PROCEPT INC
10-K, 1997-03-31
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 10-K


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

        For the fiscal year ended December 31, 1996

___     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:  0-21134

                                  Procept, Inc.
             (Exact name of registrant as specified in its charter)

                     Delaware                               04-2893483
         (State or other jurisdiction of                 (I.R.S.  Employer
         incorporation or organization)                  Identification No.)


840 Memorial Drive, Cambridge, Massachusetts                  02139
- --------------------------------------------                  -----
     (Address of principal executive offices)                (zip code)


Registrant's telephone number, including area code:  (617) 491-1100

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 and 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-K 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 of this
Form 10-K.   [X] 

   
The aggregate market value of the voting stock held by non-affiliates of the 
registrant as of March 24, 1996 was $13,222,987.
    

The number of shares of the registrant's common stock outstanding as of March 
24, 1997 was 13,771,868

                      Documents incorporated by reference:
             Portions of the Definitive Proxy Statement to be filed
             with the Securities and Exchange Commission relative to
 the 1997 Annual Meeting of Stockholders are incorporated by reference into 
                            Part III of this report.


<PAGE>




                                     PART I


ITEM 1.  BUSINESS.


CORPORATE SUMMARY

Procept, Inc. ("Procept" or the "Company") is a biopharmaceutical company
engaged in the discovery and development of novel drugs for the treatment or
prevention of: (i) autoimmune diseases and organ transplant rejection and (ii)
infectious diseases, particularly AIDS and tuberculosis. The Company is
currently pursuing five principal research and product development programs in
these areas.

The Company's lead product candidate, PRO 2000, is currently being evaluated in
Phase I human clinical trials as a vaginal topical microbicide to prevent
transmission of HIV-1 and other sexually transmitted disease ("STD") pathogens.
Topical microbicides are designed to provide a chemical barrier to infection and
their development is now a high priority of the U.S. Government and
international agencies. As currently scheduled, Phase I clinical trials in
Antwerp, Belgium and in London, U.K. will be completed during the first half of
1997.

In addition to its PRO 2000 clinical development program, Procept is pursuing
four research programs that leverage the Company's expertise in T cell biology.
With respect to its three immunosuppression programs, Procept targets the CD4
receptor, the CD2 receptor and an intracellular T cell enzyme. In the area of
infectious disease, the Company is investigating the CD1 receptor system and its
role in tuberculosis.

Procept was founded on the basis of its knowledge in areas of cellular
immunology tied to a powerful platform technology centered on nuclear magnetic
resonance ("NMR") spectroscopy. Its immunology expertise derives from the
laboratories of scientists at Harvard who were the first to characterize the CD2
receptor on T cells and to fully characterize both the MHC-recognition domain
and the viral binding domain of the CD4 receptor borne by T cells. In the area
of immunosuppression, Procept continues to identify important new drug targets
involving the immune system. Procept also has accomplished, well-trained
personnel and outstanding laboratory facilities, including powerful NMR
equipment. These assets are now being leveraged by melding NMR with drug
screening technology, providing the Company with the potential of designing
compounds with the efficacy of large molecules but with the delivery advantage
of small molecules.

                                       1
<PAGE>

PROCEPT'S TECHNOLOGY AND DRUG DEVELOPMENT STRATEGY

The Company's approach to drug development is to (i) identify T cell drug
targets that are important in the regulation of the immune system, (ii) clone
express and purify these drug targets, (iii) determine the three-dimensional
structures and active sites of these proteins using x-ray crystallography and
NMR spectroscopy, (iv) employ proprietary high-throughput molecular, cellular,
and NMR-based screening assays to identify potential lead compounds and (v)
optimize lead compounds using medicinal chemistry as well as structure-based
design techniques.

[typeset representation of flow chart]

                                     T-cell
                                    Biology
                                       |
                                       |
                                       |
                                       |
       ----------------------------------------------------------
           |              |                      |              |
           |              |                      |              |
Targets    |        Intracellular                |              |
          CD1           Enzyme                  CD2            CD4
           |              |                      |              |
           |              |                      |              |
           |              |                      |       ----------------
           |              |                      |       |              |
           |              |                      |       |              |
           |              |                      |       |              |
          -----------------------------------------------------------------
Tools   Medicinal Chemistry, Screening, Structure Determination, "SAR by NMR"
         -----------------------------------------------------------------
           |              |                      |              |
           |              |                      |              |
           |              |                      |              |
           |              |                      |              |
          \/             \/                     \/              \/
Drugs   Lipid TB             Immunosuppressive               PRO 2000
        Vaccine                                              Antiviral
                                                                |
                                                                |
                                                         --------------
                                                         |            |
                                                         |            |
                                                        \/            \/
                                                   Systemic HIV    Topical STD
                                                     Therapy          Barrier

- --------------------------------------------------------------------------------
      Preclinical Development                           Clinical Trials
- --------------------------------------------------------------------------------

[end chart]

IMMUNE SYSTEM OVERVIEW

The immune system is composed of a complex variety of cells, each with a
specialized function, that contributes to the defense of the body by responding
to infectious agents. This immune response involves a sequence of events,
beginning with the recognition of foreign substances, known as antigens, by
lymphocytes, a type of white blood cell. Antigen-presenting cells are another
type of cell which, through their surface protein, the Major Histocompatibility
Complex ("MHC") or CD1 receptor, non-specifically recognize antigens and present
them to T cells, the "command center" of the immune system. In contrast to
antigen-presenting cells, T cells recognize specific antigens, become activated
and rapidly divide, producing an army of cells to fight foreign invasion.
Activated T cells either engage in the direct killing of infected cells or in
the secretion of lymphokines which recruit other cell types to respond.
Together, T cells and antigen-presenting cells provide the immune system with
the specificity and flexibility to respond to a wide array of infectious agents.


                                       2
<PAGE>



PROCEPT'S DRUG DEVELOPMENT TARGETS

   
Fundamental to research at Procept is a detailed knowledge of the T cell and its
role in the normal function of the immune system. With respect to its
immunosuppressive programs, Procept targets immune cell receptors (including CD2
& CD4) and intracellular T cell enzymes. In its infectious disease programs, the
Company has utilized its knowledge of the CD4 receptor system and has developed
an understanding of the CD1 receptor system.
    

Immune cell receptors are proteins, found on the surface of immune system cells,
that play a role in the antigen recognition process. These receptors perform a
variety of functions including cell-to-cell communication and identification of
foreign antigens. Normally, these functions endow these receptors with the
ability to modulate the body's immune response, and in many cases these
receptors have been shown to play a critical role as biological pathways leading
to initiation of the immune response. When the system does not function
properly, however, or is stimulated inappropriately, a multitude of autoimmune
disorders may result. One of these receptors, CD4, is also known to be the major
portal of entry for HIV, the virus that causes AIDS.

   
Procept's approach to developing drugs to prevent immune system disorders is to
gain an understanding of the role that certain T cell receptors and
intracellular enzymes play in the antigen recognition process. Procept has
focused on two types of receptors that play a key role in this process: CD4 and
CD2. In addition to T cell receptors and enzymes, Procept is studying the CD1
receptor system, which activates T cells by lipid antigen presentation. These
receptors are involved in the very first events of immune system stimulation and
can be used as targets for therapies that would allow physicians to treat the
cause of immune system disorders such as AIDS, rheumatoid arthritis,
insulin-dependent diabetes, multiple sclerosis, lupus, psoriasis and contact
dermatitis, and infectious diseases such as tuberculosis, leprosy and malaria,
not just the symptoms of such disorders and diseases.


PROCEPT'S DRUG DEVELOPMENT TOOLS

SAR by NMR
Since 1990, Procept has been developing the tools that allow it to capitalize on
an exciting new approach to drug discovery, Structure Activity Relationship by
NMR ("SAR by NMR"). To date, it has been difficult to obtain small molecule
inhibitors of protein-protein interactions, including receptors of the
immunoglobulin (Ig) super-family. The potential strength of SAR by NMR lies in
the ability to identify small molecule fragments that bind very weakly to the
protein, followed by enhancement of affinity through site optimization and
linking of adjacent fragments. The successful application of this new approach
to Ig-like receptors such as CD4 and CD2 would be a significant advance in drug
discovery. Procept has acquired the sophisticated instrumentation and staff
necessary for this program, has determined the three-dimensional structure of
important drug targets, and has a growing library of low molecular weight
compounds to screen for drug leads.

Compound Profiling Expertise
Procept currently utilizes a comprehensive battery of in vitro and in vivo
assays designed to identify and improve upon immunosuppressive compounds. These
assays focus on a given compound's ability to inhibit the activation of T cells.
T cell activation serves as the initiating step in specific immune/inflammatory
reactions. In pathological situations, such as autoimmune disease and organ or
bone marrow transplant rejection, unwanted T cell activation can lead to tissue
damage. Procept is able to quickly assess the effectiveness of selected
compounds in in vivo models for conditions of commercial importance, including
arthritis, multiple sclerosis, and organ transplant rejection.
    


                                       3

<PAGE>

PROCEPT'S DRUG DEVELOPMENT PROGRAMS

The Company has five research and development programs in various stages of
development and is developing two drug development platform technologies. The
following chart summarizes the target and status of each of the Company's five
drug development programs.

   
<TABLE>
<CAPTION>
                                                                       Status
                                                                       ------
Program                   Disease Targets                              Discovery | Research | Preclinical | Clinical
- -------                   ---------------                              ---------------------------------------------
<S>                       <C>                                          <C>

PRO 2000 Gel              AIDS                                         ----------------------------------------

CD4                       Autoimmune diseases/transplant rejection     ------------------

CD2                       Autoimmune diseases/transplant rejection     ------------------

T Cell Enzyme             Autoimmune diseases/transplant rejection     ------------------

CD1                       Intracellular infectious diseases            ----------------
</TABLE>
    

IMMUNOSUPPRESSION DRUG DEVELOPMENT PROGRAMS

   
CD4 Receptor Program
Procept believes that molecules that inhibit CD4 receptor function will provide
fundamentally new approaches to immunosuppressive therapy. The CD4 molecule
functions as a "co-receptor" for the antigen-specific T cell receptor, or TCR,
during the immunological activation of T cells. CD4+ T cells play a major role
in the induction of graft rejection and autoimmune disease. Current T
cell-targeted drugs (such as cyclosporine) are potent immunosuppressives, but
suffer from severe side effects unrelated to their T cell activity. Thus, there
is a clear need for new and novel T cell-targeted therapies. The CD4 molecule is
also the receptor which binds the HIV-1 envelope protein gp120, thereby allowing
the infection of CD4-bearing T cells. Procept scientists and their collaborators
were the first to solve the three-dimensional structure of CD4, and have
recently used Procept's NMR capability to derive proprietary structural
information useful in a drug discovery approach.
    

The combination of Procept's structural and bioassay tools make the Company a
leader in CD4-targeted drug discovery. These tools include:

[bullet]    The ability to produce large quantities of recombinant protein
            reagents.

[bullet]    Molecular assays (ELISA type and biophysical type) for detecting and
            quantitating the binding of compounds to CD4, and for characterizing
            their ability to inhibit the interaction of CD4 with its ligands.

[bullet]    Cell-based assays to screen for inhibitors of CD4/class II dependent
            function (e.g. cell-cell adhesion, T cell signaling, T cell
            proliferation). Also, cell based assays to screen for inhibitors of
            CD4-dependent HIV infection.

[bullet]    Proprietary information on the solution NMR structure, and crystal
            structure, of human 2-domain CD4. 

   
[bullet]    Extensive knowledge of sites of interaction of CD4 with both MHC
            class II and HIV gp120, as determined by site directed mutagenesis.
    

[bullet]    The capability to define details of CD4/inhibitor interactions at
            the molecular level by NMR and crystallography.


                                       4

<PAGE>

CD2 Receptor Program
Procept was also the first to determine the three-dimensional structure of human
CD2. CD2 has recently been shown to play key roles in activating the immune
system and in the breaking of immunological anergy or tolerance. As with CD4,
the Company has initiated a drug discovery program using a combination of high
throughput screening and SAR by NMR to identify small molecules that inhibit CD2
function and thereby promote selective immunosuppression. Procept has an
extremely strong drug discovery "tool kit" for CD2, including proprietary
structural knowledge, robust receptor-based molecular drug screens and
scientific depth in T cell immunology, making it a leader in targeting drugs to
this receptor. Such molecules are expected to be effective in preventing graft
rejection and treating autoimmune disease.

Procept has achieved significant milestones in the area of CD2-targeted drug
discovery. These achievements include:

   
[bullet]    The production of large quantities of recombinant protein reagents,
            including glycosylated soluble CD2 receptor, CD58 receptor and
            chimeric proteins.

[bullet]    Development of a novel and robust ELISA-type molecular assay to
            screen directly for inhibitors of the CD2/CD58 interaction. This
            assay is capable of high-throughput, and accurately mimics the
            targeted in vivo interaction.

[bullet]    Establishment of cell lines and a panel of cellular screening assays
            to assist in the characterization of lead molecules - certain of
            these functional assays may also be suitable for use in
            high-throughput screening.

[bullet]    Development of hybridomas and tools for the production of monoclonal
            antibodies with the appropriate biological properties.

[bullet]    Determination of the proprietary 3D structure and active site data
            for human CD2, and the capability to define details of CD2/inhibitor
            interactions at the molecular level by (750 MHz) NMR.

[bullet]    Murine models to investigate the ability of CD2 inhibitors to
            perturb immune cell function in vivo, to profile analogs, and to
            evaluate pharmacological properties.
    


New T cell target:  Intracellular Enzyme
Procept has initiated work on a new therapeutic target that takes advantage of
the Company's extensive experience in T cell biology. Rather than targeting a T
cell surface receptor, the new program focuses on an intracellular enzyme. This
enzyme is now known to be critical for T cell division (expansion of "angry" T
cell populations), making it a good target for intervention in transplantation
and autoimmune disease. Procept has cloned and expressed the human enzyme. A
screening system which uses the recombinant enzyme is in place, and first
generation inhibitors have been identified.


   
INFECTIOUS DISEASE DRUG DEVELOPMENT PROGRAMS

PRO 2000 Topical Microbicide
By being the first to determine the three-dimensional structure of human CD4,
Procept's scientists laid the groundwork for a proprietary drug discovery
program to identify small molecules that inhibit the binding of HIV-1 to CD4.
Preclinical studies demonstrate that the Company's lead compound, PRO 2000,
binds with high affinity (~20 nM) to the binding domain on CD4 for HIV without
any measurable side-effect on immunological function.
    


                                       5

<PAGE>

PRO 2000, as a topically administered gel, is currently under development as a
female-controlled broad spectrum preventative for sexually transmitted diseases,
including HIV. Worldwide, approximately 70% of HIV transmission occurs through
heterosexual intercourse. Condoms can provide an effective barrier, but are not
used consistently due to their inconvenience and control by the male partner.
Procept has developed a topical formulation of PRO 2000 that is in Phase I
clinical testing as a vaginal gel. Preclinical studies demonstrate that PRO 2000
is a more effective anti-HIV agent than nonoxynol-9. In addition, in vitro
preclinical studies have demonstrated that PRO 2000 is potent against other
sexually transmitted agents such as herpes simplex type 1, herpes simplex type 2
and cytomegalovirus. Activity against other STDs is currently under evaluation.

   
Phase I clinical trials to assess vaginal irritation in healthy female
volunteers began in January, 1997 in Antwerp, Belgium (Institute of Tropical
Medicine) and London, U.K. (St. Mary's Hospital). If the gels are well
tolerated, Procept plans to conduct a series of Phase I/II studies to assess
safety in diverse populations, including groups at high risk for STD infection.
This would be followed by a Phase III trial to evaluate efficacy. Discussions
are underway with the National Institutes of Health and the British Medical
Research Council ("MRC") to secure support for the clinical program.
    

The Company's intentions with respect to the further development of PRO 2000 Gel
are forward looking statements, based on current management expectations.
Factors that could cause such expectations to change, resulting in the delay or
cancellation of the PRO 2000 research program and related preclinical and
clinical studies include the following: the availability of financing for the
Company's continued research operations; technical risks associated with the
development of PRO 2000; changes in regulatory requirements; anticipated market
acceptance of such new drug; and competitive factors and pricing pressures.

PRO 2000 Systemic Study
In September 1996, the Company began a Phase I/II study in Brussels, Belgium to
evaluate PRO 2000 as an injectable drug to treat HIV positive patients. In this
study, eight patients were administered drug intravenously. Although no
side-effects were observed, the Company has decided to postpone, indefinitely,
the development of this formulation and to concentrate all of its efforts on the
clinical development of PRO 2000 as a topical microbicide. This decision was
made based on several factors, including: 1) the rapid progress to date in the
development of PRO 2000 as a topical microbicide, 2) the ability to clearly
differentiate PRO 2000 gel as a leading drug candidate, 3) the rapidly changing
competitive environment for systemic drugs to treat AIDS, and 4) a mandate to
focus its efforts on its highest priority drug discovery programs.

   
CD1 Receptor
In January 1996, Procept entered into a sponsored research agreement with
VacTex, Inc. ("VacTex") to develop novel vaccines based on the CD1 antigen
presentation system. The program, conducted in conjunction with Dr. Michael
Brenner at Brigham & Women's Hospital and Harvard Medical School, focuses on a
novel receptor system for presentation of lipid antigens from infectious disease
pathogens. This CD1 receptor system is thought to be critical in mediating the
immune response to Tuberculosis bacteria ("TB") and other related bacteria. 
TB kills more people than any other infectious agent. Over a third of the 
world's population is infected with this bacterium. There is now no cure
for some multidrug resistant TB strains, and the current vaccine has been
ineffective in stopping the epidemic. VacTex is funding vaccine studies in in
vivo models involving presentation of lipids by the novel CD1 system.
    


                                       6
<PAGE>



Procept and VacTex have put in place a strong CD1 receptor/TB vaccine research
program:

[bullet]    Studies are underway to determine which lipids would be the most
            useful vaccine antigens, and to further clarify exactly how lipid
            antigens stimulate T cells through via CD1 receptor.

[bullet]    Vaccine studies in an in vivo model of TB are underway. These employ
            CD1-presented lipids isolated from TB bacterial cell walls as the
            primary antigen.

[bullet]    Data from these studies will eventually be used to extend the CD1
            receptor approach to other parasitic disease such as malaria, and to
            autoimmune diseases such as multiple sclerosis which appears to have
            a CD1 antigen presentation component.


DRUG DISCOVERY TOOLS

SAR by NMR

Recently, Procept scientists, in collaboration with the laboratory of Gerhard
Wagner of Harvard University, solved the three-dimensional structure of
w-terminal 2-domain CD4. This structure encompasses the binding regions of CD4
to MHC Class II and to the gp120 domain of HIV. The extensive set of CD4
resonance assignments obtained from this work will allow application of the new
SAR by NMR approach to the discovery of novel drug leads. To date, it has been
difficult to obtain small molecule inhibitors of protein-protein interactions,
including receptors of the immunoglobulin (Ig) super-family. The potential
strength of SAR by NMR lies in the ability to identify small molecule fragments
that bind very weakly to the protein (mM affinity), followed by enhancement of
affinity through site optimization and linking of adjacent fragments. The
successful application of this new approach to Ig-like receptors such as CD4
would be a major advance in drug discovery.

Procept scientists, in collaboration with the laboratory of Ellis Reinherz of
the Dana-Farber Cancer Institute, have also determined essential binding sites
on CD4 (for MHC II and gp120) using site-directed mutagenesis. This information
will help to establish the functional significance of small molecule binding
sites on CD4 which have been identified using SAR by NMR.

Because of the biological/clinical importance of CD4 and CD2, and because of the
significant "tool kits" the Company has developed, Procept believes that CD2 and
CD4 are excellent targets for the SAR by NMR approach. Moreover, success with
these targets could lead to an important new platform technology with far
broader application to new drug discovery.


IMMUNOSUPPRESSIVE COMPOUND PROFILING EXPERTISE AT PROCEPT

Rationale and Approach
Procept currently utilizes a comprehensive battery of in vitro and in vivo
assays designed to identify and improve upon immunosuppressive compounds. These
assays focus on a given compound's ability to inhibit the activation of T cells.
T cell activation serves as the initiating step in specific immune/inflammatory
reactions. In pathological situations, such as autoimmune disease and organ or
bone marrow transplant rejection, unwanted T cell activation can lead to tissue
damage. Taking advantage of a broad array of in-house assays, Procept is
developing low molecular weight molecules which are capable of inhibiting T cell
activation. In addition, these assays have been and will continue to be used to
test the biological activities of compounds identified in cell-free molecular
screens such as the CD2/CD58 ELISA, or SAR by NMR.


                                       7
<PAGE>



   
Additional Profiling Tools
Procept has in place the expertise and experimental systems to analyze the
effects of a given compound on T cell cytokine production, cytokine receptor
expression, cytokine/receptor interactions, cell cycle status, anergy/tolerance
induction, and protein kinase activity. These in vitro assays of T cell
activation are useful in optimization of an immunosuppressive compound's
activity profile. Procept also has in place the expertise to evaluate oral
bioavailability and pharmacokinetic parameters.
    


MARKET OPPORTUNITY

Procept's scientists believe that gaining control over the activity of T cells
will permit control of the disease progression at its initiation, long before
the cascade of lymphokines and massive proliferation of T cells. Procept is
exploiting its knowledge of the functions of the immune system and the role of
receptors on the surface of immune system cells to design therapeutic drugs
based on molecules targeted for AIDS and other viral diseases, autoimmune
diseases such as rheumatoid arthritis and insulin-dependent diabetes and organ
and bone marrow transplant rejection. The drugs currently on the market for
these diseases in general provide only symptomatic relief and have significant
limitations, including adverse side effects or limited efficacy. The following
chart summarizes the estimated patient populations for certain medical
conditions. There can be no assurance that the market size estimates for the
indications the Company hopes to address with its products under research will
reflect the actual market size at the time the Company's products, if any, are
being marketed.
                                                      U.S. Patient Population
                                                      -----------------------

         HIV..........................................       900,000
         Autoimmune Disease
              Rheumatoid Arthritis....................     2,000,000
              Insulin-Dependent Diabetes..............       700,000
              SLE (Lupus).............................     1,400,000
              Psoriasis...............................     1,000,000
         Transplant Rejection.........................        18,000

AIDS
AIDS is an infectious disease caused by HIV infection and leads to severe,
life-threatening impairment of the immune system. HIV causes immunosuppression
by attacking and destroying T cells, which coordinate much of the network of
normal immune responses. HIV infection usually leads to AIDS, although
progression to symptomatic disease may take many years.

The Centers for Disease Control recently estimated that there are approximately
200,000 individuals with AIDS in the United States. Up to 900,000 people in the
United States are estimated to be infected by HIV.


Autoimmune Disease
Autoimmune disease is caused by an overactive immune system, in which the body's
defense system mistakenly identifies "self" as "foreign" and mounts a
destructive attack against its own tissues. The most wide-spread chronic
autoimmune disease is rheumatoid arthritis, in which the immune system attacks
the joint tissue resulting in destruction of the body's joints, anatomical
changes in the hands and feet, joint swelling and chronic pain. Other autoimmune
diseases include insulin-dependent diabetes, in which the immune system attacks
the specialized pancreas cells (beta cells) that produce insulin, systemic lupus
erythematosus ("lupus") in which the immune system attacks the skin, joints,
kidneys and other organs of the body, and psoriasis in which the immune 


                                       8

<PAGE>

system attacks skin and other tissues. Rheumatoid arthritis is estimated to
affect more than 2.0 million people in the United States. Insulin-dependent
diabetes is estimated to afflict approximately 700,000 people in the United
States who require daily insulin injections. Lupus is estimated to affect
approximately 1.4 million people in the United States. Approximately 5.0 million
people in the United States suffer from psoriasis with about 1.0 million
moderate-to-severe cases. Current treatments for autoimmune diseases focus on
the alleviation of the symptoms of these diseases but do not affect the disease
initiation and progression.

Transplant Rejection
Transplant rejection results from an immune response involving T cells in which
the immune system recognizes the transplanted organ as "foreign". Bone marrow
and organ transplants, skin grafts and related procedures are now limited by the
lack of availability of drugs that specifically suppress the part of the immune
system involved in transplant rejection. Rejection episodes occur in a majority
of the approximately 18,000 organ transplants performed annually in the U.S.
Current immunosuppressive drugs including azothiaprine, cyclosporine and
steroids, although widely used, may have serious side effects, including severe
toxicity to the patient and the transplanted organ.


STRATEGIC CORPORATE ALLIANCES

Strategy

A combination of large pharmaceutical partners and capital markets has provided
the financial support for Procept's research and development projects. The
Company's goal is to share the risk of product development while maintaining the
prospect of substantial rewards for our investors and partners. Procept has
collaborated with Sandoz, Bristol-Myers Squibb, and The Upjohn Company under
various sponsored research programs resulting in approximately $25 million in
cash payments to the Company. Procept continues to target the development of
research and product development partnerships with large pharmaceutical
companies as a high priority.

The Company has active discussions with several pharmaceutical companies
regarding potential collaborations. If agreements are successfully negotiated,
the Company would expect to receive ongoing research support combined with
up-front fees and milestone payments, in addition to royalties.


SANDOZ

In 1993, Procept and Sandoz entered into an agreement that provided for the two
companies to conduct a research program to screen Sandoz' library for compounds
that would bind to CD4 or CD2 and be useful as therapeutic agents for immune
suppression. In addition, both companies would collaborate in the development of
structure-based drug design techniques that could be used to identify potential
lead compounds and to optimize these leads into drug candidates.

Under the Sandoz Agreement, Procept received $14.2 million in license fees and
research payments. In September 1996, the companies completed their obligations
and the collaboration terminated as scheduled. During the collaboration, both
companies successfully developed a highly refined knowledge of the three
dimensional structure of CD2 and CD4 via NMR and a new arsenal of computer-aided
drug design tools that will be useful generally for lead discovery and
optimization. In addition, the companies developed an extensive panel of immune
cell and receptor-based assays for the screening of compounds that can be used
to regulate the immune system.


                                       9

<PAGE>

VACTEX, INC.

In January 1996, Procept entered into a Sponsored Research Agreement with
VacTex, Inc., an entity created by a group of executives and scientists from
leading biotechnology companies and academic institutions to provide research
services relating to the development of novel vaccines based on discoveries
licensed from the Brigham and Women's Hospital and Harvard Medical School. These
discoveries shed light on a previously unknown aspect of immunology, the CD1
system of lipid antigen presentation.

The initial research of the Company and VacTex focuses on developing novel
vaccine products to address tuberculosis, a disease that causes nearly three
million deaths each year worldwide. The Company believes that discoveries in
connection with this research may in the future become a material part of
Procept's research program.

Under the Sponsored Research Agreement, Procept will conduct specified research
tasks on behalf of VacTex for which Procept will receive a combination of cash
and equity in VacTex based on the number of full-time equivalent employees of
Procept engaged in the research, but subject to maximum cash and stock limits.
Currently, Procept has neither invested cash in, nor transferred technology to,
VacTex. At any time until the earlier of December 1997 or the termination of the
Sponsored Research Agreement by VacTex, Procept may exercise an option to
purchase all of the outstanding capital stock of VacTex at a fixed price.


LICENSES AND ACADEMIC COOPERATIVE AGREEMENTS

Dana-Farber Cancer Institute

Pursuant to a Research and Licensing Agreement between the Company and the
Dana-Farber Cancer Institute, as amended and restated as of February 19, 1987,
the Company has provided funding to support research being conducted in the
laboratory of Dr. Ellis L. Reinherz. In return for, among other things, future
royalty payments, the Company has obtained exclusive worldwide rights to
discoveries in the field of T cell activation made in Dr. Reinherz's laboratory
during any period in which the Company is providing funding under the Research
and Licensing Agreement and for a period ending six months after such funding is
terminated. Such rights will remain in effect until the last expiration date of
any patents relating to such discoveries. Procept has agreed to use its best
efforts to commercially develop, manufacture and distribute products in this
field throughout the world. In April 1993, the Company extended the funding
arrangement through April 1998.

For over fifteen years, Dr. Reinherz has specialized in the identification of
major proteins found on T cells involved in immune system functions and
diseases. In 1979, Dr. Reinherz was the first to identify and characterize CD4
on the surface of T cells. As Chief, Laboratory of Immunobiology at the
Dana-Farber Cancer Institute, with a group consisting of approximately thirty
professionals holding Ph.D. and M.D. degrees, Dr. Reinherz's laboratory is
conducting leading edge research in the areas of protein chemistry, cell biology
and genetic manipulation. Dr. Reinherz is a Director of the Company and also
serves as Chairman of its Scientific Advisory Board.


                                       10
<PAGE>



Harvard University

   
In March 1992, the Company entered into a research agreement with Dr. Gerhard
Wagner of Harvard University relating to the structural analysis of CD2. Under
the terms of the agreement, Dr. Wagner utilized high-resolution NMR spectroscopy
to solve the three-dimensional structure of the extra cellular polypeptide
regions of human CD2. The Company continues to use the CD2 structural data
obtained under this agreement as part of its CD2 drug development program. In
addition, Dr. Wagner remains a consultant to the Company and is a member of its
Scientific Advisory Board.
    

National Institutes of Allergy and Infectious Disease

In July 1992, the Company entered into an agreement with the Division of AIDS of
the National Institutes of Allergy and Infectious Disease under which the
Division of AIDS may screen and test the Company's products as possible
treatments for AIDS and AIDS-related infections. Under the terms of the
agreement, the Division of AIDS will screen and test, at the Division's expense,
products submitted by the Company as anti-viral, anti-bacterial, anti-fungal,
anti-parasitic, immunomodulating or biological modifying agents with potential
for the treatment of AIDS and associated infections.

Medical Research Council

   
In October 1996, the Company and the British Medical Research Council, London,
U.K. entered into an agreement to collaborate in the clinical development of PRO
2000 as a topical microbicide for the prevention of HIV infection. Under the
terms of the agreement, the MRC will evaluate PRO 2000 gel in its program of
Phase I (safety) clinical studies at St. Mary's Hospital, London, under the
direction of Professor J. Weber and Dr. Valerie Kitchen.
    


PATENTS AND PROPRIETARY TECHNOLOGY

The Company's policy is to protect its technology by, among other things, filing
or causing to be filed on its behalf, patent applications for technology
relating to the development of its business. Currently, the Company is awaiting
action on various patent applications relating to technology or the uses or
products thereof which it owns or which it has licensed.

The Company has been issued U.S. patents related to its small molecule
immunosuppressive program and to its AIDS program. The Company has filed patent
applications in the United States relating to (i) compounds and methods for
inhibiting immune response, (ii) compounds (which include PRO 2000) and methods
for inhibiting HIV and (iii) methods for making compounds that inhibit HIV.
Corresponding foreign patent applications have been filed on certain compounds
and will be filed on other compounds, as appropriate.

In addition, the Company has received the exclusive worldwide rights, under the
Research and Licensing Agreement between the Company and the Dana-Farber Cancer
Institute, to discoveries in the fields of T cell activation and selection made
in the Laboratory of Dr. Ellis L. Reinherz at the Dana-Farber Cancer Institute.
Through its purchase option related to VacTex, the Company also has rights to
patents filed relating to the use of CD1 presented antigen technology and the
development of vaccines to prevent tuberculosis and other infectious diseases.

To protect its right to and to maintain the confidentiality of trade secrets and
proprietary information, the Company requires employees, Scientific Advisory
Board members, consultants, and collaborators to execute confidentiality and
invention assignment agreements upon 


                                       11

<PAGE>

   
commencement of a relationship with the Company. These agreements prohibit the
disclosure of confidential information to anyone outside the company and require
disclosure and assignment to the Company of ideas, development, discoveries and
inventions made by employees, consultants, advisors and collaborators.
    

The Company's ability to compete effectively with other companies will depend,
in part, on the ability of the Company to maintain the proprietary nature of its
technology. Although the Company has been granted, has filed applications for
and has been licensed under a number of patents in the United States and foreign
countries, there can be no assurance as to the degree of protection offered by
these patents, as to the likelihood that pending patents will be issued or as to
the validity or enforceability of any issued patents.

Competitors in both the United States and foreign countries, many of which have
substantially greater resources and have made substantial investments in
competing technologies, may have applied for or obtained, or may in the future
apply for and obtain, patents that will prevent, limit or interfere with the
Company's ability to make and sell its products. There can be no assurance that
other third parties will not assert infringement claims against the Company or
that such claims will not be successful. There can also be no assurance that
competitors will not infringe the Company's patents. Further, with respect to
licensed patents, which, in the case of the Company, represent a significant
portion of the Company's proprietary technology, the defense and prosecution of
patent suits may not be in the Company's control.

The Company also relies on unpatented proprietary technology which is
significant to the development of the Company's technology, and there can be no
assurance that others may not independently develop the same or similar
technology or otherwise obtain access to the Company's unpatented technology. If
the Company is unable to maintain the proprietary nature of its technology, the
Company could be adversely affected.


GOVERNMENT REGULATION

Regulations imposed by U.S. federal, state and local authorities, as well as
their counterparts in other countries, are a significant factor in the conduct
of the research, development, manufacturing and marketing activities for the
Company's proposed products.

   
Before testing of any compounds with potential therapeutic value in human test
subjects may begin, stringent government requirements for pre-clinical data must
be satisfied. These data, obtained both from in vivo and in vitro studies, are
submitted in an Investigational New Drug Application or its equivalent in
countries outside the U.S. where clinical studies are to be conducted. These
pre-clinical data must provide an adequate basis for evaluating both the safety
and the scientific rationale for the initial (Phase I) studies in human
volunteers.
    

Phase I clinical studies are commonly performed in healthy human subjects or,
less commonly, selected patients with the targeted disease or disorder. Their
goal is to establish initial data about tolerance and safety of the drug in
humans. Also, the first data regarding the absorption, distribution, metabolism
and excretion of the drug in humans are established.

In Phase II human clinical studies, preliminary evidence is sought about the
pharmacological effects of the drug and the desired therapeutic efficacy in
limited studies with small numbers of carefully selected patients. Efforts are
made to evaluate the effects of various dosages and to establish an optimal
dosage level and dosage schedule. Additional safety data are also gathered from
these studies.


                                       12

<PAGE>


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
dosage regimen. These studies may include investigation of the effects in
subpopulations of patients, such as the elderly.

   
At the same time that the human clinical program is being performed, additional
non-clinical in vivo studies are also conducted. Expensive, long duration
toxicity and carcinogenicity studies are done to demonstrate the safety of drug
administration for the extended period of time required for effective therapy.
Also, a variety of laboratory, and initial human studies are performed to
establish manufacturing methods for delivering the drug, as well as stable,
effective dosage forms.
    

All data obtained from a comprehensive development program are submitted in a
New Drug Application ("NDA") or Product License Application ("PLA") to the FDA
and the corresponding agencies in other countries for review and approval.
Although the FDA policy is to review priority applications 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 proposed product of the Company likely would be
subject to demanding and time-consuming NDA or PLA 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 addition to the regulations relating specifically to product approval, the
activities of the Company, its partners and licensees are subject to laws and
regulations regarding laboratory and manufacturing working conditions, handling
and disposition of potentially hazardous material, and use of laboratory
animals. In many markets, effective commercialization also requires inclusion of
the product in national, state, provincial or institutional formularies or cost
reimbursement systems.

Completing the multitude of steps necessary before marketing can begin requires
the expenditure of considerable resources and can consume a long period of time.
Delay or failure in obtaining the required approvals, clearances, permits or
inclusions by the Company, its collaborators or its licensees would have an
adverse effect on the ability of the Company to generate sales or royalty
revenue. In addition, the impact of new or changed laws or regulations cannot be
predicted.


COMPETITION

The biotechnology and pharmaceutical industries are subject to rapid and
significant technological change. Competitors of the Company in the United
States and abroad are numerous and include, among others, major pharmaceutical
and chemical companies, specialized biotechnology firms and universities and
other research institutions. Competition may increase further as a result of
potential advances in the commercial application of biotechnology and greater
availability of capital for investment in these fields. Acquisitions of
competing companies and potential competitors by large pharmaceutical companies
or others could enhance financial, marketing and other resources available to
such competitors. As a result of academic and government institutions becoming
increasingly aware of the commercial value of their research findings, such
institutions are more likely to enter into exclusive licensing agreements with
commercial enterprises, including competitors of the Company, to market
commercial products. There can be no assurance that the Company's competitors
will not succeed in developing technologies and products that are more effective
than any which are being developed by the Company or which would render the


                                       13

<PAGE>

Company's technology obsolete and noncompetitive, or that such competitors will
not succeed in obtaining FDA or other regulatory approvals for products more
rapidly than the Company.


MANUFACTURING

The Company has no manufacturing facilities and plans to rely upon outside
manufacturers to produce any near term products. The Company believes that there
is currently substantial capacity worldwide for the production of its
anticipated products and that the Company will be able to establish
manufacturing arrangements on acceptable terms.


HUMAN RESOURCES

As of December 31, 1996, the Company had 38 full-time employees, 32 of whom were
engaged in research and development and six in management, administration and
finance. Doctorates are held by 17 of the Company's employees. Each of the
Company's employees has signed an agreement which prohibits the disclosure of
confidential information to anyone outside the Company and requires disclosure
and assignment to the Company of ideas, developments, discoveries and inventions
made by the employee.

The Company's employees are not covered by a collective bargaining agreement.
The Company has never experienced employment-related work stoppage and considers
its employee relations to be excellent.


                                       14
<PAGE>



ITEM 1A. EXECUTIVE OFFICERS OF THE REGISTRANT.

   
The current Executive Officers of the Company are as follows:
    

Stanley C. Erck              48     President; Chief Executive Officer; Director

James C. Jenson, Ph.D.       49     Vice President, Research and Preclinical 
                                    Development; Chief Scientific Officer

Michael J. Higgins           34     Vice President, Finance; Chief Financial 
                                    Officer


The term of office of each officer extends until the meeting of the Board of
Directors following the next annual meeting of Stockholders and until his
successor is elected and qualified or until his earlier resignation or removal.

STANLEY C. ERCK has served as President, Chief Executive Officer and a member of
the Board of Directors of Procept since joining the Company in December 1988.
From 1983 to 1988, Mr. Erck was Vice President, Corporate Development, of
Integrated Genetics, Inc., a publicly-held biotechnology company developing
therapeutic and diagnostic products. Mr. Erck holds an M.B.A. from the
University of Chicago.

JAMES C. JENSON, Ph.D., has served as Vice President, Research since February
1992. From 1986 to 1991, Dr. Jenson was with Triton Biosciences, Inc., the human
health care subsidiary of Shell Oil Company, focusing on cancer therapeutics, as
Director of Protein Chemistry and Chairman of the Scientific Advisory Board,
and, from 1991, following the acquisition of Triton Biosciences Inc. by Schering
A.G. to February 1992, he was Director of Research Management and Administration
with responsibility for oncology research programs at Berlex Bioscience, a U.S.
subsidiary of Schering A. G. Prior to that, Dr. Jenson headed a molecular
immunology group at Hoffman-La Roche In., a pharmaceutical company. Dr. Jenson
received his Ph.D. from the Cornell University Graduate School of Medical
Sciences in 1981.

MICHAEL J. HIGGINS joined Procept in August 1990 as Director of Finance and
Administration and was elected Chief Financial Officer in January 1993 and Vice
President, Finance, in September 1995. Prior to joining Procept, Mr. Higgins was
employed by the Strategic Planning Group at Sterling Drug Inc. From 1985 to
1988, Mr. Higgins held sales/marketing positions with Schering-Plough
Corporation. Mr. Higgins holds an M.B.A. from the Amos Tuck School of Business
Administration at Dartmouth College.


ITEM 2. PROPERTIES.

The Company's headquarters and research and development facilities are located
in Cambridge, Massachusetts in close proximity to Harvard University and MIT. At
its 840 Memorial Drive location, the Company leases a total of approximately
41,200 square feet of space, which includes approximately 34,800 square feet of
research laboratories. The Company also leases approximately 3,400 square feet
of space at 84 Hamilton Street, which includes approximately 1,100 square feet
of research laboratories. The Company believes such laboratory space will be
adequate for its existing research and drug development activities.


ITEM 3. LEGAL PROCEEDINGS.

The Company is not party to any material legal proceedings.


                                       15

<PAGE>

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

No matters were submitted to a vote of security holders during the fourth
quarter of the fiscal year covered by this report.

                                     PART II

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

Following the Company's February 17, 1994 initial public offering, the Common
Stock has been quoted on the Nasdaq National Market under the symbol "PRCT". The
following table sets forth the range of high and low closing sale prices for the
Common Stock as reported by the Nasdaq National Market for the periods indicated
below.

                            High                    Low
                            ----                    ---
   1996
   Fourth Quarter         $1.406                  $1.031
   Third Quarter           2.375                   1.313
   Second Quarter          3.375                   1.813
   First Quarter           3.250                   2.172

   1995
   Fourth Quarter         $6.375                  $2.125
   Third Quarter           7.750                   5.125
   Second Quarter          6.375                   2.375
   First Quarter           2.813                   2.063

As of December 31, 1996 there were 313 holders of record and approximately 2,600
beneficial holders of the Common Stock. On March 24, 1997 the closing price
reported on the Nasdaq National Market for the Common Stock was $1.03.

   
On May 17, 1996, pursuant to a Private Memorandum and Subscription Agreements
between the Company and investors meeting the definition of "accredited
investor" as set forth in the Securities Exchange Commission Regulation D, the
Company offered and sold 4,738,274 units (the "Units"), each composed of one
shares of Common Stock, $0.01 par value, and a Warrant for one share of Common
Stock, $0.01 par value (the "Warrants"). The Unit price was $2.44375 and
aggregate gross proceeds were $11,579,080. No commissions were paid. The Company
filed a Form D for this offering, claiming an exemption under Rule 506 of
Regulation D.

The Warrants issued in this offering were exercisable beginning November 17,
1996 at an intial exercise price per share of $2.50. The Warrants are suject to
redemption by the Company upon 30 days prior notice to the holders beginning May
17, 1998 at a price of $0.01 per underlying share in the event that the average
closing price of the Company's Common Stock for any 20 consecutive trading day
period exceeds $3.75.
    

Dividend Policy

The Company has never paid cash dividends on the Common Stock and does not
anticipate paying such dividends in the foreseeable future. The Company
currently intends to retain any future earnings for use in the Company's
business. See "Management Discussion and Analysis of Financial Condition and
Results of Operations - Liquidity and Capital Resources."


                                       16
<PAGE>



ITEM 6. SELECTED FINANCIAL DATA.

The selected financial data set forth below as of December 31, 1996 and 1995 and
for each of the three years in the period ended December 31, 1996 are derived
from the Company's financial statements included elsewhere in this Report, which
have been audited by Coopers & Lybrand L.L.P., independent accountants. The
selected financial data set forth below as of December 31, 1994, 1993 and 1992
and for the years ended December 31, 1993 and 1992 are derived from audited
financial statements not included in this Report. This data should be read in
conjunction with the Company's financial statements and related notes thereto
and "Management's Discussion and Analysis of Financial Condition and Results of
Operations" under Item 7 of this report.


                             SELECTED FINANCIAL DATA

<TABLE>
<CAPTION>
                                                           YEARS ENDED DECEMBER 31,
                                                           ------------------------

                                        1996            1995          1994         1993        1992
                                        ----            ----          ----         ----        ----
                                                           (in thousands, except share data)
<S>                                <C>             <C>            <C>            <C>          <C>
Statement of Operations Data:
Revenues                           $      2,278    $     4,647    $     7,571    $   5,798    $  2,960
Costs and expenses:
   Research and development               9,925         12,406         11,559        7,957       5,867
   General and administrative             3,176          3,723          3,805        2,532       2,018
   Restructuring charges                    273           --             --           --          --
   Interest                                 139            230            171          130         103
                                   ------------    -----------    -----------    ---------    --------

   Total costs and expenses              13,513         16,359         15,535       10,619       7,988
                                   ------------    -----------    -----------    ---------    --------

Net loss                                (11,235)       (11,712)        (7,964)      (4,821)     (5,028)
Accretion of discount on
     preferred stock                       --             --               20          160        --
                                   ------------    -----------    -----------    ---------    --------
Net loss to common
     stockholders                  $    (11,235)   $   (11,712)   $    (7,984)   $  (4,981)   $ (5,028)
                                   ============    ===========    ===========    =========    ========

Net loss per common share          $       (.97)   $     (1.82)   $     (1.39)   $  (10.98)   $ (50.94)
                                   ============    ===========    ===========    =========    ========

Weighted average number of
    common and common equivalent
    shares outstanding               11,538,500      6,422,613      5,731,057      453,517      98,713
</TABLE>

<TABLE>
<CAPTION>
                                                     AS OF DECEMBER 31,
                                                     ------------------
                                       1996      1995     1994       1993       1992
                                       ----      ----     ----       ----       ----

                                                                     (in thousands)
<S>                                    <C>      <C>      <C>       <C>         <C>
Balance Sheet Data:
Cash and cash equivalents              $1,962   $  565   $ 7,450   $  2,862    $    151
Marketable securities                   4,002    2,006     9,393       --          --
Total assets                            8,917    6,397    19,704      5,777       2,257
Capital lease obligations net of
  current portion and other
  non-current liabilities                 456      907       860        858         630
Redeemable convertible
  preferred stock                        --       --        --       21,039      10,778
Total stockholders' equity (deficit)    6,316    1,439    12,851    (17,792)    (12,837)
Dividends - None
</TABLE>


                                       17

<PAGE>

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

RESULTS OF OPERATIONS

Since its inception, the Company has generated no revenues from product sales.
The Company is dependent upon research and development collaborations, equity
financing and interest on invested funds to provide the working capital required
to pursue its intended business activities. The Company has not been profitable
since incorporation and has an accumulated deficit of $48,703,200 through
December 31, 1996. Losses have resulted principally from costs incurred in
research and development activities related to the Company's efforts to develop
drug candidates and from the associated administrative costs required to support
those efforts. The Company believes that operating losses will continue over the
next several years and expects these losses will increase as clinical trials
continue. The Company's potential for future profitability is dependent on its
ability to effectively develop pharmaceutical products and obtain regulatory
approvals for such products and obtain adequate financing. Future profitability
will require that the Company establish agreements for product development,
commercialization and sales of its products with corporate sponsors.

Years ended December 31, 1996 and 1995

The Company's 1996 total revenues decreased to $2,278,000 from $4,647,000 for
the same period of 1995, principally as a result of a decrease in research
revenue due to an amendment of the Sandoz Agreement. In 1996, revenues consisted
of $1,275,0000 earned under the Sandoz Agreement, $563,000 earned under the
VacTex Agreement, and $440,000 in earned interest on invested funds. In 1995,
revenues consisted of $3,925,000 earned under the Sandoz Agreement, $29,000
earned under the Bristol-Myers Squibb Agreement, $105,000 in grant revenue and
$588,000 in earned interest on invested funds.

   
The Company's total operating expenses decreased to $13,513,000 in 1996 from
$16,359,000 in 1995. Research and development expenses decreased 20% to
$9,925,000 from $12,406,000 in 1995. This decrease in research and development
expense reflects the restructuring which the Company completed in September
1996. The restructuring resulted in a decrease of 19 research employees. General
and administrative expenses decreased 15% to $3,176,000 from $3,723,000 in 1995.
This decrease of general and administrative expenses reflects management's
efforts to control and reduce discretionary spending and maximize the use of
cost effective resources. In 1996, the Company restructured its operations
resulting in a one-time expense charge of $273,000 consisting of salary and
benefit costs relating to the restructuring. There was no comparable charge in
1995. Interest expense decreased to $139,000 in 1996 from $230,000 in 1995 as a
result of the scheduled completion of many of the Company's capital equipment
leases.
    

Years ended December 31, 1995 and 1994

The Company's 1995 total revenues decreased to $4,647,000 from $7,571,000 for
the same period of 1994, principally as a result of a decrease in research
revenue due to the scheduled completion of the Bristol-Myers Squibb Agreement
and an amendment to the Sandoz Agreement. In 1995, revenues consisted of
$3,925,000 earned under the Sandoz Agreement, $29,000 earned under the
Bristol-Myers Squibb Agreement, $105,000 in grant revenue and $588,000 in earned
interest on invested funds. In 1994, revenues consisted of $5,000,000 earned
under the Sandoz Agreement, $1,702,000 earned under the Bristol-Myers Squibb
Agreement and $870,000 in interest earned on invested funds.


                                       18

<PAGE>

The Company's total operating expenses increased to $16,359,000 in 1995 from
$15,535,000 in 1994. Research and development expenses increased 7% to
$12,406,000 in 1995 from $11,559,000 in 1994. This expense growth was due
primarily to an increase in the Company's clinical trial development
expenditures. General and administrative expenses remained essentially unchanged
during 1995 decreasing to $3,723,000 from $3,805,000 in 1994. This leveling of
general and administrative expenses reflects management's efforts to control
discretionary spending and maximize the use of cost effective in-house
resources. Interest expense increased to $230,000 in 1995 from $170,000 during
1994 as a result of an increase in the utilization of equipment lease financing.

LIQUIDITY AND CAPITAL RESOURCES

Since its inception in 1985, the Company has financed its operations from the
sale of $55,121,000 of its securities, the receipt of $28,677,000 under
collaborative research agreements and $2,530,000 in interest income. At December
31, 1996, the Company's aggregate cash, cash equivalents and marketable
securities were $5,964,000, as compared to $2,571,000 at December 31, 1995. The
$3,393,000 increase in available funds was driven primarily by the Company's
financing activities (a follow-on offering and a private placement of units)
offset by its operating loss.

During the year ended December 31, 1996. The Company's significant uses of cash
included a net loss of $11,236,000, principal payments on capital leases of
$908,000, capital expenditures of $298,000 and financing costs of $856,000.
Offsetting these uses were successful equity financings of $5,283,000 from a
secondary offering and $11,579,000 from a private placement of units.

The Company expects that its current funds, interest income and equipment lease
financing will be sufficient to fund Procept's financial needs into the third
quarter of 1997. Although management continues to pursue additional funding
arrangements, no assurance can be given that such financing will be available to
the Company. If the Company is unable to enter into an additional corporate
collaboration(s) that produce cash flow for the Company, or secure additional
financing, the Company's financial condition will be materially adversely
affected. The Company's working capital and other cash needs will depend heavily
on the success of the Company's clinical trials. Success in early stage clinical
trials would lead to an increase in working capital requirements. The Company's
actual cash requirements may vary materially from those now planned because of
the results of research and development, clinical trials, product testing,
relationships with strategic partners, changes in the focus and direction of the
Company's research and development programs, competitive and technological
advances, the process of obtaining United States Food and Drug Administration or
other regulatory approvals and other factors.

In February 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 128, "Earnings Per Share" (SFAS 128), which
is effective for fiscal years ending after December 15, 1997, including interim
periods. Earlier applications is not permitted. SFAS 128 specifies the
computation, presentation, and disclosure requirements for earnings per share
and is substantially similar to the standard recently issued by the
International Accounting Standards Committee entitled International Accounting
Standards, Earnings Per Share (IAS 33). The Company plans to adopt SFAS 128 in
1997 and has not yet determined the impact.

The Company will need to raise substantial additional funds to support its
operations. The Company intends to seek such additional funding through public
or private financing or collaborative or other arrangements with corporate
partners. If additional funds are raised by issuing equity securities, further
dilution to existing stockholders will result and future investors may be
granted rights superior to those of existing stockholders. Other important
factors which may impact upon the achievement of the Company's strategic goals
and other forward looking statements are set forth in Exhibit 99.1 to this Form
10-K, all of which are incorporated herein by reference.


                                       19
<PAGE>




ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.



                          INDEX TO FINANCIAL STATEMENTS


   
                                                                     Page(s)

Report of Independent Accountants                                       21

Balance Sheets as of December 31, 1996 and 1995                         22

Statements of Operations for the years ended
       December 31, 1996, 1995 and 1994                                 23

Statements of Stockholders' Equity (Deficit) for
       the years ended December 31, 1996, 1995 and 1994                 24

Statements of Cash Flows for the years ended
       December 31, 1996, 1995 and 1994                                 25

Notes to Financial Statements                                          26-39
    

                 Financial statement schedules have been omitted
                since they are not required or are inapplicable.




                                       20
<PAGE>







                        REPORT OF INDEPENDENT ACCOUNTANTS



To the Board of Directors and
Stockholders of Procept, Inc.:

We have audited the accompanying balance sheets of Procept, Inc. as of December
31, 1996 and 1995, and the related statements of operations, stockholders'
equity (deficit) and cash flows for each of the three years in the period ended
December 31, 1996. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. 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, the financial statements referred to above present fairly, in
all material respects, the financial position of Procept, Inc. as of December
31, 1996 and 1995, and the results of its operations and its cash flows for each
of the three years in the period ended December 31, 1996, in conformity with
generally accepted accounting principles.

The accompanying financial statements have been prepared assuming that the
Company will continue as a going concern. As discussed in Note A to the
financial statements, the Company has suffered recurring losses from operations
and requires significant additional financing. These factors raise substantial
doubt about the Company's ability to continue as a going concern. Management's
plans in regard to these matters are also described in Note A. The financial
statements do not include any adjustments that might result from the outcome of
this uncertainty.



                                Coopers & Lybrand L.L.P.

Boston, Massachusetts
February 13, 1997


                                       21
<PAGE>


                                  PROCEPT, INC.

                                 BALANCE SHEETS
                                ----------------
   
<TABLE>
<CAPTION>
                                                                                           December 31
                                                                                           -----------
                       ASSETS                                                       1996                 1995
                                                                                    ----                 ----
<S>                                                                                <C>             <C>
Current assets:
    Cash and cash equivalents                                                      $  1,962,229    $    565,521
    Accounts receivable (Note F)                                                        172,812           8,944
    Marketable securities (Note C)                                                    4,001,625       2,005,670
    Prepaid expenses and other current assets                                           111,237         147,511
                                                                                   ------------    ------------
       Total current assets                                                           6,247,903       2,727,646

Property and equipment, net (Notes D and I)                                           1,863,200       2,815,320
Restricted investment (Notes I and J)                                                   469,000         522,000
Deferred financing charges (Note E)                                                        --           152,773
Other assets (Note B)                                                                   337,163         178,920
                                                                                   ------------    ------------
       Total assets                                                                $  8,917,266    $  6,396,659
                                                                                   ============    ============
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
    Accounts payable                                                               $    773,501    $    888,700
    Accrued compensation                                                                122,712         194,115
    Accrued contract research costs (Note I)                                            438,513         417,353
    Other current liabilities (Note A)                                                  196,610         250,819
    Note payable (Note J)                                                                  --           115,851
    Current portion of capital lease
       obligations (Note I)                                                             614,063         908,432
    Deferred revenue (Note F)                                                              --         1,275,000
                                                                                   ------------    ------------
       Total current liabilities                                                      2,145,399       4,050,270
Capital lease obligations, less current
       portion (Note I)                                                                  20,231         634,294
Other noncurrent liabilities (Note I)                                                   435,529         273,139
Commitments and contingencies (Notes F and I) 
Stockholders' equity (Note E):
    Common stock, $.01 par value; 30,000,000 and 12,000,000 shares authorized at
       December 31, 1996 and 1995 respectively; 13,680,399 and 6,476,062 shares
       issued and outstanding at December 31, 1996 and 1995, respectively               136,804          64,761
    Additional paid-in capital                                                       54,960,583      38,882,654
    Receivable from sale of stock                                                       (73,242)        (42,107)
    Accumulated deficit                                                             (48,703,200)    (37,467,440)
    Unrealized (loss) gain on securities available for sale (Note C)                     (4,838)          1,088
                                                                                   ------------    ------------
         Total stockholders' equity                                                   6,316,107       1,438,956
                                                                                   ------------    ------------
         Total liabilities and stockholders' equity                                $  8,917,266    $  6,396,659
                                                                                   ============    ============
</TABLE>
    

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


                                       22
<PAGE>



                                  PROCEPT, INC.

                            STATEMENTS OF OPERATIONS
                                 --------------

<TABLE>
<CAPTION>
                                                for the years ended December 31,
                                                --------------------------------
                                               1996            1995            1994
                                               ----            ----            ----
<S>                                        <C>             <C>             <C>
Revenues:
   Research and development revenue
     under collaborative agreements
     (Note F)                              $  1,275,000    $  3,925,000    $  5,000,000
   Research and development revenue
     under collaborative agreements
     from related party (Note F)                562,500          28,645       1,701,600
   Revenue from grant                              --           105,264            --
   Interest income                              440,075         587,964         869,525
                                           ------------    ------------    ------------

         Total revenues                       2,277,575       4,646,873       7,571,125
                                           ------------    ------------    ------------

Costs and expenses:
   Research and development
     (Notes F and I)                          9,925,315      12,406,290      11,559,197
   General and administrative                 3,176,136       3,723,014       3,805,241
   Restructuring charges (Note A)               273,324            --              --
   Interest expense                             138,560         229,856         170,433
                                           ------------    ------------    ------------

         Total costs and expenses            13,513,335      16,359,160      15,534,871
                                           ------------    ------------    ------------

Net loss                                    (11,235,760)    (11,712,287)     (7,963,746)

Accretion of discount on preferred stock           --              --            19,938
                                           ------------    ------------    ------------

Net loss to common stockholders            $(11,235,760)   $(11,712,287)   $ (7,983,684)
                                           ============    ============    ============

Net loss per common share                  $       (.97)   $      (1.82)   $      (1.39)
                                           ============    ============    ============

Weighted average number of common
   and common equivalent shares
   outstanding                               11,538,500       6,422,613       5,731,057
                                           ============    ============    ============
</TABLE>





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


                                       23
<PAGE>


                                  Procept, Inc.
                  Statements of Stockholders' Equity (Deficit)
              For the Years Ended December 31, 1996, 1995, and 1994
                                 --------------

<TABLE>
<CAPTION>
                                                 Common Stock         Additional     Receivable 
                                            ----------------------     Paid-in          From
                                            Shares       Par Value     Capital      Sale of Stock
                                            ------       ---------    ---------     -------------
<S>                                         <C>          <C>         <C>            <C>
Balance at December 31, 1993                   443,373   $  4,433           --      $(25,022)
   Accretion of Redeemable
     Convertible Preferred Stock to
     Redemption Value                                                     19,938        --   
   Conversion of Redeemable
     Convertible Preferred Stock
     to Common Stock                         3,477,377     34,774     21,004,342        --   
   Issuance of Common Stock
     From Initial Public Offering (IPO)      2,415,000     24,150     18,588,134        --   
   Purchase of Common Stock
     Warrants                                     --         --              560        --   
   Exercise of Stock Options                    19,850        199         62,308        --   
   Payment of IPO Financing Costs                 --         --         (990,898)       --   
   Unrealized Loss on Securities
     Available for Sale                           --         --             --          --   
   Net Loss                                       --         --             --          --   
                                            ----------   --------   ------------    --------

Balance at December 31, 1994                 6,355,600     63,556     38,684,384     (25,022)
   Employee Stock Purchase Plan                 72,928        730        131,001        --   
   Exercise of Stock Options                    42,524        425         58,519     (23,092)
   Issuance of Stock in Payment
     of Bonus                                    3,400         34          8,466        --   
   Unrealized Gain on Securities for Sale         --         --             --          --   
   Collection on Receivable from
     Sale of Stock                                --         --             --         6,007
   Exercise of Common Stock Warrants             1,610         16            (16)       --   
   Issuance of Common Stock Warrants              --         --              300        --   
   Net Loss                                       --         --             --          --   
                                            ----------   --------   ------------    --------

Balance at December 31, 1995                 6,476,062     64,761     38,882,654     (42,107)
   Employee Stock Purchase Plan                 60,004        599         96,167        --   
   Issuance from Secondary Offering          2,350,000     23,500      5,239,998        --   
   Issuance from Private Placement           4,738,274     47,384     11,531,696        --   
   Payment of Costs of Financings                 --         --         (855,673)       --   
   Exercise of Stock Options                    56,059        560         65,521     (50,150)
   Unrealized Loss on Securities for Sale         --         --             --          --   
   Collection on Receivable from
     Sale of Stock                                --         --             --        19,015
   Issuance of Common Stock Warrants              --         --              220        --   
   Net Loss                                       --         --             --          --   
                                            ----------   --------   ------------    --------
Balance at December 31, 1996                13,680,399   $136,804   $ 54,960,583    $(73,242)
                                            ==========   ========   ============    ========
</TABLE>


<TABLE>
<CAPTION>
                                                                Unrealized
                                                                Gain (Loss)        Total
                                                               on Securities   Stockholders'
                                              Accumulated        Available        Equity
                                              Deficit            For Sale        (Deficit)
                                              -------            --------        ---------
<S>                                         <C>             <C>             <C>
Balance at December 31, 1993                $(17,771,469)           --      $(17,792,058)
   Accretion of Redeemable
     Convertible Preferred Stock to
     Redemption Value                            (19,938)           --
   Conversion of Redeemable
     Convertible Preferred Stock
     to Common Stock                                --        21,039,116
   Issuance of Common Stock
     From Initial Public Offering (IPO)             --        18,612,284
   Purchase of Common Stock
     Warrants                                       --               560
   Exercise of Stock Options                        --            62,507
   Payment of IPO Financing Costs                   --          (990,898)
   Unrealized Loss on Securities
     Available for Sale                             --      $   (116,356)       (116,356)
   Net Loss                                   (7,963,746)           --        (7,963,746)
                                            ------------    ------------    ------------

Balance at December 31, 1994                 (25,755,153)       (116,356)     12,851,409
   Employee Stock Purchase Plan                     --              --           131,731
   Exercise of Stock Options                        --              --            35,852
   Issuance of Stock in Payment
     of Bonus                                       --              --             8,500
   Unrealized Gain on Securities for Sale           --           117,444         117,444
   Collection on Receivable from
     Sale of Stock                                  --              --             6,007
   Exercise of Common Stock Warrants                --              --              --
   Issuance of Common Stock Warrants                --              --               300
   Net Loss                                  (11,712,287)           --       (11,712,287)
                                            ------------    ------------    ------------

Balance at December 31, 1995                 (37,467,440)          1,088       1,438,956
   Employee Stock Purchase Plan                     --              --            96,766
   Issuance from Secondary Offering                 --              --         5,263,498
   Issuance from Private Placement                  --              --        11,579,080
   Payment of Costs of Financings                   --              --          (855,673)
   Exercise of Stock Options                        --              --            15,931
   Unrealized Loss on Securities for Sale           --            (5,926)         (5,926)
   Collection on Receivable from
     Sale of Stock                                  --              --            19,015
   Issuance of Common Stock Warrants                --              --               220
   Net Loss                                  (11,235,760)           --       (11,235,760)
                                            ------------    ------------    ------------
Balance at December 31, 1996                $(48,703,200)   $     (4,838)   $  6,316,107
                                            ============    ============    ============
</TABLE>

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

                                       24

<PAGE>


                                  PROCEPT, INC.
                            STATEMENTS OF CASH FLOWS
                                  -------------

<TABLE>
<CAPTION>
                                                                              for the years ended December 31,
                                                                              --------------------------------

                                                                             1996             1995            1994
                                                                             ----             ----            ----
<S>                                                                       <C>             <C>             <C>
Cash flows from operating activities:
   Net loss                                                               $(11,235,760)   $(11,712,287)   $ (7,963,746)
   Adjustments to reconcile net loss to net cash
       used in operating activities:
     Depreciation and amortization                                           1,234,448         982,637         871,294
     Non-cash related party revenue                                           (150,000)           --              --
     (Gain) loss on sale of equipment                                             --              --           (32,586)
     (Gain) loss on sale/leaseback of equipment                                   --             3,270            --
     (Gain) loss on sale of marketable securities                               (1,359)           --              --
Changes in operating assets and liabilities:
     Accounts receivable                                                      (163,868)         (8,944)           --
     Prepaid expenses and other current assets                                  36,274           8,512          (6,087)
     Other assets                                                               (8,243)         (8,923)         (6,672)
     Accounts payable                                                         (115,199)       (689,365)      1,046,582
     Accrued compensation                                                      (71,403)          1,005          12,523
     Accrued contract research                                                  21,160          71,606         (71,440)
     Other current liabilities                                                 (54,210)         79,061          57,450
     Deferred revenue                                                       (1,275,000)     (1,725,000)      3,000,000
     Other noncurrent liabilities                                              162,390          63,893          53,344
                                                                          ------------    ------------    ------------

         Net cash used in operating activities                             (11,620,770)    (12,934,535)     (3,039,338)
                                                                          ------------    ------------    ------------

Cash flows from investing activities:
     Capital expenditures                                                     (297,888)       (533,855)       (834,616)
     Proceeds from sale/leaseback of equipment                                    --           116,784         440,850
     Proceeds  from sale of equipment                                             --              --            14,550
     Proceeds from sale of marketable securities                             2,004,070       5,485,252            --
     Proceeds from maturity of marketable securities                         3,000,000       2,000,000            --
     Purchase of marketable securities                                      (6,989,032)           --        (9,509,836)
    (Increase) decrease in restricted investment                                53,000         (85,000)        (32,000)
                                                                          ------------    ------------    ------------

         Net cash provided by (used in) investing
           activities                                                       (2,229,850)      6,983,181      (9,921,052)
                                                                          ------------    ------------    ------------

Cash flows from financing activities:
     Proceeds from issuance of common stock from initial
       public offering (IPO)                                                      --              --        18,612,284
     Proceeds from issuance of common stock                                  5,282,514            --              --
     Payment of IPO and common stock financing costs                          (855,673)           --          (990,898)
     Proceeds from exercise of common stock options                             15,931          41,859          62,507
     Proceeds from employee stock purchase plan                                 96,766         131,731            --
     Proceeds from issuance of warrants                                            220             300             560
     Proceeds from private placement of stock                               11,579,080            --              --
     Payment on note payable                                                  (115,851)           --              --
     Proceeds from note payable                                                   --           115,851            --
     Deferred financing charges                                                152,773        (152,773)        402,012
     Principal payments on capital lease obligations                          (908,432)     (1,069,839)       (537,980)
                                                                          ------------    ------------    ------------

         Net cash provided by (used in) financing activities                15,247,328        (932,871)     17,548,485
                                                                          ------------    ------------    ------------

Net change in cash and cash equivalents                                      1,396,708      (6,884,225)      4,588,095
Cash and cash equivalents at beginning of year                                 565,521       7,449,746       2,861,651
                                                                          ------------    ------------    ------------
Cash and cash equivalents at end of year                                  $  1,962,229    $    565,521    $  7,449,746
                                                                          ============    ============    ============
Supplemental disclosure of cash flow information:
   Interest paid                                                          $    146,772    $    222,396    $    171,322
                                                                          ============    ============    ============
Supplemental disclosure of noncash transactions:
   Redeemable convertible preferred stock
     converted to common stock                                                    --              --      $ 21,039,116
                                                                          ============    ============    ============
   Property and equipment acquired under capital leases                           --      $  1,266,772    $    761,810
                                                                          ============    ============    ============
   Accretion of redeemable convertible preferred
     stock to redemption value                                                    --              --      $     19,938
                                                                          ============    ============    ============
   Unrealized (loss) gain on securities
     available for sale                                                   $     (5,926)   $    117,444    $   (116,356)
                                                                          ============    ============    ============
</TABLE>

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


                                       25
<PAGE>


                                  PROCEPT, INC.
                          NOTES TO FINANCIAL STATEMENTS

                                ----------------


A.     Nature of Business:

          Procept, Inc. (the "Company") is engaged in the discovery and
          development of novel, highly specific small molecule therapeutics for
          the prevention and treatment of chronic and life-threatening immune
          system disorders. The Company's research is based upon its
          understanding of critical cell receptors responsible for modulating
          immune responses. The Company is developing therapeutics for the
          treatment of arthritis, diabetes, organ transplant rejection and
          infectious diseases, including AIDS and tuberculosis.

          The Company is subject to risks common to companies in the
          Biotechnology industry including, but not limited to, development by
          the Company or its competitors of new technological innovations,
          dependence on key personnel, protection of proprietary technology,
          compliance with FDA government regulations and the ability to obtain
          financing.

          Plan of Operations

          Since its inception the Company has generated no revenue from product
          sales. The Company has not been profitable since inception and has
          incurred an accumulated deficit of $48,703,200 through December 31,
          1996. Losses have resulted principally from costs incurred in research
          and development activities related to the Company's efforts to develop
          drug candidates and from the associated administrative costs. The
          Company expects to incur significant additional operating losses over
          the next several years and expects cumulative losses to increase
          substantially due to expanded research and development efforts,
          preclinical and clinical testing and development of marketing, sales
          and production capabilities.

   
          Because of its continuing losses from operations, the Company will be
          required to obtain additional funds in the short term to satisfy its
          ongoing capital needs and to continue operations. Although management
          continues to pursue additional funding arrangements and/or strategic
          partnering there can be no assurance that additional funding will be
          available from any of these sources or, if available, will be
          available on acceptable or affordable terms. If the Company is unable
          to obtain financing on acceptable terms, it could be forced to curtail
          or discontinue its operations. The financial statements do not include
          any adjustments that might result from the outcome of this
          uncertainty.
    

          Restructuring

          On September 1, 1996, the Company's management proposed and the
          Company's Board of Directors approved a restructuring plan which was
          effected on September 9, 1996. The restructuring resulted in twenty
          employees of the Company being terminated. The amount of termination
          benefits accrued and charged to restructuring cost in the Statement of
          Operations for the year ended December 31, 1996 was $273,324. Almost
          all of the employees terminated were from the Company's research
          organization. The amount of termination benefits paid and charged
          against the liability for the year ended December 31, 1996 was
          $264,272.


                                       26
<PAGE>


                                  PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------

B.     Summary of Significant Accounting Policies:

          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 Equivalents and Marketable Securities

          The Company considers all short-term investments purchased with an
          original maturity of three months or less at the date of acquisition
          to be cash equivalents, all short-term investments with a scheduled
          maturity date of less than twelve (12) months at the balance sheet
          date are considered to be current marketable securities, and all
          investments purchased with a scheduled maturity date greater than
          twelve (12) months at the balance sheet date are noncurrent marketable
          securities.

          Restricted Investment

          The Company maintains a certificate of deposit with a maturity of
          three months for purposes of collateralizing a letter of credit
          associated with its leased facilities and its corporate credit cards.
          The certificate of deposit is recorded at cost, which approximates
          market. Interest earned on the certificate of deposit is not
          restricted; accordingly, any accrued interest is considered a cash
          equivalent. See also Notes I and J.

          Property and Equipment

          Property and equipment is recorded at cost and depreciated on a
          straight-line basis over the following estimated useful lives:

          Laboratory equipment            5 years
          Furniture and fixtures          5 years
          Office equipment                5 years
          Equipment and furniture         Estimated useful life or
          under capital lease             term of lease, if shorter
          Leasehold improvements          Estimated useful life or
                                          term of lease, if shorter

          Major additions and improvements are capitalized, while repairs and
          maintenance are expensed as incurred. Upon retirement or other
          disposition, the cost and related accumulated depreciation are removed
          from the accounts and the resulting gain or loss is included in the
          determination of net loss.

          Research and Development

          Research and development costs are expensed as incurred.


                                       27
<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------


          Income Taxes

          The Company provides for income taxes under the liability method which
          requires recognition of deferred tax liabilities and assets for the
          expected future tax consequences of events that have been included in
          the financial statements or tax returns. Under this method, deferred
          tax liabilities and assets are determined based on the difference
          between the financial statement basis of assets and liabilities using
          enacted tax rates in effect for the year in which the differences are
          expected to reverse. The Company records a full valuation allowance.

          Revenue Recognition

          Revenue is recognized under collaborative research and development
          agreements as earned based upon the performance requirements of each
          agreement. Payments received in advance under these agreements are
          recorded as deferred contract revenue until earned.

          Financial Instruments

          Cash, cash equivalents and marketable securities are financial
          instruments which potentially subject the Company to concentrations of
          credit risk. The Company invests its excess cash in corporate
          obligations rated as A or better by Moody's Investment Rating Service,
          U.S. Treasury securities, and money market instruments.

          Computation of Net Loss Per Share

          Net loss per common share is computed based upon the weighted average
          number of common shares and common equivalent shares (using the
          treasury stock method) outstanding after certain adjustments described
          below. Common equivalent shares consist of common stock options and
          warrants when dilutive. In accordance with Securities and Exchange
          Commission Staff Accounting Bulletin No. 83, all common and common
          equivalent shares issued during the twelve-month period prior to the
          initial public offering ("cheap stock"), which was effective on
          February 10, 1994, have been included in the calculation as if they
          were outstanding for all periods prior to the IPO using the treasury
          stock method and the initial public offering price of $8.50 per share.
          During 1994, 42,122 shares of cheap stock was included in the weighted
          average number of common and common equivalent shares outstanding
          until February 10, 1994.

          Fully diluted net loss per common share is not presented as it is the
          same as primary net loss per share.

          Related Parties

          Certain members of the Company's Board of Directors are also retained
          as consultants by the Company. Management believes the consulting
          agreements have been negotiated at an "arms-length" basis and are
          immaterial. Included in other assets is a note receivable from an
          officer and shareholder in the amount of $30,000 at December 31, 1996
          and 1995 bearing interest at prime plus 1% and payable upon
          termination.


                                       28
<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------


          Recently Issued Accounting Pronouncements

   
          In February 1997, the Financial Accounting Standards Board issued
          Statement of Financial Accounting Standards No. 128, "Earnings Per
          Share" (SFAS 128), which is effective for fiscal years ending after
          December 15, 1997, including interim periods. Earlier application is
          not permitted. SFAS 128 specifies the computation, presentation, and
          disclosure requirements for earnings per share and is substantially
          similar to the standard recently issued by the International
          Accounting Standards Committee entitled International Accounting
          Standards, Earnings Per Share (IAS 33). The Company plans to adopt
          SFAS 128 in 1997 and has not yet determined the impact.
    


C.     Marketable Securities:

          The marketable securities of the Company, consisting of corporate
          obligations and U. S. Government Agencies have been classified as
          available for sale. Realized gains and losses on disposition of
          securities are determined on the specific identification method and
          are reflected in the statement of operations. Net unrealized gains and
          losses are recorded directly in a separate stockholders' equity
          account, except those losses that are deemed to be other than
          temporary, which losses, if any, are reflected in the statement of
          operations.

          Fair values are estimated based on quoted market prices. Interest is
          recognized when earned. The amortized cost of debt securities is
          adjusted for amortization of premiums and accretion of discounts to
          maturity. Such amortization and interest are included in interest
          income.

         The following table presents the amortized cost, fair value and
         unrealized gains and losses of the marketable securities for the years
         ended December 31, 1996 and 1995.

<TABLE>
<CAPTION>
                                                            1996
                  ----------------------------------------------------------------------------------------

                                                   Amortized                                         Unrealized
                                                     Cost                  Fair Value                  (Loss)
                                                     ----                  ----------                  ------
         <S>                                        <C>                     <C>                       <C>
         Marketable securities, current:

                  U.S. Government Agencies:         $4,006,463              $4,001,625                $(4,838)
                                                     ---------               ---------                  ------
                                                    $4,006,463              $4,001,625                $(4,838)
                                                     =========               =========                 =======
</TABLE>

<TABLE>
<CAPTION>
                                                            1995
                 -----------------------------------------------------------------------------------------

                                                   Amortized                                         Unrealized
                                                     Cost                  Fair Value                   Gains
                                                     ----                  ----------                   -----
         <S>                                        <C>                     <C>                         <C>
         Marketable securities, current:

                  Corporate Obligations             $2,004,582              $2,005,670                  $1,088
                                                     ---------               ---------                   -----
                                                    $2,004,582              $2,005,670                  $1,088
                                                     =========               =========                   =====
</TABLE>

          The contractual maturities of all securities available for sale was
          one month.


                                       29
<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------


D.     Property and Equipment:

       Property and equipment consisted of the following:

                                                          December 31,
                                                          ------------
                                                   1996               1995
                                                   ----               ----

          Laboratory equipment                   $3,845,739      $4,055,403
          Furniture and fixtures                    147,123         151,044
          Office equipment                          547,476         476,387
          Leasehold improvements                  1,164,570       1,162,596
                                                  ---------       ---------
                                                 $5,704,908      $5,845,430

          Less:  accumulated depreciation
                    and amortization           $(3,841,708)    $(3,030,110)
                                                -----------     -----------

       Property and equipment, net               $1,863,200      $2,815,320
                                                 ==========      ==========

        Depreciation and amortization expense amounted to $1,250,008, $962,635
        and $871,294 and for the years ended December 31, 1996, 1995 and 1994,
        respectively.

        Included above in property and equipment are the following assets that
        were acquired pursuant to capital lease arrangements: 

                                                           December 31, 
                                                           ------------
                                                   1996                1995
                                                   ----                ----

          Laboratory equipment                    $2,568,918        $2,972,492
          Furniture and fixtures                     119,557           123,478
          Office equipment                           213,570           244,484
          Leasehold improvements                     273,008           273,008
                                                     -------        ----------
                                                  $3,175,053        $3,613,462

          Less:  accumulated amortization       $(1,759,347)      $(1,465,590)
                                                 -----------       -----------

                                                  $1,415,706        $2,147,872
                                                  ==========        ==========

E.        Stockholders' Equity:

          Common Stock

          On May 17, 1996, the Company completed a self-managed private
          placement of units. Each Unit consisted of one share of the Company's
          Common Stock and one callable warrant to purchase one share of the
          Company's Common Stock. The Warrants are subject to redemption by the
          Company upon 30 days prior notice to the holders of the Warrants
          beginning May 17, 1998 at a price of $0.01 per Warrant Share in the
          event that the average closing price of the Company's Common Stock for
          any 20 consecutive trading day period exceeds $3.75. The initial
          exercise price of the Warrants per share of common stock is $2.50. The
          Company received proceeds of $11,579,080 for the issuance of 4,738,274
          Units. The Company incurred additional costs in the amount of $550,789
          related to this financing which were charged to additional paid-in
          capital in 1996.


                                       30

<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------


          On February 8, 1996 the Company closed on a second public offering.
          The Company received proceeds of $4,920,373 (net of underwriting
          discount and underwriter's offering expenses) for the issuance of
          2,200,000 shares of Common Stock. On March 27, 1996, the associated
          overallotment option was partially exercised and the Company issued
          and sold an additional 150,000 shares of the Company's Common Stock
          resulting in net proceeds to the Company of $343,125. The Company
          incurred costs in the amount of $152,773 related to this financing at
          December 31, 1995. The deferred financing costs were charged to
          additional paid-in capital in 1996.

          On February 17, 1994, the Company closed its initial public offering.
          The Company received proceeds of $18,612,284 (net of underwriting
          discount and underwriter's offering expenses) for the issuance of
          2,415,000 shares of common stock. In addition, all of the outstanding
          shares of redeemable convertible preferred stock (the "Preferred
          Stock") converted automatically into 3,477,377 shares of common stock.

   
          Each holder of common stock is entitled to one vote for each share of
          common stock held. Each share of common stock issued and outstanding
          is identical in all respects to each other share. The Company has
          reserved at December 31, 1996, and kept available out of the
          authorized but unissued shares of common stock, 6,372,394 shares for
          issuance upon the exercise of outstanding options and warrants.
    

          1989 Stock Plan

          Under the Company's 1989 Stock Plan (the "Plan") adopted by the Board
          of Directors during 1989, and subsequently amended and restated, the
          Company is permitted to sell or award common stock or to grant stock
          options for the purchase of common stock to employees, officers and
          consultants up to a maximum of 1,137,118 shares. In March 1996, the
          Board of Directors approved an amendment to the Plan to increase the
          number of shares covered by the Plan by 250,000, which amendment was
          approved by the stockholders at the 1996 Annual Meeting of
          Stockholders.

          The Plan provides for the granting of incentive stock options (ISOs)
          and nonqualified stock options. In the case of ISOs, the exercise
          price shall not be less than 100% (110% in certain cases) of the fair
          market value per share of the common stock, on the date of grant. In
          the case of nonqualified options, the exercise price shall be not less
          than the lesser of (a) book value per share of common stock as of the
          fiscal year of the Company immediately preceding the date of such
          grant, or (b) 50% of the fair market value of the common stock on the
          date of grant. All stock options under the Plan have been granted at
          exercise prices at least equal to the fair market value of the common
          stock.

          The options either become exercisable immediately on the date of grant
          or shall become exercisable in such installments as the Compensation
          Committee may specify, generally over a 4 year period. Each option
          shall expire on the date specified by the Compensation Committee, but
          not more than ten years and one day from the date of grant in the case
          of nonqualified options, and generally ten years from the date of
          grant in the case of ISOs (five years in certain cases).


                                       31
<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------


          Supplemental Disclosures for Stock-Based Compensation

          The Company applies APB Opinion No. 25 and related Interpretations in
          accounting for its stock option plans. Statement of Financial
          Accounting Standards No. 123 "Accounting for Stock-Based
          Compensation", ("SFAS 123") issued in 1995, defined a fair value
          method of accounting for stock options and other equity instruments.
          Under the fair value method, compensation cost is measured at grant
          date based on the fair value of the award and is recognized over the
          service period, which is usually the vesting period. The Company
          elected to continue to apply the accounting provisions of APB Option
          No. 25 for stock options. The required disclosures under SFAS 123 as
          if the Company had applied the new method of accounting are made
          below.

          Activity under all stock plans related to all the ISOs and
          nonqualified stock options for the three years ended December 31, 1996
          was as follows:

   
<TABLE>
<CAPTION>
                                                     ISO          Nonqualified                     Weighted Avg.
                                                     Shares           Shares       Option Price    Exercise Price
                                                     ------       ------------     ------------    --------------
         <S>                                         <C>            <C>            <C>                  <C>
         Outstanding at December 31, 1993            481,199        280,202        $1.00-$12.75         $3.63
                                                     -------        -------

         Granted                                     182,311         71,478        $2.63-$10.50         $7.86
         Exercised                                   (12,746)        (7,104)       $1.00-$5.60          $3.15
         Canceled                                    (83,535)       (65,096)       $1.00-$10.00         $7.29
                                                     ------        -------

         Outstanding at December 31, 1994            567,229        279,480        $1.00-$12.75         $4.77
                                                     -------        -------

         Granted                                     160,500        101,660        $2.13-$8.25          $3.21
         Exercised                                   (25,052)       (17,472)       $1.00-$5.35          $1.39
         Canceled                                    (67,548)        (3,000)       $1.00-$10.50         $5.84
                                                    --------        -------

         Outstanding at December 31, 1995            635,129        360,668        $1.00-$12.75         $4.43
                                                     -------        -------

         Granted                                     466,850         51,806        $1.25-$3.25          $1.53
         Exercised                                   (51,059)        (5,000)       $1.00-$2.68          $1.18
         Canceled                                   (207,672)      (238,360)       $1.00-$12.75         $3.74
                                                   ---------      ---------

         Outstanding at December 31, 1996            843,248        169,114        $1.00-$12.75         $3.49
                                                     =======        =======        ============         =====
</TABLE>
    

         Summarized information about stock options outstanding at December 31,
         1996 is as follows:

   
<TABLE>
<CAPTION>
                                               Weighted Avg.
             Range of       No. of Options       Remaining      Weighted Avg.      Number of       Weighted Avg.
         Exercise Prices     Outstanding       Contract. Life   Exercise Price      Options        Exercise Price
         ---------------    --------------     --------------   --------------     ---------       --------------
           <S>                   <C>                <C>            <C>                <C>              <C>
             $1.00-$1.25         471,827            8.23            $ 1.19             120,132          $ 1.01
             $2.13-$5.55         298,081            7.64              3.25             147,593            4.10
             $5.60-$8.50         182,248            7.24              7.51             115,927            7.62
           $10.00-$12.75          60,206            7.15             11.49              31,103           11.45
</TABLE>

         Options for the purchase of 414,755 shares, 572,398 shares, and 469,216
         shares are exercisable at December 31, 1996, 1995 and 1994,
         respectively. The total exercise proceeds for all options outstanding
         at December 31, 1996 is approximately $3,533,143.
    

                                       32
<PAGE>

                                  PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------

         The fair value of each option grant is estimated on the date of grant
         using the Black-Scholes option pricing model with the following
         assumptions:

   
                                               1996             1995
                                               ----             ----
         Dividend yield                        None             None
         Expected volatility                     75%              75%
         Risk free interest rate               6.25%            6.96%
         Expected life of option                5.0              5.0

         All options granted in 1996 and 1995 were granted at fair value. The
         weighted average fair value of options granted was $1.01 and $2.12 for
         1996 and 1995, respectively.

         Had compensation cost for the Company's stock option plans been
         determined based on the fair value at the grant date for awards made in
         1996 and 1995 consistent with the provisions of SFAS No. 123, the
         Company's net loss and loss per share would have been increased to the
         pro forma amounts shown below:

                                                     1996               1995
                                                     ----               ----
         Net loss - as reported                 $(11,235,760)      $(11,712,287)
         Net loss - pro forma                   $(11,455,536)      $(11,950,312)
         Loss per share - as reported                  $(.97)            $(1.82)
         Loss per share - pro forma                    $(.99)            $(1.86)

         The effects of applying SFAS 123 in the pro forma disclosure are not
         indicative of future amounts. SFAS 123 does not apply to awards made
         prior to 1995.
    

         Director Stock Option Plan

         In June 1994, the stockholders of the Company adopted the 1994 Director
         Stock Option Plan (the "Director Plan"). The Director Plan was
         established to attract and retain highly qualified, non-employee
         directors. The price per share for each option granted under this plan
         shall be the current fair market value at date of grant. The options
         vest over a period of three years and have a term of ten years. The
         aggregate number of shares of the Company's common stock which may be
         optioned under this plan is 150,000 shares. There were 30,000 shares
         granted under this plan in the year ended December 31, 1995.
         No shares were granted in the year ended December 31, 1996.

         1994 Employee Stock Purchase Plan

   
         In April 1994, the Board of Directors adopted the 1994 Employee Stock
         Purchase Plan (the "1994 Plan"). Under the 1994 Plan, eligible
         employees of the Company may purchase shares of Common Stock, through
         payroll deductions, at the lower of 85% of fair market value of the
         stock at the time of grant or 85% of fair market value at the time of
         exercise. A total of 250,000 shares have been reserved for issuance
         under the 1994 Plan. Shares are granted twice yearly, on February 28
         and August 31, and are exercisable upon issuance. The Company issued
         60,004 and 72,906 shares in 1996 and 1995, respectively. 

         The weighted average fair values of options granted at fair value under
         the 1994 Plan during 1996 and 1995 were $1.00 and $1.20, respectively.
    

         Common Stock Warrants

         On December 16, 1992, the Company issued warrants, which expire on
         December 16, 1997, to purchase an aggregate of 4,151 shares of common
         stock at an initial exercise price of $6.02 in connection with a bridge
         loan to the Company in the amount of $250,000, which was subsequently
         repaid with interest thereon. In January 1993, the Company 


                                       33

<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------

         issued warrants, which expire on December 14, 1998, to purchase 80,331
         shares of the Company's common stock to an underwriter at an initial
         exercise price of $7.23 per share, in connection with the private
         placement of the Class F Preferred Stock.

         On February 10, 1994, in connection with the closing of the initial
         public offering the Company's underwriter purchased for $210.00
         warrants to purchase 210,000 shares of the Company's common stock at an
         exercise price of $11.90 per share. The warrants expire on February 10,
         1999.

   
         On April 1, 1994, in connection with the Company's $2 million master
         lease agreement, the Company issued common stock warrants for a
         purchase price of $350.00 to purchase 35,000 shares of common stock at
         a price of $8.50 per share at any time on or after April 1, 1995 and on
         or before April 1, 1999.

         On September 11, 1995, the Company issued common stock warrants for a
         purchase price of $300.00 to purchase 30,000 shares of the Company's
         common stock to Oppenheimer & Co., Inc. at an exercise price of $7.00
         per share, in connection with the engagement of Oppenheimer & Co., Inc.
         to provide investment banking services to the Company. These warrants
         are exercisable beginning September 11, 1996 and expire September 10,
         2000.

         On January 6, 1997, the Company issued a common stock warrant to
         purchase 75,000 shares of the Company's common stock to Furman Selz LLC
         at an exercise price of $1.50 per share in connection with financial
         advisory services to the Company. This warrant is exercisable beginning
         January 6, 1997 and expires on January 6, 2002.

         On February 14, 1996, the Company issued common stock warrants for a
         purchase price of $220.00 to purchase up to 220,000 shares of the
         Company's common stock to Commonwealth Associates at an exercise price
         of $3.13 per share in connection with a public financing. These
         warrants are exercisable beginning February 14, 1997 and expire on
         February 13, 2001.

         In August 1991 and September 1992, the Company issued warrants to
         purchase up to 30,240 and 20,000 shares, respectively, of the Company's
         Class D Preferred Stock (the "Class D Warrants") at a minimum exercise
         price of $2.50 per share, in connection with leasing arrangements. The
         Class D Warrants were automatically converted into 18,771 warrants to
         purchase shares of common stock at an exercise price of $6.69 per share
         upon the closing of the Company's initial public offering on February
         17, 1994. The warrants expire on February 10, 1999.
    

         In connection with promissory notes issued in September 1992, the
         Company granted warrants to acquire an aggregate of 88,888 shares of
         Class F Preferred Stock at an exercise price of $2.25 per share. Upon
         conversion of all Class F Preferred Stock effected by the initial
         public offering, the warrants converted into warrants to purchase
         33,212 shares of common stock at an exercise price of $6.02 per share.
         In the year ended December 31, 1995, 9,707 of these warrants were
         exercised. The warrants expire on September 15, 1997.

F.      Collaborative Research and Development Agreements:

        In February 1990, the Company entered into a Research Collaboration and
        License Agreement with E.R. Squibb & Sons, Inc., ("Bristol-Myers
        Squibb") covering the development of a core technology based on the
        understanding of T cell antigen receptors ("TCRs").


                                       34

<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------


        Bristol-Myers Squibb agreed to pay the Company approximately $10 million
        in product research funding. This research funding was paid on a
        quarterly basis for the 5 year period through fiscal year 1994 and
        totaled approximately $10 million. The Company received $0, $28,645 and
        $1,701,600 in funded research for the years ended December 31, 1996,
        1995 and 1994 respectively. The Research Collaboration and License
        Agreement ended as scheduled in February 1995.

   
        In September 1993, the Company signed a Research and Development
        Agreement with Sandoz Pharma Ltd. (the "Sandoz Agreement") to identify
        and develop compounds which bind to CD4 or CD2, or their respective
        ligands, and interfere with their interaction, as therapeutic agents for
        immune suppression. Effective as of September 1, 1995, the Company's
        sponsored research agreement with Sandoz Pharma Ltd. was amended to
        focus the research program on compounds targeting CD4 and its ligand and
        to limit the research program with respect to compounds that bind to CD2
        and its ligand to certain screening activities being conducted by Sandoz
        through the end of 1995. In connection with this amendment, the research
        and license fees due for the third year of the research program were
        reduced from $5 million to $2.2 million. Of the $2.2 million received,
        $925,000 was recorded as revenue in 1995 and $1.275 million as deferred
        revenue at December 31, 1995 and was subsequently recorded as revenue in
        1996. Under the terms of the Sandoz Agreement, the Company has received
        $14.2 million in initial license fees and research funding to date.
    

        In 1994, the Company received $8,000,000 and recorded as revenue
        $5,000,000 for research performed by the Company under the Sandoz
        agreement. The $3,000,000 was advance payment for research to be
        performed in fiscal year 1995 and is recorded as deferred revenue at
        December 31, 1994 and was subsequently recorded as revenue in 1995.

        In March 1994, the Company in conjunction with Dana-Farber Cancer
        Institute and Harvard University received a four-year grant from the
        National Cooperative Drug Discovery Group (NCDDG) of the National
        Institutes of Health (NIH) to conduct AIDS research. The Company
        received $105,264 in revenue in the year ended December 31, 1995 related
        to this grant. In the years ended December 31, 1996 and 1994 the Company
        received no revenue under this grant.

        In January 1996, Procept entered into a Sponsored Research Agreement
        with VacTex, Inc. ("VacTex"), an entity created by a group of executives
        and scientists from leading biotechnology companies and academic
        institutions to provide research services relating to the development of
        novel vaccines based on discoveries licensed from the Brigham and
        Women's Hospital and Harvard Medical School. These discoveries shed
        light on a previously unknown aspect of immunology, the CD1 system of
        lipid antigen presentation.

        Under the Sponsored Research Agreement, Procept will conduct specified
        research tasks on behalf of VacTex for which Procept will receive a
        combination of cash and equity in VacTex based on the number of
        full-time equivalent employees of Procept engaged in the research, but
        subject to maximum cash and stock limits. Currently, Procept has neither
        invested cash in, nor transferred technology to, VacTex. At any time
        until the earlier of December 1997 or the termination of the Sponsored
        Research Agreement by VacTex, Procept may exercise an option to purchase
        all of the outstanding capital stock of VacTex at a fixed price. If
        Procept does not exercise this option, it must issue Procept Common
        Stock warrants to VacTex or its stockholders to purchase an aggregate of
        100,000 shares of Common Stock at an 


                                       35

<PAGE>


                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------

        exercise price of $3.50 per share. The warrants will expire five years
        after the date of issuance.

        In the year ended December 31, 1996, the Company recorded revenue of
        $562,500 which consisted of $412,500 in cash and 150,000 shares of
        VacTex common stock. At December 31, 1996, the Company had an accounts
        receivable of $172,812, which was subsequently paid in March 1997, and
        an investment in VacTex of $150,000 included in its other assets.

G.      Income Taxes:

   
        No federal or state income taxes have been provided for as the Company
        has incurred losses since its inception. At December 31, 1996, the
        Company had Federal and State tax net operating loss ("NOL")
        carryforwards of approximately $48,420,000 and $40,607,000 which will
        expire beginning in the year 2000 through 2011 for Federal and beginning
        in the year 1997 through 2001 for State, respectively. Additionally, the
        Company had Federal and State research and experimentation credit
        carryforwards of approximately, $1,209,000 and $738,000, respectively,
        both of which will expire in the year 2011.
    

        The Internal Revenue Code of 1986 (the "Code") contains provisions which
        limit the net operating loss carryforwards and tax credits available to
        be used in any given year upon the occurrence of certain events,
        including significant changes in ownership interests. In conjunction
        with the initial public offering, such a change in ownership as defined
        in the Code occurred. Accordingly, certain available NOL carry forwards
        and tax credits are subject to these limitations.

   
        The components of Procept's net deferred tax assets were as follows at
        December 31:
    

                                                     1996           1995
                                                     ----           ----
        Net deferred tax assets:
            Net operating loss carryforwards       $19,021,000    $14,910,000
            Tax credit carryforwards                 1,947,000     1,390 ,000
            Depreciation                             1,057,000        780,000
            Vacation and benefits                       22,000         36,000
            Capital leases and other                  (957,000)      (670,000)
            Valuation allowance                    (21,090,000)   (16,446,000)
                                                  ------------   ------------

        Total net deferred tax assets               $        0    $         0
                                                    ==========    ===========

        As required by Financial Accounting Statement No 109, management of the
        Company has evaluated the positive and negative evidence bearing upon
        the realizability of its deferred tax assets which are comprised
        principally of net operating loss and tax credit carryforwards.
        Management has considered the Company's history of losses and concluded,
        in accordance with the applicable accounting standards, that it is more
        likely than not that the Company will not recognize the benefit of the
        net deferred tax assets. Accordingly, the deferred tax assets have been
        fully reserved. Management re-evaluates the positive and negative
        evidence on an annual basis.

H.      Savings and Retirement Plan:

        On July 1, 1990, the Company established the Procept, Inc. Savings and
        Retirement Plan (the "401(k) Plan"), a profit-sharing plan under Section
        401 of the Code. Employees are


                                       36

<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------


        eligible to participate in the 401(k) Plan by meeting certain
        requirements, including length of service and minimum age. The Company
        may contribute to the 401(k) Plan, without regard to current or
        accumulated net profits, in an amount not to exceed the maximum
        allowable under applicable provisions of the Code. The amount is to be
        allocated to active participants based on their annual pay as a
        percentage of the total annual pay of all such participants.
        Participants may also contribute to the 401(k) Plan, but no more than
        the maximum permissible amount allowed by regulatory definitions. For
        the years ended December 31, 1996, 1995 and 1994, the Company did not
        contribute to the 401(k) Plan.

I.      Commitments:

           Operating Leases

           On February 28, 1989, the Company entered into an operating lease
           arrangement for its facility. The Company has made several amendments
           to its operating lease arrangement for its facility to include
           additional leased space and extension of the lease terms. The
           commitment under the operating lease requires the Company to pay
           monthly base rent and an allocable percentage of operating costs and
           property taxes.

           The monthly base rent is subject to increases during the course of
           the lease term which are unrelated to increases in utilized space.
           Accordingly, the Company is providing for rent expense based on an
           amortization of the lease payments on a straight-line basis over the
           life of the lease arrangement.

           Pursuant to the aforementioned leasing arrangements, at December 31,
           1996 and 1995, the Company has recorded noncurrent liabilities of
           $285,529 and $273,179, respectively, for rent expense in excess of
           cash expenditures for leased facilities.

           Rent expense for leased facilities and equipment amounted to
           approximately $1,574,000, $1,661,000 and $1,446,000, for the years
           ended December 31, 1996, 1995 and 1994, respectively. The approximate
           future minimum annual rental payments for leased facilities for the
           next five years under the lease arrangements consist of the following
           at December 31,1996:

                     1997               $1,349,138
                     1998               $1,392,261
                     1999               $1,435,379
                     2000                 $739,455

           Pursuant to the facility lease agreement, the Company has provided an
           open letter of credit for the term of its leases in the amount of
           $369,000 and $422,000 at December 31, 1996 and 1995, respectively,
           which would provide for payment to the lessor of its main facility in
           the event of default by the Company. The Company held a certificate
           of deposit, which is classified as a restricted investment (see also
           Note J), solely for the purpose of collateralizing this letter of
           credit in the amount of $369,000 and $422,000 at December 31, 1996
           and 1995, respectively.


                                       37
<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------


           Capital Leases

           In 1992, the Company entered into a leasing agreement which allowed
           the Company to lease up to $1,000,000 of capital equipment at
           implicit interest rates ranging from approximately 11% to 13% for a
           42 month term.

           In 1994, the Company entered into a $2 million master lease agreement
           for the lease and sale/leaseback of certain equipment and leasehold
           improvements. The implicit interest rates for the leases under this
           agreement range from approximately 5.5% to 7% for a 36 month term.
           During fiscal year 1994, the Company purchased and leased $711,243 of
           laboratory equipment, office equipment and furniture and fixtures
           pursuant to this leasing arrangement. During fiscal year 1995, the
           Company purchased and leased $1,266,773 of laboratory equipment,
           office equipment and leasehold improvements pursuant to this leasing
           arrangement. These equipment leasing agreements have been fully
           utilized at December 31, 1996.

           Future minimum lease payments with initial or remaining terms of one
           year or more consist of the following at December 31, 1996:

                           1997                                   637,529
                           1998                                    20,519
                                                                   ------

               Total future minimum lease payments                658,048

               Less:  amount representing interest                (23,754)

               Present value of future minimum lease
                  payments                                        634,294

               Less:  current portion                            (614,063)
               
               Capital lease obligations, less current portion    $20,231
                                                                  =======

           Contract Research

           In February 1987, the Company entered into a Research and Licensing
           Agreement with Dana-Farber, a Massachusetts not-for-profit
           corporation. As part of the Agreement, the Company has agreed to fund
           certain research and development projects conducted by Dana-Farber in
           relation to the development and eventual commercialization of
           products related to T cell activation. To the extent that an
           invention is developed at Dana-Farber with principal support and
           funding by the Company, the Company shall have the exclusive rights
           to use the invention. As part of this arrangement, the Company is
           required to pay to Dana-Farber, when product sales commence, certain
           royalties based on a formula stipulated in the Agreement. In May
           1993, the Company agreed to extend funding of the research through
           April 1998.

           The approximate future minimum annual research payments to be
           provided to Dana-Farber consist of the following at December 31,
           1996:

                           1997                  $909,442
                           1998                  $316,094


                                       38

<PAGE>

                                 PROCEPT, INC.
                    NOTES TO FINANCIAL STATEMENTS, CONTINUED

                                ----------------


           The amount of contract research costs under the Agreement incurred by
           the Company and included in research and development expense amounted
           to $809,000, $785,000 and $782,000 in 1996, 1995 and 1994,
           respectively. The Company has accrued $414,888 and $394,278 at
           December 31, 1996 and 1995, respectively, payable to Dana-Farber
           under this Agreement.

J.         Note Payable:

           On February 15, 1995, the Company signed a term note with
           Bristol-Myers Squibb Company in the amount of $115,851. The term note
           provided for scheduled payments of $38,617 on April 1, July 1, and
           October 1, 1996. The interest rate for the note was 8.0%. Upon the
           occurrence of certain financing events, the entire balance of the
           note, including all accrued and unpaid interest, became due and
           payable. This Note was repaid in full in 1996 upon the closing of the
           secondary offering.


           Line of Credit:

           The Company maintains a $100,000 line of credit through the use of
           corporate credit cards. This line of credit is collateralized with a
           certificate of deposit of $100,000 and is classified as a restricted
           investment on the balance sheet. The certificate of deposit is
           recorded at cost, which approximates market. Interest earned on the
           certificate of deposit is not restricted; accordingly, any accrued
           interest is considered a cash equivalent. See also Note B.


                                       39


<PAGE>




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.

(a) The information required by Item 10 with respect to the directors of the
Company is included under the caption "Election of Directors" in the Company's
definitive proxy statement for its 1997 Annual Meeting of Stockholders (the
"Proxy Statement") and is incorporated herein by reference.

(b) The information required by Item 10 concerning executive officers of the
Company is included under the caption "Executive Officers of the Registrant"
under Item 1A of this Report.

   
(c) The information concerning disclosure pursuant to Item 405 of Regulation S-K
is included under the caption "Compliance with Section 16(a) of the Securities
Exchange Act" in the Proxy Statement and is incorporated herein by reference.
    


ITEM 11. EXECUTIVE COMPENSATION.

The information required by Item 11 is included under the captions "Compensation
Committee Interlocks and Insider Participation", "Election of Directors-Director
Compensation" and "Executive Compensation" in the Proxy Statement and is
incorporated herein by reference.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.

The information required by Item 12 is included under the caption "Share
Ownership" in the Proxy Statement and is incorporated herein by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.

The information required by Item 13 is included under the caption "Certain
Transactions" in the Proxy Statement and is incorporated herein by reference.


                                       40
<PAGE>



                                     PART IV

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

(a)    1.         FINANCIAL STATEMENTS.

                  The financial statements are listed under Part II, Item 8 of
                  this Report.

       2.         FINANCIAL STATEMENT SCHEDULES.

                  None.

       3.         EXHIBITS.

                  The exhibits are listed under Part IV, Item 14(c) of this
                  Report.

(b)               REPORTS ON FORM 8-K.

                  The Company filed no reports on Form 8-K during the last
                  quarter of 1996.

(c)               EXHIBITS.

Exhibit
   No.                                        Description
- -------                                       -----------

    3.1        Restated Certificate of Incorporation of the Company. Filed as
               Exhibit 3.1 to the Company's Form 10-Q for the quarter ended June
               30, 1996 and incorporated herein by reference.

    3.2        By-laws of the Company. Filed as Exhibit 3.2 to the Company's
               Registration Statement on Form S-1, Commission File No. 33-57188,
               and incorporated herein by reference.

    4.1        Specimen Stock Certificate for Common Stock $.01 par value. Filed
               as Exhibit 4.1 to the Company's Registration Statement on Form
               S-1, Commission File No. 33-57188, and incorporated herein by
               reference.

    4.2        Warrant Agreement to Purchase Class D Convertible Preferred Stock
               dated August 1, 1991, issued to Comdisco, Inc. Filed as Exhibit
               4.2 to the Company's Registration Statement on Form S-1,
               Commission File No. 33-57188, and incorporated herein by
               reference.

    4.3        Warrant Agreement to Purchase Class D Convertible Preferred Stock
               dated September 11, 1992, issued to Comdisco, Inc. Filed as
               Exhibit 4.3 to the Company's Registration Statement on Form S-1,
               Commission File No. 33-57188, and incorporated herein by
               reference.

    4.4        Form of Warrant to Purchase Class F Convertible Preferred Stock
               dated September 15, 1992 and Schedule of Holders. Filed as
               Exhibit 4.4 to the Company's Registration Statement on Form S-1,
               Commission File No. 33-57188, and incorporated herein by
               reference.


                                       41
<PAGE>



    4.5        Form of Warrant to Purchase Common Stock dated December 16, 1992
               and Schedule of Holders. Filed as Exhibit 4.5 to the Company's
               Registration Statement on Form S-1, Commission File No. 33-57188,
               and incorporated herein by reference.

    4.6        Warrant to Purchase Common Stock dated January 5, 1993, issued to
               Tucker Anthony Incorporated. Filed as Exhibit 4.6 to the
               Company's Registration Statement on Form S-1, Commission File No.
               33-57188, and incorporated herein by reference.

    4.7        Warrant to Purchase Common Stock dated as of February 17, 1994,
               issued to D. Blech & Company, Incorporated. Filed as Exhibit 4.6
               to the Company's Form 10-K for the year ended December 31, 1994
               and incorporated herein by reference.

    4.8        Warrant Agreement dated February 17, 1994 between the Company and
               D. Blech & Company, Incorporated. Filed as Exhibit 4.7 to the
               Company's Form 10-K for the year ended December 31, 1994 and
               incorporated herein by reference..

    4.9        Warrant to Purchase Common Stock dated as of April 1, 1994,
               issued to Hambrecht & Quist Guaranty Finance, L.P. Filed as
               Exhibit 4 to the Company's Form 10-Q for the quarter ended March
               31, 1994, Commission File No. 0-21134, and incorporated herein by
               reference.

    4.10       Warrant to Purchase Common Stock dated as of September 11, 1995,
               issued to Oppenheimer & Co., Inc. Filed as Exhibit 4.10 to the
               Company's Registration Statement on Form S-1, Commission File No.
               33-96798, and incorporated herein by reference.

    4.11       Form of Warrant Agreement between the Company and Commonwealth
               Associates. Filed as Exhibit 4.11 to the Company's Registration
               Statement on Form S-1, Commission File No. 33-96798, and
               incorporated herein by reference.

    4.12       Form of Warrant to Purchase Common Stock dated May 17, 1996 and
               schedule of holders. Filed herewith.

    4.13       Warrant to Purchase Common Stock issued to Furman Selz LLC dated
               January 6, 1997. Filed herewith.

    10.1       Master Lease Agreement (equipment) dated as of August 1, 1991
               between the Company and Comdisco, Inc. Filed as Exhibit 10.1 to
               the Company's Registration Statement on Form S-1, Commission File
               No. 33-57188, and incorporated herein by reference.

    10.2       Master Lease Agreement (equipment) dated as of September 11, 1992
               between the Company and Comdisco, Inc. Filed as Exhibit 10.2 to
               the Company's Registration Statement on Form S-1, Commission File
               No. 33-57188, and incorporated herein by reference.

    10.3       Master Lease Agreement (equipment) dated as of April 1, 1994
               between the Company and Hambrecht & Quist Guaranty Finance L.P.
               Filed as Exhibit 10.3 to the Company's Form 10-Q for the quarter
               ended March 31, 1995, Commission File No. 0-21134, and
               incorporated herein by reference.


                                       42

<PAGE>

    10.4       The 1989 Stock Plan. Filed as Exhibit 10.3 to the Company's
               Registration Statement on Form S-1, Commission File No. 33-57188,
               and incorporated herein by reference.

    10.5       The 1994 Employee Stock Purchase Plan. Filed as Exhibit 99 to the
               Company's Registration Statement on Form S-8, Commission File No.
               33-81394, and incorporated herein by reference.

    10.6       The 1994 Director Stock Option Plan. Filed as Exhibit 99 to the
               Company's Registration Statement on Form S-8, Commission File No.
               33-81392, and incorporated herein by reference.

    10.7       Registration Rights Agreement dated as of January 5, 1993 among
               the Company and certain of its security holders named therein.
               Filed as Exhibit 10.4 to the Company's Registration Statement on
               Form S-1, Commission File No. 33-51788, and incorporated herein
               by reference.

    10.8       Amendment No. 1 to Registration Rights Agreement dated as of
               March 2, 1994 among the Company and certain of its security
               holders named therein. Filed as Exhibit 10.3 to the Company's
               Form 10-K for the year ended December 31, 1994, Commission File
               No. 0-21134, and incorporated herein by reference.

    10.9       Amendment No. 2 to Registration Rights Agreement dated as of
               September 11, 1995 between the Company and Oppenheimer & Co.,
               Inc. Filed as Exhibit 10.9 to the Company's Registration
               Statement on Form S-1, Commission File No. 33-96798, and
               incorporated herein by reference.

    10.10      Lease for 840 Memorial Drive dated February 28, 1989 between the
               Company and Robert Epstein et al., Trustee of the 840 Memorial
               Drive Trust, as amended February 28, 1989 and April 4, 1989.
               Filed as Exhibit 10.7 to the Company's Registration Statement on
               Form S-1, Commission File No. 33-57188, and incorporated herein
               by reference.

    10.11      Lease for 840 Memorial Drive dated August 21, 1990 between the
               Company and Robert Epstein et al., Trustee of 840 Memorial Drive
               Trust. Filed as Exhibit 10.8 to the Company's Registration
               Statement on Form S-1, Commission File No. 33-57188, and
               incorporated herein by reference.

    10.12      Lease for 840 Memorial Drive dated February 10, 1992 between the
               Company and Robert Epstein et al., Trustee of the 840 Memorial
               Drive Trust. Filed as Exhibit 10.9 to the Company's Registration
               Statement on Form S-1, Commission File No. 33-57188, and
               incorporated herein by reference.

    10.13      Lease for 840 Memorial Drive dated September 8, 1992 between the
               Company and Robert Epstein et al., Trustee of the 840 Memorial
               Drive Trust. Filed as Exhibit 10.10 to the Company's Registration
               Statement on Form S-1, Commission File No. 33-57188, and
               incorporated herein by reference.

    10.14      Lease for 840 Memorial Drive dated April 27, 1994 between the
               Company and Robert Epstein et al., Trustee of the 840 Memorial
               Drive Trust. Filed as Exhibit 10 to the Company's Form 10-Q for
               the quarter ended March 31, 1994, Commission File No. 0-21134,
               and incorporated herein by reference.


                                       43

<PAGE>

    10.15      Amended and Restated Research and Licensing Agreement dated as of
               February 19, 1987 between the Company and the Dana-Farber Cancer
               Institute, as amended by Letter Agreements between the Company
               and Dana-Farber Cancer Institute dated as of October 17, 1987,
               October 20, 1987, January 20, 1988, March 1, 1988, March 22,
               1989, March 27, 1989, March 5, 1990, May 3, 1993, May 4, 1993,
               May 10, 1993 and May 12, 1993 (as amended, the "DFCI Agreement").
               Filed as Exhibit 10.11 to the Company's Registration Statement on
               Form S-1, Commission File No. 33-57188, and incorporated herein
               by reference.

    10.16      Letter Agreements between the Company and Dana-Farber Cancer
               Institute dated April 29, 1994 and May 6, 1994, amending the DFCI
               Agreement. Filed as Exhibit 10.16 to the Company's Form 10-K for
               the year ended December 31, 1994, Commission File No. 0-21134,
               and incorporated herein by reference.

    10.17      Collaboration Agreement dated as of January 1, 1992 between the
               Company and the Molecular Modeling and Design Unit of the
               University of California, San Francisco. Filed as Exhibit 10.13
               to the Company's Registration Statement on Form S-1, Commission
               File No. 33-57188, and incorporated herein by reference.

    10.18      Confidential Screening Agreement dated as of July 24, 1992
               between the Company and the Division of Acquired Immunodeficiency
               Syndrome (AIDS), National Institute of Allergy and Infectious
               Diseases. Filed as Exhibit 10.14 to the Company's Registration
               Statement on Form S-1, Commission File No. 33-57188, and
               incorporated herein by reference.

    10.19      Extension of Consulting Agreement dated August 9, 1990 between
               the Company and Dr. Ellis L. Reinherz. Filed as Exhibit 10.17 to
               the Company's Registration Statement on Form S-1, Commission File
               No. 33-57188, and incorporated herein by reference.

    10.20      Non-Competition Agreement dated as of August 21, 1990 between the
               Company and Stanley C. Erck. Filed as Exhibit 10.18 to the
               Company's Registration Statement on Form S-1, Commission File No.
               33-57188, and incorporated herein by reference.

    10.21      Non-Competition Agreement dated as of January 11, 1992 between
               the Company and James C. Jenson. Filed as Exhibit 10.19 to the
               Company's Registration Statement on Form S-1, Commission File No.
               33-57188, and incorporated herein by reference.

    10.22      Key Employee Confidentiality, Inventions, and Non-Competition
               Agreement dated January 13, 1993 between the Company and A. James
               Ueberroth. Filed as Exhibit 10.20 to the Company's Registration
               Statement on Form S-1, Commission File No. 33-57188, and
               incorporated herein by reference.

    10.23      Consulting and Confidentiality Agreement dated as of May 1, 1994
               between the Company and Zola P. Horovitz, Ph.D. Filed as Exhibit
               10 to the Company's Form 10-Q for the quarter ended June 30,
               1994, Commission File No. 0-21134, and incorporated herein by
               reference.

   +10.24      Collaborative Research Agreement dated March 6, 1992 between the
               Company and the President and Fellows of Harvard College (re:
               Harrison). Filed as Exhibit 


                                       44

<PAGE>

               10.22 to the Company's Registration Statement on Form S-1, 
               Commission File No. 33-57188, and incorporated herein by 
               reference.

   +10.25      Collaborative Research Agreement dated March 2, 1994 among the
               Company, the President and Fellows of Harvard College and Howard
               Hughes Medical Institute (re: Harrison). Filed as Exhibit 10.27
               to the Company's Form 10-K for the year ended December 31, 1994,
               Commission File No. 0-21134, and incorporated herein by
               reference.

   +10.26      Sponsored Research Agreement dated August 4, 1992 between the
               Company and President and Fellows of Harvard College (re:
               Wagner). Filed as Exhibit 10.23 to the Company's Registration
               Statement on Form S-1, Commission File No. 33-57188, and
               incorporated herein by reference.

   +10.27      Research and Development Agreement between the Company and Sandoz
               Pharma Ltd. dated as of September 16, 1993. Filed as Exhibit
               10.24 to the Company's Registration Statement on Form S-1,
               Commission File No. 33-57188, and incorporated herein by
               reference.

   +10.28      Amendment No. 1 to Research and Development Agreement between the
               Company and Sandoz Pharma Ltd. dated as of January 25, 1995.
               Filed as Exhibit 10.30 to the Company's Form 10-K for the year
               ended December 31, 1994, Commission File No. 0-21134, and
               incorporated herein by reference.

   +10.29      The Second Amendment to Research and Development Agreement dated
               March 31, 1995 between the Company and Sandoz Pharma Ltd. Filed
               as Exhibit 10.2 to the Company's Form 10-Q for the quarter ended
               March 31, 1995, Commission File No. 0-21134, and incorporated
               herein by reference.

    10.30      Consulting and Confidentiality Agreement dated as of April 20,
               1995 between the Company and Max Link, Ph.D. Filed as Exhibit
               10.30 to the Company's Registration Statement on Form S-1,
               Commission File No. 33-96798, and incorporated herein by
               reference.

   +10.31      Third Amendment to Research and Development Agreement dated
               August 31, 1995 between the Company and Sandoz Pharma Ltd. Filed
               as Exhibit 10.32 to the Company's Registration Statement on Form
               S-1, Commission File No. 33-96798, and incorporated herein by
               reference.

   +10.32      Research Agreement dated as of March 1, 1993 between the Company
               and The General Hospital Corporation (re: Hirsh). Filed as
               Exhibit 10.25 to the Company's Registration Statement on Form
               S-1, Commission File No. 33-57188, and incorporated herein by
               reference.

   +10.33      Research Agreement dated as of March 1, 1993 between the Company
               and The General Hospital Corporation (re: Drake). Filed as
               Exhibit 10.26 to the Company's Registration Statement on Form
               S-1, Commission File No. 33-57188, and incorporated herein by
               reference.

   +10.34      Peptoid Library Screening Agreement dated September 27, 1994
               between the Company and Chiron Corporation. Filed as Exhibit 10.1
               to the Company's Form 10-Q for the quarter ended September 30,
               1994, Commission File No. 0-21134, and incorporated herein by
               reference.


                                       45

<PAGE>

    10.35      Underwriting Agreement dated February 8, 1996 between the Company
               and Commonwealth Associates. Filed as Exhibit 1 to the Company's
               Registration Statement on Form S-1, Commission File No. 33-96798,
               and incorporated herein by reference.

    10.36      Registration Rights Agreement dated January 6, 1997 between the
               Company and Furman Sez LLC. Filed herewith.

    23         Consent of Coopers & Lybrand L.L.P., independent accountants to
               Procept, Inc. Filed herewith.

    99.1       Important factors regarding forward-looking statements. Filed
               herewith

- -----------------------

+        Confidential treatment has been granted for the deleted portions
         Exhibits 10.15, 10.16, 10.17, 10.24, 10.25, 10.26, 10.27, 10.28, 10.29,
         10.32, 10.33 and 10.34.

         Exhibits 10.4 through 10.7, 10.19 through 10.23 and 10.30 are
         management contracts or compensatory plans, contracts or arrangements
         in which executive officers or directors of the Company participate.


                                       46
<PAGE>



                                   SIGNATURES

   
     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by on this 28th day of March, 1997.
    

                                PROCEPT, INC.
                                (Registrant)



                                By: /s/ Stanley C. Erck
                                        Stanley C. Erck,
                                        President and Chief Executive Officer


     Pursuant to the requirements of the Securities and Exchange Act of 1934,
this report has been signed below by the following persons on behalf of the
registrant and in the capacities indicated on this 28th day of March, 1997:

                                           Capacity
                                           --------

/s/ Stanley C. Erck             President, Chief Executive Officer
- --------------------------      and Director (Principal Executive Officer)
Stanley C. Erck


/s/ Michael J. Higgins          Chief Financial Officer
- --------------------------      (Principal Financial Officer and Principal
Michael J. Higgins              Accounting Officer)


/s/ Zola P. Horovitz            Director
- --------------------------
Zola P. Horovitz, Ph.D.


/s/ Max Link                    Director
- --------------------------
Max Link, Ph.D.


/s/ Ellis L. Reinherz           Director
- --------------------------
Ellis L. Reinherz, M.D.




THE WARRANTS REPRESENTED BY THIS CERTIFICATE AND THE OTHER SECURITIES ISSUABLE
UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED, AND MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO A REGISTRATION
STATEMENT UNDER SUCH ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO
COUNSEL FOR THE ISSUER THAT AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT IS
AVAILABLE. THE TRANSFER OR EXCHANGE OF THE WARRANTS REPRESENTED BY THIS
CERTIFICATE ARE FURTHER RESTRICTED AS DESCRIBED HEREIN.

                                  PROCEPT, INC.

                         Common Stock Purchase Warrants
No.____                                                         _________ Shares

             EXERCISABLE UNTIL 5:00 P.M., BOSTON TIME, MAY 17, 2001

     This Warrant Certificate certifies that ___________________________________
or its registered assigns, is the registered holder of Warrants to purchase
initially up to ____#____ fully-paid and non-assessable shares (the "Warrant
Shares") of common stock, $0.01 par value ("Common Stock") of Procept, Inc., a
Delaware corporation (the "Company"), at any time from November 17, 1996 until
5:00 p.m. Boston time on May 17, 2001 (the "Expiration Date"), unless sooner
redeemed pursuant to section 8 hereof, at the initial exercise price (the
"Exercise Price") of $2.50 per share of Common Stock, subject to the conditions
set forth herein. The number of Warrant Shares issuable hereunder and the
Exercise Price are each subject to adjustment as provided herein. No Warrant may
be exercised after 5:00 p.m., Boston time, on the Expiration Date, after which
time all Warrants evidenced hereby, unless exercised prior thereto, shall be
void.

1. Certain Definitions. As used herein the following terms, unless the context
otherwise requires, have the following respective meanings:

     1.1 The term "Company" shall include Procept, Inc. and any corporation that
shall succeed or assume the obligations of Procept, Inc. hereunder.

     1.2 The terms "Warrant" or "Warrants" mean these Warrants and any other
warrant or warrants issued in exchange or substitution for, or upon partial
exercise of, these Warrants.

     1.3 The term "Holder" means the registered holder(s) of this Warrant
Certificate.

2. Exercise of Warrants.

     2.1 Warrants may be exercised by the Holder hereof, at any time until 5:00
p.m. Boston time on the Expiration Date or 5:00 p.m. Boston Time on the last
business day before the Redemption Date (as defined in Section 8), as the case
may be, as to the whole or any lesser number of the Warrant Shares covered
hereby, by the surrender of this Warrant Certificate (with the election at the
end hereof duly executed) to the Company at its main office at 840 Memorial
Drive, Cambridge, Massachusetts ("Main Office"), or at such other place as may
be designated in writing by the Company, together with a certified or bank check
payable to the order of the Company in an amount equal to the Exercise Price
multiplied by the number of Warrant Shares for which such Warrants are being
exercised.

     2.2 Upon each exercise of the Holder's rights to purchase Warrant Shares,
the Holder shall be deemed to be the holder of record of the Warrant Shares
issuable upon such exercise, notwithstanding that the transfer books of the
Company shall then be closed or certificates representing such Warrant Shares
shall not then have been actually delivered to the Holder. As soon as
practicable after each such exercise of a Warrant, the Company shall issue and
deliver to the Holder a certificate or certificates for the Warrant Shares
issuable upon such exercise, registered in the name of the Holder or its
designee. If a Warrant should be exercised in part only, the Company shall, upon
surrender of the Warrant Certificate evidencing such Warrant for cancellation,
execute and deliver a new Warrant Certificate evidencing the right of the Holder
to purchase the balance of the Warrant Shares (or portions thereof) subject to
purchase hereunder.

<PAGE>

     2.3 The issuance of any shares or other securities upon the exercise of
Warrants and the delivery of certificates or other instruments representing such
shares or other securities shall be made without charge to the Holder for any
tax or other charge (other than payment of the Exercise Price) in respect of
such issuance. The Company shall not, however, be required to pay any tax that
may be payable in respect of any transfer involved in the issue and delivery of
any certificate in a name other than that of the Holder, and the Company shall
not be required to issue or deliver any such certificate unless and until the
person or persons requesting the issue thereof shall have paid to the Company
the amount of such tax or shall have established of the satisfaction of the
Company that such tax has been paid.

3. Adjustment of Exercise Price. Subject to the provisions of this Section 3,
the Exercise Price in effect from time to time shall be subject to adjustment as
follows:

     3.1 If the Company shall at any time after the date hereof (i) declare a
dividend on the outstanding Common Stock payable in shares of its Common Stock,
(ii) subdivide the outstanding Common Stock, (iii) combine the outstanding
Common Stock into a smaller number of shares, or (iv) issue any shares of its
Common Stock by reclassification in connection with a consolidation or merger in
which the Company is the continuing corporation, then, in each such case, the
Exercise Price in effect and the number of Warrant Shares issuable upon exercise
hereof at the time of the record date for such dividend or of the effective date
of such subdivision, combination or reclassification, shall be proportionately
adjusted so that the Holder hereof after such time shall be entitled to receive
upon exercise hereof the aggregate number and kind of shares that such Holder
would have owned upon exercise of this Warrant immediately before such time and
been entitled to receive by virtue of such dividend, subdivision, combination or
reclassification.

     3.2 If the Company shall distribute to all holders of Common Stock
(including any such distribution made to the shareholders of the Company in
connection with a consolidation or merger in which the Company is the continuing
corporation) (i) evidences of its indebtedness, cash or assets (other than
ordinary cash dividends paid out of the net profits of the Company for its most
recent fiscal year), (ii) rights, options or warrants to subscribe for or
purchase Common Stock, or (iii) any equity securities of the Company (other than
Common Stock), including any securities convertible into or exchangeable for
shares of Common Stock, then, in each case, the Exercise Price shall be adjusted
by multiplying the Exercise Price in effect immediately before the record date
for the determination of shareholders entitled to receive such distribution by a
fraction, the numerator of which shall be the Current Market Price (as
determined pursuant to Section 3.6 hereof) per share of Common Stock on such
record date, less the fair market value (as determined in good faith by the
board of directors of the Company, whose determination shall be conclusive
absent manifest error) of the portion of the evidences of indebtedness or assets
so to be distributed, or of such securities, rights, options, or warrants, or
the amount of such cash, applicable to one share, and the denominator of which
shall be such Current Market Price per share of Common Stock. Such adjustment
shall become effective at the close of business on such record date.

     3.3 In any case in which this Section 3 shall require that an adjustment in
the number of Warrant Shares be made effective as of a record date for a
specified event (an "Event"), the Company may elect to defer, until the
occurrence of such Event, issuing to the Holder, if the Holder exercised this
Warrant after such record date, the shares of Common Stock, if any, issuable
upon such exercise over and above the number of Warrant Shares, if any, issuable
upon such exercise on the basis of the number of Warrant Shares in effect prior
to such adjustment; provided, however, that the Company shall deliver to the
Holder a due bill or other appropriate instrument evidencing the Holder's right
to receive such additional shares upon the occurrence of the Event requiring
such adjustment.

     3.4 Whenever there shall be an adjustment as provided in this Section 3,
the Company shall within 15 days thereafter cause written notice thereof to be
sent by registered or certified mail, postage prepaid, to the Holder, at its
address as it shall appear in the Warrant Register, which notice shall be
accompanied by an officer's certificate setting forth the number of Warrant
Shares issuable hereunder and the Exercise Price thereof after such adjustment
and setting forth a brief statement of the facts requiring such adjustment and
the computation thereof, which officer's certificate shall be conclusive
evidence of the correctness of any such adjustment absent manifest error.

                                      -2-
<PAGE>

     3.5 All calculations under this Section 3 shall be made to the nearest cent
or to the nearest one-thousandth of a share, as the case may be. No adjustment
in the Exercise Price shall be required if such adjustment is less than $.05;
provided, however, that any adjustments that by reason of this Section 3.5 are
not required to be made shall be carried forward and taken into account in any
subsequent adjustment. The Company shall not be required to issue fractions of
shares of Common Stock or other capital stock of the Company upon the exercise
of Warrants. If any fraction of a share would be issuable on the exercise of
Warrants, the Company shall purchase such fraction for an amount in cash equal
to the same fraction of the Current Market Price (as hereinafter defined) of
such share of Common Stock on the date of exercise of the Warrants.

     3.6 The Current Market Price per share of Common Stock as of any date shall
be the average of the daily closing prices for the 20 consecutive trading days
immediately preceding the date in question. The closing price for each day shall
be the last reported sales price regular way or, in case no such reported sale
takes place on such day, the closing bid price regular way, in either case on
the principal national securities exchange (including, for purposes hereof, the
Nasdaq National Market) on which the Common Stock is listed or admitted to
trading or, if the Common Stock is not listed or admitted to trading on any
national securities exchange, the highest reported bid price of the Common Stock
as furnished by the National Association of Securities Dealers, Inc. through
Nasdaq, or a similar organization if Nasdaq is no longer reporting such
information. If on any such date the Common Stock is not listed or admitted to
trading on any national securities exchange and is not quoted by Nasdaq or any
similar organization, the fair value of a share of Common Stock on such date, as
determined in good faith by the board of directors of the Company, whose
determination shall be conclusive absent manifest error, shall be used.

4. Mergers; Reorganizations.

     4.1 In each case of a consolidation with or merger of the Company with or
into another corporation (other than a merger or consolidation in which the
Company is the surviving or continuing corporation and that does not result in
any reclassification of the outstanding shares of Common Stock or the conversion
of such outstanding shares of Common Stock into shares of other stock or other
securities or property), or in case of any sale, lease or conveyance to another
corporation of the property and assets of any nature of the Company as an
entirety or substantially as an entirety (such actions being hereinafter
collectively referred to as "Reorganizations"), there shall thereafter be
deliverable upon exercise of the Warrants (in lieu of the number of Warrant
Shares theretofore deliverable) the kind and amount of shares of stock or other
securities or property to which a holder of the number of Warrant Shares that
would otherwise have been deliverable upon the exercise hereof upon such
Reorganization if the Warrants had been exercised in full immediately before
such Reorganization. In case of any Reorganization, appropriate adjustment, as
determined in good faith by the Board of Directors of the Company, shall be made
in the application of the provisions herein set forth with respect to the rights
and interests of the Holder so that the provisions set forth herein shall
thereafter be applicable, as nearly as possible, in relation to any shares or
other property thereafter deliverable upon exercise of the Warrants. Any such
adjustment shall be made by and set forth in a supplemental agreement between
the Company, or any successor thereto, and the Holder and shall for all purposes
hereof conclusively be deemed to be an appropriate adjustment. The Company shall
not effect any such Reorganization unless upon or before the consummation
thereof the successor corporation or, if the Company shall be the surviving
corporation in any such Reorganization and is not the issuer of the shares of
stock or other securities or property to be delivered to holders of shares of
the Common Stock outstanding at the effective time thereof, then such issuer,
shall assume by written instrument the obligation to deliver to the Holder such
shares of stock, securities, cash or other property as the Holder shall be
entitled to purchase in accordance with the foregoing provisions.

     4.2 In each case of a reclassification or change of the shares of Common
Stock issuable upon exercise of the Warrants (other than a change in par value
or from no par value to a specified par value, or as a result of a subdivision
or combination, but including any change in the shares into two or more classes
or series of shares), an in each case of any consolidation or merger of another
corporation into the Company in which the Company is the continuing corporation
and in which there is a reclassification or change (including a change to the
right to receive cash or other property) of the shares of Common Stock (other
than a change in par value, or from no par value to a specified par value, or as
a result of a subdivision or combination, but including any change in the shares
into two or more classes or series of shares),


                                      -3-
<PAGE>

the Holder shall have the right thereafter to receive upon exercise of the
Warrants solely the kind and amount of shares of stock and other securities,
property, cash, or any combination thereof receivable upon such
reclassification, change, consolidation, or merger by a holder of the number of
shares of Common Stock for which the Warrants might have been exercised
immediately before such reclassification, change, consolidation, or merger.
Thereafter, appropriate provision shall be made for adjustments that shall be as
nearly equivalent as practicable to the adjustments required by Section 3.

5. Notice of Certain Events. In case at any time the Company shall propose:

          (a) to pay any dividend or make any distribution on shares of Common
Stock in shares of Common Stock or make any other distribution (other than
regularly scheduled cash dividends that are not in a greater amount per share
than the most recent such cash dividend) to all holders of Common Stock; or

          (b) to issue any rights, warrants or other securities to all holders
of Common Stock entitling them to purchase any additional shares of Common Stock
or any other rights, warrants or other securities; or

          (c) to effect any reclassification or change of outstanding shares of
Common Stock or any consolidation, merger, sale, lease or conveyance of property
described in Section 4; or

          (d) to effect any liquidation, dissolution or
winding-up of the Company;

then, and in any one or more of such cases, the Company shall give written
notice thereof by registered or certified mail, postage prepaid, to the Holder
at the Holder's address as it shall appear in the Warrant Register, mailed at
least 15 days before (i) the date as of which the holders of record of shares of
Common Stock to be entitled to receive any such dividend, distribution, rights,
warrants or other securities are to be determined or (ii) the date on which any
such reclassification, change of outstanding shares of Common Stock,
consolidation, merger, sale, lease, conveyance of property, liquidation,
dissolution or winding-up is expected to become effective and the date as of
which it is expected that holders of record of shares of Common Stock shall be
entitled to exchange their shares for securities or other property, if any,
deliverable upon such reclassification, change of outstanding shares,
consolidation, merger, sale, lease, conveyance of property, liquidation,
dissolution or winding-up.

6. Warrant Register; Transfers of Warrants.

     6.1 This Warrant Certificate and any new Warrant Certificate issued upon
the transfer or exercise in part of any Warrants shall be numbered and shall be
registered in a Warrant Register as it is issued. The Company shall be entitled
to treat the holder of this Warrant Certificate registered on the Warrant
Register as the owner in fact of the Warrants evidenced hereby for all purposes,
shall not be bound to recognize any equitable or other claim to or interest in
such Warrants on the part of any other person, and shall not be liable for any
registration or transfer of a Warrant Certificate that is registered or to be
registered in the name of a fiduciary or the nominee of a fiduciary unless made
with the actual knowledge that a fiduciary or nominee is committing a breach of
trust in requesting such registration or transfer, or with the knowledge of such
facts that its participation therein amounts to bad faith. Warrants shall be
transferable only in the Warrant Register upon delivery of the Warrant
Certificate evidencing such Warrants duly endorsed by the Holder or by his or
its duly authorized attorney or representative, or accompanied by proper
evidence of succession, assignment, or authority to transfer. In all cases of
transfer by an attorney, executor, administrator, guardian or other legal
representative, duly authenticated evidence of his or its authority shall be
produced.

     6.2 Upon any registration of transfer, the Company shall deliver to the
person entitled thereto a new Warrant Certificate of like tenor and evidencing
in the aggregate a like number of Warrants in exchange for this Warrant
Certificate, subject to the limitations provided herein. This Warrant
Certificate may be exchanged, at the option of the Holder hereof, for another
Warrant Certificate, or other Warrant Certificates of different denominations,
of like tenor and representing in the aggregate the right to purchase a like
number of Warrant Shares (or portions thereof), upon surrender to the Company or
its duly authorized agent. Notwithstanding the foregoing, the Company shall have
no obligation to cause Warrants to be transferred on its books to any person if,
in the reasonable opinion of counsel to the Company, such transfer does not
comply with the provisions of the


                                      -4-
<PAGE>

Securities Act of 1933, as amended (the "Act"), and the rules and regulations
thereunder, or with any other restrictions set forth herein.

     6.3 The Warrants and Warrant Shares shall be subject to a stop transfer
order and the certificate or certificates evidencing the Warrant Shares shall
bear the following legend:

"THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED, AND SUCH SHARES MAY NOT BE OFFERED OR SOLD
EXCEPT PURSUANT TO A REGISTRATION STATEMENT UNDER SUCH ACT OR AN OPINION OF
COUNSEL REASONABLY SATISFACTORY TO COUNSEL FOR THE ISSUER THAT AN EXEMPTION FROM
REGISTRATION UNDER SUCH ACT IS AVAILABLE."

7. Authorized Shares. The Company shall at all times reserve and keep available
out of its authorized and unissued Common Stock, solely for the purpose of
providing for the exercise of the Warrants, such number of shares of Common
Stock as shall, from time to time, be sufficient therefor. The Company covenants
that all shares of Common Stock issuable upon exercise of the Warrants shall,
upon receipt by the Company of the full payment therefor, be validly issued,
fully paid, nonassessable, and free of preemptive rights.

8. Redemption of Warrants. The Company may, at its option, upon not less than 30
days' nor more than 60 days' prior notice, call for redemption of all (but not
less than all) of the outstanding Warrants at a redemption price of $0.01 per
Warrant (the "Redemption Price"), effective on any date (the "Redemption Date")
on or after May 17, 1998, provided that the Current Market Price (as defined in
Section 3.6) as of any date before the Redemption Date has exceeded 150% of the
Exercise Price. The Warrants may be exercised until 5:00 p.m. Boston time on the
business day immediately preceding the Redemption Date. If any Warrant called
for redemption is not exercised before that time, such Warrant shall thereupon
cease to be exercisable. The Company will pay the Redemption Price to or as
directed by the Holder upon presentation and surrender of this Warrant
Certificate at its Main Office, or at such other place as may be designated in
writing by the Company.

9. Miscellaneous.

     9.1 Upon receipt of evidence satisfactory to the Company of the loss,
theft, destruction or mutilation of any Warrant Certificate (and upon surrender
of any Warrant Certificate if mutilated), upon issuance of an indemnity bond if
required by the Company, and upon reimbursement of the Company's incidental
expenses, the Company shall execute and deliver to the Holder hereof a new
Warrant Certificate of like date, tenor and denomination.

     9.2 The Holder hereof shall not have, solely on account of such status, any
rights of a stockholder of the Company, either at law or in equity, or to any
notice of meetings of stockholders or of any other proceedings of the Company,
except as provided herein.

     9.3 This Warrant Certificate and the Warrants shall be construed in
accordance with the laws of the State of Delaware applicable to contracts made
and performed within such State, without regard to principles of conflicts of
law.

                                      -5-
<PAGE>


IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to be duly
executed as an instrument under seal as of May 17, 1996.

PROCEPT, INC.


By: ________________________________
      Michael J. Higgins
      Vice President, Finance

Attest:

____________________________________
Secretary


                                      -6-
<PAGE>


                              FORM OF SUBSCRIPTION
                   (To be signed only on exercise of Warrant)

TO PROCEPT, INC.:

     The undersigned, the holder of the within Warrant, hereby irrevocably
elects to exercise this Warrant for, and to purchase thereunder, _______________
shares of Common Stock of Procept, Inc. and herewith makes payment of
$____________ therefor, and requests that the certificates for such shares be
issued in the name of, and delivered to
_____________________________________________________________________, whose
address is ______________________________________________________________.


Dated: __________
                              ..................................................
                              (Signature must conform to the name of holder as
                               specified on the face of the Warrant)

                              ..................................................
                              (Address)


                              --------------------

                               FORM OF ASSIGNMENT
                   (To be signed only on transfer of Warrant)


     For value received, the undersigned hereby sells, assigns, and transfers
unto __________________________________________ the right represented by the
within Warrant to purchase ______________________ shares of Common Stock of
Procept, Inc. to which the within Warrant relates, and appoints
___________________________________ attorney to transfer such right on the books
of Procept, Inc. with full power of substitution in the premises.


Dated: ___________
                              ..................................................
                              (Signature must conform to the name of holder as
                               specified on the face of the Warrant)

                              ..................................................
                              (Address)

<PAGE>


                                  PROCEPT, INC.

            SCHEDULE OF HOLDERS OF MAY 17, 1996 COMMON STOCK WARRANTS

Original Warrant Holder                                    Number of Underlying
                                                                Shares

Raymond J. Anton                                                 40,921
The Aries Trust                                                 286,446
Aries Domestic Fund                                             122,763
David P. Ash & Meredith C. Ash                                   81,842
Biotechnology Value Fund, L.P.                                  163,683
Jim Caudy                                                        20,461
Celestial Charitable Remainder Unitrust                         255,755
Frederick Chassman                                               20,461
Frank Chiarulli, M.D.                                            40,921
Judson Cooper                                                    40,921
Dartley Family Limited Partnership                               20,461
Jonathon T. Dawson                                               40,921
Nicholas DiFalco                                                 20,461
Ted Friedman & Eve Friedman, JTWROS                              81,842
William H. Fullerton III                                         20,461
David Gendal                                                     20,461
Robert H. Gurevitch                                              20,461
Thomas F. Hudak                                                  40,921
Investment 10 L.L.C.                                             34,783
Michael T. Jackson Trust                                         40,921
Michael G. Jesselson                                            204,604
Karfunkel Family Foundation                                     204,604
Scott Koppelman & Amy Koppelman                                  20,461
Paula Kramer                                                     10,231
Philip Landers                                                   20,461
John H. Livens                                                   20,461
Joseph D. McKeown                                                20,461
Morton & Zelda Michelson                                         20,461
Martin and Sandra Miller                                         10,231
John Murchison                                                   40,921
Tollef O. Nasby                                                  20,461
New York Life Insurance Company                                 613,811
Steven M. Oliveira                                               81,842
Amore Perpetilo Inc                                              81,842
Pequot Scout Fund LP                                            250,000
Pharma/Health Fund                                              409,208
Alexander Pomper                                                 40,921
Porridge Partners II                                             81,842
Evelyn Rickel Grantor Retirement Trust                           10,231


<PAGE>


Kenneth D. Rickel                                                20,461
Robert Rickel Grantor Retirement Income
Trust                                                            10,231
David M. Rozen                                                  169,059
Samaha Family Limited Partnership                                20,461
Joshua D. Schein & Eileen G. Schein                              40,921
Yvonne M. Schell                                                 10,231
Stanley K. Shapiro                                               20,461
Chaim Sieger                                                     57,290
Silvia Stambler Stern                                            10,231
Richard B. Stone                                                 40,921
Ronald Suster                                                    40,921
Stanley K.C. Tam, M.D.                                           73,658
James R. Tompkins                                                40,921
United Equities Company                                         102,302
Venturetek, L.P.                                                 81,842
Westfield Performance Fund                                      163,683
Lance M. Willsey                                                 20,461
WPG Institutional Life Sciences                                  81,842
  Fund, L.P.
WPG Life Sciences Fund, L.P.                                    122,763
Martin Zabel                                                     10,231
Robert Zelin                                                     20,462

Total                                                         4,738,274




THE WARRANTS REPRESENTED BY THIS CERTIFICATE AND THE OTHER SECURITIES ISSUABLE
UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED, AND MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO A REGISTRATION
STATEMENT UNDER SUCH ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO
COUNSEL FOR THE ISSUER THAT AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT IS
AVAILABLE. THE TRANSFER OR EXCHANGE OF THE WARRANTS REPRESENTED BY THIS
CERTIFICATE ARE FURTHER RESTRICTED AS DESCRIBED HEREIN.

                                  PROCEPT, INC.

                         Common Stock Purchase Warrants

                                  75,000 Shares

            EXERCISABLE UNTIL 5:00 P.M., BOSTON TIME, JANUARY 6, 2002

     This Warrant Certificate certifies that Furman Selz LLC or its registered
assigns, is the registered holder of Warrants to purchase initially up to 75,000
fully-paid and non-assessable shares (the "Warrant Shares") of common stock,
$0.01 par value ("Common Stock") of Procept, Inc., a Delaware corporation (the
"Company"), at any time from January 6, 1997 until 5:00 p.m. Boston time on
January 6, 2002 (the "Expiration Date"), unless sooner redeemed pursuant to
Section 8 hereof, at the initial exercise price (the "Exercise Price") of $1.50
per share of Common Stock, subject to the conditions set forth herein. The
number of Warrant Shares issuable hereunder and the Exercise Price are each
subject to adjustment as provided herein. No Warrant may be exercised after 5:00
p.m., Boston time, on the Expiration Date, after which time all Warrants
evidenced hereby, unless exercised prior thereto, shall be void.

1.  Certain Definitions. As used herein the following
terms, unless the context otherwise requires, have the
following respective meanings:

     1.1 The term "Company" shall include Procept, Inc. and any corporation that
shall succeed or assume the obligations of Procept, Inc. hereunder.

     1.2 The terms "Warrant" or "Warrants" mean these Warrants and any other
warrant or warrants issued in exchange or substitution for, or upon partial
exercise of, these Warrants.

     1.3 The term "Holder" means the registered holder(s) of this Warrant
Certificate.

2.   Exercise of Warrants.

     2.1 Warrants may be exercised by the Holder hereof, at any time until 5:00
p.m. Boston time on the Expiration Date or 5:00 p.m. Boston Time on the last
business day before the Redemption Date (as defined in Section 8), as the case
may be, as to the whole or any lesser number of the Warrant Shares covered
hereby, by the surrender of this Warrant Certificate (with the election at the
end hereof duly executed) to the Company at its main office at 840 Memorial
Drive, Cambridge, Massachusetts ("Main Office"), or at such other place as may
be designated in writing by the Company, together with a certified or bank check
payable to the order of the Company in an amount equal to the Exercise Price
multiplied by the number of Warrant Shares for which such Warrants are being
exercised.

     2.2 Upon each exercise of the Holder's rights to purchase Warrant Shares,
the Holder shall be deemed to be the holder of record of the Warrant Shares
issuable upon such exercise, notwithstanding that the transfer books of the
Company shall then be closed or certificates representing such Warrant Shares
shall not then have been actually delivered to the Holder. As soon as
practicable after each such exercise of a Warrant, the Company shall issue and
deliver to the Holder a certificate or certificates for the Warrant Shares
issuable upon such exercise, registered in the name of the Holder or its
designee. If a Warrant should be exercised in part only, the Company shall, upon
surrender of the Warrant Certificate evidencing such Warrant for cancellation,
execute and deliver a new Warrant Certificate evidencing the right of the

<PAGE>

Holder to purchase the balance of the Warrant Shares (or portions thereof)
subject to purchase hereunder.

     2.3 The issuance of any shares or other securities upon the exercise of
Warrants and the delivery of certificates or other instruments representing such
shares or other securities shall be made without charge to the Holder for any
tax or other charge (other than payment of the Exercise Price) in respect of
such issuance. The Company shall not, however, be required to pay any tax that
may be payable in respect of any transfer involved in the issue and delivery of
any certificate in a name other than that of the Holder, and the Company shall
not be required to issue or deliver any such certificate unless and until the
person or persons requesting the issue thereof shall have paid to the Company
the amount of such tax or shall have established to the satisfaction of the
Company that such tax has been paid.

3. Adjustment of Exercise Price. Subject to the provisions of this Section 3,
the Exercise Price in effect from time to time shall be subject to adjustment as
follows:

     3.1 If the Company shall at any time after the date hereof (i) declare a
dividend on the outstanding Common Stock payable in shares of its Common Stock,
(ii) subdivide the outstanding Common Stock, (iii) combine the outstanding
Common Stock into a smaller number of shares, or (iv) issue any shares of its
Common Stock by reclassification in connection with a consolidation or merger in
which the Company is the continuing corporation, then, in each such case, the
Exercise Price in effect and the number of Warrant Shares issuable upon exercise
hereof at the time of the record date for such dividend or of the effective date
of such subdivision, combination or reclassification, shall be proportionately
adjusted so that the Holder hereof after such time shall be entitled to receive
upon exercise hereof the aggregate number and kind of shares that such Holder
would have owned upon exercise of this Warrant immediately before such time and
been entitled to receive by virtue of such dividend, subdivision, combination or
reclassification.

     3.2 If the Company shall distribute to all holders of Common Stock
(including any such distribution made to the shareholders of the Company in
connection with a consolidation or merger in which the Company is the continuing
corporation) (i) evidences of its indebtedness, cash or assets (other than
ordinary cash dividends paid out of the net profits of the Company for its most
recent fiscal year), (ii) rights, options or warrants to subscribe for or
purchase Common Stock, or (iii) any equity securities of the Company (other than
Common Stock), including any securities convertible into or exchangeable for
shares of Common Stock, then, in each case, the Exercise Price shall be adjusted
by multiplying the Exercise Price in effect immediately before the record date
for the determination of shareholders entitled to receive such distribution by a
fraction, the numerator of which shall be the Current Market Price (as
determined pursuant to Section 3.6 hereof) per share of Common Stock on such
record date, less the fair market value (as determined in good faith by the
Board of Directors of the Company, whose determination shall be conclusive
absent manifest error) of the portion of the evidences of indebtedness or assets
so to be distributed, or of such securities, rights, options, or warrants, or
the amount of such cash, applicable to one share, and the denominator of which
shall be such Current Market Price per share of Common Stock. Such adjustment
shall become effective at the close of business on such record date.

     3.3 In any case in which this Section 3 shall require that an adjustment in
the number of Warrant Shares be made effective as of a record date for a
specified event (an "Event"), the Company may elect to defer, until the
occurrence of such Event, issuing to the Holder, if the Holder exercised this
Warrant after such record date, the shares of Common Stock, if any, issuable
upon such exercise over and above the number of Warrant Shares, if any, issuable
upon such exercise on the basis of the number of Warrant Shares in effect prior
to such adjustment; provided, however, that the Company shall deliver to the
Holder a due bill or other appropriate instrument evidencing the Holder's right
to receive such additional shares upon the occurrence of the Event requiring
such adjustment.

     3.4 Whenever there shall be an adjustment as provided in this Section 3,
the Company shall within 15 days thereafter cause written notice thereof to be
sent by registered or certified mail, postage prepaid, to the Holder, at its
address as it shall appear in the Warrant Register, which notice shall be
accompanied by an officer's certificate setting forth the number of Warrant
Shares issuable hereunder and the Exercise Price thereof after such adjustment
and setting forth a brief statement of the facts requiring such adjustment and
the computation thereof, which officer's certificate shall be conclusive
evidence of


                                      -2-
<PAGE>

the correctness of any such adjustment absent manifest error.

     3.5 All calculations under this Section 3 shall be made to the nearest cent
or to the nearest one-thousandth of a share, as the case may be. No adjustment
in the Exercise Price shall be required if such adjustment is less than $0.05;
provided, however, that any adjustments that by reason of this Section 3.5 are
not required to be made shall be carried forward and taken into account in any
subsequent adjustment. The Company shall not be required to issue fractions of
shares of Common Stock or other capital stock of the Company upon the exercise
of Warrants. If any fraction of a share would be issuable on the exercise of
Warrants, the Company shall purchase such fraction for an amount in cash equal
to the same fraction of the Current Market Price (as hereinafter defined) of
such share of Common Stock on the date of exercise of the Warrants.

     3.6 The Current Market Price per share of Common Stock as of any date shall
be the average of the daily closing prices for the 20 consecutive trading days
immediately preceding the date in question. The closing price for each day shall
be the last reported sales price regular way or, in case no such reported sale
takes place on such day, the closing bid price regular way, in either case on
the principal national securities exchange (including, for purposes hereof, the
Nasdaq National Market) on which the Common Stock is listed or admitted to
trading or, if the Common Stock is not listed or admitted to trading on any
national securities exchange, the highest reported bid price of the Common Stock
as furnished by the National Association of Securities Dealers, Inc. through
Nasdaq, or a similar organization if Nasdaq is no longer reporting such
information. If on any such date the Common Stock is not listed or admitted to
trading on any national securities exchange and is not quoted by Nasdaq or any
similar organization, the fair value of a share of Common Stock on such date, as
determined in good faith by the Board of Directors of the Company, whose
determination shall be conclusive absent manifest error, shall be used.

4.   Mergers; Reorganizations.

     4.1 In each case of a consolidation with or merger of the Company with or
into another corporation (other than a merger or consolidation in which the
Company is the surviving or continuing corporation and that does not result in
any reclassification of the outstanding shares of Common Stock or the conversion
of such outstanding shares of Common Stock into shares of other stock or other
securities or property), or in case of any sale, lease or conveyance to another
corporation of the property and assets of any nature of the Company as an
entirety or substantially as an entirety (such actions being hereinafter
collectively referred to as "Reorganizations"), there shall thereafter be
deliverable upon exercise of the Warrants (in lieu of the number of Warrant
Shares theretofore deliverable) the kind and amount of shares of stock or other
securities or property to which a holder of the number of Warrant Shares that
would otherwise have been deliverable upon the exercise hereof upon such
Reorganization if the Warrants had been exercised in full immediately before
such Reorganization. In case of any Reorganization, appropriate adjustment, as
determined in good faith by the Board of Directors of the Company, shall be made
in the application of the provisions herein set forth with respect to the rights
and interests of the Holder so that the provisions set forth herein shall
thereafter be applicable, as nearly as possible, in relation to any shares or
other property thereafter deliverable upon exercise of the Warrants. Any such
adjustment shall be made by and set forth in a supplemental agreement between
the Company, or any successor thereto, and the Holder and shall for all purposes
hereof conclusively be deemed to be an appropriate adjustment. The Company shall
not effect any such Reorganization unless upon or before the consummation
thereof the successor corporation or, if the Company shall be the surviving
corporation in any such Reorganization and is not the issuer of the shares of
stock or other securities or property to be delivered to holders of shares of
the Common Stock outstanding at the effective time thereof, then such issuer,
shall assume by written instrument the obligation to deliver to the Holder such
shares of stock, securities, cash or other property as the Holder shall be
entitled to purchase in accordance with the foregoing provisions.

     4.2 In each case of a reclassification or change of the shares of Common
Stock issuable upon exercise of the Warrants (other than a change in par value
or from no par value to a specified par value, or as a result of a subdivision
or combination, but including any change in the shares into two or more classes
or series of shares), and in each case of any consolidation or merger of another
corporation into the Company in which the Company is the continuing corporation
and in which there is a reclassification or change (including a change to the
right to receive cash or other property) of the shares of Common


                                      -3-
<PAGE>

Stock (other than a change in par value, or from no par value to a specified par
value, or as a result of a subdivision or combination, but including any change
in the shares into two or more classes or series of shares), the Holder shall
have the right thereafter to receive upon exercise of the Warrants solely the
kind and amount of shares of stock and other securities, property, cash, or any
combination thereof receivable upon such reclassification, change,
consolidation, or merger by a holder of the number of shares of Common Stock for
which the Warrants might have been exercised immediately before such
reclassification, change, consolidation, or merger. Thereafter, appropriate
provision shall be made for adjustments that shall be as nearly equivalent as
practicable to the adjustments required by Section 3.

5.   Notice of Certain Events.  In case at any time the
Company shall propose:

          (a) to pay any dividend or make any distribution on shares of Common
Stock in shares of Common Stock or make any other distribution (other than
regularly scheduled cash dividends that are not in a greater amount per share
than the most recent such cash dividend) to all holders of Common Stock; or

          (b) to issue any rights, warrants or other securities to all holders
of Common Stock entitling them to purchase any additional shares of Common Stock
or any other rights, warrants or other securities; or

          (c) to effect any reclassification or change of outstanding shares of
Common Stock or any consolidation, merger, sale, lease or conveyance of property
described in Section 4; or

          (d) to effect any liquidation, dissolution or
winding-up of the Company;

then, and in any one or more of such cases, the Company shall give written
notice thereof by registered or certified mail, postage prepaid, to the Holder
at the Holder's address as it shall appear in the Warrant Register, mailed at
least 15 days before (i) the date as of which the holders of record of shares of
Common Stock to be entitled to receive any such dividend, distribution, rights,
warrants or other securities are to be determined or (ii) the date on which any
such reclassification, change of outstanding shares of Common Stock,
consolidation, merger, sale, lease, conveyance of property, liquidation,
dissolution or winding-up is expected to become effective and the date as of
which it is expected that holders of record of shares of Common Stock shall be
entitled to exchange their shares for securities or other property, if any,
deliverable upon such reclassification, change of outstanding shares,
consolidation, merger, sale, lease, conveyance of property, liquidation,
dissolution or winding-up.

6.   Warrant Register; Transfers of Warrants.

     6.1 This Warrant Certificate and any new Warrant Certificate issued upon
the transfer or exercise in part of any Warrants shall be numbered and shall be
registered in a Warrant Register as it is issued. The Company shall be entitled
to treat the holder of this Warrant Certificate registered on the Warrant
Register as the owner in fact of the Warrants evidenced hereby for all purposes,
shall not be bound to recognize any equitable or other claim to or interest in
such Warrants on the part of any other person, and shall not be liable for any
registration or transfer of a Warrant Certificate that is registered or to be
registered in the name of a fiduciary or the nominee of a fiduciary unless made
with the actual knowledge that a fiduciary or nominee is committing a breach of
trust in requesting such registration or transfer, or with the knowledge of such
facts that its participation therein amounts to bad faith. Warrants shall be
transferable only in the Warrant Register upon delivery of the Warrant
Certificate evidencing such Warrants duly endorsed by the Holder or by his or
its duly authorized attorney or representative, or accompanied by proper
evidence of succession, assignment, or authority to transfer. In all cases of
transfer by an attorney, executor, administrator, guardian or other legal
representative, duly authenticated evidence of his or its authority shall be
produced.

     6.2 Upon any registration of transfer, the Company shall deliver to the
person entitled thereto a new Warrant Certificate of like tenor and evidencing
in the aggregate a like number of Warrants in exchange for this Warrant
Certificate, subject to the limitations provided herein. This Warrant
Certificate may be exchanged, at the option of the Holder hereof, for another
Warrant Certificate, or other Warrant Certificates of different denominations,
of like tenor and representing in the aggregate the right to purchase a like
number of Warrant Shares (or portions thereof), upon surrender to the Company or
its duly authorized agent. Notwithstanding the foregoing, the Company shall


                                      -4-
<PAGE>

have no obligation to cause Warrants to be transferred on its books to any
person if, in the reasonable opinion of counsel to the Company, such transfer
does not comply with the provisions of the Securities Act of 1933, as amended
(the "Act"), and the rules and regulations thereunder, or with any other
restrictions set forth herein.

     6.3 The Warrants and Warrant Shares shall be subject to a stop transfer
order and the certificate or certificates evidencing the Warrant Shares shall
bear the following legend:

"THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED, AND SUCH SHARES MAY NOT BE OFFERED OR SOLD
EXCEPT PURSUANT TO A REGISTRATION STATEMENT UNDER SUCH ACT OR AN OPINION OF
COUNSEL REASONABLY SATISFACTORY TO COUNSEL FOR THE ISSUER THAT AN EXEMPTION FROM
REGISTRATION UNDER SUCH ACT IS AVAILABLE."

7. Authorized Shares. The Company shall at all times reserve and keep available
out of its authorized and unissued Common Stock, solely for the purpose of
providing for the exercise of the Warrants, such number of shares of Common
Stock as shall, from time to time, be sufficient therefor. The Company covenants
that all shares of Common Stock issuable upon exercise of the Warrants shall,
upon receipt by the Company of the full payment therefor, be validly issued,
fully paid, nonassessable, and free of preemptive rights.

8. Redemption of Warrants. The Company may, at its option, on 10 days' prior
written notice, call for redemption of all (but not less than all) of the
outstanding Warrants for an aggregate price of $37,500 (the "Redemption Price"),
effective on any date (the "Redemption Date") on or after January 6, 1997, but
in no event later than October 6, 1997. The Warrants may be exercised until 5:00
p.m. Boston time on the business day immediately preceding the Redemption Date.
If any Warrant called for redemption is not exercised before that time, such
Warrant shall thereupon cease to be exercisable. The Company will pay the
Redemption Price to or as directed by the Holder upon presentation and surrender
of this Warrant Certificate at its Main Office, or at such other place as may be
designated in writing by the Company.

9.   Miscellaneous.

     9.1 Upon receipt of evidence satisfactory to the Company of the loss,
theft, destruction or mutilation of any Warrant Certificate (and upon surrender
of any Warrant Certificate if mutilated), upon issuance of an indemnity bond if
required by the Company, and upon reimbursement of the Company's incidental
expenses, the Company shall execute and deliver to the Holder hereof a new
Warrant Certificate of like date, tenor and denomination.

     9.2 The Holder hereof shall not have, solely on account of such status, any
rights of a stockholder of the Company, either at law or in equity, or to any
notice of meetings of stockholders or of any other proceedings of the Company,
except as provided herein.

     9.3 This Warrant Certificate and the Warrants shall be construed in
accordance with the laws of the State of Delaware applicable to contracts made
and performed within such State, without regard to principles of conflicts of
law.


IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to be duly
executed as an instrument under seal as of January 6, 1997

PROCEPT, INC.


By: /s/ Michael J. Higgins
- --------------------------
        Michael J. Higgins
         Vice President, Finance

Attest:

     /s/ Lynnette C. Fallon
     ----------------------
         Assistant Secretary

                                      -5-
<PAGE>


                              FORM OF SUBSCRIPTION
                   (To be signed only on exercise of Warrant)

TO PROCEPT, INC.:

     The undersigned, the holder of the within Warrant, hereby irrevocably
elects to exercise this Warrant for, and to purchase thereunder, _______________
shares of Common Stock of Procept, Inc. and herewith makes payment of
$____________ therefor, and requests that the certificates for such shares be
issued in the name of, and delivered to
_____________________________________________________________________, whose
address is ______________________________________________________________.


Dated: __________
                              .................................................
                              (Signature must conform to the name of holder as
                              specified on the face ofthe Warrant)

                              .................................................
                              (Address)


                              --------------------

                               FORM OF ASSIGNMENT
                   (To be signed only on transfer of Warrant)


     For value received, the undersigned hereby sells, assigns, and transfers
unto __________________________________________ the right represented by the
within Warrant to purchase ______________________ shares of Common Stock of
Procept, Inc. to which the within Warrant relates, and appoints
___________________________________ attorney to transfer such right on the books
of Procept, Inc. with full power of substitution in the premises.


Dated: ___________
                              ..................................................
                              (Signature must conform to name of the holder as
                              specified on the face of the Warrant)

                              ..................................................
                              (Address)




                          REGISTRATION RIGHTS AGREEMENT


           REGISTRATION RIGHTS AGREEMENT, dated as of January 6, 1997, between
Procept, Inc., a Delaware corporation (the "Company"), and Furman Selz LLC
(together with its permitted assignees, the "Holders").

                               W I T N E S S E T H

           WHEREAS, the Company has issued to the Holders warrants (the
"Warrants") to purchase shares of the common stock, $0.01 par value per share
(the "Common Stock"), of the Company (the "Warrant Shares");

           NOW, THEREFORE, in consideration of the premises and the agreements
herein set forth, and for other good and valuable consideration, the receipt and
legal sufficiency of which are hereby acknowledged, the parties agree as
follows:

            1. Grant of Rights.

               1.1. Demand Registration Rights.

                    1.1.1. Filing of Registration Statement. Upon the receipt of
demand from the Holders of a majority of the total number of Registrable Shares
(as defined below), requesting registration of Registrable Shares, then not
later than 60 days after the date of such demand, the Company shall prepare and
file with the Securities and Exchange Commission (the "Commission") a
Registration Statement on Form S-8 or Form S-3 sufficient to permit the public
offering and sale of the Registrable Shares requested to be registered (together
with additional Registrable Shares for which registration is requested under
Section 1.1.2) through all securities exchanges and over-the-counter markets on
which the Common Stock is then traded. For the purposes of this Agreement
"Registrable Shares" shall mean Warrant Shares outstanding or issuable upon the
exercise of the Warrants and any such outstanding Warrant Shares or issuable
Warrant Shares that either (i) are not at that time the subject of an effective
registration statement filed with the Commission or previously sold pursuant to
such a registration statement, (ii) are not eligible for sale under the
provisions of the Commission's Rule 144 without regard to volume limitations, or
(iii) have not been previously sold in compliance with Rule 144.

                    1.1.2. Notice of Filing of Registration Statement. In the
event the Company receives a demand to file a registration pursuant to Section
1.1.1, the Company shall notify each Holder not named in the demand of the
proposed filing and request that each Holder notify the Company within 15 days
thereafter of the number of Registrable Shares such Holder wishes the Company to
register on such Holder's behalf. Each Holder shall, prior to the end of such 15
day period, request in writing that the Company register the sale of all or part
of such Holder's Registrable Shares, or such Holder shall lose the right to
participate in the registration under Section 1.1.1.



<PAGE>



               1.2. Piggyback Registration Rights.

                    1.2.1. Offer to Include Registrable Shares in Company
Offering. If, at any time when Registrable Shares are outstanding, the Company
shall file a registration statement (other than on Form S-4, Form S-8, or any
successor form) to register shares of Common Stock for its own account with the
Commission, the Company shall give all the Holders at least 45 days' prior
written notice of the filing of such registration statement. Subject to Section
1.2.2 below, if requested by any Holder in writing within 30 days after receipt
of any such notice, the Company shall register or qualify all or, at each
Holder's option, any portion of the Registrable Shares of any Holders who shall
have made such request, concurrently with the registration of such other
securities, all to the extent requisite to permit the public offering and sale
of the Registrable Shares through the facilities of all appropriate securities
exchanges and the over-the-counter market, and will use its best efforts through
its officers, directors, auditors, and counsel to cause such registration
statement to become effective as promptly as practicable.

                    1.2.2. Cutback of Participation in Company Offering.
Notwithstanding Section 1.2.1 above, if the managing underwriter of any such
offering shall advise the Company in writing that, in its opinion, the
distribution of all or a portion of the Registrable Shares requested to be
included in the registration concurrently with the securities being registered
by the Company would materially adversely affect the distribution of such
securities by the Company for its own account, then the number of Registrable
Shares held by such Holder to be included in such registration statement shall
be reduced to the extent advised by such managing underwriter, provided that any
such reduction shall be made pro rata among the Holders electing to participate
in such registration based on the aggregate number of Registrable Shares held by
each Holder electing to so participate.

               1.3. Underwriting.

                    1.3.1. Underwriting in Secondary Registration. If the
Company undertakes a registration under Section 1.1, any Holder wishing to
distribute the Registrable Shares which such Holder has requested to be
registered in such registration by means of an underwriting, such Holder shall
so advise the Company in such Holder's request to participate in such
registration under Sections 1.1.1 or 1.1.2. The Holders of a majority of the
Registrable Shares being offered may select one or more underwriters for the
registration under Section 1.1, which selection shall be approved by the
Company, which approval shall not be unreasonably withheld provided such
underwriter(s) are experienced and reputable. The Company shall, together with
the Holders engaged in the registration hereunder, enter into an underwriting
agreement with the representative of the underwriter or underwriters selected
for such underwriting in accordance with this Section 1.3.1.


                    1.3.2. Underwriting in Piggyback Registration. In the event
of an underwritten registration pursuant to the provisions of Section 1.2, any
Holder who requests

                                      - 2 -

<PAGE>



to have Registrable Shares included in such registration shall enter into such
custody agreements and powers of attorney as are reasonably requested by the
Company and any such underwriter, and, if requested, enter into an underwriting
agreement containing customary terms.

                    1.3.3. Right of Withdrawal from Underwriting. In the event
of an underwritten offering under Section 1.3.1 or 1.3.2, the right of a Holder
to participate in a registration hereunder shall be conditioned upon the
inclusion of such Holder's Registrable Shares in such underwriting. If a Holder
disapproves of the terms of the underwriting, such Holder may elect to withdraw
therefrom by written notice to the Company and the underwriter delivered at
least seven days prior to the effective date of the Registration Statement. The
securities so withdrawn shall also be withdrawn from the Registration Statement.

               1.4. Effectiveness and Expenses. The Company will use its best
efforts through its officers, directors, auditors and counsel to cause any
Registration Statement filed pursuant to this Section 1 to become effective as
promptly as practicable. The Company shall be obligated to use its best efforts
to maintain the effectiveness of such Registration Statement only until the date
on which no Registrable Shares remain outstanding (the "Registration Termination
Date"). The Company shall be obligated to pay all expenses (other than the fees
and disbursements of counsel for the Holders and underwriting discounts, if any,
payable in respect of the Registrable Shares sold by the Holders) in connection
with any such registration statement.

               1.5. Blue Sky Registrations. In the event of a registration
pursuant to the provisions of this Section 1, the Company shall use its best
efforts to cause the Registrable Shares so registered to be registered or
qualified for sale under the securities or blue sky laws of such jurisdictions
as the Holders may reasonably request; provided, however, that the Company shall
not be required to qualify to do business in any state by reason of this Section
1.5 in which it is not otherwise required to qualify to do business.

               1.6. Continuing Effectiveness. Until the Registration Termination
Date, the Company shall use its best efforts to keep effective any registration
or qualification contemplated by this Section 1 and shall from time to time
amend or supplement each applicable registration statement, preliminary
prospectus, final prospectus, application, document and communication for such
period of time as shall be required to permit the Holders to complete the offer
and sale of the Registrable Shares covered thereby.

               1.7. Copies of Registration Statement and Related Documents. In
the event of a registration pursuant to the provisions of this Section 1, the
Company shall furnish to each Holder a copy of the Registration Statement and of
each amendment and supplement thereto (in each case, including all exhibits),
and a reasonable number of copies of each prospectus contained in such
registration statement and each supplement or amendment thereto (including each
preliminary prospectus), all of which shall conform to the

                                      - 3 -

<PAGE>



requirements of the Securities Act of 1933, as amended (the "Securities Act"),
and the rules and regulations thereunder, and such other documents, as any
Holder may reasonably request to facilitate the disposition of the Registrable
Shares included in such registration.

               1.8. Rule 144 Eligibility. The Company agrees that until all the
Registrable Shares have been sold under a registration statement or pursuant to
Rule 144 under the Securities Act, the Company shall use its best efforts to
keep current in filing all reports, statements and other materials required to
be filed with the Commission to permit holders of the Registrable Shares to sell
such securities under Rule 144.

            2. Indemnity.

               2.1. Company Indemnification of the Holders. Subject to the
conditions set forth below, the Company agrees to indemnify and hold harmless
each Holder, its officers, directors, partners, employees, agents and counsel,
and each person, if any, who controls any such person within the meaning of
Section 15 of the Securities Act or Section 20(a) of the Securities Exchange Act
of 1934, as amended (the "Exchange Act"), from and against any and all loss,
liability, charge, claim, damage and expense whatsoever (which shall include,
for all purposes of this Section 2, without limitation, attorneys' fees and any
and all expenses whatsoever incurred in investigating, preparing or defending
against any litigation, commenced or threatened, or any claim whatsoever, and
any and all amounts paid in settlement of any claim or litigation), as and when
incurred, arising out of, based upon, or in connection with any untrue statement
or alleged untrue statement of a material fact contained in any registration
statement, preliminary prospectus or final prospectus (as from time to time
amended and supplemented), or any amendment or supplement thereto, relating to
the sale of any of the Registrable Shares; or any omission or alleged omission
to state a material fact required to be stated therein or necessary to make the
statements therein not misleading, unless such statement or omission was made in
reliance upon and in conformity with written information furnished to the
Company with respect to such Holder by or on behalf of such person expressly for
inclusion in any registration statement, preliminary prospectus, or final
prospectus, or any amendment or supplement thereto, as the case may be. The
foregoing agreement to indemnify shall be in addition to any liability the
Company may otherwise have, including liabilities arising under this Agreement.

           If any action is brought against any Holder or any of its officers,
directors, partners, employees, agents or counsel, or any controlling persons of
such person (an "Indemnified Party") in respect of which indemnity may be sought
against the Company pursuant to the foregoing paragraph, such Indemnified Party
or Parties shall promptly notify the Company in writing of the institution of
such action (but the failure so to notify shall not relieve the Company from any
liability other than pursuant to this Section 2.1) and the Company shall
promptly assume the defense of such action, including the employment of counsel
(reasonably satisfactory to such Indemnified Party or Parties) and payment of
expenses. Such Indemnified Party or Parties shall have the right to employ its
or their own counsel in any such case, but the fees and expenses of such counsel
shall be at the expense of such

                                      - 4 -

<PAGE>



Indemnified Party or Parties unless the employment of such counsel shall have
been authorized in writing by the Company in connection with the defense of such
action or the Company shall not have promptly employed counsel reasonably
satisfactory to such Indemnified Party or Parties to have charge of the defense
of such action or such Indemnified Party or Parties shall have reasonably
concluded that there may be one or more legal defenses available to it or them
or to other indemnified parties which are different from or additional to those
available to the Company, in any of which events such fees and expenses shall be
borne by the Company, and the Company shall not have the right to direct the
defense of such action on behalf of the Indemnified Party or Parties. Anything
in this Section 2 to the contrary notwithstanding, the Company shall not be
liable for any settlement of any such claim or action effected without its
written consent, which shall not be unreasonably withheld. The Company shall
not, without the prior written consent of each Indemnified Party that is not
released as described in this sentence, settle or compromise any action, or
permit a default or consent to the entry of judgment in or otherwise seek to
terminate any pending or threatened action, in respect of which indemnity may be
sought hereunder (whether or not any Indemnified Party is a party thereto),
unless such settlement, compromise, consent or termination includes an
unconditional release of each Indemnified Party from all liability in respect of
such action. The Company agrees promptly to notify the Holders of the
commencement of any litigation or proceedings against the Company or any of its
officers or directors in connection with the sale of any Registrable Shares or
any preliminary prospectus, prospectus, registration statement or amendment or
supplement thereto, or any application relating to any sale of any Registrable
Shares.

               2.2. Holder Indemnification of the Company. Each Holder
participating in any such registration shall indemnify and hold harmless the
Company, each director of the Company, each officer of the Company who shall
have signed the registration statement covering Registrable Shares held by the
Holder, each other person, if any, who controls the Company within the meaning
of Section 15 of the Securities Act or Section 20(a) of the Exchange Act, and
its or their respective counsel, to the same extent as the foregoing indemnity
from the Company to the Holders in Section 2.1, but only with respect to
statements or omissions, if any, made in any registration statement, preliminary
prospectus or final prospectus or any amendment or supplement thereto, or in any
application, in reliance upon and in conformity with written information
furnished to the Company with respect to such Holder by or on behalf of such
Holder expressly for inclusion in any such registration statement, preliminary
prospectus or final prospectus (as from time to time amended and supplemented),
or any amendment or supplement thereto, or in any application, as the case may
be. If any action shall be brought against the Company or any other person so
indemnified based on any such registration statement, preliminary prospectus or
final prospectus, or any amendment or supplement thereto, or in any application,
and in respect of which indemnity may be sought against such Holder pursuant to
this Section 2.2, such Holder shall have the rights and duties given to the
Company and the Company and each other person so indemnified shall have the
rights and duties given to the indemnified parties, by the provisions of Section
2.1.


                                      - 5 -

<PAGE>



               2.3. Contribution. To provide for just and equitable
contribution, if (i) an Indemnified Party makes a claim for indemnification
pursuant to Section 2.1 or 2.2 (subject to the limitations thereof) but it is
found in a final judicial determination, not subject to further appeal, that
such indemnification may not be enforced in such case, even though this
Agreement expressly provides for indemnification in such case, or (ii) any
indemnified or indemnifying party seeks contribution under the Securities Act,
the Exchange Act or otherwise, then the Company (including for this purpose any
contribution made by or on behalf of any director of the Company, any officer of
the Company who signed any such registration statement, any controlling person
of the Company, and its or their respective counsel), as one entity, and the
Holders of the Registrable Shares included in such registration in the aggregate
(including for this purpose any contribution by or on behalf of an Indemnified
Party), as a second entity, shall contribute to the losses, liabilities, claims,
damages and expenses whatsoever to which any of them may be subject, on the
basis of relevant equitable considerations such as the relative fault of the
Company and such Holders in connection with the facts which resulted in such
losses, liabilities, claims, damages and expenses. The relative fault, in the
case of an untrue statement, alleged untrue statement, omission or alleged
omission, shall be determined by, among other things, whether such statement,
alleged statement, omission or alleged omission relates to information supplied
by the Company or by such Holders, and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such statement,
alleged statement, omission or alleged omission. The Company and the Holder
agree that it would be unjust and inequitable if the respective obligations of
the Company and the Holders for the contribution were determined by pro rata or
per capita allocation of the aggregate losses, liabilities, claims, damages and
expenses (even if the Holder and the other indemnified parties were treated as
one entity for such purpose) or by any other method of allocation that does not
reflect the equitable considerations, referred to in this Section 2.3. In no
case shall any Holder be responsible for a portion of the contribution
obligation imposed on all Holders in excess of its pro rata share based on the
number of Registrable Shares owned by it and included in such registration as
compared to the number of Registrable Shares owned by all Holders and included
in such registration. No person guilty of a fraudulent misrepresentation (within
the meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who is not guilty of such fraudulent
misrepresentation. For purposes of this Section 2.3, each person, if any, who
controls any Holder within the meaning of Section 15 of the Securities Act or
Section 20(a) of the Exchange Act and each officer, director, partner, employee,
agent and counsel of each such Holder or control person shall have the same
rights to contribution as such Holder or control person and each person, if any,
who controls the Company within the meaning of Section 15 of the Securities Act
or Section 20(a) of the Exchange Act, each officer of the Company who shall have
signed any such registration statement, each director of the Company and its or
their respective counsel shall have the same right to contribution as the
Company, subject in each case to the provisions of this Section 2.3. Anything in
this Section 2.3 to the contrary notwithstanding, no party shall be liable for
contribution with respect to the settlement of any claim or action effected
without its written consent. This Section 2.3 is intended to supersede any right
to contribution under the Securities Act, the Exchange Act or otherwise.

                                      - 6 -

<PAGE>




            3. Miscellaneous.

               3.1. Termination. This Agreement shall terminate on the date on
which there are no Registrable Shares outstanding.

               3.2. Governing Law. This Agreement shall be governed in all
respects by the laws of the Commonwealth of Massachusetts without giving effect
to principles of conflicts of law thereunder. It is acknowledged that it will be
impossible to measure in money the damages that would be suffered if the parties
fail to comply with any of the obligations imposed on them by this Agreement and
that in the event of any such failure an aggrieved party will be irreparably
damaged and will not have an adequate remedy at law. Any such party shall,
therefore, be entitled to injunctive relief and/or specific performance to
enforce such obligations, and if any action should be brought in equity to
enforce any of the provisions of this Agreement, none of the parties hereto
shall raise the defense that there is an adequate remedy at law.

               3.3. Successors and Assigns. Except as otherwise expressly
provided in this Agreement, the provisions of this Agreement shall inure to the
benefit of, and be binding upon, the successors, heirs, executors and
administrators of the parties; provided, however, (i) the Holder may not assign
its rights hereunder other than to a Holder of Registrable Shares; and (ii) the
Company may not assign its rights or delegate its duties under this Agreement.
The assignment of a Warrant or the transfer of Registrable Shares in a private
transaction shall be deemed to be an assignment of the rights of a Holder
hereunder with respect to the Registrable Shares.

               3.4. Entire Agreement; Amendment and Waiver. This Agreement
constitutes the full and entire understanding and agreement between the parties
with regard to the subject matter hereof. Neither this Agreement nor any term
hereof may be amended, discharged or terminated, except by a written instrument
signed by the Company and the holders of fifty percent (50%) or more of the
Registrable Shares; provided, however, that the effect of any such amendment
will be such that all of the Holders will be treated equally. Any provision of
this Agreement may be waived with respect to rights of any Holder by a written
instrument executed by the holders of fifty percent (50%) or more of the
Registrable Shares; provided, however, that the effect of such waiver shall be
such that all of the Holders will be treated equally.

               3.5. Notices. All notices and other communications required or
permitted under this Agreement shall be in writing and shall be deemed
effectively given upon personal delivery, upon delivery by a nationally
recognized overnight courier service, or upon deposit with the United States
Post Office, by registered or certified mail, postage prepaid, addressed to the
Company at 840 Memorial Drive, Cambridge, Massachusetts 02139 and to a Holder at
his or its address set forth in the records of the Company or at such other
address as any party may designate by ten days' prior written notice to the
other parties.


                                      - 7 -

<PAGE>


               3.6. Delays or Omissions. No delay or omission to exercise any
right, power or remedy accruing to any party upon any breach or default of
another party under this Agreement shall impair any such right, power or remedy
of such non-defaulting party nor shall it be construed to be a waiver of any
such breach or default, or an acquiescence therein, or in any similar breach or
default occurring thereafter; nor shall any waiver of any single breach or
default be deemed a waiver of any other breach or default theretofore or
thereafter occurring. Any waiver, permit, consent or approval of any kind or
character on the part of any holder of any breach or default under this
Agreement, or any waiver on the part of any party of any provisions or
conditions of this Agreement, must be made in writing and shall be effective
only to the extent specifically set forth in such writing. All remedies, either
under this Agreement or by law or otherwise afforded to any party, shall be
cumulative and not alternative.

               3.7. Rights; Separability. Unless otherwise expressly provided in
this Agreement, each Holder's rights are several rights, not rights jointly held
with any of the other Holders. In case any provision of this Agreement shall be
held to be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

               3.8. Titles. The titles of the Sections of this Agreement are for
convenience of reference only and are not to be considered in construing this
Agreement.

               3.9. Counterparts. This Agreement may be executed in any number
of counterparts, each of which shall be an original, but all of which together
shall constitute one Agreement.

            IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed, as of the day and year first above written.

                                         PROCEPT, INC.


                                         By:  /s/ Michael J. Higgins
                                         ---------------------------
                                                  Michael J. Higgins
                                                  Vice President, Finance

                                         FURMAN SELZ LLC



                                         By:  /s/ Richard A. Gumer
                                         ---------------------------
                                                  Richard A. Gumer
                                                  Managing Director


                                      - 8 -



We consent to the incorporation by reference in the registration statements of
Procept, Inc. on Form S-8 (File Nos. 33-76252, 33-81394, and 33-81392) of our
report, which includes an explanatory paragraph regarding substantial doubt
about the entity's ability to continue as a going concern, dated February 13,
1997 on our audits of the financial statements of Procept, Inc. as of December
31, 1996 and 1995, and for each of the three years in the period ended December
31, 1996, which report is included in this Annual Report on Form 10-K. We also
consent to the reference to our firm under the caption "Selected Financial
Data".

                                    /s/ Coopers & Lybrand L.L.P.
                                        COOPERS & LYBRAND L.L.P.

Boston, Massachusetts
March 27, 1997

                                  PROCEPT, INC.

             IMPORTANT FACTORS REGARDING FORWARD-LOOKING STATEMENTS

                                   March 1997

From time to time, Procept through its management may make forward-looking
public statements, such as statements concerning then expected future revenues
or earnings or concerning projected plans, performance, product development and
commercialization as well as other estimates relating to future operations.
Forward-looking statements may be in reports filed under the Securities Exchange
Act of 1934, as amended, in press releases or in oral statements made with the
approval of an authorized executive officer. The words or phrases "will likely
result," "are expected to," "will continue," "is anticipated," "estimate,"
"project," or similar expressions are intended to identify "forward-looking
statements" within the meaning of Section 21E of the Securities Exchange Act of
1934 and Section 27A of the Securities Act of 1933, as enacted by the Private
Securities Litigation Reform Act of 1995.

The Company wishes to caution readers not to place undue reliance on these
forward-looking statements which speak only as of the date on which they are
made. In addition, the Company wishes to advise readers that the factors listed
below, as well as other factors not currently identified by management, could
affect the Company's financial or other performance and could cause the
Company's actual results for future periods to differ materially from any
opinions or statements expressed with respect to future periods or events in any
current statement.

The Company will not undertake and specifically declines any obligation to
publicly release the result of any revisions which may be made to any
forward-looking statements to reflect events or circumstances after the date of
such statements or to reflect the occurrence of anticipated or unanticipated
events which may cause management to re-evaluate such forward-looking
statements.

In connection with the "safe harbor" provisions of the Private Securities
Litigation Reform Act of 1995, the Company is hereby filing cautionary
statements identifying important factors that could cause the Company's actual
results to differ materially form those projected in forward-looking statements
of the Company made by or on behalf of the Company.

Early Stage of Product Development; Uncertainty of Successful Commercialization

Since its inception the Company has generated no revenue from product sales. The
Company's research and development programs are at an early stage. The Company's
goal is to develop novel, highly specific, orally deliverable, small molecule
drugs as treatments for certain major disorders of the immune system. Although
the Company has identified compounds which it believes will have therapeutic
value, there can be no assurance that additional products will be discovered or
developed in the future. The products currently under development by the Company
will require significant additional research and development efforts, including
extensive clinical testing and regulatory approval, prior to commercial use.
Only one of the Company's product candidates has advanced to the clinical trial
phase. The Company's potential products are subject to the risks of failure
inherent in the development of pharmaceutical products based on new
technologies. These risks include the possibilities that the Company's
therapeutic approach will not be successful; that any or all of the Company's
potential products will be found to be unsafe, ineffective or toxic or otherwise
fail to meet applicable regulatory standards or receive necessary regulatory
clearances; that the potential products, if safe and effective, will be
difficult to develop into commercially viable products or to manufacture on a
large scale or will be uneconomical to market; that


<PAGE>



proprietary rights of third parties will preclude the Company from marketing
such products; or that third parties will market superior or equivalent
products.

Historical and Continuing Operating Losses; Uncertainty of Future Profitability

The Company is dependent upon research and development collaborations, external
financings and interest income to provide working capital to pursue its intended
business activities. There can be no assurance, however, that additional funding
will be available from any of these sources or, if available, will be available
on acceptable or affordable terms. The Company has not been profitable since
inception and has incurred an accumulated deficit of $48,703,200 through
December 31, 1996. Losses have resulted principally from costs incurred in
research and development activities related to the Company's efforts to develop
drug candidates and from the associated administrative costs. The Company
expects to incur significant additional operating losses over the next several
years and expects cumulative losses to increase substantially due to continued
research and development efforts, preclinical and clinical testing and
development of marketing, sales and production capabilities. In the next few
years, the Company's revenues may be limited to amounts received under research
or product development relationships that the Company has or may establish.
There can be no assurance, however, that the Company will be able to establish
any additional relationships on terms acceptable to the Company. The Company's
future profitability is dependent on its ability to identify commercially viable
products, to enter into agreements for product development and commercialization
with corporate sponsors, to develop and obtain patent protection and regulatory
approvals for its products and to develop the capability to manufacture and sell
its products. There can be no assurance that the Company will successfully
identify, develop, commercialize, patent, manufacture and market its products,
obtain required regulatory approvals or ever achieve profitability.

Additional Financing Requirements; Uncertainty of Available Funding

The Company will require substantial additional funds for its research and
product development programs, for operating expenses, for pursuing regulatory
clearances, for building production, sales and marketing capabilities and for
prosecuting and defending its intellectual property rights. The Company believes
that its current cash funds and revenue from interest income and its sponsored
research should be sufficient to fund its operating expenses and capital
requirements as currently planned into the third quarter of 1997. The Company's
actual cash requirements may vary materially from those now planned because of
results of research and development, clinical trials, product testing,
relationships with strategic partners, changes in the focus and direction of the
Company's research and development programs, competitive and technological
advances, the process of obtaining United States Food and Drug Administration
("FDA") or other regulatory approvals and other factors. Thereafter, the Company
will need to raise substantial additional capital to fund its operations. The
Company intends to seek such additional funding through public or private
financing or collaborative or other arrangements with corporate partners. If
additional funds are raised by issuing equity securities, further dilution to
existing stockholders will result and future investors may be granted rights
superior to those of existing stockholders. There can be no assurance, 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
funds are not available, the Company may be required to delay, reduce the scope
of or eliminate one or more of its research and development programs or to
obtain funds by entering into arrangements with collaborative partners or others
that require the Company to issue additional equity or to relinquish rights to
certain technologies or product candidates that the Company would not otherwise
issue or relinquish in order to continue independent operations.


                                      - 2 -

<PAGE>



Uncertainty Regarding Success of Clinical Trial

In January 1997, the Company initiated a Phase I clinical trial in Belgium and
London of a topical microbicide containing the Company's lead AIDS compound, PRO
2000, to test safety. There can be no assurance that the Company will not
encounter side effects or other problems that will cause it to delay or suspend
these trials. In addition, there can be no assurance that the trials, if
completed, will demonstrate that the PRO 2000 topical microbicide is safe and
effective.

Competition and Technological Change

Competitors of the Company in the United States and abroad are numerous and
include, among others, major pharmaceutical and chemical companies, specialized
biotechnology firms and universities and other research institutions.
Biotechnology and pharmaceutical companies are subject to rapid and significant
technological change. Competition may increase as a result of potential advances
in the commercial application of biotechnology and greater availability of
capital for investment in these fields. Acquisitions of competing companies and
potential competitors by large pharmaceutical companies or others could enhance
financial, marketing and other resources available to such competitors. As a
result of academic and government institutions becoming increasingly aware of
the commercial value of their research findings, such institutions are more
likely to enter into exclusive licensing agreements with commercial enterprises,
including competitors of the Company, to market commercial products. There can
be no assurance that the Company's competitors will not succeed in developing
technologies and products that are more effective than any which are being
developed by the Company or which would render the Company's technology and
products obsolete and noncompetitive. Many of these competitors have
substantially greater financial and technical resources and production and
marketing capabilities than the Company. In addition, some of the Company's
competitors have greater experience than the Company in conducting preclinical
testing and human clinical trials and obtaining FDA and other regulatory
approvals. Accordingly, the Company's competitors may succeed in obtaining FDA
or other regulatory approvals for products more rapidly than the Company. There
can be no assurance that the Company's products under development will be able
to compete successfully with competitors' existing products or products under
development or that they will obtain regulatory approval in the United States or
elsewhere. If the Company commences significant commercial sales of its
products, it will also be competing with respect to manufacturing efficiency and
marketing capabilities, areas in which it has limited or no experience.

Uncertainty of Patents and Proprietary Rights

The Company's success will depend in part on its ability to obtain United States
and foreign patent protection for its products, preserve its trade secrets and
operate without infringing on the proprietary rights of third parties. Because
of the length of time and expense associated with bringing new drugs through
development and regulatory approval to the marketplace, the health care industry
has traditionally placed considerable importance on obtaining patent and trade
secret protection for significant new technologies, products and processes.
There can be no assurance that any patents will issue from any of the patent
applications owned by, or licensed to, the Company. Further, there can be no
assurance that any rights the Company may have under issued patents will provide
the Company with significant protection against competitive products or
otherwise be commercially valuable. 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. There can be no assurance
that any existing or future patents issued to, or licensed by, the Company will
not subsequently be challenged, infringed upon, invalidated or circumvented by
others. If the Company's product candidates are found to infringe upon the
patents, or otherwise impermissibly utilize the intellectual property of others,
the Company's

                                      - 3 -

<PAGE>



development, manufacture and sale of such product candidates could be severely
restricted or prohibited. In such event, the Company may be required to obtain
licenses from third parties or otherwise obtain licenses to utilize patents or
proprietary rights of others. There can be no assurance that the Company will be
able to obtain such licenses on acceptable terms, or at all.

Impact of Government Regulation; Product Clearance and Approval

The FDA and comparable agencies in foreign countries impose substantial
requirements upon the introduction of therapeutic pharmaceutical products
through lengthy and detailed laboratory and clinical testing procedures,
sampling activities and other costly and time-consuming procedures. Satisfaction
of these requirements typically takes several years or more and can vary
substantially based upon the type, complexity and novelty of the product. The
Company cannot yet accurately predict when it might first submit New Drug
Applications for products for FDA or other regulatory review. Government
regulation also affects the manufacturing and marketing of pharmaceutical
products.

The effect of government regulation may be to delay marketing of the Company's
products for a considerable or indefinite period of time, impose costly
procedural requirements upon the Company's activities and furnish a competitive
advantage to larger companies or companies more experienced in regulatory
affairs. There can be no assurance that FDA or other regulatory approvals for
any products developed by the Company will be granted on a timely basis or at
all. Any delay in obtaining or any failure to obtain such approvals would
adversely affect the Company's ability to generate revenue. Even if initial
regulatory approvals for the Company's product candidates are obtained, the
Company, its products and its manufacturing facilities would be subject to
continual review and periodic inspection. The regulatory standards for
manufacturing are applied stringently by the FDA. Discovery of previously
unknown problems with a product, manufacturer or facility may result in
restrictions on such product, manufacturer or facility, including warning
letters, fines, suspensions of regulatory approvals, product recalls, operating
restrictions, delays in obtaining new product approvals, withdrawal of the
product from the market and criminal prosecutions. Other violations of FDA
requirements can result in similar penalties.

Reimbursement Uncertainty

Sales of the Company's product candidates will depend in part on the
availability of reimbursement from third-party health care payors, such as
government and private insurance plans. No assurance can be given that such
reimbursement will be available or will permit price levels sufficient to
realize an appropriate return on the Company's investment in product
development.

Dependence on Qualified Personnel

Since its inception, Dr. Ellis Reinherz has played a significant role in the
Company's research efforts. Dr. Reinherz acts as a scientific advisor to the
Company and is expected to remain in such capacity. Dr. Reinherz is a physician
at the Dana-Farber Cancer Institute ("Dana-Farber") and is a

                                      - 4 -

<PAGE>



member of the faculty of the Harvard Medical School. The regulations and
policies of the Harvard University Faculty of Medicine (the "Faculty of
Medicine") contain guidelines on conflicts of interest (the "Harvard
Guidelines") that govern the relationship between a faculty member and a
commercial enterprise with which he has a consulting arrangement or an ownership
interest. Pursuant to the Harvard Guidelines, the Faculty of Medicine has
determined to allow Dr. Reinherz to continue to conduct research in his
Dana-Farber laboratory supported by the Company, conditional on the continuation
of a research monitoring plan. If Dr. Reinherz were prohibited from continuing
or for any other reason discontinued his relationship with the Company, the
Company would be adversely affected.

The Company is highly dependent upon the efforts of its senior management and
scientific team, including its consultants. The loss of the services of one or
more of these individuals might impede the achievement of the Company's
development objectives. Because of the specialized scientific nature of the
Company's business, the Company is highly dependent upon its ability to attract
and retain qualified scientific and technical personnel. There is intense
competition among major pharmaceutical and chemical companies, specialized
biotechnology firms and universities and other research institutions for
qualified personnel in the areas of the Company's activities, and there can be
no assurance that the Company will be able to continue to attract and retain the
qualified personnel necessary for the development of its business. Loss of the
services of, or failure to recruit, key scientific and technical personnel would
be significantly detrimental to the Company's product development programs.

Dependence on Other Collaborators

The Company has research collaborations in effect with several academic and
governmental institutions. Although the Company believes parties to
collaborative arrangements have an economic motivation to succeed in performing
their contractual responsibilities, the amount and timing of resources which
they devote to these activities will not be within the control of the Company.
There can be no assurance that such parties will perform their obligations as
expected or that any revenue will be derived from such arrangements.

Uncertainty Regarding Future Collaborations

The Company's product development programs focusing on T-cell receptors ("TCRs")
and CD2 & CD4 were previously funded under sponsored research agreements with
E.R. Squibb & Sons, Inc. ("Bristol-Myers Squibb") and Sandoz Pharma Ltd.
("Sandoz"), respectively. Funding from Bristol-Myers Squibb for the TCR program
ceased upon the scheduled completion of the agreement in February 1995. Funding
from Sandoz for the CD2 program ceased as of September 1, 1995 in connection
with the amendment to the research agreement with Sandoz; funding from Sandoz
for the CD4 program ceased as of September 30, 1996.

   
The Company is currently seeking a new corporate partner to assist in the
development of each of the PRO 2000 Gel, CD2, and CD4 research programs.
Although the Company currently plans to continue to fund each of these programs,
there can be no assurance that the Company will be able to continue such
programs without a partner or that the Company will be successful in
establishing such collaborations and, if established, that such collaborations
would lead to the development of commercially viable products.
    

Limited Manufacturing, Marketing and Sales Capability and Experience

The Company has not yet invested in the development of manufacturing, marketing
or sales capabilities. Although the Company has a sufficient supply of PRO 2000
to complete the Phase I trial,

                                      - 5 -

<PAGE>


the Company lacks the facilities and personnel to manufacture products in
accordance with current Good Manufacturing Practices as prescribed by the FDA or
to produce an adequate supply of compounds to meet future requirements for
clinical trials. If the Company is unable to develop or contract for
manufacturing capabilities on acceptable terms, Procept's ability to conduct
human clinical testing with PRO 2000 and preclinical testing with the Company's
other product candidates, if any, will be adversely affected, resulting in
delays in the submission of products for regulatory approvals and in the
initiation of new development programs, which in turn could materially impair
the Company's competitive position and the possibility of achieving
profitability. The Company also will need to hire additional personnel skilled
in marketing and sales as it develops products with commercial potential. There
can be no assurance that the Company will be able to acquire, or establish
third-party relationships to provide, any or all of these capabilities.

Product Liability and Availability of Insurance

The Company's business exposes it to potential liability risks that are inherent
in the testing, manufacturing and marketing of medical products. The use of the
Company's products in clinical trials may expose the Company to product
liability claims and possible adverse publicity. These risks will expand with
respect to the Company's products, if any, that receive regulatory approval for
commercial sale. The Company currently has limited product liability coverage
for the clinical research use of its products, which management believes is
customary for a Company with products at this stage of clinical development. The
Company does not have product liability insurance for the commercial sale of its
products but intends to obtain such coverage if and when its products are
commercialized. However, such coverage is becoming increasingly expensive and
there can be no assurance that the Company will be able to maintain its existing
insurance coverage or obtain additional insurance coverage at acceptable costs,
if at all, or that a product liability claim would not adversely affect the
business or financial condition of the Company.

                                      - 6 -


<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>

This schedule contains summary financial information extracted from the balance
sheet at December 31, 1996 and the statement of operations for the twelve months
ended December 31, 1996 and is qualified in its entirety by reference to such
financial statements.

</LEGEND>

       
<S>                            <C>
<PERIOD-TYPE>                  YEAR
<FISCAL-YEAR-END>              DEC-31-1996
<PERIOD-START>                 JAN-01-1996
<PERIOD-END>                   DEC-31-1996
<CASH>                           1,962,229
<SECURITIES>                     4,001,625
<RECEIVABLES>                      172,812
<ALLOWANCES>                             0
<INVENTORY>                              0
<CURRENT-ASSETS>                 6,247,903
<PP&E>                           5,704,908
<DEPRECIATION>                   3,841,708
<TOTAL-ASSETS>                   8,917,266
<CURRENT-LIABILITIES>            2,145,399
<BONDS>                                  0
                    0
                              0
<COMMON>                           136,804
<OTHER-SE>                       6,179,303
<TOTAL-LIABILITY-AND-EQUITY>     8,917,266
<SALES>                                  0
<TOTAL-REVENUES>                 2,277,575
<CGS>                                    0
<TOTAL-COSTS>                   13,374,775
<OTHER-EXPENSES>                         0
<LOSS-PROVISION>                         0
<INTEREST-EXPENSE>                 138,560
<INCOME-PRETAX>                (11,235,760)
<INCOME-TAX>                             0
<INCOME-CONTINUING>            (11,235,760)
<DISCONTINUED>                           0
<EXTRAORDINARY>                          0
<CHANGES>                                0
<NET-INCOME>                   (11,235,760)
<EPS-PRIMARY>                        (0.97)
<EPS-DILUTED>                        (0.97)
        


</TABLE>


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