for the body of a clinical
report (e.g., tests for interaction, data distribution issues, etc.),
deviations from the planned analyses, and additional exploratory analyses
will be included in a statistical appendix to the clinical report. Fees
include one major revision and one minor revision.

The Project statistician will also review the clinical reports to ensure
appropriate representation of statistical methodology and inference.

         7.       DATA LISTING AUDIT

A percentage of quality-controlled data listings may, at IBAH's discretion,
be chosen for an audit. From this, a percentage of patients will be chosen
within each selected listing for audit. The data listing information will be
verified against the selected patient(s) cases. The audit will take place
once the listings are determined to be final by IBAH's Biometrics Department.
IBAH's CQA will oversee these activities to ensure quality as part of this
service deliverable.

         8.       SUMMARY TABLES AUDIT

Following the generation of tables and listings by IBAH's Biometrics staff,
IBAH may, at its discretion, review a proportion of the summary tables,
focusing on critical data elements, against the supporting data listings to
independently verify the accuracy of the data and consistency of format.
IBAH's CQA will oversee these activities to ensure quality as part of this
service deliverable.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

<PAGE>

                                       -18-

         9.       DATA TRANSFER

At the conclusion of the study, IBAH will transfer the Project database to
Cubist in standard IBAH SAS data sets using IBAH standard naming conventions
and format. All variables within these data sets as well as variables in
analytical or summary data sets will be clearly labeled, so that SAS CONTENTS
will carry clear labels enabling variables to be traced back to CRFs. IBAH
will include any and all FORMAT LIBRARIES, SAS MACROS, or MACRO CATALOGS (if
applicable) which were used in the analyses. All SAS programs, which generate
data displays, listings, tables, graphics, and statistical analyses, will be
included in the transfer. Upon the mutual agreement of the parties,
customized data transfers, or interim database closes and transfers, will be
accommodated on request at an additional fee.

         10.      ITEM 11 PREPARATION FOR FDA

A MAP detailing the origin of each table or data display expressed in terms
of both data sets and programs will be included in the transfer, so that each
table or display can be traced to the SAS program and SAS data sets from
which it was produced. A written definition for computed variables, which may
appear in IBAH-created analytical files, or summary files will be included in
the transfer. An annotated CRF, which maps to the SAS data sets on a variable
by variable level, will be included in the transfer.

F.       CLINICAL WRITING

         1.       PHASE III CLINICAL STUDY REPORTS

Integrated clinical and statistical summaries will be prepared in accordance
with ICH guidelines. Draft clinical reports will be generated within [ ]*
after receipt of final summary tables and patient listings.

The fee for this report includes up to [ ]* brief patient narratives and one
major and one minor revision. [ ]* of the draft report is considered not to
take more than [ ]* days after receipt of all requests for changes, and a
minor revision will consist of changes that can be completed in [ ]*. This
fee does not include collation and assembly of appendices.

Writing fee estimates are based on receipt of final data. If any changes
should occur after work on the reports has begun, IBAH assumes that these
changes will not impact the production of the report. If database changes
occur which require a substantial amount of time [ ]* for rework or repeat
quality control, additional fees will be agreed upon with Cubist before
proceeding with the reports.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

<PAGE>

                                       -19-

         2.       CLINICAL AUDIT

IBAH may, at its discretion, perform an audit of the clinical study report. The
clinical study report audit will examine the consistency between text and
figures quoted in the version of the report agreed upon with Cubist, with those
appearing in the statistical tables and listings which accompany the report.
This audit will include a review of all sections for format consistency and
table of contents cross-reference. In addition, text and figures will be
verified against the verified tables/listings and any typographical and
grammatical errors that are noted. This audit is performed on the final version,
following incorporation of Cubist's comments. IBAH's CQA will oversee these
activities to ensure quality as part of this service deliverable.


(Rest of page intentionally left blank)














*Confidential treatment requested: Material has been omitted and filed with the
 Commission.


<PAGE>

                                       -20-

V.       FINANCIAL CONSIDERATIONS

A.       UNITED STATES BUDGET

[  ]*

B. INTERNATIONAL BUDGET

[  ]*

C.       PAYMENT SCHEDULES

         1.       INVOICING PROCESS FOR SERVICE FEES

IBAH maintains a project accounting system, whereby all direct project costs
(service or passthrough expenses) are coded by project.

An initial payment of [ ]* representing approximately [ ]* of Project costs,
is due and payable upon execution of this Exhibit B. Subsequent payments
shall be made monthly, based on Project progress and upon submission of an
invoice to Cubist by IBAH. The subsequent invoices shall be reduced by a
prorated portion from the initial payment such that the initial payment is
applied evenly over the term of the Project. All payments shall be processed
within [ ]*. If any payment of service fees or pass through expenses is late
by more than [ ]*, such payment shall be subject to a penalty fee of [ ]* per
month of the outstanding balance.

         2.       PASS THROUGH EXPENSE INVOICING

Grant Payments - IBAH will invoice [ ]* days in advance of grant payments due
investigators based on estimates.

IBAH requires payment from Cubist at least [ ]* days in advance of the actual
payment to investigators. Payments to investigators will not be released
until payments are received by IBAH from Cubist. Upon Cubist's request, IBAH
agrees to deposit payments from Cubist into a non-interest bearing bank
account. IBAH shall draw upon such account to make the investigator payments.
Any remaining funds in the account will be returned to Cubist after the
termination of the study, as soon as all contracted obligations to the
investigators have been satisfied.

In the event payments from Cubist are insufficient to cover the payments to
investigators, Cubist will promptly advance funds to IBAH for the amount of
grant payments required.


*Confidential treatment requested: Material has been omitted and filed with the
 Commission.


<PAGE>

                                       -21-


IBAH's project accounting system is able to capture and categorize in summary
the following key pass-through expenses related to a project:

o   Travel
o   Delivery fees
o   CRF and other printing costs
o   All other project related expenses that are not related to service fees and
    any additional detail to support pass-through costs will be provided on a
    fee basis.

         3.       ANNUAL PRICE INCREASE

Notwithstanding anything contained herein to the contrary, the estimated
Service Fees set forth in this Exhibit B shall remain in effect for the
longer of (a) [ ]* from the date hereof, or (b) [ ]* following the date
hereof. Thereafter, IBAH reserves the right to increase the price of the
remaining Services under this Exhibit B as of each January l; such increases
shall not exceed [ ]*.

VI.      SIGNATORY AUTHORITY

The parties acknowledge and agree that Cubist has authorized IBAH to execute
all Clinical Study Agreements with investigators in the Project on behalf of
Cubist. Cubist understands and acknowledges that it will be bound by the
terms of the investigator agreements.

ACCEPTANCE

The terms and conditions of the Master Agreement govern this Exhibit B and
such document is incorporated herein by reference as if fully set forth
herein.

BY AND BETWEEN:

CUBIST PHARMACEUTICALS, INC.                 IBAH, INC.


By:  /S/ MICHAEL DEBRUIN                     By: /S/ LEONARD F. STIGLIANO
     -------------------                         ------------------------

Name: Michael DeBruin                        Name:  Leonard F. Stigliano

Title: Vice President-Clinical Research      Title:  President, U.S. CRO

Dated: April 2, 2000                         Dated: April 12, 2000




*Confidential treatment requested: Material has been omitted and filed with the
 Commission.

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.52
<SEQUENCE>5
<FILENAME>a2042768zex-10_52.txt
<DESCRIPTION>EXHIBIT 10.52
<TEXT>

<PAGE>


                                                                   EXHIBIT 10.52

                             CONFIDENTIAL TREATMENT


               EXHIBIT C TO THE CLINICAL SERVICES MASTER AGREEMENT
           BETWEEN CUBIST PHARMACEUTICALS, INC. AND IBAH, INC., DATED
                                DECEMBER 1, 1999.

         This Exhibit C is entered into this 18th day of April, 2000, by and
between Cubist Pharmaceuticals, Inc. (hereinafter "Cubist" and IBAH, Inc.
(hereinafter "IBAH").

         WHEREAS, Cubist and IBAH entered into a Clinical Services Master
Agreement, dated December 1, 1999 (hereinafter the "Master Agreement"), wherein
IBAH agreed to provide clinical services and;

         WHEREAS, Cubist and IBAH agree that IBAH shall provide the services set
forth in this Exhibit C, subject to the terms and conditions set forth in the
Master Agreement;

         NOW, THEREFORE, for good and valuable consideration, AND INTENDING TO
BE LEGALLY BOUND, Cubist and IBAH agree as follows:

I.       PROJECT PLAN

Based on the Project Specifications, IBAH has provided a description of services
to be performed for Cubist's Evaluation of Daptomycin in subjects with Renal
Insufficiency Program, Protocol Number DAP-00-01 (hereinafter the "Project") and
associated costs. Changes made in the Project scope, at any time during the
Project, will result in a.. corresponding adjustment to the Project costs.

II.      PROJECT RESPONSIBILITIES

<TABLE>
<CAPTION>

- --------------------------------------------------------------------------------------------------------------
                               ACTIVITY                                       CUBIST              IBAH
- --------------------------------------------------------------------------------------------------------------
<S>                                                                       <C>                   <C>

- --------------------------------------------------------------------------------------------------------------
A.       STUDY INITIATION
- --------------------------------------------------------------------------------------------------------------
Protocol Development                                                             X
- --------------------------------------------------------------------------------------------------------------
Protocol Review                                                                  X
- --------------------------------------------------------------------------------------------------------------
CRF Design                                                                       X                  X
- --------------------------------------------------------------------------------------------------------------
Printing, Assembly, and Distribution of CRFs                                                        X
- --------------------------------------------------------------------------------------------------------------
Preparation of Randomization Codes                                               X
- --------------------------------------------------------------------------------------------------------------
Identification and Qualification of Sites (assumes 1 site)                       X
- --------------------------------------------------------------------------------------------------------------
Investigator Document Retrieval                                                  X
- --------------------------------------------------------------------------------------------------------------
Negotiation of Phase I Unit Grant                                                X
- --------------------------------------------------------------------------------------------------------------
Training Site Personnel                                                          X                  X
- --------------------------------------------------------------------------------------------------------------
Training Project Team                                                            X                  X
- --------------------------------------------------------------------------------------------------------------
Analytical Laboratory Identification and Coordination                            X
- --------------------------------------------------------------------------------------------------------------
</TABLE>


*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -2-


<TABLE>
<CAPTION>

- --------------------------------------------------------------------------------------------------------------
                               ACTIVITY                                       CUBIST              IBAH
- --------------------------------------------------------------------------------------------------------------
<S>                                                                       <C>                   <C>

- --------------------------------------------------------------------------------------------------------------
B.       STUDY CONDUCT
- --------------------------------------------------------------------------------------------------------------
Project Management                                                               X                  X
- --------------------------------------------------------------------------------------------------------------
Conduction of Qualification, Initiation, Interim, and Closeout Visits            X                  X
- --------------------------------------------------------------------------------------------------------------
Verification of CRFs at Phase I Unit                                                                X
- --------------------------------------------------------------------------------------------------------------
Document Corrections to CRFs                                                                        X
- --------------------------------------------------------------------------------------------------------------
Site Visit Report Preparation                                                                       X
- --------------------------------------------------------------------------------------------------------------
Collection and Tracking CRFs                                                                        X
- --------------------------------------------------------------------------------------------------------------
Administration of Grant Payment(s)                                               X
- --------------------------------------------------------------------------------------------------------------
Reporting SAES to Regulatory Agency                                              X
- --------------------------------------------------------------------------------------------------------------
Reporting SAES to Cubist                                                                            X
- --------------------------------------------------------------------------------------------------------------
Assuring Disposal of Unused Supplies                                             X
- --------------------------------------------------------------------------------------------------------------
C.       CLINICAL DATA MANAGEMENT, BIOMETRICS, AND CLINICAL WRITING
- --------------------------------------------------------------------------------------------------------------
Custom Database Design                                                                              X
- --------------------------------------------------------------------------------------------------------------
CRFs Entry Into Database                                                                            X
- --------------------------------------------------------------------------------------------------------------
Generation and Resolution of Data Queries                                                           X
- --------------------------------------------------------------------------------------------------------------
Coding of Data Using IBAH Dictionaries                                                              X
- --------------------------------------------------------------------------------------------------------------
Verification/QC Database                                                                            X
- --------------------------------------------------------------------------------------------------------------
Loading & Verification of Laboratory Data                                                           X
- --------------------------------------------------------------------------------------------------------------
Database Closure                                                                                    X
- --------------------------------------------------------------------------------------------------------------
Statistical Plan and Tables Design                                                                  X
- --------------------------------------------------------------------------------------------------------------
Sample Size Calculation                                                          X
- --------------------------------------------------------------------------------------------------------------
Generation of Tables/Listings                                                                       X
- --------------------------------------------------------------------------------------------------------------
Statistical Analysis                                                             X                  X
- --------------------------------------------------------------------------------------------------------------
Database Transfer                                                                                   X
- --------------------------------------------------------------------------------------------------------------
Integrated Clinical Report                                                                          X
- --------------------------------------------------------------------------------------------------------------
</TABLE>

III.     CLINICAL PROGRAM DESIGN

A.       STUDY SYNOPSIS

TITLE:              Evaluation of the Elimination and Safety Profile of
                    Daptomycin in Subjects with Graded Renal Insufficiency,
                    End-Stage Renal Disease, and Healthy Volunteers

SPONSOR:            Cubist Pharmaceuticals, Inc.

CLINICAL            PHASE: Phase I

NUMBER OF
STUDY CENTERS:      One (1)

OBJECTIVES:         Primary:

                    o To determine the elimination profile of single-dose
                      daptomycin in healthy volunteers and in subjects with
                      various stages of renal insufficiency

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>
                                      -3-


                    Secondary:

                    o To compare the safety profile of single-dose daptomycin
                      in healthy volunteers and in subjects with graded
                      renal failure and end-stage renal disease

                    o To measure the effects that hemodialysis and peritoneal
                      dialysis have on the renal clearance of daptomycin under
                      both dialysis and non-dialysis conditions

                    o To assess the effects that probenecid has on the renal
                      tubular secretion of daptomycin

SUBJECT NUMBER:     A minimum of [ ]* patients with varying degrees of renal
                    impairment, including a normal renal function group.

STUDY DRUG(S):      Daptomycm

STUDY ENDPOINTS:    PRICE:

                    The elimination profile will be obtained from analysis of
                    plasma, serum, urine, and dialysate samples, from subjects
                    with graded renal insufficiency and healthy volunteers.

                    SECONDARY:

                    The daptomycin safety profile data will be obtained through
                    the monitoring of adverse events, chemistry (including
                    serum CPK), hematology, and urinalysis data.


B.       MONITORING VISIT INFORMATION

[   ]*

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -4-


C.       CLINICAL DATA INFORMATION

The estimated number of CRF pages is based on a [ ]*-page CRF for [ ]* patients.
CRF pages for patients who fail screening will not be reviewed by IBAH for
safety or data-entered unless requested by Cubist.

<TABLE>
<CAPTION>

- -------------------------------------------------------------------------------
DESCRIPTION                                                           NUMBER

- -------------------------------------------------------------------------------
<S>                                                                 <C>

Estimated Number of CRF pages                                          [ ]*
- -------------------------------------------------------------------------------
Estimated Number of Tables/Listings:
         Primary                                                       [ ]*
         Subset                                                        [ ]*
- -------------------------------------------------------------------------------
</TABLE>

IV.      DESCRIPTION OF SERVICES

A description of services to be performed by IBAH's is described below. Changes
made by Cubist and agreed to by IBAH in the Project scope, at any time during
the program, will result in a corresponding adjustment to the Project costs.

A.       STUDY MANAGEMENT

1.       PROJECT MANAGEMENT

IBAH will assign a Project Manager who will act as a single point of contact for
Cubist throughout the life of the Project. The Project Manager will work with
one of IBAH's staff physicians who will be assigned to the Project as the
Medical Monitor. The Project Manager's responsibilities may include, but not be
limited to, the following:

         o        Act as primary contact for Cubist and for the investigative
                  site

         o        Prepare and tracking detailed timelines

         o        Ensure milestones are met

         o        Ensure effective communication among all members of the
                  Project team

         o        IBAH Project team training

         o        Identify and resolve critical issues

         o        Manage financial issues

IBAH will provide clerical and administrative support for the Project to assist
with various tasks. Such tasks may include, but not be limited to, communication
(phone, facsimile, mailings), machine processing and storage, coordination of
teleconferences and meetings, and preparation of administrative reports.
Printing, assembly, shipping and distribution of CRFs, Federal Express and/or
overnight carrier and study-related travel, will be passed through at cost to
Cubist.

2.       CRF DESIGN AND PRINTING

Upon approval of a final protocol by Cubist, IBAH will design a CRF to record
pertinent data. IBAH's Data Management staff, Biometrics staff, and the Clinical
Trial Manager

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -5-


(CTM) will review the CRF and provide input to ensure all relevant data are
captured. Cubist will be provided with ready-to-use multicopy carbonless forms.
IBAH will ship CRFs to site. Such shipping costs will be passed through to
Cubist.

B.       STUDY CONDUCT

1.       CLINICAL MONITORING

IBAH's CRA will perform initiation, interim and a closeout visit at the
investigational site. IBAH's site management and monitoring procedures will be
performed in accordance with Good Clinical Practices to ensure investigative
site compliance with regulations and protocol requirements. IBAH's CRA will
ensure protocol procedure compliance, and will be available at the time of first
dosing if required by Cubist and agreed upon by IBAH. IBAH's CRA will review
source data and CRF data for appropriate identification, documentation and
reporting of both serious and non-serious adverse events. Drug accountability
will be performed by IBAH's CRA at each interim visit and at the closeout visit.
The completed CRFs will be retrieved and reviewed at each visit. All IBAH travel
expenses related to this study will be passed through to Cubist.

2.       SAE REPORTING WITH INITIAL DESCRIPTIVE SUMMARIES

All serious adverse events (SAES) will be forwarded to Cubist within one IBAH
business day of receipt. Notification to Cubist will occur via telephone, as
well as by receipt of a comprehensive SAE form. In the event that follow-up
information is required for an event (hospital discharge summary, etc.), IBAH's
Safety Surveillance Department will periodically contact the site until
information is obtained and the SAE form is updated as necessary.

IBAH will provide initial descriptive patient summaries for all identified
serious adverse events. The descriptive narratives will be written from
information provided by the investigator on the SAE report forwarded to IBAH at
the time of the event. If significant follow-up information becomes available,
the narrative will be updated accordingly.

3.       CRF TRACKING, FILING, AND ARCHIVING

Completed case report forms, ancillary CRF pages, adverse event documentation,
and patient and site-specific correspondence for the study will be logged in and
tracked at IBAH. CRFs and answered data queries will be submitted to the IBAH
document management group for a page-by-page entry into a computerized tracking
system. A photocopy will be made within the same business day the CRF arrives
and the original CRF will be filed in a central document unit at IBAH. The copy
will be circulated throughout the various departments at IBAH as a working copy.
Fees reflect an additional 20% of the estimated CRF pages to cover logging,
copying, filing, and ongoing CRF tracking time for all pages. A final, complete
page listing and the original CRFs will be provided to Cubist upon Project
completion. The fee charged will reflect the actual number of pages tracked.
Pages for screened volunteers will be tracked and filed.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -6-


C.       CLINICAL DATA MANAGEMENT

1.       PROJECT DATABASE CREATION AND DATA ENTRY

Data screens will be developed by IBAH's programming group on an Open VMS System
(Alpha 4100) using Domain/CLINTRIAL(R) software. IBAH's Programmers will develop
data-entry screens (i.e., CRF data module designs) that mimic the flow of the
CRF, thereby improving the ease and integrity of the data-entry process. All
screen programs will undergo testing at IBAH prior to initiation of the
full-scale data entry effort.

IBAH's Data Entry Specialists will enter all CRF data by utilizing a
double-entry method. On-line edit checks will be included to provide additional
controls against categorically incorrect data. The double data entry strategy
will utilize numeric and/or text fields that are entered by one member of the
data entry staff 'and re-entered on-line by a second member of the staff. All
data will be double-entered at IBAH, with the exception of comment fields, which
will be quality controlled on-line.

In addition to the double-entry strategy, each case will be printed as a data
listing with 100% verification of critical data fields and text fields against
the hard copy CRF by one of IBAH's Clinical Data Analysts (CDA). Also, [ ]*% of
the volunteers will be verified for 100% of the data fields prior to the closing
of the database. Standard and protocol-specific edit checks will be created and
results of the edit checks will be reviewed by the CDA during the review process
and prior to database closure for the generation of queries. All verification
will be documented.

The estimated fee for data entry of CRFs is based on CRF pages entered. Actual
pages will be invoiced. This page estimate is based on randomized volunteers
only and does not include entry of any screen failure volunteers. Any ancillary
pages (e.g., Labs, EKGs, etc.) that are not included in the CRF estimate will be
viewed as additional pages and an additional fee will be charged.

2.       CASE REPORT FORM REVIEW AND QUERY RESOLUTION

IBAH will generate protocol-specific guidelines, which will be reviewed and
approved by Cubist. Using these guidelines, IBAH will conduct a detailed quality
control (QC) audit of the entire CRF through a combination of manual review and
electronic edit checks that will identify conflicting, unclear, or incomplete
data. This review will be performed by CDAs who are independent of the Medical
Monitor involved with the Project.

If data are unclear, conflicting or incomplete, then data clarification requests
(DCRs) will be generated and transmitted to the investigative site(s) and the
Medical Monitor. All DCRs (issued and resolved) will be logged into the IBAH
tracking system. IBAH's DCR database will be maintained throughout the project
and can provide Cubist with an

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>
                                      -7-


up-to-date report on the status of DCRs on an as needed basis. The fee for
generation and resolution of data queries is included in the data entry
estimate.

3.       DICTIONARY PROCESSING

IBAH will use MedDRA for coding adverse events and WHO-DRUG for coding
medications. IBAH will use standard coding conventions for the mapping procedure
unless otherwise instructed at the study start. An additional cost will be
incurred for changes to coding conventions after study start. An automated
process will be used to map literal text to the corresponding term in the
dictionary. Unmapped terms will be researched, coded, and reviewed by a
dedicated team.

Dictionary reports will be inclusive of automated and manually coded terms and
will be reviewed by Cubist.

4.       LABORATORY DATA PROCESSING (CENTRAL)

TRANSFER AND VERIFICATION OF CENTRAL LABORATORY DATA

IBAH will develop the programs needed for conversion and integration of central
laboratory data. Central lab data sets will be loaded into the clinical
database. Accession numbers from the laboratory hard copy received with the case
will be entered into the database. Verification will compare the header data
received electronically against the case data including the patient number, lab
date, date of birth, gender, patient initials, and lab accession numbers.
Discrepancies will be communicated to the central lab and/or Cubist. Full lab
panel validation will be performed on [ ]* of the patients to verify accuracy of
the load. IBAH assumes that all laboratory results will be forwarded with the
appropriate normal range and flag attached at the record level.

5.       DATA TRANSFER

At the conclusion of the study, IBAH will transfer the Project database to
Cubist in standard IBAH SAS data sets, using IBAH's standard naming conventions
and format. Upon the mutual written agreement by the parties, customized data
transfers, or interim database closes and transfers, will be provided for an
additional fee.

6.       SECURITY PROCEDURES

All files, including data and programming, will be backed-up daily and a
complete tape will be sent to a secure storage off-site on a weekly basis for
disaster recovery. All personnel maintain their own log-on Ids and all passwords
will be changed monthly. Only authorized personnel will have access to
databases, which have additional unique access codes. Data access codes will be
changed upon database review and closure to allow only authorized personnel
access to the database.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -8-


As part of routine documentation, a controlled procedure will be used to archive
two sets of tapes containing all pertinent system files employed in the project
(i.e., Domain/CLINTRIAL(R) software, data sets, screen modules, SAS programming,
and listing files).

7.                   MACHINE PROCESSING AND STORAGE

IBAH's Database Administrator will maintain the integrity of Cubist's clinical
database for the duration of the Project.

D.       BIOMETRICS

1.       PROJECT DATA SETUP AND PROGRAMMING OF DATA DISPLAYS

Prior to programming actual data displays (data listings, summary tables and
graphics), IBAH will develop data display headers and create the status data set
and efficacy data set, if needed, which will be used for the data analysis.
After approval of the prototype data display formats by Cubist and the IBAH
Project Team, IBAH's programming staff will develop the programs required to
generate each data display. Programming will be performed using SAS system
software, and will incorporate procedure output and customized report writing
features. Any changes to approved data display formats will result in additional
charges. IBAH assumes that Cubist will be responsible for providing the table
design and statistical plan for the study.

Fees are based on an estimate of the total number of primary and secondary data
displays. However, the cost will be based on the actual number of data displays
generated. Primary data displays are considered new code development. Secondary
data displays are defined as those data displays utilizing much of the
programming code developed to produce the primary output. The fee for data
displays generation includes minor changes, following review by Cubist, to take
no more than [ ]* days. All additional changes to tables will result in
additional charges.

2.       QUALITY CONTROL PROCEDURES FOR DATA DISPLAYS

IBAH's Biometrics staff will use a combination of independent programming, hand
tabulation from supporting listings, and programming verification to ensure the
accuracy and completeness of tables, listings, and statistical results. All
report data displays will be verified for accuracy and internal consistency
among data displays. A quality control binder, including the quality control
strategy for each data display and audit trail, will be included in the Project
file.

3.       STATISTICAL ANALYSIS

IBAH's biostatisticians will perform statistical analysis in accordance with the
approved statistical analysis plan.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -9-


4.       DATA TRANSFER

Cubist will provide IBAH's statistician with a complete list of the data tables
to be transferred to Cubist in an Excel spreadsheet following database close.

E.       CLINICAL WRITING

1.       CLINICAL REPORT

IBAH will prepare an integrated clinical and statistical summary in accordance
with ICH guidelines. A Draft Clinical Report will be generated within three (3)
weeks after receipt of final summary tables and patient data listings.

All clinical reports will receive two independent levels of quality control
reviews before they are released. There will be a QC review by IBAH's Clinical
Writer for accuracy and consistency and a review by IBAH's Writing Manager for
accuracy, client format consistency and appropriate clinical and regulatory
prospective.

The fee for this report includes one major and one minor revision and up to [ ]*
brief patient narratives. [ ]* of the draft report is considered to be up to
[ ]* of requested changes, and a minor revision will consist of up to one-half
(1/2) day of requested changes. A final pharmacokinetic report will be provided
by Cubist. IBAH will accept the PK report as 100% accurate. IBAH will extract
the appropriate information from the PK report for inclusion in the clinical
report. The fee for this report does not include collation and assembly of the
report appendices.

The writing fee estimates are based on receipt of final data and, if minor
changes to the database occur after work on the document has begun, they will
not impact the production of the document. If database changes occur which
require a substantial amount of time [ ]* for rework or repeat quality control,
additional fees will be agreed upon in writing with Cubist before proceeding.

(Rest of page intentionally left blank)

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -10-


V.       ESTIMATED CLINICAL BUDGET

[   ]*

VI.      PROJECT TIMELINE SUMMARY

The parties acknowledge that IBAH estimates that the Project will begin on or
about [ ]*. The Project timeline is as follows:

[   ]*

VII.     PAYMENT SCHEDULES

1.       INVOICING PROCESS FOR SERVICE FEES

IBAH maintains a project accounting system, whereby all direct project costs
(service or passthrough expenses) are coded by project.

An initial payment of [ ]*, representing approximately [ ]* of Total Estimated
Service Fees, shall be due and payable upon execution of this Exhibit C.
Subsequent payments shall be made monthly, based on Project progress and upon
submission of an invoice to Cubist by IBAH. The subsequent invoices shall be
reduced by a prorated portion from the initial payment such that the initial
payment is applied evenly over the term of the Project. All payments of service
fees and pass through expenses shall be made by Cubist within [ ]* of receipt of
invoice. If any payment of service fees or pass through expenses is late by more
than [ ]*, such payment shall be subject to a penalty fee of [ ]* per month of
the outstanding balance.

2.       PASS-THROUGH EXPENSE INVOICING

IBAH's project accounting system is able to capture and categorize in summary
the following key pass-through expenses related to a project:

         o        Travel

         o        Delivery fees

         o        CRF and other printing costs

         o        All other Project related expenses that are not related to
                  service fees

Any additional detail to support pass-through costs will be provided on a fee
basis.

3.       ANNUAL PRICE INCREASE

Notwithstanding anything contained herein to the contrary, the estimated service
fees set forth in this Exhibit C shall remain in effect for the longer of (a) [
]* from the date hereof, or (b) [ ]* of the first calendar year following the
date hereof. Thereafter, IBAH reserves the right to increase the price of the
remaining Services under this Exhibit C as of each January 1; such increases
shall not exceed the [ ]*.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -11-


ACCEPTANCE

The terms and conditions of the Master Agreement govern this Exhibit C and such
document is incorporated herein by reference as if fully set forth herein.


CUBIST PHARMACEUTICALS, INC.                     IBAH, INC.

By:  /s/ MICHAEL DEBRUIN                         By:  /s/ LEONARD F. STIGLIANO
     -------------------                              ------------------------

Name:  Michael DeBruin, M.D.                     Name:  Leonard F. Stigliano

Title: Vice President, Clinical Research         Title:  President, U.S. CRO

Date: April 11, 2000                             Date: April 18, 2000


*Confidential treatment requested: Material has been omitted and filed with
the Commission.
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.53
<SEQUENCE>6
<FILENAME>a2042768zex-10_53.txt
<DESCRIPTION>EXHIBIT 10.53
<TEXT>

<PAGE>


                                                                   EXHIBIT 10.53


                             CONFIDENTIAL TREATMENT



           EXHIBIT D TO THE CLINICAL SERVICES MASTER AGREEMENT BETWEEN
                  CUBIST PHARMACEUTICALS, INC. AND IBAH, INC.,
                             DATED DECEMBER 1, 1999.

         THIS EXHIBIT D is entered into this 10th day of May, 2000, by and
between Cubist Pharmaceuticals, Inc. (hereinafter "Cubist") and IBAH, Inc.
(hereinafter "IBAH").

         WHEREAS, Cubist and IBAH entered into a Clinical Services Master
Agreement, dated December 1, 1999 (hereinafter the "Master Agreement"), wherein
BAH agreed to provide clinical services and;

         WHEREAS, Cubist and IBAH agree that IBAH shall provide the services set
forth in this Exhibit D, subject to the terms and conditions set forth in the
Clinical Services Master Agreement;

         NOW, THEREFORE, for good and valuable consideration, AND INTENDING TO
BE LEGALLY BOUND, Cubist and IBAH agree as follows:

I.       PROJECT OVERVIEW

IBAH will provide pre-NDA services in connection with the Daptomycin Program
(hereinafter "the Projects"). Changes made in the Projects scope, at any time
during the Projects, will result in a corresponding adjustment to the Project
Costs.

II.      PROJECT ROLES AND RESPONSIBILITIES

IBAH will perform pre-NDA services for the Projects as specified and requested
on an as needed basis by Cubist and agreed upon by IBAH.

III.     PROJECT TIME-LINE

IBAH commence performance of the services on or about [ ]*. Unless otherwise
agreed to in writing by the parties, the terms of this Exhibit D shall be for
[ ]*.

IV.      BUDGET

         A.       PER DIEM RATES

[ ]*

         The fees for services provided under this Exhibit D shall not exceed [
]* unless expressly requested by Cubist in writing, and agreed to in writing by
the parties.

*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>
                                      -2-


B.       PAYMENT SCHEDULES

         1.       INVOICING PROCESS FOR PER DIEM RATES

         IBAH maintains a project accounting system, whereby all direct project
costs (estimated per diem rates or pass-through expenses) are coded by project.

         All payments shall be processed within [ ]* days upon receipt of an
invoice from IBAH. If any payment is late by more than [ ]* days, such payment
shall be subject to a penalty fee of [ ]* per month of the outstanding balance.

         2.       PASS-THROUGH EXPENSE INVOICING

         IBAH's project accounting system is able to capture and categorize in
summary the following key pass-through expenses related to a project:

         o        Travel

         o        Delivery fees

         o        All other project related expenses that are not related to per
                  diem rates

         Any additional detail to support pass-through costs will be provided on
a fee basis.

         3.       ANNUAL PRICE INCREASE

         Notwithstanding anything contained herein to the contrary, the per diem
rates set forth in this Exhibit D shall remain in effect for the longer of (a)
[ ]* from the date hereof, or (b) [ ]*. Thereafter, IBAH reserves the right to
increase the price of the per diem rates under this Exhibit D as of each January
1; such increases shall not exceed the percentage change of [ ]*.

         4.       TERMS AND CONDITIONS

         The terms and conditions of the Master Agreement govern this Exhibit D
and such document is incorporated herein by reference as if fully set forth
herein.

         IN WITNESS WHEREOF, the parties have executed this Exhibit D by their
duly authorized officers.

CUBIST PHARMACEUTICALS, INC.                   IBAH, INC.

By:  /s/ MICHAEL DEBRUIN                       By:  /s/ LEONARD F. STIGLIANO
     -------------------                            ------------------------

Name:  Michael DeBruin, M.D.                   Name:  Leonard F. Stigliano

Title:  Vice President - Clinical Research     Title:  President, U.S. CRO

Dated:  April 24, 2000                         Dated:  May 10, 2000

*Confidential treatment requested: Material has been omitted and filed with
the Commission.
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.54
<SEQUENCE>7
<FILENAME>a2042768zex-10_54.txt
<DESCRIPTION>EXHIBIT 10.54
<TEXT>

<PAGE>


                                                                  EXHIBIT 10.54

                             CONFIDENTIAL TREATMENT

               EXHIBIT E TO THE CLINICAL SERVICES MASTER AGREEMENT
           BETWEEN CUBIST PHARMACEUTICALS, INC. AND OMNICARE CLINICAL
           RESEARCH. INC. (F/K/A IBAH, INC.), DATED DECEMBER 1, 1999.

     THIS EXHIBIT E is entered into this 17TH day of OCTOBER, 2000, by and
between Cubist Pharmaceuticals, Inc. (hereinafter "Cubist") and Omnicare
Clinical Research, Inc. (F/K/A IBAH, Inc.) (hereinafter "Omnicare Clinical
Research").

     WHEREAS, Cubist and Omnicare Clinical Research entered into a Clinical
Services Master Agreement, dated December 1, 1999 (hereinafter the "Master
Agreement"), wherein Omnicare Clinical Research agreed to provide clinical
services and;

     WHEREAS, Cubist and Omnicare Clinical Research agree that Omnicare Clinical
Research shall provide the services set forth in this Exhibit E, subject to the
terms and conditions set forth in the Master Agreement;

     NOW, THEREFORE, for good and valuable consideration, AND INTENDING TO BE
LEGALLY BOUND, Cubist and Omnicare Clinical Research agree as follows:

I.   PROJECT PLAN

Based on the Project specifications, Omnicare Clinical Research has provided a
description of services to be performed for Cubist's Phase III study of
Cidecin(TM) (daptomycin) in the treatment of moderate to severe
community-acquired acute bacterial pneumonia due to S. PNEUMONIAE, Protocol
Number DAP-00-05 (hereinafter "the Project") and associated costs. Changes made
in the Project scope, at any time during the Project, will result in a
corresponding adjustment to the Project costs.

A.  PROJECT STATUS TABLE

           [     ]*


*Confidential treatment requested: Material has been omitted and filed with
the Commission.

<PAGE>

II. PROJECT ROLES AND RESPONSIBILITIES

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
                                 TASK                                               CUBIST            OMNICARE
                                                                                                      CLINICAL
                                                                                                      RESEARCH
- ---------------------------------------------------------------------------------------------------------------
<S>                                                                                <C>                <C>
A.  STUDY MANAGEMENT
- ---------------------------------------------------------------------------------------------------------------
 1. Facilitate Project Management                                                                        X
    o Global Program Director - [ ]* days total
    o International Project Manager (EU) - average [ ]* days total
    o Clinical Trial Managers (North America) - [ ]* days total
    o Count Trial Managers (EU) - [ ]* days total
- ---------------------------------------------------------------------------------------------------------------
 2. Coordinate and conduct team meetings                                               X                 X
    o Omnicare Clinical Research anticipates [  ]* face-to-face meetings will
      occur during the course of this Project
    o Fee assumes [   ]* meetings to occur at Omnicare Clinical Research
      and at Cubist
- ----------------------------------------------------------------------------------------------------------------
 3. Standard Operating Procedures (SOPs)                                                                 X
- ----------------------------------------------------------------------------------------------------------------
 4. Performance tracking submitted to Cubist in a written report                                         X
- ---------------------------------------------------------------------------------------------------------------
 5. Monitor Project payment schedule                                                   X                 X
- ---------------------------------------------------------------------------------------------------------------
 6. Project problem solving                                                            X                 X
- ---------------------------------------------------------------------------------------------------------------
 7. Clerical and administrative support                                                                  X
    o North America - [       ]* days total
    o EU- [           ]* days total
- ---------------------------------------------------------------------------------------------------------------
B.  CLINICAL TRIAL INITIATION
- ---------------------------------------------------------------------------------------------------------------
  1. Drug development and study design                                                 X
- ---------------------------------------------------------------------------------------------------------------
  2. Protocol Development                                                                                X
     o Fee includes [   ]* major [     ]* and [    ]* minor [     ]* revision
- ---------------------------------------------------------------------------------------------------------------
  3. Patient plan                                                                      X
     o [    ]* patients enrolled in North America
     o [    ]* patients enrolled in International
     o [    ]* patients total
- ---------------------------------------------------------------------------------------------------------------
  4. Site plan                                                                                           X
     o North America: [   ]* sites
     o International: [   ]* sites
        Countries include: Australia, Benelux/Netherlands, Croatia,
        Czech Republic, Finland, France, Germany, Greece, Hungary, Iceland,
        New Zealand, Norway, Russia, Slovak Republic, Spain, Sweden,
        Switzerland, UK
- ---------------------------------------------------------------------------------------------------------------
  5. CRF design                                                                                          X
     o [   ]* estimated pages per patient, plus [    ]* ancillary pages
- ---------------------------------------------------------------------------------------------------------------
  6. CRF logistics (print, bind, and distribute)                                                         X
     o Material, printing and assembly expenses will be passed through at cost
</TABLE>


*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>

<TABLE>
<S>                                                                                 <C>        <C>

- ---------------------------------------------------------------------------------------------------------------
  7. Investigator identification, recruitment and qualification                                     X
     o [ ]* sites will be identified to obtain [ ]* qualified
       North American sites
     o [ ]* sites will be identified to obtain [ ]* qualified EU sites
- ---------------------------------------------------------------------------------------------------------------
  8. Investigator regulatory document management                                                    X
     o Protocol Amendments and IRB submissions billed per site o Informed
       Consent Forms development
- ---------------------------------------------------------------------------------------------------------------
  9. Certification of Investigator Financial Disclosure                                             X
- ---------------------------------------------------------------------------------------------------------------
 10. Investigator agreement negotiation                                                             X
- ---------------------------------------------------------------------------------------------------------------
 11. Coordination of investigators' meetings                                                        X
     o One meeting North America
     o Three meetings International
- ---------------------------------------------------------------------------------------------------------------
 12. Project team training                                                             X            X
- ---------------------------------------------------------------------------------------------------------------
</TABLE>



*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
                                 TASK                                               CUBIST            OMNICARE
                                                                                                      CLINICAL
                                                                                                      RESEARCH
- ---------------------------------------------------------------------------------------------------------------
<S>                                                                                <C>                <C>
B. CLINICAL TRIAL INITIATION CONT.
- ---------------------------------------------------------------------------------------------------------------
 13. IVRS System for Randomization                                                                       X
     o Fee is based on the following assumptions
     - French, Spanish, Russian, Slovak, Czech, Hungarian, German, Finnish,
       Croatian, Flemish, Swedish, Greek, and English
     - Patients are randomized to one of two treatment arms
     - Detailed specifications can take one to four weeks to develop and
       approve, based on sponsor availability
     - Validated IVRS delivered [ ]* weeks after receiving Cubist's written
       approval of detailed specifications
     - Cubist-requested changes to the approved specifications will
       result in delivery delays
     - Omnicare Clinical Research will provide training and documentation for
       the investigators' meetings with related travel costs passed through
       to Cubist
     - Omnicare Clinical Research Help Desk support provided 24 hours a day,
       7 days a week, once the system is delivered; Help Desk support is
       Multilingual via AT&T's Language Line(R)

     o Functionality includes: 2 treatment groups, 1 randomization call per
       patient, editing of all non-stratification-related patient data,
       system- and role-based security via protocol code and caller
       identification with passwords, comprehensive standard system fax-back
       reporting on demand
     o If randomization is required prior to system completion and validation,
       Cubist will a for a manual randomization service at an additional price
- ---------------------------------------------------------------------------------------------------------------
C. CLINICAL TRIAL MANAGEMENT
- ---------------------------------------------------------------------------------------------------------------
 1. Clinical, monitoring                                                                                 X
    o Onmicare Clinical Research estimates [ ]* North America qualification
      visits and [ ]* International one-day qualification visits ([   ]*
      visits total)
    o Omnicare Clinical Research estimates performance of [  ]* North
      America and [ ]* International initiation visits ([   ]* visits total)
    o Omnicare Clinical Research estimates performance of [  ]* North America
      and [ ]* International interim visits ([ ]* visits total)
    o Omnicare Clinical Research estimates [ ]* North America and [ ]*
      International close-out visits ([ ]* visits total)
- ---------------------------------------------------------------------------------------------------------------
 2. Clinical grant payment administration                                                                X
    o [  ]* payments per site in North America
    o [  ]* payments per site in International
- ---------------------------------------------------------------------------------------------------------------
</TABLE>

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
                                 TASK                                               CUBIST            OMNICARE
                                                                                                      CLINICAL
                                                                                                      RESEARCH
- ---------------------------------------------------------------------------------------------------------------
<S>                                                                                <C>                <C>
 3. CRF tracking, filing and archiving                                                                   X
    o [  ]* pages - North America; [  ]* pages - International; [ ]*
      pages - received from CROs designated by Cubist*
    o [     ]* pages total
    * Omnicare Clinical Research shall not be responsible for any delays or
      interruption in performance of the services due, in any way, to the
      provision of data or other information to be supplied by such other
      CRO designated by Cubist.
- ---------------------------------------------------------------------------------------------------------------
 4. Medical monitoring                                                                                   X
    o [       ]* months in North America
    o [       ]* months in International
    o 24 hour coverage North America/International
- ---------------------------------------------------------------------------------------------------------------
 5. Safety review of CRFs                                                                                X
    o Based on [   ]* cases reviewed
- ---------------------------------------------------------------------------------------------------------------

</TABLE>

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
                                 TASK                                               CUBIST            OMNICARE
                                                                                                      CLINICAL
                                                                                                      RESEARCH
- ---------------------------------------------------------------------------------------------------------------
<S>                                                                                <C>                <C>
 6. SAE Reporting with Initial Descriptive Summaries v o [ ]* total ([ ]*                                X
    in North America/[ ]* in International) o IND Safety Report
    distribution in countries in which CTX/CTA is held by Omnicare
    Clinical Research o Cubist to be billed for actual SAEs reported

- ---------------------------------------------------------------------------------------------------------------
D. CLINICAL DATA MANAGEMENT
- ---------------------------------------------------------------------------------------------------------------
 1. Project database creation and data entry.  Fee based on:                                             X
    o [    ]* CRF pages from North America
    o [    ]* CRF pages from International
    o [    ]* CRF pages received from other CROs designated by Cubist
    o [    ]* total CRF pages
    * Omnicare Clinical Research shall not be responsible for any delays or
      interruption in performance of the services due, in any way, to the
      provision of data or other information to be supplied by such other CRO
      designated by Cubist
- ---------------------------------------------------------------------------------------------------------------
 2. Case report from review and query resolution.  Fee based on:                                         X
    o [     ]* CRF pages from North America
    o [     ]* CRF pages from International
    o [     ]* CRF pages received from other CROs designated by Cubist
    o [     ]* total CRF pages
    * Omnicare Clinical Research shall not be responsible for any delays or
      interruption in performance of the services due, in any way, to the
      provision of data or other information to be supplied by such other CRO
      designated by Cubist
- ---------------------------------------------------------------------------------------------------------------
 3. Dictionary processing of CRFs                                                                        X
    o MedDRA for adverse events, and concurrent surgical procedures
    o WHO-DRUG for medications
- ---------------------------------------------------------------------------------------------------------------
 4. Laboratory data processing (fee assumes previously used central lab)               X                 X
- ---------------------------------------------------------------------------------------------------------------
 5. Reconciliation of Safety/Clinical Databases                                                          X
- ---------------------------------------------------------------------------------------------------------------
 6. Data transfers (standard)                                                                            X
    o 3 interim transfers
- ---------------------------------------------------------------------------------------------------------------
 7. Data security procedures                                                                             X
- ---------------------------------------------------------------------------------------------------------------
 8. DCR Status Reports by site
- ---------------------------------------------------------------------------------------------------------------
E. BIOMETRIC ANALYSIS
- ---------------------------------------------------------------------------------------------------------------
 1. Statistical analysis plan                                                                            X
    o Includes one major one minor revision
- ---------------------------------------------------------------------------------------------------------------
 2. Project data setup and programming of displays                                                       X
    o [    ]* tables, listings, and figures ([  ]* unique and [  ]* repeat)
    o Due to efficiencies, Cubist to be billed for [   ]* unique and [   ]*
      repeat tables, listings, and figures
    o Additional tables, listings, and figures will be billed at the per task
      cost, as outlined in the budget
- ---------------------------------------------------------------------------------------------------------------
</TABLE>

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
                                 TASK                                               CUBIST            OMNICARE
                                                                                                      CLINICAL
                                                                                                      RESEARCH
- ---------------------------------------------------------------------------------------------------------------
<S>                                                                                <C>                <C>
 3. Quality control procedures for displays                                                              X
- ---------------------------------------------------------------------------------------------------------------
 4. Patient evaluability and outcome assessment                                                          X
- ---------------------------------------------------------------------------------------------------------------
 5. Final statistical analysis                                                                           X
- ---------------------------------------------------------------------------------------------------------------
 6. Statistical support for Item 11 preparation                                                          X
- ---------------------------------------------------------------------------------------------------------------
 7. Final data transfer                                                                                  X
- ---------------------------------------------------------------------------------------------------------------
F. CLINICAL WRITING
- ---------------------------------------------------------------------------------------------------------------
 1. Phase III clinical study report                                                                      X
    o One major (up to [    ]*) and one minor (up to [    ]*) revision and up
      to [   ]* brief patient narratives
    o Fee does not include collation or compilation of appendices
- ---------------------------------------------------------------------------------------------------------------
</TABLE>

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>

III. PROJECT TIMELINE

The parties acknowledge that Omnicare Clinical Research commenced performance of
the services on or about [ ]*. The projected timeline for this Project is as
follows:

                            [       ]*

                     (REST OF PAGE INTENTIONALLY LEFT BLANK)

*Confidential treatment requested: Material has been omitted and filed with
the Commission.


<PAGE>

IV. OMNICARE CLINICAL RESEARCH SERVICES

A.  STUDY MANAGEMENT

    1. GLOBAL PROGRAM DIRECTOR/INTERNATIONAL PROJECT MANAGER

Omnicare Clinical Research's Global Program Director will coordinate the
services being provided by all of the disciplines within Omnicare Clinical
Research and will act as a single point of contact for Cubist until completion
of the Project. The International Project Manager, working in conjunction with
the Global Program Director, will manage the international segment of the
Project.

Key responsibilities of these individuals w