ANERGEN INC
S-1, 1996-06-28
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 28, 1996
 
                                                     REGISTRATION NO. 333-
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                                 ANERGEN, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                 <C>                                 <C>
             CALIFORNIA                             2836                             77-0183594
  (STATE OR OTHER JURISDICTION OF       (PRIMARY STANDARD INDUSTRIAL              (I.R.S. EMPLOYER
   INCORPORATION OR ORGANIZATION)       CLASSIFICATION CODE NUMBER)            IDENTIFICATION NUMBER)
</TABLE>
 
                              301 PENOBSCOT DRIVE
                         REDWOOD CITY, CALIFORNIA 94063
                                 (415) 361-8901
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
                             BARRY M. SHERMAN, M.D.
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                                 ANERGEN, INC.
                              301 PENOBSCOT DRIVE
                         REDWOOD CITY, CALIFORNIA 94063
                           TELEPHONE: (415) 361-8901
                            TELECOPY: (415) 361-8958
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                                  <C>
                BARRY E. TAYLOR, ESQ.                            WILLIAM H. HINMAN, JR., ESQ.
              TREVOR J. CHAPLICK, ESQ.                                SHEARMAN & STERLING
              ROBERT G. O'CONNOR, ESQ.                         555 CALIFORNIA STREET, SUITE 2000
          WILSON SONSINI GOODRICH & ROSATI                      SAN FRANCISCO, CALIFORNIA 94104
              PROFESSIONAL CORPORATION                                  (415) 616-1100
                 650 PAGE MILL ROAD
             PALO ALTO, CALIFORNIA 94304
                   (415) 493-9300
</TABLE>
 
                            ------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
 
     If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  / /
 
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  / /
 
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  / /
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  / /
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
================================================================================================================
                                                                  PROPOSED         PROPOSED
TITLE OF EACH CLASS OF                          AMOUNT TO     MAXIMUM OFFERING MAXIMUM AGGREGATE    AMOUNT OF
SECURITIES TO BE REGISTERED                  BE REGISTERED(1) PRICE PER SHARE(2) OFFERING PRICE(2) REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------------
<S>                                          <C>              <C>              <C>              <C>
Common Stock, no par value.................. 4,600,000 shares     $4.6875        $21,562,500         $7,436
================================================================================================================
</TABLE>
 
(1) Includes 600,000 shares that the Underwriters have the option to purchase to
    cover over-allotments, if any.
 
(2) Estimated solely for the purpose of calculating the amount of the
    registration fee in accordance with Rule 457 under the Securities Act of
    1933, as amended.
                            ------------------------
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SUCH SECTION 8(a),
MAY DETERMINE.
================================================================================
<PAGE>   2
 
                                 ANERGEN, INC.
                            ------------------------
 
                             CROSS-REFERENCE SHEET
         PURSUANT TO ITEM 501(b) OF REGULATION S-K SHOWING LOCATION IN
                     PROSPECTUS OF PART I ITEMS OF FORM S-1
 
<TABLE>
<CAPTION>
          ITEM NUMBER AND HEADING IN FORM S-1
                REGISTRATION STATEMENT                  LOCATION OF CAPTION IN PROSPECTUS
      -------------------------------------------  -------------------------------------------
<C>   <S>                                          <C>
  1.  Forepart of the Registration Statement and
      Outside Front Cover Page of Prospectus.....  Forepart of Registration Statement; Outside
                                                   Front Cover Page; Additional Information
  2.  Inside Front and Outside Back Cover Pages
      of Prospectus..............................  Inside Front Cover Page; Outside Back Cover
                                                   Page
  3.  Summary Information, Risk Factors and Ratio
      of Earnings to Fixed Charges...............  Prospectus Summary; Risk Factors
  4.  Use of Proceeds............................  Use of Proceeds
  5.  Determination of Offering Price............  Not Applicable
  6.  Dilution...................................  Dilution; Risk Factors
  7.  Selling Security Holders...................  Not Applicable
  8.  Plan of Distribution.......................  Outside and Inside Front Cover Pages;
                                                   Underwriting; Outside Back Cover Page
  9.  Description of Securities to be
      Registered.................................  Prospectus Summary; Dividend Policy;
                                                   Capitalization; Description of Capital
                                                   Stock; Shares Eligible for Future Sale
 10.  Interests of Named Experts and Counsel.....  Not Applicable
 11.  Information with Respect to the
      Registrant.................................  Outside and Inside Front Cover Pages;
                                                   Prospectus Summary; Risk Factors; Use of
                                                   Proceeds; Dividend Policy; Capitalization;
                                                   Price Range of Common Stock; Dilution;
                                                   Selected Financial Data; Management's
                                                   Discussion and Analysis of Financial
                                                   Condition and Results of Operations;
                                                   Business; Management; Certain Transactions;
                                                   Principal Stockholders; Description of
                                                   Capital Stock; Shares Eligible for Future
                                                   Sale; Financial Statements; Outside Back
                                                   Cover Page
 12.  Disclosure of Commission Position on
      Indemnification for Securities Act
      Liabilities................................  Not Applicable
</TABLE>
<PAGE>   3
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES
     IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL
     PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY
     SUCH STATE.
 
                             SUBJECT TO COMPLETION
 
                   PRELIMINARY PROSPECTUS DATED JUNE 28, 1996
 
                                4,000,000 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
                            ------------------------
 
     All the shares of Common Stock offered hereby are being sold by Anergen,
Inc. The Common Stock is traded on the Nasdaq National Market under the symbol
ANRG. On June 27, 1996, the closing sale price of the Company's Common Stock as
reported by Nasdaq was $4.63 per share. See "Price Range of Common Stock."
 
 THESE SECURITIES INVOLVE A HIGH DEGREE OF RISK. SEE "RISK FACTORS" AT PAGE 6.
                            ------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
   SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
      COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR
        ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY
          OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
                      THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<S>                               <C>                  <C>                  <C>
- -----------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------
                                                          Underwriting
                                       Price to           Discounts and         Proceeds to
                                        Public           Commissions(1)         Company(2)
- -----------------------------------------------------------------------------------------------
Per Share.......................           $                    $                    $
- -----------------------------------------------------------------------------------------------
Total...........................           $                    $                    $
- -----------------------------------------------------------------------------------------------
Total Assuming Full Exercise of
  Over-Allotment Option(3)......           $                    $                    $
- -----------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------
</TABLE>
 
(1) See "Underwriting."
(2) Before deducting expenses estimated at $400,000, which are payable by the
    Company.
(3) Assuming exercise in full of the 30-day option granted by the Company to the
    Underwriters to purchase up to 600,000 additional shares, on the same terms,
    solely to cover over-allotments. See "Underwriting."
                            ------------------------
 
     The shares of Common Stock are offered by the Underwriters, subject to
prior sale, when, as and if delivered to and accepted by the Underwriters and
subject to their right to reject orders in whole or in part. It is expected that
delivery of the Common Stock will be in New York City on or about             ,
1996.
 
                            ------------------------
 
PAINEWEBBER INCORPORATED                   VECTOR SECURITIES INTERNATIONAL, INC.
 
                            ------------------------
 
               THE DATE OF THIS PROSPECTUS IS             , 1996.
<PAGE>   4
[Graphic entitled "Autoimmune Cascade in Multiple Sclerosis" depicting a
macrophage engulfing a self-antigen from a nerve cell and presenting that
self-antigen on its surface. It further shows that the binding of the
self-antigen to the T cell receptor, when accompanied by "second signals"
from the macrophage, triggers T cell proliferation and the production of
cytokines that attack and damage the nerve cell]

[graphic subtitled "AnergiX(TM)" depicting T cells being bound by AnergiX 
compounds, going into a state of inactivation or anergy, and not attacking the 
nerve cell]

[graphic subtitled "AnervaX(TM)" depicting patient's antibodies binding to a
portion of the MHC protein on the surface of a macrophage, thereby preventing
the interaction between a T cell and the self-antigen presented by the
macrophage]





 
     The terms Anergen, AnergiX, MS/AnergiX, MG/AnergiX, RA/AnergiX,
IDDM/AnergiX, and AnervaX are trademarks of the Company.
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE COMPANY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
                            ------------------------
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY ENGAGE IN PASSIVE
MARKET-MAKING TRANSACTIONS IN THE COMMON STOCK OF THE COMPANY ON THE NASDAQ
STOCK MARKET IN ACCORDANCE WITH RULE 10B-6A UNDER THE SECURITIES EXCHANGE ACT OF
1934. SEE "UNDERWRITING."
 
                                        2
<PAGE>   5
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information, including "Risk Factors," and the Financial Statements and Notes
thereto, appearing elsewhere in this Prospectus. This Prospectus contains
forward-looking statements that involve risks and uncertainties. The Company's
actual results may differ materially from the results discussed in the forward-
looking statements. Factors that might cause such a difference include, but are
not limited to, those discussed in "Risk Factors," "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and "Business" as
well as elsewhere in this Prospectus.
 
                                  THE COMPANY
 
     Anergen, Inc. ("Anergen" or "the Company") is focused on the treatment of
autoimmune diseases through the discovery and development of proprietary
therapeutics that selectively interrupt the disease process. Anergen's current
research and development efforts are focused on two distinct core technologies,
AnergiX(TM) and AnervaX(TM), that the Company believes may be used to treat a
broad range of autoimmune diseases without generally suppressing the immune
system. Patient selection has begun for a Phase I clinical trial of the
Company's AnergiX compound for the treatment of multiple sclerosis ("MS") and
the Company has initiated a Phase II clinical trial of its AnervaX compound for
the treatment of rheumatoid arthritis ("RA"). Since 1993, the Company has
collaborated with Novo Nordisk A/S ("Novo Nordisk") in the development of
AnergiX treatments for MS, insulin dependent diabetic mellitus ("IDDM") and
myasthenia gravis ("MG"). In June 1996, the Company announced a collaborative
agreement with N.V. Organon ("Organon") to develop an AnergiX treatment for RA.
 
     In the body's immune system, T cells normally regulate the identification
and destruction of foreign substances and malignant cells. Autoimmune diseases
are caused by abnormal destruction of healthy body tissues by disease-specific T
cells. Anergen's results to date suggest that treatments based on its core
technologies may interrupt the chain of events fundamental to the onset and
continuation of certain autoimmune diseases. The Company's AnergiX technology
selectively destroys or inactivates (anergizes) the T cells implicated in the
disease process. Its second core technology, AnervaX, stimulates the immune
system to produce antibodies that block the presentation of self-antigens to
destructive T cells. The Company believes that, because its potential
therapeutics target only disease-specific T cells, the normal function of the
immune system should remain unaffected. In contrast, currently available
therapies for autoimmune diseases treat only the symptoms of the disease or
broadly suppress the immune system, which can compromise the ability of the
immune system to protect against foreign substances.
 
     Anergen received investigational new drug application ("IND") clearance in
December 1995 with the United States Food and Drug Administration ("FDA") to
begin Phase I clinical testing of its AnergiX compound for the treatment of MS.
In preclinical studies, the administration of an AnergiX compound prevented or
reduced disease symptoms caused by the T cell initiated autoimmune response in
animal models. The Company has also demonstrated in vitro that its AnergiX
compound can inactivate human T cells associated with MS. The Company is
collaborating with Novo Nordisk on the development of this compound.
 
     In April 1996, the Company initiated a multicenter, double-blind,
placebo-controlled Phase II clinical trial of its AnervaX compound for the
treatment of RA. The results of a Phase I clinical trial completed in October
1995 indicated that AnervaX is well tolerated and can stimulate an immune
response in RA patients. Preclinical results have also demonstrated that the
Company's AnervaX approach may prevent the onset or reduce the severity of
autoimmune disease in animal models.
 
     The Company entered into a collaborative agreement with Novo Nordisk in
August 1993 under which Novo Nordisk, in exchange for certain marketing rights,
will support research and development of the Company's MS, MG and IDDM programs,
make milestone payments, and pay royalties on product sales, if any. The Company
has the right to co-promote any resultant products for MS and MG in North
America. In addition, at the time of the agreement, Novo Nordisk made an $8
million equity investment in the Company.
 
                                        3
<PAGE>   6
 
In March 1996, the development program with Novo Nordisk was extended through
August 1998, increasing total funds expected to be received by the Company under
the collaboration from $25 million to $35 million. These amounts do not include
the cost of clinical trials that will be borne directly by Novo Nordisk.
 
     In June 1996, the Company entered into a collaborative agreement with
Organon under which Organon, in exchange for certain marketing rights, will
support research and development of an AnergiX compound to treat RA that
incorporates a proprietary peptide discovered by Organon. Under the arrangement,
Organon will also pay the Company a one-time license fee, make milestone
payments and pay royalties on product sales, if any. The license fee, research
and development support and milestone payments that the Company may receive
under this agreement are estimated to exceed $15 million. These amounts do not
include the cost of clinical trials that will be borne directly by Organon.
 
     The Company was incorporated in California in April 1988 as Biospan
Corporation and changed its name to Anergen, Inc. in July 1991. The Company's
principal executive offices are located at 301 Penobscot Drive, Redwood City,
California 94063, and its telephone number at that location is (415) 361-8901.
 
                                        4
<PAGE>   7
 
                                  THE OFFERING
 
<TABLE>
<S>                                           <C>
Common Stock Offered by the Company.......    4,000,000 shares(1)
Common Stock to be Outstanding after the
  Offering................................    19,029,430 shares(2)
Use of Proceeds...........................    Research and product development, clinical
                                              trials, additional personnel, capital
                                              equipment, manufacturing expansion and other
                                              working capital and general corporate purposes.
                                              See "Use of Proceeds."
Nasdaq National Market Symbol.............    ANRG
</TABLE>
 
- ---------------
(1) Assumes no exercise of the Underwriters' over-allotment option to purchase
    up to 600,000 additional shares of Common Stock.
(2) Based upon the number of shares outstanding as of March 31, 1996. Excludes
    825,815 shares issuable upon exercise of options outstanding under the
    Company's 1988 Stock Option Plan, 20,000 shares issuable upon exercise of
    options outstanding under the Company's 1995 Director Option Plan and
    459,015 shares of Common Stock issuable upon exercise of outstanding
    warrants. See "Capitalization," "Management -- Incentive Stock Plans" and
    Note 6 to Financial Statements.
 
                         SUMMARY FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                THREE MONTHS
                                                                                                    ENDED
                                                        YEAR ENDED DECEMBER 31,                   MARCH 31,
                                            -----------------------------------------------   -----------------
                                             1991      1992      1993      1994      1995      1995      1996
                                            -------   -------   -------   -------   -------   -------   -------
<S>                                         <C>       <C>       <C>       <C>       <C>       <C>       <C>
STATEMENTS OF OPERATIONS DATA:
Revenues:
  Contract revenues -- related party......  $    --   $    --   $   339   $ 2,325   $ 3,001   $   551   $   783
  Interest income.........................      163       544       312       207       533        17       139
                                            -------   -------   -------   -------   -------   -------   -------
         Total revenues...................      163       544       651     2,532     3,534       568       922
                                            -------   -------   -------   -------   -------   -------   -------
Expenses:
  Research and development................    2,696     4,525     5,553     7,423     8,322     1,898     1,895
  General and administrative..............    1,218     1,494     1,716     1,831     1,976       462       503
  Interest expense........................      142        78       226       238       322        71        55
                                            -------   -------   -------   -------   -------   -------   -------
         Total expenses...................    4,056     6,097     7,495     9,492    10,620     2,431     2,453
                                            -------   -------   -------   -------   -------   -------   -------
Net loss..................................  $(3,893)  $(5,553)  $(6,844)  $(6,960)  $(7,086)  $(1,863)  $(1,531)
                                            =======   =======   =======   =======   =======   =======   =======
Net loss per share(1).....................  $ (0.96)  $ (0.99)  $ (1.12)  $ (0.97)  $ (0.55)  $ (0.25)  $ (0.10)
                                            =======   =======   =======   =======   =======   =======   =======
Shares used in calculating per share
  data(1).................................    4,059     5,599     6,118     7,202    12,859     7,527    14,984
                                            =======   =======   =======   =======   =======   =======   =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                                          MARCH 31, 1996
                                                                    --------------------------
                                                                    ACTUAL      AS ADJUSTED(2)
                                                                    -------     --------------
<S>                                                                 <C>         <C>
BALANCE SHEET DATA:
Cash, equivalents and short-term investments......................  $ 9,653        $ 27,953
Total assets......................................................   12,461          30,761
Long-term portion of capital lease obligations and debt...........      636             636
Total shareholders' equity........................................   10,190          28,490
</TABLE>
 
- ---------------
(1) See Note 1 to Financial Statements for the method used to determine shares
    used in calculating per share data.
(2) Adjusted to reflect the sale by the Company of the 4,000,000 shares of
    Common Stock offered hereby at an assumed public offering price of $5.00 per
    share.
 
                                        5
<PAGE>   8
 
                                  RISK FACTORS
 
     An investment in the shares being offered hereby involves a high degree of
risk. Prospective investors should carefully consider the following risk
factors, in addition to the other information contained in this Prospectus,
before purchasing the shares of Common Stock offered hereby. This Prospectus
contains forward-looking statements that involve risks and uncertainties. The
Company's actual results may differ materially from the results discussed in the
forward-looking statements. Factors that might cause such a difference include,
but are not limited to, those discussed in "Risk Factors," "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
"Business" as well as elsewhere in this Prospectus.
 
EARLY STAGE OF PRODUCT DEVELOPMENT; LACK OF COMMERCIAL PRODUCTS; NO ASSURANCE OF
SUCCESSFUL PRODUCT DEVELOPMENT
 
     The Company was founded in 1988 to discover and develop biopharmaceutical
compounds for the treatment of autoimmune diseases. To achieve profitable
operations, the Company, alone or with others, must successfully develop, obtain
regulatory approval for, manufacture and market products. The Company does not
have any products available for sale nor does it expect to have any products
commercially available for at least several years, if at all. The Company's
potential products are at the early stages of research and development, with
only limited human testing of certain of the Company's products undertaken to
date. The products currently under development by the Company will require
significant additional research, laboratory testing and clinical trials and
investment of capital prior to their commercialization. There can be no
assurance that any potential products will be successfully developed, prove to
be safe and efficacious in clinical trials, meet applicable regulatory
standards, be capable of being produced in commercial quantities at acceptable
costs or be successfully marketed. See "Business -- Products Under Development."
 
HISTORY OF NET LOSSES; ACCUMULATED DEFICIT
 
     The Company has experienced significant net losses every year since its
inception in 1988. Net losses for the fiscal years ended December 31, 1994 and
1995 and the quarter ended March 31, 1996 were approximately $7.0 million, $7.1
million and $1.5 million, respectively, and the Company had an accumulated
deficit of approximately $37.8 million as of March 31, 1996. The Company expects
to incur substantial and increasing net losses for at least the next several
years. The amount of net losses and the time required by the Company to reach
profitability are highly uncertain. There can be no assurance that the Company
will ever be able to generate product revenue or achieve profitability on a
substantial basis or at all. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations."
 
FUTURE REQUIREMENT FOR SIGNIFICANT ADDITIONAL CAPITAL
 
     The Company anticipates that its current cash and short-term investments
and expected revenues under its collaborations, combined with the estimated net
proceeds of this offering, will be sufficient to fund the Company's operations
for at least two years. The Company anticipates that such resources will be
primarily used to fund clinical testing of AnervaX for RA, and continued
research and development and preparation for clinical testing of AnergiX for the
treatment of IDDM and MG and additional research and development. The balance of
such resources will be used to fund continued limited research on other
autoimmune diseases and general and administrative activities, including those
associated with seeking collaborative arrangements to enable the Company to
increase its research and development activities in other autoimmune diseases.
The Company's working capital requirements over the next two years may vary
depending upon numerous factors, including the progress of the Company's
research and development programs, manufacturing activities, the progress of the
Company's clinical programs, the results of laboratory testing, the time and
cost required to seek regulatory approvals to commence clinical trials for the
Company's initial products, the need to obtain licenses to other proprietary
rights, any required adjustments to the Company's operating plan to respond to
competitive pressures or technological advances, developments with respect to
existing or future collaborative arrangements and the availability of various
methods of financing. In addition to this offering, the Company expects to seek
to raise additional capital through equity or debt financing, research and
development collaborations with corporate partners or through other sources. Any
additional equity financing may be
 
                                        6
<PAGE>   9
 
dilutive to shareholders, and debt financing, if available, may involve
restrictions on stock dividends and other restrictions on the Company. Adequate
funds for the Company's operations, whether from equity or debt financings,
collaborative or other arrangements with corporate partners or from other
sources, may not be available when needed or on terms attractive to the Company.
Insufficient funds may require the Company to delay, scale back or eliminate
some or all of its research and product development programs or to license third
parties to commercialize products or technologies that the Company would
otherwise seek to develop itself. The Company's liquidity will be reduced as
amounts are expended for continuing research and development. See "Use of
Proceeds" and "Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Liquidity and Capital Resources."
 
UNCERTAINTIES RELATED TO PRECLINICAL AND CLINICAL TRIALS
 
     Before obtaining regulatory approvals for the commercial sale of any of its
products under development, the Company must demonstrate through preclinical
studies and clinical trials that the product is safe and efficacious for use in
each target indication. The results from preclinical studies and early clinical
trials may not be predictive of results that will be obtained in large-scale
testing, and there can be no assurance that the Company's clinical trials will
demonstrate the safety and efficacy of any products or will result in any
marketable products. A number of companies in the biotechnology industry have
suffered significant setbacks in advanced clinical trials, even after promising
results in earlier trials. The failure to adequately demonstrate the safety and
efficacy of a therapeutic product under development could delay or prevent
regulatory approval of the product and could have a material adverse effect on
the Company.
 
     The rate of completion of the Company's clinical trials is dependent upon,
among other factors, the FDA's willingness to allow Anergen to proceed; the
results of Anergen's continued research and development, including test results
and success in producing the epitopes and MHC molecules for each AnergiX
compound; the number of skilled scientists, clinicians, and consultants the
Company is able to employ in its efforts and the general interest in the medical
community in a therapeutic using the Company's approach for treatment of the
diseases targeted by the Company. Currently, the Company does not anticipate
establishing its own clinical trials facility. The rate of completion of
clinical trials is also dependent on patient enrollment, which is a function of
many factors, including the size of the patient population, the proximity of
patients to clinical sites and the existence of competitive trials. If the
Company is unable to successfully complete its clinical trials, its business,
financial condition and results of operations could be materially and adversely
affected. See "Business -- Government Regulation."
 
UNCERTAINTY OF MARKET ACCEPTANCE
 
     Even if the requisite regulatory approvals are obtained for the Company's
potential products or for products developed in collaboration with the Company,
uncertainty exists as to whether such products will be accepted by the market. A
number of factors also may limit the market acceptance of a product which may be
developed by, or discovered through collaboration with, the Company, including
the rate of adoption by health care practitioners, the indications for which the
product is approved, the rate of the product's acceptance by the target
population, the timing of market entry relative to competitive products, the
availability of alternative therapies, the price of the Company's product
relative to alternative therapies, the availability of third-party reimbursement
and the extent of marketing efforts by the Company and third-party distributors
or agents retained by the Company. Side effects or unfavorable publicity
concerning a Company product or any similar product could have an adverse effect
on the Company's ability to obtain physician, patient or third-party payor
acceptance and on efforts to sell that product. There can be no assurance of the
Company's ability, or the length of time required, to achieve commercialization
of the Company's products or that physicians, patients or third party payors
will accept any of the Company's products as readily as alternative therapies,
or at all. See "Business -- Products Under Development" and "-- Pharmaceutical
Pricing and Reimbursement."
 
GOVERNMENT REGULATION; NO ASSURANCE OF OBTAINING PRODUCT APPROVALS
 
     The Company's research and development activities are subject to regulation
by numerous governmental authorities in the United States and other countries.
Further, the future production and marketing of any
 
                                        7
<PAGE>   10
 
products developed by the Company would also be regulated, particularly as to
safety and efficacy. In the United States, vaccines, drugs and biologics are
subject to rigorous FDA review. The Federal Food, Drug, and Cosmetic Act, the
Public Health Service Act and other federal statutes and regulations govern or
influence the testing, manufacture, safety, labeling, storage, record keeping,
approval, advertising and promotion of such products. Noncompliance with
applicable requirements can result in fines, recall or seizure of products,
clinical study holds, total or partial suspension of production, refusal of the
government to approve New Drug Applications ("NDA"), Product License
Applications ("PLA"), Establishment License Applications ("ELA") or allow the
Company to enter into supply contracts and criminal prosecution. The FDA also
has the authority to revoke PLAs and ELAs previously granted.
 
     In order to obtain FDA approval of a new biological product, the Company
must submit proof of safety, purity, potency and efficacy. In most cases such
proof entails extensive pre-clinical, laboratory, and clinical tests. The
testing, preparation of necessary marketing applications and processing of those
applications by the FDA is expensive and time consuming, can vary based on the
type of product, and may take several years to complete. There is no assurance
that the FDA will act favorably or quickly in making such reviews, and
significant difficulties or costs may be encountered by the Company in its
efforts to obtain FDA approvals that could delay or preclude the Company from
marketing any products it may develop or furnish an advantage to competitors.
The FDA may also require post-marketing testing and surveillance to monitor the
effects of approved products or place conditions on any approvals that could
restrict the commercial applications of such products. Product approvals may be
withdrawn if compliance with regulatory standards is not maintained or if
problems occur following initial marketing. In addition, delays imposed by the
governmental approval process may materially reduce the period during which the
Company may have the exclusive right to exploit patented products or
technologies.
 
     The FDA approval process for a new biological drug involves completion of
pre-clinical studies which include laboratory tests and animal studies to assess
safety and effectiveness of the drug. Among other things, the results of these
studies as well as how the product will be manufactured, are submitted to the
FDA in an IND and, unless the FDA objects, the IND becomes effective 30 days
following receipt by the FDA. FDA-cleared human clinical trials may then be
conducted. The results of the clinical trials are submitted to the FDA as part
of a PLA. In addition to obtaining FDA approval for each AnergiX indication, an
ELA must be filed and the FDA must approve the manufacturing facilities for the
product. Product sales may commence only if the PLA and ELA are approved.
Regulatory requirements for obtaining such FDA approvals are rigorous and there
can be no assurance that such approvals will be obtained on a timely basis or at
all.
 
     Sales of pharmaceutical products outside the United States are subject to
foreign regulatory requirements that vary widely from country to country. The
time required to obtain approvals required by foreign countries may be longer or
shorter than that required for FDA approval, and requirements for licensing may
differ from FDA requirements.
 
     If approval is obtained, the Company will be subject to continuing FDA
obligations. When manufacturing biologics, the Company will be required to
adhere to regulations setting forth current Good Manufacturing Practices
("GMP"), which require that the Company manufacture its products and maintain
its records in a prescribed manner with respect to manufacturing, testing and
quality control activities. Further, the Company must pass a preapproval
inspection of its manufacturing facilities by the FDA before obtaining approval.
 
     Satisfaction of these FDA requirements, or similar requirements by foreign
regulatory agencies, typically takes several years and the time needed to
satisfy them may vary substantially, based upon the type, complexity and novelty
of the pharmaceutical product. The effect of government regulation may be to
delay or to prevent marketing of potential products for a considerable period of
time and to impose costly procedures upon the Company's activities. There can be
no assurance that the FDA or any other regulatory agency will grant approval for
any products or indications being developed by the Company on a timely basis, or
at all. Success in preclinical or early stage clinical trials does not assure
success in later stage clinical trials. Data obtained from preclinical and
clinical activities are susceptible to varying interpretations which could
delay, limit or prevent regulatory approval. If regulatory approval of a product
is granted, such approval may impose limitations on the indicated uses for which
a product may be marketed. Further, even if regulatory approval is
 
                                        8
<PAGE>   11
 
obtained, later discovery of previously unknown problems with a product may
result in restrictions on the product, including withdrawal of the product from
the market. Delay in obtaining or failure to obtain regulatory approvals would
have a material adverse effect on the Company's business, financial condition
and results of operations. See "Business -- Government Regulation."
 
DEPENDENCE UPON COLLABORATIVE PARTNERS
 
     The Company's strategy for the development, clinical trials, manufacturing
and commercialization of its products includes maintaining and entering into
various collaborations with corporate partners, licensors, licensees and others.
To date, the Company has entered into collaborative arrangements with Novo
Nordisk with respect to the Company's AnergiX compounds for the treatment of MS,
MG and IDDM, and with Organon with respect to an AnergiX compound for the
treatment of RA. There can be no assurance that the interests and motivations of
the Company's collaborators are, or will remain, aligned with those of the
Company or that such collaborators will successfully perform their development,
regulatory compliance, manufacturing or marketing functions or that such
collaborations will continue. There can also be no assurance that the Company
will be able to negotiate additional collaborative arrangements in the future on
acceptable terms, if at all, or that any such collaborative arrangements will be
successful. To the extent that the Company is not able to maintain or establish
such arrangements, the Company would be required to undertake such activities at
its own expense, which would significantly increase the Company's capital
requirements and limit the programs the Company is able to pursue. In addition,
the Company may encounter significant delays in introducing its products into
certain markets or find that the development, manufacture or sale of its
products in such markets is adversely affected by the absence of such
collaborative agreements.
 
     The Company cannot control the amount and timing of resources which its
collaborative partners devote to the Company's program or potential products,
which can vary because of factors unrelated to the potential product.
Collaborator participation will depend not only on the achievement of research
objectives by the Company and its collaborators, which cannot be assured, but
also on each collaborator's own financial, competitive, marketing and strategic
considerations, which are outside the Company's control. Such strategic
considerations may include the relative advantages of alternative products being
marketed or developed by others, including relevant patent and proprietary
positions. The Company's collaborative partners may develop, either alone or
with others, products that compete with the development and marketing of the
Company's products. Competing products, either developed by the collaborative
partners or to which the collaborative partners have rights, may result in their
withdrawal of support with respect to all or a portion of the Company's
technology, which would have a material adverse effect on the Company's
business, financial condition and results of operations. If Novo Nordisk,
Organon or any future collaborative partner breaches or terminates their
agreements with the Company or otherwise fails to conduct their collaborative
activities in a timely manner, the preclinical or clinical development or
commercialization of product candidates or research programs will be delayed,
and the Company will be required to devote additional resources to product
development and commercialization or terminate certain development programs.
There also can be no assurance that disputes will not arise in the future with
respect to the ownership of rights to any technology developed with third
parties. These and other possible disagreements between collaborators and the
Company could lead to delays in the collaborative research, development and
commercialization of certain product candidates or could require or result in
litigation or arbitration, which would be time consuming and expensive, and
would have a material adverse effect on the Company's business, financial
condition and results of operations. See "Management's Discussion and Analysis
of Financial Condition and Results of Operations -- Liquidity and Capital
Resources" and "Business -- Collaborative Arrangements" and "-- Manufacturing."
 
UNCERTAINTY RELATING TO PATENTS AND PROPRIETARY RIGHTS
 
     The Company's success will depend in significant part on its ability to
maintain patent protection for its therapeutic approach and for any developed
products, to preserve its trade secrets and to operate without infringing the
proprietary rights of third parties. Although the Company has obtained patents
covering certain aspects of its technology, no assurance can be given that
additional patents will be issued or, if issued, that the
 
                                        9
<PAGE>   12
 
scope of any patent protection will be significant, or that the patents will be
held valid if subsequently challenged. Moreover, the Company cannot ascertain
with certainty that no patent conflict will exist with other products or
processes which could compete with the Company's approaches.
 
     Because of the length of time and expense associated with bringing new
products through development and to the marketplace, and the length of time
required for the governmental approval process, the pharmaceutical industry has
traditionally placed considerable importance on obtaining and maintaining patent
and trade secret protection for significant new technologies, products and
processes. The Company and other biotechnology and pharmaceutical firms have
applied, and are applying, for patents for their products and certain aspects of
their technologies. The enforceability of patents issued to biotechnology and
pharmaceutical firms is highly uncertain. Federal court decisions indicating
legal considerations surrounding the validity of patents in the field are in
transition, and there can be no assurance that the historical legal standards
surrounding questions of validity will continue to be applied or that current
defenses as to issued patents in the field will offer protection in the future.
In addition, there can be no assurance as to the degree and range of protection
any patents will afford, whether patents will issue or the extent to which the
Company will be successful in not infringing patents granted to others.
 
     While the Company pursues patent protection for products and processes
where appropriate, it also relies on trade secrets, know-how and continuing
technological advancement to develop and maintain its competitive position. The
Company's policy is to have each employee enter into an agreement that contains
provisions prohibiting the disclosure of confidential information to anyone
outside the Company. Research and development contracts and relationships
between the Company and its scientific consultants provide access to aspects of
the Company's know-how that is protected generally under confidentiality
agreements with the parties involved. There can be no assurance, however, that
these confidentiality agreements will be honored or that the Company can
effectively protect its rights to its unpatented trade secrets. Moreover, there
can be no assurance that others will not independently develop substantially
equivalent proprietary information and techniques or otherwise gain access to
the Company's trade secrets.
 
     The Company may be required to obtain licenses to patents or other
proprietary rights from third parties. There can be no assurance that any
licenses required under any patents or proprietary rights will be made available
on terms acceptable to the Company, if at all. If the Company does not obtain
required licenses, it could encounter delays in product development while it
attempts to redesign products or methods or it could find that the development,
manufacture or sale of products requiring such licenses could be foreclosed.
 
     The Company is aware of a European patent and corresponding U.S. and
Australian patents which contain claims that relate to certain of the Company's
proposed products and their uses. In accordance with European Patent Office
("EPO") procedures, third parties can oppose an EPO patent grant by presenting
information which they believe justifies narrowing or revoking the grant of the
patent. The Company is opposing the aforementioned grant in the EPO. There can,
however, be no assurance that the granted EPO claims will be revoked or
significantly narrowed in scope as a result of the opposition proceeding. If
valid claims in these patents are found to be infringed by the Company's
products, the Company's ability to make, use, offer to sell, or sell, such
products could be materially and adversely affected.
 
     In addition, the Company could incur substantial costs in defending any
patent litigation brought against it or in asserting the Company's patent
rights, including those licensed to the Company by others, in a suit against
another party. The United States Patent and Trademark Office (the "USPTO") could
institute interference proceedings in connection with one or more of the
Company's patents or patent applications, which proceedings could result in an
adverse decision as to priority of an invention. The USPTO also could institute
reexamination proceedings in connection with one or more of the Company's
patents or patent applications, which could result in an adverse decision as to
the patents' validity or scope. See "Business -- Patents and Proprietary
Rights."
 
NEED TO DEVELOP MANUFACTURING CAPABILITIES; RELIANCE ON SOLE SUPPLIER
 
     The Company has no volume manufacturing capacity or experience in volume
manufacturing of pharmaceutical or other biological products. Establishing its
own volume manufacturing capabilities would
 
                                       10
<PAGE>   13
 
require significant scale-up expenses and additions to facilities and personnel.
In addition, the Company must successfully develop the process required for
volume manufacturing. The pharmaceutical products under development by the
Company have never been manufactured on a commercial scale and there can be no
assurance that such products can be manufactured at a cost or in quantities to
make them commercially viable. The Company will be required to establish
arrangements with contract manufacturers to supply a portion of its compounds
for subsequent clinical trials as well as the manufacture, packaging, labeling
and distribution of finished products. If the Company is unable to contract for
sufficient supply of a portion of its compounds on acceptable terms, and it is
unable to develop the capability to produce the epitopes internally, the
Company's human clinical testing schedule would be delayed, resulting in the
delay of submission of products for regulatory approval and initiation of new
development programs, which would have a material adverse effect on the Company.
If the Company should encounter delays or difficulties in establishing
relationships with manufacturers to produce, package and distribute its finished
products, market introduction and subsequent sales of such products would be
adversely affected. Moreover, contract manufacturers that the Company may use
must adhere to current GMP regulations enforced by the FDA through its
facilities inspection program. If these facilities cannot pass a pre-approval
plant inspection, the FDA pre-market approval of the products will be adversely
affected.
 
     The Company is dependent on a single supplier, HyClone Laboratories, Inc.
("HyClone"), for approximately 14% of its consumable supplies in fiscal 1995.
The Company does not have a contractual agreement with HyClone and orders all
supplies using purchase orders. The Company solicited price quotations from
several vendors before choosing HyClone as its supplier, and if HyClone is
unable or unwilling to supply the Company in the future, the Company would need
to repeat its search for a supplier. This search could delay or hamper
development and manufacture of the Company's products. There can be no assurance
that Anergen will be able to continue its relationship with HyClone on
acceptable terms or that it would be able to find an alternative supplier should
their relationship discontinue.
 
LACK OF MARKETING EXPERIENCE; DEPENDENCE ON THIRD PARTIES
 
     The Company currently has no sales, marketing or distribution capability.
The Company intends to rely on relationships with one or more pharmaceutical
companies with established distribution systems and direct sales forces to
market its products. In the event that the Company is unable to reach agreement
with one or more pharmaceutical companies to market its products, it may be
required to market its products directly and to develop a marketing and sales
force with technical expertise and supporting distribution capability. There can
be no assurance that the Company will be able to establish in-house sales and
distribution capabilities or relationships with third parties, or that it will
be successful in gaining market acceptance for its products. To the extent that
the Company decides to utilize existing or future co-promotion or other
licensing arrangements, the Company must develop its own sales, marketing or
distribution capability, and there can be no assurance that such efforts will be
successful. See "Business -- Collaborative Arrangements" and "-- Marketing and
Sales."
 
COMPETITION AND TECHNOLOGICAL CHANGE
 
     The biotechnology and pharmaceutical industries are characterized by
rapidly evolving technology and intense competition. The Company's competitors
include major pharmaceutical, chemical and specialized biotechnology companies,
most of which have financial, technical, research and development,
manufacturing, clinical and marketing resources significantly greater than those
of the Company. The Company believes that these other entities recognize the
need for effective therapies for the autoimmune diseases targeted by the Company
and are highly motivated to develop such therapies. In addition, many
specialized biotechnology companies have formed collaborations with large,
established companies to support research, development and commercialization of
products that may be competitive with those of the Company. Academic
institutions, governmental agencies and other public and private research
organizations are also conducting research activities and seeking patent
protection and may commercialize products on their own or through joint
ventures. The Company is aware of certain products in development by competitors
that are intended to be used for the prevention or treatment of certain diseases
the Company has targeted for product development.
 
                                       11
<PAGE>   14
 
The existence of these products, or other products or treatments of which the
Company is not aware, or products or treatments that may be developed in the
future which may be more effective, may adversely affect the commercialization
or marketability of products which may be developed by the Company or
potentially render the Company's technology obsolete or non-competitive.
 
     The Company's competitive position will depend on its ability to attract
and retain qualified scientific and other personnel, develop effective
proprietary products, implement production and marketing plans, obtain patent
protection and secure adequate capital resources. In addition, the first
pharmaceutical product to reach the market in a therapeutic or preventive area
is often at a significant competitive advantage relative to later entrants to
the market. The Company expects its products, if approved for sale, to compete
primarily on the basis of product efficacy, safety, patent position,
reliability, price and patient convenience. See "Business -- Competition."
 
UNCERTAINTY RELATED TO PHARMACEUTICAL PRICING AND REIMBURSEMENT
 
     Political, economic and regulatory influences are subjecting the health
care industry in the United States to fundamental change. Initiatives to reduce
the federal deficit and to reform health care delivery are increasing these cost
containment efforts. The Company anticipates that Congress, state legislatures
and the private sector will continue to review and assess alternative benefits,
controls on health care spending through limitations on the growth of private
health insurance premiums and Medicare and Medicaid spending, the creation of
large insurance purchasing groups, price controls on pharmaceuticals and other
fundamental changes to the health care delivery system. Any such proposed or
actual changes could cause existing and potential partners of the Company to
limit or eliminate spending on collaborative development projects. Legislative
debate is expected to continue in the future, market forces are expected to
demand reduced costs and Anergen cannot predict what impact the adoption of any
federal or state health care reform measures or future private sector reforms
may have on its business.
 
     In both domestic and foreign markets, sales of the Company's proposed
products will depend in part upon the availability of reimbursement from
third-party payors, such as government health administration authorities,
private health insurers and other organizations. In addition, other third-party
payors are increasingly challenging the price and cost effectiveness of medical
products and services. Significant uncertainty exists as to the reimbursement
status of newly approved health care products. There can be no assurance that
the Company's potential products or products discovered in collaboration with
the Company will be considered cost-effective or that adequate third-party
reimbursement will be available to enable Anergen to maintain price levels
sufficient to realize an appropriate return on its significant investment in
product research and development. Legislation and regulations affecting the
pricing of pharmaceuticals may change before the Company's proposed products are
approved for marketing. Adoption of such legislation could further limit
reimbursement for medical products. If adequate coverage and reimbursement
levels are not provided by the government and third-party payors for the
Company's products, the market acceptance of these products would be adversely
affected, which would have a material adverse effect on the Company's business,
financial condition and results of operations. See "Business -- Pharmaceutical
Pricing and Reimbursement."
 
DEPENDENCE ON AND NEED FOR ADDITIONAL KEY PERSONNEL; RELIANCE ON ACADEMIC
COLLABORATORS
 
     The success of the Company and of its business strategy is dependent in
large part on the ability of the Company to attract and retain key management
and operating personnel. Such persons are in high demand and are often subject
to competing offers. The Company will need to develop expertise and add skilled
employees or retain consultants in such areas as research and development,
clinical testing, government approvals, marketing and manufacturing in the
future. There can be no assurance that the Company will be able to attract and
retain the qualified personnel or develop the expertise needed for its business.
The loss of the services of one or more of the Company's officers or other
members of the research or management group or the inability to hire additional
personnel and develop expertise as needed would have a material adverse effect
on the Company.
 
                                       12
<PAGE>   15
 
     A significant portion of the Company's research and development and
clinical trials is conducted under sponsored research programs with several
universities. The Company depends on the availability of the principal
investigator for each such program, and the Company cannot assure that these
individuals or their research staffs will be available to conduct research and
development or clinical trials. The Company's academic collaborators are not
employees of the Company. As a result, the Company has limited control over
their activities and can expect that only limited amounts of their time will be
dedicated to Company activities. In addition, the Company's academic
collaborators are employed by major institutions which have collaborative
relationships with other parties, some of which may be competitors of the
Company. Accordingly, there can be no assurance that research and development,
preclinical and clinical testing performed by these collaborators will be
completed in a timely manner, if at all, and any inability to do so could have a
material adverse effect on the Company.
 
POTENTIAL PRODUCT LIABILITY
 
     The testing, marketing and sale of human health care products entail an
inherent risk of exposure to product liability claims in the event that the use
of the Company's technology or prospective products is alleged to have resulted
in adverse effects. While the Company has taken, and will continue to take, what
it believes are appropriate precautions to minimize exposure to product
liability, there can be no assurance that it will avoid significant liability.
The Company possesses limited general liability and product liability insurance
related to its clinical trials of AnervaX for RA and intends to seek such
insurance related to its clinical trials of AnergiX for MS and certain other
types of insurance customarily obtained by business organizations. There can be
no assurance that the existing insurance coverage is adequate or that it will
avoid liability. The Company intends to seek insurance against product liability
risks associated with the testing, manufacturing or marketing of its products.
However, there can be no assurance that it will be able to obtain such insurance
in the future, or that if obtained, such insurance will be sufficient in amount.
Consequently, a product liability claim or other claims with respect to
uninsured liabilities or in excess of insured liabilities could have a material
adverse effect on the business or financial condition of the Company.
 
HAZARDOUS MATERIALS; ENVIRONMENTAL MATTERS
 
     The Company is subject to regulation by the Occupational Safety and Health
Administration ("OSHA") and the Environmental Protection Agency ("EPA") and to
regulation under the Toxic Substances Control Act, the Resource Conservation and
Recovery Act and other regulatory statutes, and may in the future be subject to
other federal, state or local regulations. Although the Company believes that it
has complied with these laws, regulations and policies in all material respects
and has not been required to take any significant action to correct any material
noncompliance, there can be no assurance that the Company will not be required
to incur significant costs to comply with environmental and health and safety
regulations in the future. The Company's research and development involves the
controlled use of hazardous materials, including but not limited to certain
hazardous chemicals and radioactive materials. Although the Company believes
that its safety procedures for handling and disposing of such materials comply
with the standards prescribed by state and federal regulations, the risk of
accidental contamination or injury from these materials cannot be eliminated. In
the event of such an accident, the Company could be held liable for any damages
that result and any such liability could exceed the resources of the Company. In
addition, regulations may be promulgated governing biotechnology that may affect
the Company's research and development programs. The Company is unable to
predict whether any agency will adopt any regulation which would have a material
adverse effect on the Company's business, financial condition and results of
operations.
 
VOLATILITY OF STOCK PRICE
 
     The market price of the Company's Common Stock, similar to the securities
of other biotechnology companies, has been and is likely to continue to be
highly volatile. Announcements regarding the results of regulatory approval
filings, clinical trials or other testing, technological innovations or new
commercial products by the Company or its competitors, patents and intellectual
property rights by the Company or its competitors, developments as to current or
future collaborations by the Company or its competitors,
 
                                       13
<PAGE>   16
 
government regulations, the status of health care reform initiatives,
fluctuations in operating results, changes in recommendations by financial
analysts, and general market conditions for biotechnology stocks could have a
significant impact on the future price of the Common Stock. Trading volume of
the Company's Common Stock has been relatively limited and sales of substantial
amounts of Common Stock could have an adverse effect on the price of the Common
Stock. See "Price Range of Common Stock."
 
CONTROL BY EXISTING STOCKHOLDERS
 
     Upon completion of the offering, the Company's officers, directors and
principal shareholders, namely Warburg, Pincus Ventures, L.P. ("Warburg"),
International Biotechnology Trust PLC ("IBT"), and Novo Nordisk, collectively
will beneficially own approximately 47.0% of the Company's outstanding Common
Stock, or approximately 45.6% if the Underwriters' over-allotment option is
exercised in full. Under a March 1995 common stock purchase agreement with
Warburg and IBT ("Warburg/IBT Purchase Agreement"), the Company is currently
obligated to include in the slate of nominees recommended by the Company's Board
of Directors and management, at each election of directors, two candidates
selected by Warburg, one candidate selected by IBT and one candidate mutually
agreed to by IBT and Warburg. In addition, pursuant to an August 1993 common
stock purchase agreement with Novo Nordisk entered into in connection with the
Novo Nordisk collaboration, the Company is similarly obligated to include in its
slate of nominees, at each election of directors, one candidate selected by Novo
Nordisk. The ownership of the Company's Common Stock, and the ability to
designate candidates for the Company's recommended slate of nominees for the
Board of Directors, of Warburg, IBT and Novo Nordisk will enable such
shareholders to have significant influence over major corporate transactions as
well as the election of directors of the Company and control over board
decisions and could have the effect of delaying, deterring or preventing a
change in control of the Company. See "Principal Stockholders" and "Description
of Capital Stock."
 
SHARES ELIGIBLE FOR FUTURE SALE; REGISTRATION RIGHTS
 
     Sales of significant amounts of the Company's Common Stock in the public
market after this offering by other shareholders and option and warrant holders
could adversely affect the market price of the Company's Common Stock. Upon the
completion of this offering, the Company will have 19,066,042 shares of Common
Stock outstanding, assuming no exercise of outstanding options or warrants after
May 31, 1996. Approximately 18,652,077 shares (including the 4,000,000 shares
sold in this offering) of Common Stock are eligible for immediate sale in the
public market without restriction unless they are subject to lockup agreements
or held by "affiliates" of the Company within the meaning of Rule 144 ("Rule
144") of the Securities Act of 1933, as amended (the "Securities Act"), although
shares held by persons who may be deemed affiliates are subject to volume
restrictions applicable to affiliates under Rule 144. As of May 31, 1996,
8,786,074 shares were held by persons who may be deemed affiliates under Rule
144. In addition, 1,279,815 shares of Common Stock were subject to options
outstanding as of May 31, 1996, and 451,300 of these shares were fully vested.
Upon exercise of the currently vested portion of such options, all shares will
be eligible for immediate sale in the public market, subject to Rule 144 volume
restrictions applicable to affiliates or lockup agreements, if applicable. As of
May 31, 1996, there were 459,015 shares of Common Stock subject to warrants
which, upon exercise of such warrants, may be freely tradeable pursuant to Rule
144 or as a result of registration pursuant to registration rights. The Company
and each of its officers, directors and 5% or greater stockholders have agreed
not to sell or otherwise dispose of Common Stock of the Company for a 90-day
period following the effective date of the Registration Statement of which this
Prospectus is a part. The Commission has recently proposed to reduce the Rule
144 holding periods. If enacted, such modification will have a material effect
on the timing of when shares of the Company's Common Stock become eligible for
resale. Further, certain shareholders have the right, subject to certain
conditions, to participate in future Company registrations and to cause the
Company to register certain Common Stock owned by them. See "Description of
Capital Stock" and "Shares Eligible for Future Sale."
 
                                       14
<PAGE>   17
 
ABSENCE OF DIVIDENDS; DILUTION
 
     The Company has never paid any cash dividends and does not anticipate
paying cash dividends in the foreseeable future. Purchasers of the Common Stock
offered hereby will experience immediate and substantial dilution in the amount
of $3.50 in net tangible book value per share. Additional dilution will occur
upon exercise of outstanding stock options and warrants. See "Dividend Policy"
and "Dilution."
 
ANTI-TAKEOVER PROVISIONS; POSSIBLE ISSUANCE OF PREFERRED STOCK OR ACCELERATION
OF OPTION VESTING
 
     The Board of Directors has authority, without further action by
shareholders, to issue up to 10,000,000 shares of Preferred Stock with rights,
preferences and privileges designated by the Board of Directors. This Preferred
Stock could be issued quickly with terms calculated to delay or prevent a change
in control of the Company or to make removal of management more difficult. In
certain circumstances, such issuance could have the effect of decreasing the
market price of the Common Stock or of delaying, deterring or preventing a
change in control of the Company. The Company has no present plan to issue any
shares of Preferred Stock. Further, pursuant to the Company's option plans, in
the event of certain mergers of the Company with other entities, transfers of
voting control of the Company's capital stock or sale of all or substantially
all of the Company's assets, the Company's Board of Directors has the right
under certain circumstances to cause all outstanding options to become fully
vested prior to the event causing such acceleration and all unexercised options
will terminate upon completion of such event. See "Management -- Employment
Agreements and Change of Control Arrangements."
 
                                       15
<PAGE>   18
 
                                USE OF PROCEEDS
 
     The net proceeds to the Company from the sale of the shares of Common Stock
offered hereby are estimated to be approximately $18.3 million ($21.1 million if
the Underwriters' over-allotment option is exercised in full) assuming an
offering price of $5.00 per share and after deducting underwriting discounts and
commissions and estimated offering expenses.
 
     The Company expects to use the net proceeds from this offering for working
capital and general corporate purposes, including research and development,
clinical trials, hiring additional technical personnel, acquiring capital
equipment, and expanding manufacturing capabilities. The Company anticipates
that its current cash and short-term investments and expected revenues under its
collaborations, combined with the estimated net proceeds of this offering, will
be sufficient to fund its operations for at least two years. Consistent with its
past allocation of expenses, the Company intends to spend approximately 80% (or
approximately $14.6 million) of the net proceeds of this offering on research
and development related activities, and approximately 20% (or approximately $3.7
million) of such proceeds on general and administrative activities. The research
and development expenditures will be allocated principally to the Company's
ongoing Phase II clinical trials of AnervaX for RA; manufacturing of GMP grade
material for the Phase I clinical trial of the Company's AnergiX for MS and the
conduct of such clinical trial; research activities in its core AnervaX and
AnergiX technologies to further current programs in RA, MS, IDDM and MG and to
develop programs in other autoimmune diseases; and support of research
activities in academic institutions. The foregoing forward-looking statements
involve risks and uncertainties that could cause actual results to differ
materially. In particular, the Company has not identified precisely the amounts
it plans to spend on its various programs for production capabilities,
facilities, or working capital and general corporate purposes. The use of
proceeds is subject to change based upon the progress of the Company's research
and development programs, manufacturing activities, the progress of the
Company's clinical programs, the results of laboratory testing, the time and
cost required to seek regulatory approvals to commence clinical trials for the
Company's initial products, the need to obtain licenses to other proprietary
rights, any required adjustments to the Company's operating plan to respond to
competitive pressures or technological advances, developments with respect to
the Company's existing or future collaborative arrangements and the availability
of various methods of financing. The Company reserves the right at the
discretion of its Board of Directors to reallocate its use of proceeds of this
offering in response to these and other factors. See "Risk Factors -- Future
Requirement for Significant Additional Capital", "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and
"Business -- Collaborative Arrangements."
 
     Pending such uses, the Company intends to invest the net proceeds of the
offering in high-grade, interest-bearing financial instruments.
 
                                DIVIDEND POLICY
 
     The Company has not declared or paid any dividends since its inception and
does not intend to pay any dividends in the foreseeable future. In addition,
there are restrictions imposed upon the Company's ability to pay cash dividends
under certain of the Company's credit arrangements.
 
                                       16
<PAGE>   19
 
                                 CAPITALIZATION
 
     The following table sets forth the capitalization of the Company as of
March 31, 1996, and as adjusted as of such date to reflect the receipt of the
estimated net proceeds from the sale of the 4,000,000 shares of Common Stock
offered hereby (after deducting the underwriting discounts and commissions and
estimated offering expenses). See "Use of Proceeds."
 
<TABLE>
<CAPTION>
                                                                             MARCH 31, 1996
                                                                        ------------------------
                                                                                         AS
                                                                         ACTUAL      ADJUSTED(1)
                                                                        --------     -----------
                                                                             (IN THOUSANDS)
<S>                                                                     <C>          <C>
Long-term portion of capital lease obligations and debt...............  $    636      $     636
                                                                        --------       --------
Shareholders' equity:
  Preferred Stock: no par value, 10,000,000 shares authorized; none
     outstanding......................................................        --             --
  Common Stock: no par value, 40,000,000 shares, authorized;
     15,029,430 shares issued and outstanding and: 19,029,430 shares
     issued and outstanding as adjusted(2)(3).........................    47,400         65,700
  Additional paid-in capital..........................................       648            648
  Unrealized loss on investments......................................       (18)           (18)
  Accumulated deficit.................................................   (37,840)       (37,840)
                                                                        --------       --------
          Total shareholders' equity..................................    10,190         28,490
                                                                        --------       --------
Total capitalization..................................................  $ 10,826      $  29,126
                                                                        ========       ========
</TABLE>
 
- ---------------
(1) Assumes net proceeds of approximately $18.3 million from this offering based
    on an assumed offering price of $5.00 per share.
 
(2) See Note 6 to Financial Statements.
 
(3) As adjusted shares include 4,000,000 shares of Common Stock to be issued on
    the closing of this offering. Excludes 825,815 shares issuable upon exercise
    of stock options outstanding under the Company's 1988 Stock Plan, 20,000
    shares issuable upon exercise of options outstanding under the Company's
    1995 Director Option Stock Plan and 459,015 shares issuable upon exercise of
    warrants outstanding as of March 31, 1996. Subsequent to March 31, 1996,
    additional options for 434,000 shares were granted and options for 681
    shares were exercised. See "Management -- Incentive Stock Plans" and Note 6
    to Financial Statements.
 
                          PRICE RANGE OF COMMON STOCK
 
     The Company's Common Stock is traded on the Nasdaq National Market under
the symbol "ANRG". The following table sets forth, for the periods indicated,
the range of low and high sale prices for the Company's Common Stock as reported
on the Nasdaq National Market since January 1, 1994:
 
<TABLE>
<CAPTION>
                                                                        LOW      HIGH
                                                                       -----     -----
        <S>                                                            <C>       <C>
        1994
          First Quarter..............................................  $4.25     $7.00
          Second Quarter.............................................   3.25      5.50
          Third Quarter..............................................   3.00      5.25
          Fourth Quarter.............................................   1.88      3.75
        1995
          First Quarter..............................................  $1.75     $4.00
          Second Quarter.............................................   2.13      4.13
          Third Quarter..............................................   3.13      5.50
          Fourth Quarter.............................................   2.63      5.50
        1996
          First Quarter..............................................  $3.34     $4.50
          Second Quarter (through June 27, 1996).....................   3.13      6.34
</TABLE>
 
     As of May 31, 1996 there were approximately 375 holders of record of the
Company's Common Stock. On June 27, 1996, the last sale price reported on the
Nasdaq National Market for the Company's Common Stock was $4.63 per share. See
"Risk Factors -- Volatility of Stock Price."
 
                                       17
<PAGE>   20
 
                                    DILUTION
 
     The net tangible book value of the Company as of March 31, 1996 was
$10,190,000 or approximately $0.68 per share of Common Stock. Net tangible book
value per share is determined by dividing the net tangible book value (tangible
assets less total liabilities) by the number of shares of Common Stock
outstanding at that date. After giving effect to the receipt of the net proceeds
from the sale of the 4,000,000 shares of Common Stock offered hereby at the
estimated offering price of $5.00 per share, the pro forma net tangible book
value of the Company as of March 31, 1996 would have been approximately
$28,490,000 or $1.50 per share of Common Stock. This represents an immediate
increase in net tangible book value of $0.82 per share to existing shareholders
and an immediate dilution of $3.50 per share to purchasers of Common Stock in
this offering. The following table illustrates this per share dilution:
 
<TABLE>
    <S>                                                                 <C>        <C>
    Public offering price per share(1)................................             $  5.00
                                                                                   -------
      Net tangible book value per share before the offering...........    0.68
      Increase per share attributable to new investors................    0.82
                                                                        ------
    Pro forma net tangible book value per share after the offering....                1.50
                                                                                   -------
    Dilution per share to new investors...............................             $  3.50
                                                                                   =======
</TABLE>
 
- ---------------
(1) Before deducting the underwriting discounts and commissions and estimated
    offering expenses payable by the Company.
 
                                       18
<PAGE>   21
 
                            SELECTED FINANCIAL DATA
 
     The selected financial data set forth below with respect to the Company's
statements of operations for each of the three years in the period ended
December 31, 1995, and for the Company's balance sheets at December 31, 1994 and
1995, are derived from the Company's financial statements that have been audited
by Ernst & Young LLP, independent auditors, which are included elsewhere in this
Prospectus and are qualified by reference to such financial statements. The
balance sheet data as of December 31, 1991, 1992, and 1993 and the statements of
operations data for the years ended December 31, 1991 and 1992 have been derived
from the Company's audited financial statements which are not included herein.
The selected financial data at March 31, 1996 and for the three months ended
March 31, 1995 and 1996 are derived from the unaudited financial statements
included elsewhere in this Prospectus. The unaudited financial statements
include all adjustments, consisting only of normal recurring adjustments, which
the Company considers necessary for a fair presentation of its financial
position and results of operations for those periods. Operating results for the
three months ended March 31, 1996 are not necessarily indicative of the results
that may be expected for the full year ending December 31, 1996. The data set
forth below should be read in conjunction with the financial statements and the
notes related thereto.
 
<TABLE>
<CAPTION>
                                                                                                THREE MONTHS
                                                                                                    ENDED
                                                       YEARS ENDED DECEMBER 31,                   MARCH 31,
                                            -----------------------------------------------   -----------------
                                             1991      1992      1993      1994      1995      1995      1996
                                            -------   -------   -------   -------   -------   -------   -------
                                                           (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                         <C>       <C>       <C>       <C>       <C>       <C>       <C>
STATEMENTS OF OPERATIONS DATA:
Revenues:
  Contract revenues -- related party......  $    --   $    --   $   339   $ 2,325   $ 3,001   $   551   $   783
  Interest income.........................      163       544       312       207       533        17       139
                                            -------   -------   -------   -------   -------   -------   -------
         Total revenues...................      163       544       651     2,532     3,534       568       922
Expenses:
  Research and development................    2,696     4,525     5,553     7,423     8,322     1,898     1,895
  General and administrative..............    1,218     1,494     1,716     1,831     1,976       462       503
  Interest expense........................      142        78       226       238       322        71        55
                                            -------   -------   -------   -------   -------   -------   -------
         Total expenses...................    4,056     6,097     7,495     9,492    10,620     2,431     2,453
                                            -------   -------   -------   -------   -------   -------   -------
Net loss..................................  $(3,893)  $(5,553)  $(6,844)  $(6,960)  $(7,086)  $(1,863)  $(1,531)
                                            =======   =======   =======   =======   =======   =======   =======
Net loss per share........................  $ (0.96)  $ (0.99)  $ (1.12)  $ (0.97)  $ (0.55)  $ (0.25)  $ (0.10)
                                            =======   =======   =======   =======   =======   =======   =======
Shares used in calculating per share
  data(1).................................    4,059     5,599     6,118     7,202    12,859     7,527    14,984
                                            =======   =======   =======   =======   =======   =======   =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                             DECEMBER 31,
                                            -----------------------------------------------       MARCH 31,
                                             1991      1992      1993      1994      1995           1996
                                            -------   -------   -------   -------   -------   -----------------
                                                                      (IN THOUSANDS)
<S>                                         <C>       <C>       <C>       <C>       <C>       <C>       <C>
BALANCE SHEET DATA:
  Cash, equivalents and short-term
    investments...........................  $13,655   $ 8,918   $ 9,585   $ 3,756   $11,492             $ 9,653
  Total assets............................   14,350    10,724    11,763     6,797    14,455              12,461
  Long-term portion of capital lease
    obligations and debt..................      241     1,112       956       990       818                 636
  Total shareholders' equity..............   13,188     7,857     9,251     3,870    11,714              10,190
</TABLE>
 
- ---------------
(1) Based on the number of shares outstanding for each applicable period.
    Excludes employee stock options, director stock options and warrants
    outstanding on March 31, 1996, for 825,815, 20,000 and 459,015 shares of
    Common Stock, respectively, at weighted average exercise prices of $5.28,
    $3.72 and $4.85 per share, respectively. In addition, 37,341 shares were
    reserved for issuance under the Company's 1992 Consultant Stock Plan. See
    "Management -- Incentive Stock Plans" and "Description of Capital Stock."
 
                                       19
<PAGE>   22
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     The following discussion of the financial condition and results of
operations of Anergen, Inc. should be
read in conjunction with the Financial Statements and related Notes thereto
included elsewhere in this Prospectus. This Prospectus contains forward-looking
statements which involve risks and uncertainties. The Company's actual results
could differ materially from the results anticipated in these forward-looking
statements. Factors that might cause such a difference include, but are not
limited to, those discussed herein and in "Risk Factors" and "Business" as well
as elsewhere in this Prospectus.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     To date, the Company has financed its operations primarily through private
placements of its equity securities with venture capitalists (which raised an
aggregate of approximately $7.6 million in net proceeds), through an initial
public offering of its Common Stock in October of 1991 (which raised
approximately $14.2 million in net proceeds), through the sale of its Common
Stock to Novo Nordisk, in August of 1993 (which raised approximately $8 million
in net proceeds), and in June, 1994 through the issuance of 413,965 shares of
Common Stock and Warrants to purchase an additional 236,863 shares of Common
Stock at an exercise price of $3.52 per share through a private placement to two
purchasers in exchange for $1.5 million in proceeds. In April 1995 the Company
issued 7,317,073 shares of the Company's Common Stock to two new investors in
exchange for approximately $14.7 million in net proceeds. At March 31, 1996, the
Company's cash and short-term investments were approximately $9.7 million and
the Company had shareholders' equity of approximately $10.2 million. As of March
31, 1996 the Company had net borrowings of $1.4 million under three loan
agreements. Lease lines and loans have been and will continue to be used by the
Company to the extent that their terms are commercially attractive; however,
there can be no assurance that additional borrowing facilities will be
available. No amounts were available under debt or lease lines at March 31,
1996. At March 31, 1996 the Company had no material commitments for capital
expenditures.
 
     The Company anticipates that its current cash, short-term investments and
expected revenues under its collaborations, combined with the estimated net
proceeds of this offering, will be sufficient to fund the Company's operations
for at least two years. The Company anticipates that its current resources will
be primarily used to fund clinical testing of AnervaX for RA, and continued
research and development and preparation for clinical testing of AnergiX for the
treatment of IDDM and MG and additional research and development. The balance of
such resources will be used to fund continued limited research on other
autoimmune diseases and general and administrative activities, including those
associated with seeking collaborative arrangements to enable the Company to
increase its research and development activities in other autoimmune diseases.
The foregoing forward-looking statements involve risks and uncertainties that
could cause actual results to differ materially. In particular, the Company's
capital requirements will vary depending upon numerous factors many of which are
outside the Company's control. These factors include the progress of the
Company's research and development programs, manufacturing activities, the
progress of the Company's clinical programs, the results of laboratory testing,
the time and cost required to seek regulatory approvals to commence clinical
trials for the Company's initial products, the need to obtain licenses to other
proprietary rights, any required adjustments to the Company's operating plan to
respond to competitive pressures or technological advances, developments with
respect to the Company's existing or future collaborative arrangements, and the
availability of various methods of financing. The Company expects to seek to
raise additional capital through equity or debt financing, research and
development collaborations with corporate partners or through other sources. Any
additional equity financing may be dilutive to shareholders, and debt financing,
if available, may involve restrictions on stock dividends and other restrictions
on the Company. Adequate funds for the Company's operations, whether from equity
or debt, collaborative or other arrangements with corporate partners or from
other sources, may not be available when needed or on terms attractive to the
Company. Insufficient funds may require the Company to delay, scale back or
eliminate some or all of its research and product development programs or to
license third parties to commercialize products or technologies that the Company
would otherwise seek to develop itself. The Company's liquidity will be reduced
as amounts are expended for continuing research and development.
 
                                       20
<PAGE>   23
 
RESULTS OF OPERATIONS
 
     Since its inception, the Company has engaged entirely in research and
development activities. The Company has been unprofitable to date, has generated
only limited revenues and expects to incur substantial and increasing net losses
over at least the next several years due to continued and expanded requirements
for research and development, laboratory testing, clinical trials, manufacturing
and regulatory activities. For the period from its inception through March 31,
1996, the Company has incurred a cumulative deficit of approximately $37.8
million.
 
     Years Ended December 31, 1995, 1994 and 1993
 
     The Company's net losses increased to $7.1 million in 1995 from $7.0
million in 1994 and from $6.8 million in 1993. The Company expects to incur
substantial and increasing net losses for at least the next several years. The
Company's total expenses increased to $10.6 million in 1995 from $9.5 million in
1994 and $7.5 million in 1993. In 1995, increased expenses were substantially
offset by contract revenues totaling approximately $3.0 million from its
corporate partner.
 
     The Company began earning contract revenues in the fourth quarter of 1993
under the collaborative agreement with the Company's corporate partner, Novo
Nordisk. Contract revenues represent reimbursement of certain research and
development costs and totaled $3.0 million in 1995 compared with $2.3 million
for fiscal 1994 and $339,000 in 1993.
 
     Research and development expenses increased to $8.3 million in 1995 from
$7.4 million in 1994 and $5.6 million in 1993. The 12% increase from 1994 to
1995 was primarily due to clinical trial costs for the Phase I trial for the
Company's AnervaX product for RA, preclinical costs associated with the
Company's filing of an IND for its AnergiX product for MS and increased
activities related to the Company's research project involving IDDM. The 34%
increase from 1993 to 1994 was due primarily to the initiation of clinical
trials for the Company's AnervaX product for RA and increased activities related
to preparation for filing an IND for the Company's AnergiX product for MS. The
Company expects research and development spending to continue to increase during
the next several years.
 
     General and administrative expenses were approximately $2.0 million, $1.8
million and $1.7 million in 1995, 1994 and 1993, respectively. These increases
were due to adding personnel and providing necessary business, administrative
and finance resources to support increased research and development activities.
The Company expects to incur higher general and administrative expenses in the
next several years to support its expanded research and development efforts and
to pursue strategic relationships and continued funding for the Company's
operations.
 
     In 1995 interest income rose to $533,000 due to an increase in cash and
short term investment balances resulting from proceeds received from the
follow-on financing completed in April 1995. Interest income fell to $207,000 in
1994 from $312,000 in 1993 due to decreasing cash and short-term investment
balances. Interest expense increased in 1995 to $322,000 due to debt financing
of the Company's facility expansion and addition of laboratory equipment.
Interest expense rose to $238,000 in 1994 from $226,000 in 1993 due to debt
financing related to the improvement of facilities and the purchase of
additional equipment.
 
     At December 31, 1995, the Company had federal and state net operating loss
carryforwards of approximately $33.7 million and $16.6 million, respectively,
which expire in varying amounts through 2010. The Company's stock offering in
April 1995 resulted in a change in ownership for tax purposes and it is expected
that the entire net operating loss and credit carryforwards will be subject to
an annual limitation based on the Company's pre-change value. The annual
limitation will result in the expiration of the net operating losses and credits
before utilization. See Note 8 to Financial Statements.
 
                                       21
<PAGE>   24
 
     Three Months Ended March 31, 1996 and 1995
 
     The Company's net loss decreased 18% to $1,531,000 in the fiscal quarter
ended March 31, 1996 compared to a $1,863,000 loss in the corresponding period
in the previous year due to increases in contract revenues and interest income
of $232,000 and $122,000, respectively. The Company's contract revenues relate
to its collaborative agreement with Novo Nordisk. Total expenses increased
slightly to $2,453,000 from $2,431,000. The Company expects total operating
expenses to increase as it increases research and development efforts,
laboratory testing, clinical trials, manufacturing and regulatory activities.
 
     Research and development expenses decreased slightly to $1,895,000 for the
quarter ended March 31, 1996 from $1,898,000 in the corresponding period in the
previous year. In 1996, research and development costs relate to preparation for
Phase II clinical trials for AnervaX for RA and for a Phase I trial of AnergiX
for MS and to increased research activities in the IDDM program. In 1995, these
costs related primarily to the initiation of clinical trials of AnervaX for RA
and research activities in preparation of filing an IND for AnergiX for MS.
 
     General and administrative expenses increased 9% to $503,000 for the
quarter ended March 31, 1996 compared to $462,000 in the corresponding period in
the previous year primarily due to increased corporate development activities.
 
     Interest income increased to $139,000 for the quarter ended March 31, 1996
as compared to interest income of $17,000 in the corresponding period in the
previous year due to increased cash and short-term investment balances primarily
due to the sale of Common Stock to new investors in April 1995. Interest expense
decreased to $55,000 for the quarter ended March 31, 1996 as compared to
interest expense of $71,000 in the corresponding period in the previous year due
to a lower debt balance. Interest income is expected to increase as a result of
the temporary investment of the net proceeds of this offering and to decline
gradually as invested capital is used for operating activities.
 
                                       22
<PAGE>   25
 
                                    BUSINESS
 
     This Prospectus contains certain forward-looking statements which involve
risks and uncertainties. The Company's actual results could differ materially
from the results anticipated in these forward-looking statements as a result of
certain factors set forth herein and those discussed in "Risk Factors" and
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" as well as elsewhere in this Prospectus.
 
GENERAL
 
     The Company is focused on the treatment of autoimmune diseases through the
discovery and development of proprietary therapeutics that selectively interrupt
the disease process. Anergen's current research and development efforts are
focused on two distinct core technologies, AnergiX and AnervaX, that the Company
believes may be used to treat a broad range of autoimmune diseases without
generally suppressing the immune system. Patient selection has begun for a Phase
I clinical trial of the Company's AnergiX compound for the treatment of MS and
the Company has initiated a Phase II clinical trial of its AnervaX compound for
the treatment of RA. Since 1993, the Company has collaborated with Novo Nordisk
in the development of AnergiX treatments for MS, IDDM and MG. In June 1996, the
Company announced a collaborative agreement with Organon to develop an AnergiX
treatment for RA.
 
     In the body's immune system, T cells normally regulate the identification
and destruction of foreign substances and malignant cells. Autoimmune diseases
are caused by abnormal destruction of healthy body tissues by disease-specific T
cells. Anergen's results to date suggest that treatments based on its core
technologies may interrupt the chain of events fundamental to the onset and
continuation of certain autoimmune diseases. The Company's AnergiX technology
selectively destroys or inactivates (anergizes) the T cells implicated in the
disease process. Its second core technology, AnervaX, stimulates the immune
system to produce antibodies that block the presentation of self-antigens to
destructive T cells. The Company believes that, because its potential
therapeutics target only disease-specific T cells, the normal function of the
immune system should remain unaffected. In contrast, currently available
therapies for autoimmune diseases treat only the symptoms of the disease or
broadly suppress the immune system, which can compromise the ability of the
immune system to protect against foreign substances.
 
     Anergen received IND clearance in December 1995 with the FDA to begin Phase
I clinical testing of its AnergiX compound for the treatment of MS. In
preclinical studies, the administration of an AnergiX compound prevented or
reduced disease symptoms caused by the T cell initiated autoimmune response in
animal models. The Company has also demonstrated in vitro that its AnergiX
compound can inactivate human T cells associated with MS. The Company is
collaborating with Novo Nordisk on the development of this compound.
 
     In April 1996, the Company initiated a multicenter, double-blind,
placebo-controlled Phase II clinical trial of its AnervaX compound for the
treatment of RA. The results of a Phase I clinical trial completed in October
1995 indicated that AnervaX is well tolerated and can stimulate an immune
response in RA patients. Preclinical results have also demonstrated that the
Company's AnervaX approach may prevent the onset or reduce the severity of
autoimmune disease in animal models.
 
     The Company entered into a collaborative agreement with Novo Nordisk in
August 1993 under which Novo Nordisk, in exchange for certain marketing rights,
will support research and development of the Company's MS, MG and IDDM programs,
make milestone payments, and pay royalties on product sales, if any. The Company
has the right to co-promote any resultant products for MS and MG in North
America. In addition, at the time of the agreement Novo Nordisk made an $8
million equity investment in the Company. In March 1996, the development program
with Novo Nordisk was extended through August 1998, increasing total funds
expected to be received by the Company under the collaboration from $25 million
to $35 million. These amounts do not include the cost of clinical trials that
will be borne directly by Novo Nordisk.
 
     In June 1996, the Company entered into a collaborative agreement with
Organon under which Organon, in exchange for certain marketing rights, will
support research and development of an AnergiX compound to treat RA that
incorporates a proprietary peptide discovered by Organon. Under the arrangement,
Organon will also pay the Company a one-time license fee, make milestone
payments and pay royalties on product sales, if any. The license fee, research
and development support and milestone payments that the Company may receive
under this agreement are estimated to exceed $15 million. These amounts do not
include the cost of clinical trials that will be borne directly by Organon.
 
                                       23
<PAGE>   26
 
AUTOIMMUNE DISEASES
 
     Background.  Normally, the immune system recognizes and distinguishes
between invading foreign substances or "antigens" and the body's own tissue. The
body is able to react continually to a wide variety of antigens, to remember a
foreign substance to which it has been exposed previously, and to rid itself of
a foreign substance. The ability of the immune system to distinguish between its
own tissue (self) and foreign substances is essential for its normal function.
 
     The recognition and memory processes of the immune system are controlled by
the activity of several types of cells. One of the most important, the "T cell,"
plays a critical role in recognizing antigens, initiating an immune response and
regulating the resulting cascade of immunological events. Another type of cell,
the "B cell," secretes antibodies that are involved in the recognition and
neutralization of antigens. These processes require the involvement of proteins
called human leukocyte antigen ("HLA") molecules which are found on the surface
of certain cells in the body. The HLA molecules are encoded by a gene complex
called MHC. The terms HLA and MHC are sometimes used interchangeably.
 
     When a foreign substance enters the body, antigen presenting cells, which
act as scavenger cells, encounter and engulf the foreign substance. These
scavenger cells break down the antigen into smaller components called
"peptides." The antigen presenting cell then transports each individual peptide,
called an "epitope," bound to the MHC molecules as a complex, to its outer cell
membrane where it is presented to various T cells. Once a responsive T cell is
stimulated, it initiates an immune response that eliminates the foreign
substance from the body. T cells recognize specific MHC-epitope complexes
through receptors on their surfaces, with each type of T cell recognizing only
one out of millions of possible MHC-epitope complexes. There are several classes
of MHC molecules, with MHC Class II ("MHC II") molecules involved in the
presentation of self-antigens.
 
     While the immune system is normally extremely efficient in seeking and
destroying foreign substances, in some cases, for reasons that are not yet
understood, the immune system is triggered to begin destroying the body's own
healthy tissue, resulting in autoimmune diseases such as RA, MS, IDDM and MG. In
these diseases, "self" tissue is presented to T cells which respond by
initiating an immune response that destroys healthy tissue. For example, T cells
are involved in the destruction of nerve structures in MS, joint tissue in RA,
and insulin-producing (LOGO)b cells in IDDM.
 
     Existing Therapeutic Approaches.  Traditional therapies for autoimmune
diseases include steroids and other immunosuppressive drugs that generally treat
the symptoms rather than the cause of the disease and are unable to prevent the
activation of T cells that initiate the destructive autoimmune response. Current
treatments are typically administered based on disease severity. For mild forms
of these diseases, drugs that ameliorate the symptoms may be given. These drugs
do not prevent the progression of tissue destruction and are relatively
ineffective in treating more severe symptoms. In advanced disease stages, more
powerful immunosuppressive drugs are used to suppress the body's entire immune
system. This has some therapeutic effect, but also limits the body's ability to
respond to invading foreign substances, which substantially increases the risk
of contracting other illnesses. In addition, such drugs generally have numerous
other unwanted and often severe side effects.
 
ANERGEN TECHNOLOGY
 
     The Company's technology programs focus on the discovery and development of
proprietary therapeutics that destroy or inactivate T cells involved in the
disease process or selectively interrupt antigen presentation to the T cells
without affecting the protective functions of the immune system. Anergen
believes that its approaches to preventing or arresting autoimmune diseases may
result in therapies that are more specific and have fewer side effects than
currently available treatments. The two core technologies, AnergiX and AnervaX,
under development by the Company are summarized below and are illustrated on the
inside cover of this Prospectus.
 
     AnergiX Technology.  The Company's AnergiX technology is currently being
used to develop products for MS, RA, IDDM and MG. An AnergiX compound consists
of an epitope of the self-antigen that would
 
                                       24
<PAGE>   27
 
normally be associated with triggering an autoimmune response in a particular
disease, combined with a soluble MHC II molecule. The AnergiX compound thus has
two of the three primary elements associated with the autoimmune response, but
lacks the third element, the antigen presenting cell. It is believed that the
activation of T cells requires not only the initial signal provided by the
binding to the T cell receptor of the MHC-epitope complex which is on the
surface of antigen presenting cells, but also a "second signal" provided by the
antigen presenting cell itself. Anergen believes that the binding of its AnergiX
compound to the receptor site on the destructive T cell, in the absence of the
antigen presently cell and its "second signal," inactivates that T cell. This
inactivated or nonresponsive state is referred to as a state of "anergy." The
Company believes that by inducing anergy, the autoimmune response can be
interrupted. In addition, the Company has shown that in the presence of AnergiX,
a significant percentage of T cells may undergo apoptosis, or programmed cell
death, which will also serve to interrupt the autoimmune process.
 
     The Company believes, based on its research to date, that the state of
anergy created by the introduction of the Company's AnergiX may last for periods
of up to several months. The results of the Company's research demonstrated that
a state of anergy may also be induced in T cells that have already been
activated, indicating that such T cells could be inactivated even after the
destructive chain reaction has begun. Because the Company believes that its
AnergiX compounds will bind only to T cells specific to a disease, other T cells
are not expected to be affected, and the rest of the immune system should remain
responsive to foreign substances.
 
     AnervaX Technology.  The Company's AnervaX technology is currently being
developed to treat RA. AnervaX is a synthetic peptide vaccine consisting of a
small portion of the MHC II molecule. AnervaX is designed to elicit an immune
response that interferes with the presentation of self-antigens to T cells. This
immune response is intended to stimulate the production of a patient's own
antibodies to a subset of the MHC molecules on the patient's antigen presenting
cells. The Company believes that because AnervaX targets only the subset of MHC
molecules that appear to be involved in the particular autoimmune disease, this
approach potentially will allow the prevention or treatment of autoimmune
disease without generally suppressing the patient's overall immune system.
 
PRODUCTS UNDER DEVELOPMENT
 
     The following table sets forth the current status of Anergen's product
development programs.
- --------------------------------------------------------------------------------
                         ANERGEN'S DEVELOPMENT PROGRAMS
 
<TABLE>
<CAPTION>
                                               PATIENT POPULATION       CORPORATE      DEVELOPMENT
          DISEASE TARGET         TECHNOLOGY      U.S./WORLDWIDE       ALLIANCES(1)      STATUS(2)
   ----------------------------- ----------    -------------------    -------------    -----------
   <S>                           <C>           <C>                    <C>              <C>
   Multiple Sclerosis...........  AnergiX        300,000/650,000      Novo Nordisk     Phase I
   Rheumatoid Arthritis.........  AnervaX      2,500,000/8,000,000         --          Phase II
                                  AnergiX      2,500,000/8,000,000    Organon          Preclinical
   Insulin Dependent Diabetes
     Mellitus...................  AnergiX       600,000/1,800,000     Novo Nordisk     Research
   Myasthenia Gravis............  AnergiX         25,000/50,000       Novo Nordisk     Preclinical
</TABLE>
 
    (1) See "Business -- Collaborative Arrangements" for a discussion of the
        relative rights of the Company and its collaborative partners.
 
    (2) Research: Initiation of research studies.
 
        Preclinical: Identification of a specific molecule for potential
        human testing.
 
        Phase I: Initial phase of human clinical testing to determine safety
        and measure certain biological parameters.
 
        Phase II: Multicenter, double-blind, placebo-controlled clinical
        trial for safety, immunogenicity, dosage determination and initial
        efficacy in a limited patient population.
 
- --------------------------------------------------------------------------------
 
                                       25
<PAGE>   28
 
     Multiple Sclerosis.  MS is a progressive inflammatory disease of the
central nervous system that predominantly affects young adults and causes
increasing neurologic damage and disability throughout life. Symptoms range from
painful facial muscle spasms, vertigo and vomiting to a myriad of motor and
sensory problems. In the United States, the average longevity of patients after
diagnosis with MS is over thirty years. The care of MS patients requires
long-term medical, neurologic and psychological treatment and support. The use
of steroids and immunosuppressant drugs is the most common treatment for MS
today, but these drugs often have significant unwanted side effects such as
nausea and high blood pressure. Based on published data and other sources, the
Company believes that there are approximately 650,000 cases of MS worldwide.
 
     The Company and Novo Nordisk have developed a potential therapeutic,
MS/Anergix, which is a compound of an MHC molecule combined with a peptide
derived from myelin basic protein, the self-antigen believed to be involved in
MS. The Company received IND clearance from the FDA in December 1995 and patient
selection for a Phase I clinical trial has begun. The costs of this and future
trials are fully supported by Novo Nordisk. The Company's preclinical tests
demonstrated that the use of an MS/AnergiX compound prevented or reduced
paralysis caused by the T cell-initiated destructive autoimmune response in an
animal model of MS. Additionally, in vitro testing of MS/AnergiX on human cells
demonstrated inactivation of T cells associated with MS. This study also
indicated that patients' T cells respond to the same antigen over time and that
potentially effective doses appear to be low.
 
     Under the Company's collaborative agreement with Novo Nordisk, Novo Nordisk
will support research and development of the Company's MS program, including the
full cost of all clinical testing, and will pay royalties on worldwide sales of
any resulting products. The Company has retained co-promotion rights in North
America for therapeutics in MS. See "Risk Factors -- Dependence Upon
Collaborative Partners" and "Business -- Collaborative Arrangements -- Novo
Nordisk A/S."
 
     Rheumatoid Arthritis.  RA is a systemic inflammatory disease that causes
joint pain, swelling and, eventually, deformities. Patients afflicted with RA
may experience severe musculoskeletal disability. Over time, progression of the
disease involves degradation and destruction of the surrounding cartilage and
bone. Current treatment of RA involves the use of a variety of drugs in
successive stages: first, with drugs having analgesic actions such as aspirin
and other non-steroidal and anti-inflammatory drugs; second, with agents such as
gold and penicillamine that reduce the symptoms of RA; and third, with drugs
that attempt to contain the disease, including immunosuppressive drugs such as
corticosteroids and methotrexate. Each of these three approaches has side
effects of varying intensity and risks that increase as one moves to the more
aggressive therapies. Based on published data and other sources, the Company
believes that there are approximately 8,000,000 cases of RA worldwide.
 
     The Company completed Phase I clinical testing of its AnervaX peptide
vaccine to treat RA in October 1995 and began Phase II clinical testing in April
1996. Preclinical studies demonstrated that Anergen's AnervaX approach may
prevent the onset of disease and reduce the severity of active disease in
certain animal models of autoimmune disease (experimental allergic
encephalomyelitis and non-obese diabetic ("NOD") mice). In vitro testing
indicated that animals treated with the AnervaX peptide vaccine generate
antibodies against MHC II molecules. The Company believes that such antibodies
bind to MHC II molecules and that this binding may interfere with the
interaction between MHC and T cells that is involved in the progression of
autoimmune disease. The results of the Phase I study showed the vaccine to be
well tolerated and capable of inducing an antibody response.
 
     In addition, the Company is developing an AnergiX compound to treat RA in
conjunction with Organon under an agreement entered into in June 1996. The
compound to be developed uses Anergen's proprietary AnergiX technology and
incorporates a proprietary peptide discovered by Organon. Under the agreement,
Organon, in exchange for certain marketing rights, will support research and
development, including the full cost of all clinical testing, pay a one-time
license fee, make milestone payments and pay royalties on product sales, if any.
See "Risk Factors -- Dependence Upon Collaborative Partners" and
"Business -- Collaborative Arrangements."
 
     Insulin Dependent Diabetes Mellitus.  IDDM, or Type I diabetes, is caused
by an autoimmune attack resulting in the destruction of the insulin-producing SS
cells in the pancreas. Insulin regulates the cellular
 
                                       26
<PAGE>   29
 
uptake and metabolism of glucose, and its deficiency leads to hyperglycemia,
diabetic acidosis, and diabetic coma. Long term complications include vision
loss, renal failure and peripheral neuropathy. Currently, individuals with IDDM
are given insulin to supplement their ability to produce sufficient amounts of
the hormone. IDDM usually appears in individuals before the age of 20 and
affects about 0.5% of the Caucasian population worldwide. Based on published
data and other sources, the Company believes that there are approximately
1,800,000 cases of IDDM worldwide.
 
     The Company has performed preclinical studies using an IDDM/AnergiX
compound composed of an MHC II molecule coupled with a synthetic glutamic acid
decarboxylase ("GAD") peptide in NOD mice, an animal model of IDDM. The GAD
peptide is suspected to be the self-antigen, which leads to the autoimmune
attack in diabetes. The Company tested this compound by treating NOD mice in a
dosing regimen designed to inactivate or anergize disease-causing T cells,
thereby preventing diabetes. Results of the study showed that treatment with the
IDDM/AnergiX complex reduced the rate of destruction of insulin-producing SS
cells in a dose dependent manner, while treatment with the GAD peptide alone
accelerated the disease. Under the Company's collaborative agreement with Novo
Nordisk, Novo Nordisk will support research and development of the Company's
program and will pay royalties on worldwide sales of any resulting products. See
"Risk Factors -- Dependence Upon Collaborative Partners" and
"Business -- Collaborative Arrangements -- N.V. Organon.
 
     Myasthenia Gravis.  MG is a neuromuscular disorder that is characterized by
muscle weakness and may lead to death in severe cases. Current methods of
treatment for MG utilize drugs that only ameliorate the symptoms and generally
are not effective in most cases of moderate or progressive MG. The more powerful
of these drugs have significant unwanted side effects. Based on published data
and other sources, the Company believes that there are approximately 50,000
cases of MG worldwide.
 
     The Company has established an in vivo experimental model of autoimmune
myasthenia gravis ("EAMG") in rats, which is considered pathologically and
clinically comparable to human MG. Initial results indicate that the Company's
MG/AnergiX reduces clinical symptoms of this disease in rats. Additionally, the
Company tested its therapeutic approach for MG on human cells. Through this
study, the Company has identified what it believes to be an appropriate
antigenic peptide involved in MG. Using MG/AnergiX, the Company has demonstrated
in vitro inactivation of T cells associated with MG. This study also indicated
that the patients' T cells respond to the same antigen over time and that
potentially effective doses appear to be low. Under the Company's collaborative
agreement with Novo Nordisk, Novo Nordisk will support research and development
of the Company's MG program and will pay royalties on worldwide sales of any
resulting products. The Company has retained co-promotion rights in North
America for therapeutics in MG. See "Risk Factors -- Dependence Upon
Collaborative Partners" and "Business -- Collaborative Arrangements -- Novo
Nordisk A/S."
 
ADDITIONAL APPLICATIONS FOR ANERGEN TECHNOLOGIES
 
     The Company believes that its core technologies could be applied to a
number of other autoimmune diseases. To create an effective AnergiX product
intended to inactivate the T cells associated with a specific autoimmune
disease, one must correctly combine a proper epitope specific for the target
autoimmune disease with a proper MHC molecule associated with that disease.
Recent advances in the understanding of events that trigger autoimmune diseases
have accelerated the search for the epitopes associated with particular
diseases. Anergen intends to license technology developed by others and to
collaborate in the research and development of epitopes that, when combined with
the Company's MHC molecules in a proprietary soluble form, would result in
AnergiX compounds for the treatment of other autoimmune diseases. In 1994, the
Company initiated a research collaboration with a physician at the University of
Medicine and Dentistry of New Jersey to identify the epitope associated with
inflamatory bowel disease.
 
     In order to develop additional AnervaX peptide vaccine products, the
Company must first identify the particular MHC sub-type involved with initiation
and continuation of the particular autoimmune disease. The Company must then
identify that portion of the MHC molecule sub-type that triggers an immune
response. It is this response that interferes with the presentation of the self
antigen to disease-related T cells. Based upon recent advances in the
understanding of the genetic clustering of MHC sub-types and their involvement
in
 
                                       27
<PAGE>   30
 
other autoimmune diseases, the Company believes additional product candidates
may be developed utilizing its AnervaX core technology.
 
     While development and commercialization of the Company's approach to
altering autoimmune disease states remains Anergen's focus, the Company is also
monitoring other opportunities that may arise out of its technology and
expertise, including the development of diagnostics for autoimmune and related
diseases and the possibility of adapting its T cell-specific drug delivery
approach to delivering compounds that would kill particular T cells, a method
that may prove useful in severe cases where an autoimmune disease has
substantially progressed. The Company expects to pursue funding from
collaborative partners prior to extensive research in any of these areas.
 
COLLABORATIVE ARRANGEMENTS
 
     Novo Nordisk A/S.  In August 1993, the Company entered into a collaborative
agreement with Novo Nordisk with an initial three-year development program term
and Novo Nordisk made an equity investment in the Company. Under the
collaborative agreement, Novo Nordisk will make milestone payments and support
research and development of the Company's MS, MG and IDDM programs in exchange
for exclusive worldwide rights to products developed under the collaboration,
including rights to commercialize these products, subject to the payment of
royalties to the Company. The Company has retained rights of co-promotion in
North America for therapeutics in MS and MG. In the event the Company engages in
co-promotion of its MS and MG products in North America, Novo Nordisk has agreed
to modify the royalty payments made to the Company to compensate for the level
of its marketing and sales efforts in amounts to be negotiated. In March 1996,
the Company and Novo Nordisk extended the term of the development program by an
additional two-year period through August 1998. Novo Nordisk may terminate the
agreement with respect to its development rights upon six months prior written
notice. The development program is subject to ongoing review by a research
committee that includes equal representation of both partners. The development
expenses incurred by the Company and reimbursable by Novo Nordisk are
significant and expected to increase. Under the original agreement, the research
and development support and milestone payments which may be received by the
Company under this agreement are estimated to total $25 million, including an $8
million equity investment made in the Company in August of 1993 for 1,219,745
shares of the Company's Common Stock. The Company recorded $3.0 million in
contract revenues related to this agreement in 1995 as compared to $2.3 million
in 1994. The expansion of this agreement and extension of the term of the
development program in March 1996 increased the estimated total proceeds to the
Company by an additional $10 million to $35 million.
 
     N.V. Organon  In June 1996, the Company entered into a collaborative
agreement with Organon under which Organon will pay the Company a license fee,
make milestone payments, and support research and development of an AnergiX
compound intended for the treatment of RA in exchange for certain marketing
rights, including certain rights to the commercialization of these products,
subject to the payment of royalties to the Company. The compound to be developed
uses Anergen's proprietary technology and incorporates a proprietary peptide
discovered by Organon coupled with an MHC molecule. This arrangement has no
effect on the Company's ownership of its AnervaX therapeutic intended to treat
RA, which is currently in Phase II clinical testing. The Company's development
program under the Organon agreement has an initial three-year term. Under the
agreement, Anergen granted to Organon exclusive worldwide rights to any products
developed under the collaborative agreement, including rights to commercialize
the products. While the agreement initially grants Organon rights to any AnergiX
compounds within the field of RA, after an initial Phase I study, Anergen has
the right, at its sole discretion, to convert Organon's rights to a
non-exclusive basis, in which case milestone payments and royalty rates would be
modified.
 
     The agreement with respect to marketing rights continues in full force for
as long as Organon is engaged in marketing such products. Organon may terminate
the development program after thirty months by giving the Company six months
prior written notice. The Company has retained certain limited rights of co-
promotion in North America for therapeutics developed under the arrangement. In
the event the Company engages in co-promotion of products in North America,
Organon has agreed to modify the royalty payments made to the Company to
compensate for the level of its marketing and sales efforts in amounts to be
 
                                       28
<PAGE>   31
 
negotiated. The development program is subject to ongoing review by a research
committee which includes equal representation of both partners. The development
expenses incurred by the Company and reimbursable by Organon are expected to be
significant and to increase.
 
     Other Arrangements.  The Company has several collaborations with academic
and clinical researchers to perform certain research, development and clinical
trial activities. To the extent that the Company is unable to maintain or
establish such collaborative arrangements, the Company's research, development
and clinical activities and business would be adversely affected.
 
     The Company's strategy for the development, clinical trials, manufacturing
and commercialization of its products includes maintaining existing and
establishing additional collaborations with corporate partners, licensors,
licensees and others. There can be no assurance that the Company will be able to
maintain existing collaborative arrangements or establish new collaborative
arrangements in the future. To the extent that the Company is unable to maintain
or establish such collaborative arrangements, the Company's research and
development efforts and business would be adversely affected. In addition, the
Company's collaborative partners may develop, either alone or with others,
products that compete with the development and marketing of the Company's
products. The development of such competing products may result in the
withdrawal of support with respect to all or a portion of the Company's
technology which would have a material adverse effect on the Company's business,
financial conditions and results of operations. See "Risk Factors -- Dependence
Upon Collaborative Partners" and "Management's Discussion and Analysis of
Financial Condition and Results of Operations -- Liquidity and Capital
Resources."
 
MANUFACTURING
 
     Manufacture of the Company's AnergiX compounds requires the production of
two basic parts: the disease specific epitope and the MHC molecule. The Company
then combines these two component parts and puts them in a soluble form suitable
for a therapeutic product. The Company is currently synthesizing several
different epitopes related to MS, IDDM and MG for use in its research and
development operations. To date, the Company has contracted with an outside
manufacturer to produce the selected MS specific peptide under GMP guidelines.
In the future the Company may consider scaling up its synthesis operations in
order to produce these epitopes internally.
 
     Production of MHC molecules can be accomplished in one of two ways: MHC
molecules can be extracted from cells cloned from commercially available cell
lines or MHC molecules can be produced using recombinant DNA technology. During
1993, the Company began producing MHC molecules in its pilot clinical
manufacturing facility. The initial production utilizes a mammalian cell culture
system to grow cells from a human cell line from which MHC molecules are
extracted. In 1995, the Company was inspected and granted a site license to
manufacture products for human use by the California Food and Drug
Administration. The Company, together with Novo Nordisk, is currently in the
process of evaluating production of MHC molecules using recombinant DNA
technology. The Company believes that either production methodology will provide
sufficient quantities of MHC for the Company's anticipated clinical trials.
 
     The Company has contracted with an outside manufacturer to fill, finish and
package its final compounds. The Company's strategy is to maintain control over
its AnergiX manufacturing technology which will facilitate seeking of patent
protection and enable timely supply of products for clinical trials. Whether the
Company will choose to develop a full-scale manufacturing facility, rely on its
corporate partner, or rely on outside contract manufacturing will be determined
in the future after consideration of the Company's financial and scientific
resources and the potential advantages and disadvantages of these alternatives.
Anergen and Novo Nordisk have agreed to share manufacturing of AnergiX, but it
is at the discretion of Novo Nordisk to determine the degree to which the
Company will share in the manufacture of AnergiX. See "Risk Factors -- Need to
Develop Manufacturing Capabilities; Reliance on Sole Supplier."
 
     Manufacture of the Company's AnervaX compounds is performed by an outside
contract manufacturer and the resultant product is filled and finished by a
second subcontractor. There can be no assurance that such parties will be able
to meet the Company's needs either with respect to timing, quantity or quality.
If the
 
                                       29
<PAGE>   32
 
Company is unable to obtain or retain third party manufacturing on acceptable
terms, it may be delayed in its ability to commercialize AnervaX. The Company's
dependence upon third parties for the manufacturing of AnervaX may adversely
affect the Company's profit margins and its ability to develop, deliver and sell
products on a timely and competitive basis, if at all.
 
MARKETING AND SALES
 
     The Company currently has no sales, marketing or distribution capability.
The Company has entered into collaborative relationships with Novo Nordisk and
Organon for the commercialization of its MS, RA, IDDM and MG products. For other
potential products, the Company intends to rely on relationships with one or
more pharmaceutical companies with established distribution systems and direct
sales forces to market its products. In the event that the Company is unable to
reach agreement with one or more pharmaceutical companies to market its
products, it may be required to market its products directly and to develop a
marketing and sales force with technical expertise and with supporting
distribution capability. There can be no assurance that the Company will be able
to establish in-house sales and distribution capabilities or relationships with
third parties, or that it will be successful in gaining market acceptance for
its products. To the extent that the Company enters into co-promotion or other
licensing arrangements, any revenues received by the Company will depend upon
the efforts of third parties, and there can be no assurance that such efforts
will be successful.
 
PATENTS AND PROPRIETARY RIGHTS
 
     The Company is pursuing patent protection for its proprietary technologies.
In July 1992, the Company was issued a U.S. patent that covers pharmaceutical
compositions comprising MHC-peptide complexes. Four subsequent U.S. patents have
provided additional protection for these complexes, methods of making them, and
their use to induce anergy in T cells. The last patent in this series was issued
in November 1995 and all five U.S. patents in such series expire in 2009. The
Company has also been issued one other U.S. patent based upon other aspects of
its research, expiring in 2011. In June 1996, the Company received a grant for a
European patent directed to the MHC-peptide complexes, expiring in 2008. A
related patent has also been issued in Korea, expiring in 2008. In addition,
Anergen has filed other patent applications in Canada, the EPO and Japan.
Pending patent applications in the U.S. and other countries include those
covering different aspects of the Company's AnergiX and AnervaX technologies.
 
     The Company has also entered into a number of collaborative research
arrangements with consultants at academic institutions. These agreements
generally provide for exchanges of information and for nondisclosure of
technical information by both parties, but the Company's current agreements do
not obligate the Company to release any of its technology for use by any other
entities nor commit the Company to pay royalties on any discovery made in
connection with such research agreements. In the future, the Company may enter
into agreements which provide for royalties in exchange for technology rights.
 
     The Company's success will depend in significant part on its ability to
maintain patent protection for its therapeutic approach and for any developed
products, to preserve its trade secrets and to operate without infringing the
proprietary rights of third parties. Although the Company has obtained patents
covering certain aspects of its technology, no assurances can be given that
additional patents will be issued or, if issued, that the scope of any patent
protection will be significant, or that the patents will be held valid if
subsequently challenged. Moreover, the Company cannot ascertain with certainty
that no patent conflict will exist with other products or processes which could
compete with the Company's approaches.
 
     Because of the length of time and expense associated with bringing new
products through development and to the marketplace, and the length of time
required for the governmental approval process, the pharmaceutical industry has
traditionally placed considerable importance on obtaining and maintaining patent
and trade secret protection for significant new technologies, products and
processes. The Company and other
 
                                       30
<PAGE>   33
 
biotechnology and pharmaceutical firms have applied, and are applying, for
patents for their products and certain aspects of their technologies. The
enforceability of patents issued to biotechnology and pharmaceutical firms is
highly uncertain. Federal court decisions indicating legal considerations
surrounding the validity of patents in the field are in transition, and there
can be no assurance that the historical legal standards surrounding questions of
validity will continue to be applied or that current defenses as to issued
patents in the field will offer protection in the future. In addition, there can
be no assurance as to the degree and range of protection any patents will
afford, whether patents will issue or the extent to which the Company will be
successful in not infringing patents granted to others.
 
     While the Company pursues patent protection for products and processes
where appropriate, it also relies on trade secrets, know-how and continuing
technological advancement to develop and maintain its competitive position. The
Company's policy is to have each employee enter into an agreement that contains
provisions prohibiting the disclosure of confidential information to anyone
outside the Company. Research and development contracts and relationships
between the Company and its scientific consultants provide access to aspects of
the Company's know-how that is protected generally under confidentiality
agreements with the parties involved. There can be no assurance, however, that
these confidentiality agreements will be honored or that the Company can
effectively protect its rights to its unpatented trade secrets. Moreover, there
can be no assurance that others will not independently develop substantially
equivalent proprietary information and techniques or otherwise gain access to
the Company's trade secrets.
 
     The Company may be required to obtain licenses to patents or other
proprietary rights from third parties. The Company has not performed regular
patent watches for patents potentially covering each of its proposed products.
There can be no assurance that any licenses required under any patents or
proprietary rights will be made available on terms acceptable to the Company, if
at all. If the Company does not obtain required licenses, it could encounter
delays in product development while it attempts to redesign products or methods
or it could find that the development, manufacture or sale of products requiring
such licenses could be foreclosed.
 
     The Company is aware of a European patent and corresponding U.S. and
Australian patents which contain claims that relate to certain of the Company's
proposed products and their uses. In accordance with EPO procedures, third
parties can oppose an EPO patent grant by presenting information which they
believe justifies narrowing or revoking the grant of the patent. The Company is
opposing the aforementioned grant in the EPO. There can, however, be no
assurance that the granted EPO claims will be revoked or significantly narrowed
in scope as a result of the opposition proceeding. If valid claims in these
patents are found to be infringed by the Company's products, the Company's
ability to make, use, offer to sell, or sell, such products could be materially
and adversely affected.
 
     In addition, the Company could incur substantial costs in defending any
patent litigation brought against it or in asserting the Company's patent
rights, including those licensed to the Company by others, in a suit against
another party. The USPTO could institute interference proceedings in connection
with one or more of the Company's patents or patent applications, which
proceedings could result in an adverse decision as to priority of an invention.
The USPTO also could institute reexamination proceedings in connection with one
or more of the Company's patents or patent applications, which could result in
an adverse decision as to the patents' validity or scope. See
"Business -- Patents and Proprietary Rights."
 
     The terms Anergen, AnergiX, MS/AnergiX, MG/AnergiX, RA/AnergiX,
IDDM/AnergiX and AnervaX are trademarks of the Company. The Company's
registration of the trademarks Anergen, AnergiX and AnervaX are currently
pending, and the Company intends to register the remaining trademarks.
 
COMPETITION
 
     The biotechnology and pharmaceutical industries are characterized by
rapidly evolving technology and intense competition. The Company's competitors
include major pharmaceutical, chemical and specialized biotechnology companies,
most of which have financial, technical, research and development,
manufacturing, clinical and marketing resources significantly greater than those
of the Company. The Company believes that these other entities recognize the
need for effective therapies for the autoimmune diseases targeted by the Company
and are highly motivated to develop such therapies. In addition, many
specialized biotechnology
 
                                       31
<PAGE>   34
 
companies have formed collaborations with large, established companies to
support research, development and commercialization of products that may be
competitive with those of the Company. Academic institutions, governmental
agencies and other public and private research organizations are also conducting
research activities and seeking patent protection and may commercialize products
on their own or through joint ventures. The Company is aware of certain products
in development by competitors that are intended to be used for the prevention or
treatment of certain diseases the Company has targeted for product development.
The existence of these products, or other products or treatments of which the
Company is not aware, or products or treatments that may be developed in the
future which may be more effective, may adversely affect the commercialization
or marketability of products which may be developed by the Company or
potentially render the Company's technology obsolete or non-competitive.
 
     The Company's competitive position will depend on its ability to attract
and retain qualified scientific and other personnel, develop effective
proprietary products, implement production and marketing plans, obtain patent
protection and secure adequate capital resources. In addition, the first
pharmaceutical product to reach the market in a therapeutic or preventive area
is often at a significant competitive advantage relative to later entrants to
the market. The Company expects its products, if approved for sale, to compete
primarily on the basis of product efficacy, safety, patent position,
reliability, price and patient convenience.
 
     There are numerous pharmaceutical and biotechnology companies developing
therapies against autoimmune diseases. Many pharmaceutical companies are working
on products to treat MS. Current therapies, which have limited impact on the
disease state and primarily affect symptoms, include two beta interferon drugs.
Other potential therapeutics which target the underlying disease state include
oral tolerance therapy and peptide-based therapies. In RA, there are also many
upgrades under development which target the underlying disease state including
oral tolerance, peptide based therapies, peptide vaccines to the T cell
receptors and humanized antibodies. In IDDM, one experimental approach is based
on non-specific inhibition of T cells using cyclosporin, a general
immunosuppressant. In patients who already have IDDM, transplantation of
pancreas or insulin-producing beta cells is also being explored. Autoimmune
diseases are a major target for many companies developing therapeutics, and it
is unclear which approaches will work most effectively.
 
     The Company believes that the ability of its AnergiX to inactivate only the
specific T cells related to a particular autoimmune disease may provide, if the
Company's products are successfully developed, an important competitive
advantage over companies using approaches which have broader suppressive effects
on the human immune system. Anergen also believes that its ability to inactivate
these specific T cells without the use of toxins, if successfully demonstrated,
would be advantageous. The Company also believes that its AnervaX approach, if
successfully developed, may offer a competitive advantage if it is found to
interrupt disease progression without severely suppressing the immune system.
 
GOVERNMENT REGULATION
 
     The Company's research and development activities are subject to regulation
by numerous governmental authorities in the United States and other countries,
and the production and marketing of any products developed by the Company would
also be regulated, particularly as to safety and efficacy. In the United States,
vaccines, drugs and biologics are subject to rigorous FDA review. The Federal
Food, Drug, and Cosmetic Act, the Public Health Service Act and other federal
statutes and regulations govern or influence the testing, manufacture, safety,
labeling, storage, record keeping, approval, advertising and promotion of such
products. Noncompliance with applicable requirements can result in fines, recall
or seizure of products, clinical study holds, total or partial suspension of
production, refusal of the government to approve product license applications or
allow the Company to enter into supply contracts and criminal prosecution. The
FDA also has the authority to revoke PLAs, and ELAs previously granted.
 
     In order to obtain FDA approval of a new biological product, the Company
must submit proof of safety, purity, potency and efficacy. In most cases such
proof entails extensive pre-clinical, laboratory and clinical tests. The
testing, preparation of necessary applications and processing of those
applications by the FDA is expensive and time consuming, can vary based on the
type of product, and may take several years to complete. There is no assurance
that the FDA will act favorably or quickly in making such reviews, and
significant
 
                                       32
<PAGE>   35
 
difficulties or costs may be encountered by the Company in its efforts to obtain
FDA approvals that could delay or preclude the Company from marketing any
products it may develop or furnish an advantage to competitors. The FDA may also
require post-marketing testing and surveillance to monitor the effects of
approved products or place conditions on any approvals that could restrict the
commercial applications of such products. Product approvals may be withdrawn if
compliance with regulatory standards is not maintained or if problems occur
following initial marketing. In addition, delays imposed by the governmental
approval process may materially reduce the period during which the Company may
have the exclusive right to exploit patented products or technologies.
 
     The FDA approval process for a new biological drug involves completion of
pre-clinical studies which include laboratory tests and animal studies to assess
safety and effectiveness of the drug. Among other things, the results of these
studies as well as how the product will be manufactured are submitted to the FDA
as part of an IND and, unless the FDA objects, the IND becomes effective 30 days
following receipt by the FDA. FDA cleared human clinical trials may then be
conducted. There can be no assurance that submission of an IND will result in
FDA authorization to commence clinical trials. The results of the clinical
trials are submitted to the FDA as part of a PLA. In addition to obtaining FDA
approval for each AnergiX indication, an ELA must be filed and the FDA must
approve the manufacturing facilities for the product. Product sales may only
commence if the PLA and ELA are approved. Regulatory requirements for obtaining
such FDA approvals are rigorous and there can be no assurance that such
approvals will be obtained on a timely basis or at all.
 
     Human clinical trials are typically conducted in three sequential phases,
but the phases may overlap. Phase I trials consist of testing the product in a
small number of patients primarily for safety at one or more dosage levels. In
Phase II, in addition to safety, the efficacy of the product is evaluated in a
patient population slightly larger than Phase I trials, and appropriate dosage
is established. Phase III trials typically involve additional testing for safety
and clinical efficacy in an expanded patient population at geographically
dispersed test sites, and with the dosage that will be submitted for approval. A
clinical plan, or "protocol", accompanied by the approval of the institutional
review board at the institution participating in the trials, and patient-
informed consent form must be submitted to the FDA prior to commencement of each
clinical trial. The FDA may order the temporary or permanent discontinuation of
a clinical trial at any time if it believes patient safety is at risk. The
Company's regulatory strategy is to seek input from the FDA at all stages of
clinical testing and manufacturing process development.
 
     The results of the pre-clinical and clinical studies on biological drugs
such as the Company's AnergiX are submitted to the FDA in the form of a PLA and
ELA for approval to commence commercial sales. After completion of the FDA's
preliminary review of the PLA submission, the submission is sent to an FDA
selected scientific advisory panel composed of physicians and scientists with
expertise in the particular field. The FDA scientific advisory panel issues a
recommendation to the FDA that includes conditions for approval of the PLA.
Although the recommendation is not binding, the agency generally follows an
advisory panel's advice. Toward the end of the PLA review process, the FDA will
conduct an inspection of the manufacturer's facilities to ensure that they are
in compliance with the applicable GMP requirements. If the FDA evaluation of
both the ELA application and manufacturing facilities contained in the PLA
application are favorable, the FDA will issue an approval letter, which usually
contains a number of conditions which must be met in order to secure final
approval. In responding to the PLA, the FDA may grant marketing approval,
require additional testing or information, or deny the application. Governmental
approval of products developed by the Company may entail limitations on the
indicated uses for which such products may be marketed. Continued compliance
with all FDA requirements and the conditions in an approved application,
including product specification, manufacturing process, labeling and promotional
material and record keeping and reporting requirements, is necessary for all
products. Failure to comply, or the occurrence of unanticipated adverse effects
during commercial marketing, could lead to the need for product recall or other
FDA-initiated action, which could delay further marketing until the products are
brought into compliance.
 
     Under the Orphan Drug Act, the FDA may designate a product as an orphan
drug. An orphan drug is a drug intended to treat a "rare disease or condition,"
which is a disease or condition that affects populations of fewer than 200,000
individuals in the United States or, if victims of a disease number more than
200,000, the
 
                                       33
<PAGE>   36
 
sponsor establishes that it does not realistically anticipate that its product
sales will be sufficient to recover its costs. If a product is designated as an
orphan drug, then the sponsor is entitled to receive certain incentives to
undertake the development and marketing of the product, including limited tax
credits and high priority FDA review of an NDA. In addition, the sponsor that
obtains the first marketing approval for a designated orphan drug for a given
rare disease is eligible to receive marketing exclusivity for a period of seven
years. There may be multiple designations of an orphan drug; however, only the
sponsor of the first approved NDA for a given drug for its use in treating a
given rare disease may receive marketing exclusivity. The Company may apply for
orphan drug designation for some of its products and indications in development.
There is no assurance that the FDA would grant orphan drug designation or
marketing exclusivity for any such indications or products.
 
     The Company is also subject to regulation by the OSHA and the EPA and to
regulation under the Toxic Substances Control Act, the Resource Conservation and
Recovery Act and other regulatory statutes, and may in the future be subject to
other federal, state or local regulations. Although the Company believes that
its safety procedures for handling and disposing of hazardous materials comply
with the standards prescribed by current laws and regulations, the risk of
accidental contamination or injury from these materials cannot be completely
eliminated. In the event of such an accident, the Company could be held liable
for any damages that result and any such liability could exceed the resources of
the Company. In addition, regulations may be promulgated governing biotechnology
that may affect the Company's research and development programs. The Company is
unable to predict whether any agency will adopt any regulation which would have
a material adverse effect on the Company's operations.
 
     Sales of pharmaceutical products outside the United States are subject to
foreign regulatory requirements that vary widely from country to country. The
time required to obtain approvals required by foreign countries may be longer or
shorter than that required for FDA approval, and requirements for licensing may
differ from FDA requirements.
 
     Satisfaction of these FDA requirements, or similar requirements by foreign
regulatory agencies, typically takes several years and the time needed to
satisfy them may vary substantially, based upon the type, complexity and novelty
of the pharmaceutical product. The effect of government regulation may be to
delay or to prevent marketing of potential products for a considerable period of
time and to impose costly procedures upon the Company's activities. There can be
no assurance that the FDA or any other regulatory agency will grant approval for
any products being developed by the Company on a timely basis, or at all.
Success in preclinical or early stage clinical trials does not assure success in
later stage clinical trials. Data obtained from preclinical and clinical
activities are susceptible to varying interpretations which could delay, limit
or prevent regulatory approval. If regulatory approval of a product is granted,
such approval may impose limitations on the indicated uses for which a product
may be marketed. Further, even if regulatory approval is obtained, later
discovery of previously unknown problems with a product may result in
restrictions on the product, including withdrawal of the product from the
market. Delay in obtaining or failure to obtain regulatory approvals would have
a material adverse effect on the Company's business financial condition or
results of operations.
 
PHARMACEUTICAL PRICING AND REIMBURSEMENT
 
     Political, economic and regulatory influences are subjecting the health
care industry in the United States to fundamental change. Initiatives to reduce
the federal deficit and to reform health care delivery are increasing these cost
containment efforts. The Company anticipates that Congress, state legislatures
and the private sector will continue to review and assess alternative benefits,
controls on health care spending through limitations on the growth of private
health insurance premiums and Medicare and Medicaid spending, the creation of
large insurance purchasing groups, price controls on pharmaceuticals and other
fundamental changes to the health care delivery system. Any such proposed or
actual changes could cause any potential partners of the Company to limit or
eliminate spending on collaborative development projects. Legislative debate is
expected to continue in the future, market forces are expected to demand reduced
costs and Anergen cannot predict what impact the adoption of any federal or
state health care reform measures or future private sector reforms may have on
its business.
 
                                       34
<PAGE>   37
 
     In both domestic and foreign markets, sales of the Company's proposed
products will depend in part upon the availability of reimbursement from
third-party payors, such as government health administration authorities,
private health insurers and other organizations. In addition, other third-party
payors are increasingly challenging the price and cost effectiveness of medical
products and services. Significant uncertainty exists as to the reimbursement
status of newly approved health care products. There can be no assurance that
the Company's potential products or products discovered in collaboration with
the Company will be considered cost-effective or that adequate third-party
reimbursement will be available to enable Anergen to maintain price levels
sufficient to realize an appropriate return on its investment in product
research, discovery and development. Legislation and regulations affecting the
pricing of pharmaceuticals may change before the Company's proposed products are
approved for marketing. Adoption of such legislation could further limit
reimbursement for medical products. If adequate coverage and reimbursement
levels are not provided by the government and third-party payors for the
Company's products, the market acceptance of these products would be adversely
affected, which would have a material adverse effect on the Company's business,
financial condition and results of operations.
 
PRODUCT LIABILITY INSURANCE
 
     The testing, marketing and sale of human health care products entail an
inherent risk of exposure to product liability claims in the event that the use
of the Company's technology or prospective products is alleged to have resulted
in adverse effects. While the Company has taken, and will continue to take, what
it believes are appropriate precautions to minimize exposure to product
liability, there can be no assurance that it will avoid significant liability.
The Company possesses limited general liability and product liability insurance
related to its clinical trials of AnervaX for RA and intends to seek such
insurance related to its clinical trials of AnergiX for MS, and certain other
types of insurance customarily obtained by business organizations. There can be
no assurance that the existing insurance coverage is adequate or that it will
avoid liability. The Company intends to seek insurance against product liability
risks associated with the testing, manufacturing or marketing of its products.
However, there can be no assurance that it will be able to obtain such insurance
in the future, or that if obtained, such insurance will be sufficient in amount.
Consequently, a product liability claim or other claims with respect to
uninsured liabilities or in excess of insured liabilities could have a material
adverse effect on the business or financial condition of the Company.
 
EMPLOYEES
 
     As of May 31, 1996, the Company had 60 full-time employees, of whom
fourteen hold doctoral or medical degrees. Of the 60 full-time employees, 51
were engaged in, or directly supporting, the Company's research and development
activities. The Company also employs several part-time workers. The Company
considers relations with its employees to be good. None of the Company's
employees is covered by a collective bargaining agreement.
 
FACILITIES
 
     The Company's laboratory and administrative facilities occupy approximately
27,000 square feet of space in Redwood City, California. The majority of these
facilities are subject to a lease which expires on January 3, 1999, with a
two-year renewal option. The Company believes that this space is adequate for
its immediate needs, and that it will be able to obtain additional space as
necessary.
 
SCIENTIFIC ADVISORY BOARD
 
     Anergen benefits from the advice and assistance of its Scientific Advisory
Board, most of whom are involved in ongoing discussions with the Company's
researchers and all of whom are involved in full-time teaching and research at
academic institutions. The names of the members of the scientific advisory board
and some background information about them are set forth below.
 
     Mark Davis, Ph.D., Professor, Department of Microbiology and Immunology,
Stanford University School of Medicine. Dr. Davis has been involved in research
on the structure and function of the T cell receptor. His
 
                                       35
<PAGE>   38
 
group isolated and characterized a T cell receptor gene and recently succeeded
in expressing both T cell antigen receptor and MHC II molecules in a soluble
form to facilitate analysis of their properties.
 
     Patricia Jones, Ph.D., Professor, Department of Biological Sciences,
Stanford University. Dr. Jones has been involved in research on the biochemistry
and molecular biology of MHC II molecules.
 
     Harden McConnell, Ph.D., Robert Eckels Swain Professor and Chairman of the
Department of Chemistry, Stanford University. Dr. McConnell has been involved in
research on the properties, structure and functioning of cell membrane
components including MHC II proteins. He is also a director of the Company.
 
     Subramaniam Sriram, M.D., Professor of Neurology, Vanderbilt University
Medical Center. Dr. Sriram's research efforts are directed towards elucidating
immunological mechanisms of autoimmune diseases of the central nervous system.
He has been involved in advancing the concept that MHC II molecules and helper T
cells are necessary parts of the pathology of autoimmune diseases.
 
     The Company believes it has a good working relationship with its Scientific
Advisory Board. Communication with many members of the Scientific Advisory Board
takes place on a regular basis and in some cases at least weekly. In accordance
with consulting agreements the Company has with these advisors, information
conveyed to the Company as part of the consulting activity is the property of
the Company. Should scientific discoveries be made by a member of the Scientific
Advisory Board in conjunction with other research at another institution rather
than while acting as a consultant to the Company, that discovery would generally
be owned by the researcher or that institution. If such a discovery were deemed
to be helpful in the Company's own research, the Company would have to enter
into a license agreement in order to utilize the discovery. The Company relies
on its scientific advisors to assist the Company in formulating its research and
development strategy. Retaining and attracting qualified advisors will be
critical to the Company's success. Each of the scientific advisory Board members
is paid $12,000 annually for his or her services.
 
LEGAL PROCEEDINGS
 
     The Company is not a party to any material legal proceedings.
 
                                       36
<PAGE>   39
 
                                   MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
     The following table sets forth certain information regarding the directors
and executive officers of the Company:
 
<TABLE>
<CAPTION>
                     NAME                       AGE              POSITION WITH THE COMPANY
- ----------------------------------------------  ---     --------------------------------------------
<S>                                             <C>     <C>
Barry M. Sherman, M.D. .......................  55      President, Chief Executive Officer and
                                                          Director
John W. Varian................................  37      Vice President, Finance and Chief Financial
                                                          Officer
Jeffrey L. Winkelhake, Ph.D. .................  51      Vice President, Pharmaceutical Development
Bruce L.A. Carter, Ph.D. .....................  52      Director
Nicholas J. Lowcock...........................  32      Director
Harden M. McConnell, Ph.D. ...................  67      Director
Harry H. Penner, Jr. .........................  50      Director
James E. Thomas...............................  36      Director
Nicole Vitullo................................  39      Director
</TABLE>
 
     BARRY M. SHERMAN, M.D., joined the Company as President and Chief Executive
Officer and as a director in May 1996. Dr. Sherman previously served as Senior
Vice President and Chief Medical Officer at Genentech, Inc. ("Genentech"), a
biotechnology company. Dr. Sherman joined Genentech in 1985, and while there
served as a member of the Operations Committee and was responsible for the
company's overall clinical development activities. Since 1986, Dr. Sherman has
also been a Clinical Professor of Internal Medicine at Stanford University. From
1971 to 1985, Dr. Sherman was a Professor of Internal Medicine, Director of the
Clinical Research Center and Associate Chairman of the Department of Internal
Medicine at the University of Iowa College of Medicine. Dr. Sherman received his
M.D. in 1966 from the University of Michigan.
 
     JOHN W. VARIAN joined the Company as Vice President, Finance and Chief
Financial Officer in August 1991. Prior to joining the Company, and since 1987,
Mr. Varian was a Senior Manager with Ernst & Young LLP. Mr. Varian is a
certified public accountant and received his BBA from Western Michigan
University.
 
     JEFFREY L. WINKELHAKE, PH.D., joined the Company in April 1993 as Vice
President, Pharmaceutical Development. Prior to joining the Company, Dr.
Winkelhake served for three years as Director of Program Management at Cytel
Corporation, a biotechnology company. Prior to that, he served for over six
years as Director of Pharmacology at Cetus Corporation, also a biotechnology
company. From 1976 to 1984, Dr. Winkelhake was a Professor of Microbiology at
the Medical College of Wisconsin. Dr. Winkelhake received his Ph.D. in
Immunochemistry/Pharmacology from the University of Illinois.
 
     BRUCE L. A. CARTER, PH.D., has served as a director of the Company since
February 1994. Since 1994 Dr. Carter has served as Corporate Executive Vice
President and Chief Scientific Officer of Novo Nordisk, a pharmaceutical and
bio-industrial company. From 1988 to 1995, Dr. Carter served as president of
ZymoGenetics, Inc., a biotechnology company that is a subsidiary of Novo
Nordisk, and has served as its chairman since 1994.
 
     NICHOLAS J. LOWCOCK has served as a director of the Company since April
1995. Since August 1994, Mr. Lowcock has been an associate with E.M. Warburg,
Pincus & Co., Inc., a venture financing firm. Prior to August 1994, Mr. Lowcock
was a consultant with The Boston Consulting Group.
 
     HARDEN M. MCCONNELL, PH.D., has served as a director of the Company since
May 1989. Dr. McConnell has been a Professor of Chemistry at Stanford University
since 1964 and became Chairman of the Department of Chemistry in 1989. He is
also a member of the Company's Scientific Advisory Board.
 
                                       37
<PAGE>   40
 
     HARRY H. PENNER, JR. has served as a director of the Company since August
1993. Since December 1993, Mr. Penner has been President and Chief Executive
Officer of Neurogen Corporation, a neuropharmaceutical company. From 1985 to
December 1993, Mr. Penner was Executive Vice President of Novo Nordisk and,
beginning in 1988, President of Novo Nordisk of North America, a subsidiary of
Novo Nordisk.
 
     JAMES E. THOMAS has served as a director of the Company since April 1995.
Since 1989, Mr. Thomas has been employed by E.M. Warburg, Pincus & Co., Inc., a
venture financing firm, where he currently serves as Managing Director. Prior to
1989, Mr. Thomas was a Vice President of Goldman Sachs International in London.
Mr. Thomas is also a director of Celtrix Pharmaceuticals, Inc., Menley & James
Laboratories, Inc. and a number of privately held companies.
 
     NICOLE VITULLO has served as a director of the Company since April 1995.
Ms. Vitullo is an Investment Advisor for Rothschild Asset Management, Ltd., a
manager of two publicly traded biotechnology funds, Biotechnology Investments
Limited and IBT. Prior to joining Rothschild in 1992, Ms. Vitullo was a Director
of Corporate Communications and Investor Relations at Cephalon, Inc., a
neuropharmaceutical company. Prior to 1992, Ms. Vitullo was Manager of
Healthcare Investments for Eastman Kodak, Co. Ms. Vitullo is also a director of
Cytel Corporation.
 
     Directors are elected annually and hold office until their successors are
elected and qualified, or until their earlier removal or resignation. Bruce L.
A. Carter, Ph.D. was nominated to the Board pursuant to rights held by Novo
Nordisk under the Novo Nordisk common stock purchase agreement. Nicholas J.
Lowcock and James E. Thomas were nominated to the Board pursuant to rights held
by Warburg under the Warburg/IBT Purchase Agreement, and Nicole Vitullo was
nominated to the Board pursuant to rights held by IBT under the Warburg/IBT
Purchase Agreement. See "Business -- Collaborative Arrangements" and "Certain
Transactions." There are no family relationships among the directors or
executive officers of the Company.
 
BOARD COMMITTEES
 
     The Board of Directors has a Compensation Committee and an Audit Committee.
The Compensation Committee makes recommendations to the Board concerning
salaries and incentive compensation for the Company's officers and employees.
The Audit Committee reviews the results and scope of the audit and other
accounting and related services and reviews and evaluates the Company's internal
control functions.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     The Compensation Committee of the Board of Directors consists of directors
Messrs. Penner and Thomas and Ms. Vitullo. The Compensation Committee makes
recommendations to the Board of Directors concerning salaries and incentive
compensation for employees of and consultants to the Company, except that the
Compensation Committee has full power and authority to grant stock options to
the Company's executive officers under the Company's 1988 Stock Plan. No
director or executive officer of the Company has a relationship that would
constitute an interlocking relationship with executive officers or directors of
another entity. In addition, Mr. Thomas and Ms. Vitullo are affiliates of
Warburg and IBT, respectively, and were nominated to the Board of Directors
pursuant to the Warburg/IBT Purchase Agreement. Mr. Carter is an officer of Novo
Nordisk and was nominated to the Board of Directors pursuant to the Novo Nordisk
common stock purchase agreement. See "Certain Transactions."
 
EMPLOYMENT AGREEMENTS AND CHANGE OF CONTROL ARRANGEMENTS
 
     In May 1996, the Company entered into an employment agreement with Dr.
Barry M. Sherman effective in May 1996 providing for a base salary of $250,000
per year and an option to purchase 400,000 shares of Common Stock at an exercise
price of $3.75 per share subject to a four-year vesting schedule. The term of
Dr. Sherman's employment agreement is through May 2000, subject to extension by
mutual agreement of both parties and subject to voluntary termination by Dr.
Sherman and earlier termination by the Company with or without cause. If the
Company terminates Dr. Sherman without cause or constructively terminates Dr.
Sherman, Dr. Sherman is entitled to twelve months severance pay and accelerated
vesting of the lesser of the unvested portion or one-quarter of the options
referred to above (or the lesser of the unvested portion or one-
 
                                       38
<PAGE>   41
 
half of such options if the termination occurs after a change of control). At
the end of twelve months, Dr. Sherman is eligible to receive a performance bonus
of up to twenty-five percent of his annual salary based on full or partial
completion of certain goals established by mutual agreement of Dr. Sherman and
the Board of Directors.
 
     In February 1996, the Company entered into an agreement with John W. Fara,
Ph.D., the Company's former President and Chief Executive Officer, regarding his
retirement from the Company. On May 31, 1996, Dr. Fara formally resigned as
President and Chief Executive Officer and as a director of the Company. Dr. Fara
will serve the Company on a part-time employment basis. Under the agreement, Dr.
Fara continues to receive a salary at an annual rate of $250,000 for a period of
twelve months. Dr. Fara is also eligible for bonuses for each substantial
development or license agreement that the Company enters into with certain third
parties or in the event of a sale of all or substantially all the Company's
assets, merger or consolidation of the Company with any other corporation or the
acquisition of 40% or more of the Company's outstanding Common Stock before
November 30, 1996. Dr. Fara's stock options continue to vest as long as he is
employed on a part-time basis and when he is no longer an employee all options
to acquire shares of the Company's Common Stock which were unvested as of such
date become fully exercisable.
 
     The 1995 Director Option Plan provides that upon a change in control of the
Company, the unvested portion of all outstanding options under such Plan shall
become immediately exercisable. The 1988 Stock Option Plan and the 1992
Consultant Stock Plan, each provides that in the event of a change in control of
the Company, outstanding stock options and stock purchase rights under such
Plans shall be assumed or equivalent options or rights shall be substituted by
the successor entity. If such successor corporation does not agree to such
assumption or substitution, the Company's Board of Directors must provide for
such options or rights to become immediately exercisable in full. There are no
other compensatory plans or arrangements with respect to an executive officer
that will result in payments upon resignation, retirement, or any other
termination of such executive officer's employment or from a change of control
of the Company.
 
EXECUTIVE COMPENSATION
 
     The following table sets forth the compensation paid by the Company for
each of the three years in the period ended December 31, 1995 to the Chief
Executive Officer and each other executive officer of the Company (the "Named
Executive Officers"). In May 1996, Dr. Sherman became President and Chief
Executive Officer and Dr. Fara resigned from such positions. See "-- Employment
Agreements and Change of Control Arrangements."
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                         LONG-TERM
                                                                       COMPENSATION
                                                                       -------------
                                                 ANNUAL COMPENSATION     AWARD OF
                                                 -------------------      OPTIONS           ALL OTHER
     NAME AND PRINCIPAL POSITION        YEAR      SALARY    BONUS(1)   (# OF SHARES)     COMPENSATION(3)
- --------------------------------------  ----     --------   --------   -------------     ---------------
<S>                                     <C>      <C>        <C>        <C>               <C>
John W. Fara, Ph.D....................  1995     $240,000   $50,000       225,000(2)         $ 5,674
  President and Chief Executive         1994      225,000        --            --              6,774
  Officer                               1993      205,000    40,000        50,000              6,668

John W. Varian........................  1995      135,000    45,000       130,740(2)           3,520
  Vice President, Finance and           1994      125,000        --            --              3,882
  Chief Financial Officer               1993      109,792    20,000        12,500              3,592

Jeffrey L. Winkelhake, Ph.D...........  1995      145,000    45,000       130,000(2)           3,719
  Vice President, Pharmaceutical        1994      135,000        --            --              2,948
  Development                           1993(4)    89,154    20,000        75,000              6,705
</TABLE>
 
- ---------------
(1) Represents payments for achievements of corporate objectives in 1995 and
    1993, as applicable.
 
(2) Option awards in 1995 include 75,000, 55,000 and 55,000 shares subject to
    incentive options related to 1995 officer compensation and 150,000, 75,740
    and 75,000 shares subject to incentive options issued to
 
                                       39
<PAGE>   42
 
    replace options forfeited by Dr. Fara, Mr. Varian and Dr. Winkelhake,
    respectively, in conjunction with the elective extension of exercise periods
    for options granted prior to February 1995.
 
(3) Amounts included in "All Other Compensation" for 1995 include Company
    matching contributions to the Anergen Retirement Savings Plan ("401(k)
    Contributions"), payments by the Company on term life insurance policies
    ("Life Insurance Payments"), and relocation expenses. Specifically, the
    amount stated for Dr. Fara in 1995 consists of 401(k) Contributions of
    $3,720 and Life Insurance Payments of $1,954; the amount stated for Mr.
    Varian in 1995 consists of 401(k) Contributions of $2,362 and Life Insurance
    Payments of $1,158; and the amount stated for Dr. Winkelhake in 1995
    consists of 401(k) Contributions of $2,900 and Life Insurance Payments of
    $819.
 
(4) Dr. Winkelhake joined the Company in April 1993.
 
     In February 1995, executive officers, employees and consultants had the
option to elect to extend the option exercise period for stock options granted
prior to February 1995 by four years. Elections to extend 555,113 options were
made. The following table sets forth each grant of stock options made during the
year ended December 31, 1995 to each executive officer, including 150,000,
75,740 and 75,000 shares subject to incentive options issued to replace options
forfeited by Dr. Fara, Mr. Varian and Dr. Winkelhake, respectively, in
conjunction with the elective extension of exercise periods for options granted
prior to February 1995:
 
                          OPTION GRANTS IN FISCAL 1995
 
<TABLE>
<CAPTION>
                                                   INDIVIDUAL GRANTS                      POTENTIAL REALIZABLE
                                  ----------------------------------------------------   VALUE AT ASSUMED ANNUAL
                                  NUMBER OF    % OF TOTAL                                 RATES OF STOCK PRICE
                                  SECURITIES    OPTIONS                                  APPRECIATION FOR OPTION
                                  UNDERLYING   GRANTED TO                                        TERM(3)
                                   OPTIONS     EMPLOYEES     EXERCISE OR    EXPIRATION   -----------------------
              NAME                GRANTED(1)    IN 1995     BASE PRICE(2)      DATE          5%          10%
- --------------------------------  ----------   ----------   -------------   ----------   ----------   ----------
<S>                               <C>          <C>          <C>             <C>          <C>          <C>
John W. Fara, Ph.D..............    100,000       11.9%         $9.00         10/14/01    $       0    $       0
                                     50,000        6.0           5.50         12/28/02       24,009      139,102
                                     75,000        9.0           2.75         03/17/04      288,236      545,346

John W. Varian..................     38,240        4.6           2.00         08/16/00      130,941      185,260
                                     25,000        3.0           9.00         10/14/01            0            0
                                     12,500        1.5           5.50         12/28/02        6,002       34,776
                                     25,000        3.0           2.75         03/17/04       96,079      181,782
                                     30,000        3.6           3.25         12/13/04      100,294      203,138

Jeffrey L. Winkelhake, Ph.D.....     50,000        6.0           7.75         04/07/02            0       26,602
                                     25,000        3.0           5.50         12/28/02       12,004       69,551
                                     30,000        3.6           2.75         03/17/04      115,294      218,138
                                     25,000        3.0           3.25         12/13/04       83,579      169,282
</TABLE>
 
- ---------------
(1) The listed options become exercisable as to 1/48th of the shares subject to
    the option at the end of each month after the date of grant, with full
    vesting occurring four years after the date of grant. Under the terms of the
    Company's 1988 Incentive Stock Plan, the Board of Directors retains
    discretion, subject to plan limits, to modify the terms of outstanding
    options and to reprice the options.
 
(2) The exercise price and tax withholding obligations related to exercise may
    in some cases, be paid by delivery of other shares or by offset of the
    shares subject to the options.
 
(3) The dollar amounts under these columns are the result of calculations at the
    5% and 10% rates set by the SEC and therefore are not intended to forecast
    the possible future appreciation, if any, of the Company's stock price. The
    Company did not use an alternative formula for a grant date valuation, as
    the Company does not believe that any formula will determine with reasonable
    accuracy a present value based on future unknown or volatile factors.
 
                                       40
<PAGE>   43
 
     The following table sets forth, for each of the executive officers, each
exercise of stock options during the year ended December 31, 1995 and the
year-end value of unexercised options:
 
     AGGREGATED OPTION EXERCISES IN FISCAL 1995 AND FISCAL YEAR-END VALUES
 
<TABLE>
<CAPTION>
                                                               NUMBER OF SECURITIES       VALUE(2) OF UNEXERCISED
                                   SHARES                     UNDERLYING UNEXERCISED      IN-THE-MONEY OPTIONS AT
                                 ACQUIRED ON      VALUE         OPTIONS AT YEAR-END              YEAR-END
             NAME                 EXERCISE     REALIZED(1)   EXERCISABLE/UNEXERCISABLE   EXERCISABLE/UNEXERCISABLE
- -------------------------------  -----------   -----------   -------------------------   -------------------------
<S>                              <C>           <C>           <C>                         <C>
John W. Fara, Ph.D. ...........    157,000      $ 280,889      150,220/106,780             $148,588/$91,413
John W. Varian.................          0              0       68,967/61,773               $93,074/$60,467
Jeffrey L. Winkelhake,
  Ph.D. .......................          0              0       51,471/78,529               $8,438/$61,563
</TABLE>
 
- ---------------
 
(1) Based on the closing price of the Company's Common Stock on the date of
    exercise.
 
(2) Based on a fair market value of $4.25 which was the closing price of the
    Company's Common Stock on December 29, 1995.
 
INCENTIVE STOCK PLANS
 
     1991 Employee Stock Purchase Plan. The Company's 1991 Employee Stock
Purchase Plan (the "Purchase Plan") is intended to qualify under Section 423 of
the Internal Revenue Code of 1986, as amended (the "Code"). The Purchase Plan
was amended by the Board in March 1996 and such amendment was approved by
shareholders in June 1996 to increase the number of shares available for
issuance thereunder to a total of 250,000 shares. Under the Purchase Plan, the
Company withholds a specified percentage of each salary payment to participating
employees over certain offering periods. Unless the Board of Directors or its
committee determines otherwise, each offering period runs for 24 months and is
divided into four consecutive purchase periods of six months each. The Purchase
Plan expires by its terms in 2011.
 
     The price at which stock is purchased under the Purchase Plan is equal to
85% of the fair market value of the Common Stock on the first day of the
applicable offering period or the last day of the applicable purchase period,
whichever is lower. To the extent permitted by Rule 16b-3, if the purchase price
of the Common Stock at the end of a purchase period in any offering period is
lower than the purchase price at the beginning of that offering period, then all
participants in that offering period are automatically withdrawn from that
offering period immediately after the exercise of their options and
automatically re-enrolled in the immediately following offering period.
 
     As of May 31, 1996, a total of 133,079 shares of Common Stock have been
issued to employees at an aggregate purchase price of $453,909 and a weighted
average purchase price of $3.41 per share pursuant to offerings under the
Purchase Plan and 116,921 shares remained available for future issuance under
the Purchase Plan.
 
     1988 Stock Option Plan. A total of 1,800,000 shares of the Company's Common
Stock has been reserved for issuance under the Company's 1988 Stock Option Plan
(the "Option Plan") adopted by the Board of Directors in 1988 and amended in
1990, 1991, 1992 and 1995. The Option Plan expires by its own terms in 1998. As
of May 31, 1996, options to purchase 1,259,815 shares were outstanding at a
weighted average exercise price of $4.76 per share, and options to purchase
417,457 shares had been exercised and 122,728 shares remained available for the
grant of options.
 
     The Option Plan provides for the grant of "incentive stock options" within
the meaning of Section 422 of the Code and nonqualified stock options to
employees, directors and consultants of the Company. Incentive stock options may
be granted only to employees. The Option Plan is administered by the Board of
Directors, which determines the terms of options granted, including the exercise
price, the number of shares subject to the option, and the option's
exercisability. Options granted to employees are generally immediately
exercisable, but typically vest at the rate of 6/48ths of the shares after six
months and an additional 1/48th of the shares per month thereafter. The Option
Plan requires that the exercise price of incentive stock options must be at
least equal to the fair market value of such shares on the date of grant and the
exercise price of nonqualified stock options must be at least 85% of the fair
market value of such shares on the date of the grant.
 
                                       41
<PAGE>   44
 
The maximum term of options granted under the Option Plan is ten years. With
respect to any participant who owns stock possessing more than 10% of the voting
rights or value of the Company's outstanding capital stock, the exercise price
of any option must be at least equal to 110% of the fair market value of such
shares on the date of grant and the term may be no longer than five years. In
the event of certain mergers of the Company with other entities, transfers of
voting control of the Company's capital stock or sales of all or substantially
all of the Company's assets, the Company will request that the acquiring entity
assume the Company's rights and obligations under the Option Plan or provide
similar options in substitution therefor. If the acquiring entity chooses not to
assume such rights and obligations or provide substitute options, then the
Company's Board of Directors will cause all outstanding options (together with
shares purchased upon exercise thereof) to become fully vested prior to the
event causing such acceleration and all unexercised options will terminate upon
completion of such event.
 
     1995 Director Option Plan. A total of 200,000 shares of the Company's
Common Stock has been reserved for issuance under the Company's 1995 Director
Option Plan (the "Director Plan"), adopted by the Board of Directors in 1995.
The Director Plan expires by its own terms in 2005. At May 31, 1996, options to
purchase 20,000 shares were outstanding at a weighted average exercise price of
$3.72 per share and no options had been exercised.
 
     The Director Plan provides for the grant of "nonstatutory options" to
non-employee directors of the Company. The Director Plan is administered by the
Board of Directors. All grants of options under the Director Plan are automatic
and non-discretionary pursuant to the terms of the Director Plan. Each non-
employee director is automatically granted a nonstatutory option to purchase
25,000 shares of Common Stock on the date such person first becomes a director
(provided that non-employee directors who were directors on the effective date
of the Director Plan were granted a nonstatutory option to purchase 5,000 shares
in lieu of such grant). On the first day of each fiscal year thereafter, each
incumbent non-employee director will automatically be granted a nonstatutory
option to purchase 5,000 shares of Common Stock (provided such person has served
on the Board at least six months). Options granted to directors are generally
immediately exercisable, but typically vest at the rate of 1/48th of the shares
per month after the date of grant. The Director Plan requires that the exercise
price of nonstatutory stock options is equal to the fair market value of such
shares on the date of grant. The term of options granted under the Director Plan
is ten years. In the event of certain mergers of the Company with other
entities, transfers of voting control of the Company's capital stock or sales of
all or substantially all of the Company's assets, all outstanding options shall
become fully vested.
 
     As of May 31, 1996, only Dr. Harden McConnell and Mr. Harry H. Penner, Jr.
participated in the Director Plan.
 
     1992 Consultant Stock Plan.  A total of 50,000 shares of the Company's
Common Stock has been reserved for issuance under the Company's 1992 Consultant
Stock Plan (the "Consultant Plan") adopted by the Board of Directors in 1992.
The Consultant Plan expires by its term in 2002. The Consultant Plan permits the
Company to grant "nonstatutory options" (or bonus shares) to consultants who are
not directors or officers of the Company. The Board of Directors (or a committee
thereof) administers the plan and determines, among other things, the
individuals to whom options should be granted and the terms of options granted,
including exercise price, the number of shares subject to the option and the
option's exercisability. In the event of a merger of the Company with another
entity or the sale of all or substantially all of the Company's assets, the
Company will request that the acquiring entity assume the Company's rights and
obligations under the Consultant Plan or provide similar options in exchange for
outstanding options. If the acquiring entity chooses not to assume such rights
and obligations or provide substitute options, then the Company's Board of
Directors will make such options fully exercisable for a period of fifteen days
after notice to the holders, after which time the options will terminate. At May
31, 1996, 17,465 shares had been issued and no options had been granted under
the Consultant Plan.
 
                                       42
<PAGE>   45
 
401(k) PLAN
 
     In January 1992, the Company adopted a tax-qualified employee savings and
retirement plan (the "401(k) Plan"), which generally covers all of the Company's
full-time employees who have attained age 18. Pursuant to the 401(k) Plan,
employees may elect to defer up to 15% of their current compensation (subject to
certain statutorily prescribed limits, including an annual limit of $9,240 in
1995). These deferred amounts are contributed to the 401(k) Plan. The 401(k)
Plan permits, but does not require, additional matching and Company
contributions on behalf of participants. Since the Plan's inception, the Company
has contributed an amount equal to 50% of each participant's contribution for up
to 4% of their eligible compensation. The 401(k) Plan is intended to qualify
under Sections 401(k) and 401(a) of the Code. Contributions to such a qualified
plan are deductible to the Company when made and neither the contributions nor
the income earned on those contributions is taxable to participants until
withdrawn. All 401(k) Plan contributions are credited to separate accounts
maintained in trust by two individual trustees. Contributions are invested, at
the participant's direction, in one or more of the investment funds available
under the 401(k) Plan. All account balances are adjusted at least annually to
reflect the investment earnings and losses of the trust fund. Each participant
is fully vested in his or her salary deferral accounts under the 401(k) Plan.
Distributions may be made from a participant's account pursuant to the 401(k)
Plan's hardship withdrawal provisions as well as upon a participant's
termination of employment, disability or attainment of age 59 1/2. Distributions
will be in the form of a lump sum, installment payments or an annuity, in the
participant's discretion. Federal tax laws limit the amount that may be added to
a participant's accounts for any one year under a qualified plan such as the
401(k) Plan to the lesser of (i) $30,000 or (ii) 25% of the participant's
compensation (net of salary deferral contributions) for the year.
 
LIMITATIONS ON DIRECTORS' LIABILITIES AND INDEMNIFICATION
 
     The Company's Articles of Incorporation and Bylaws provide for
indemnification of the officers and directors of the Company to the full extent
permitted by California law. The General Corporation Law of the State of
California permits a corporation to limit, under certain circumstances, a
director's liability for monetary damages in actions brought by or in the right
of the corporation. The Company's Articles of Incorporation also provide for the
elimination of the liability of directors for monetary damages to the full
extent permitted by law.
 
     The Company has entered into agreements to indemnify its directors and
officers in addition to the indemnification provided for in the Articles of
Incorporation and Bylaws. These agreements will, among other things, indemnify
the Company's directors and officers for certain expenses (including attorneys'
fees), judgments, fines and settlement amounts incurred in any action or
proceeding, including any action by or in the right of the Company, on account
of services as a director or officer of any other enterprise to which the person
provides services at the request of the Company. The Company believes that these
provisions and agreements are necessary to attract and retain qualified persons
as directors and officers. The Company currently maintains a directors' and
officers' insurance policy. At present, there is no pending litigation or
proceeding involving a director, officer or employee of the Company as to which
indemnification is sought, nor is the Company aware of any threatened litigation
or proceeding that may result in claims for indemnification.
 
                                       43
<PAGE>   46
 
                              CERTAIN TRANSACTIONS
 
     In March 1995, the Company, Warburg and IBT (collectively, the
"Purchasers") entered into the Warburg/IBT Purchase Agreement pursuant to which
the Purchasers agreed to purchase 7,317,073 shares of Common Stock from the
Company for approximately $15 million. This transaction was approved by the
Company's shareholders and was completed on April 13, 1995. The Purchasers have
the right at any time after October 13, 1997 to request the Company to effect a
registration of at least 30% of the aggregate number of shares held by the
requesting Purchaser or any lesser percentage if the aggregate net offering
price would exceed $1,000,000. The Purchasers also have the right to have their
shares included in a registration by the Company of its securities for its own
account or the account of any of its shareholders. The Purchasers have certain
rights of representation on the Company's Board of Directors based on certain
minimum levels of ownership of the Company's Common Stock. Under the Warburg/IBT
Purchase Agreement, the Company is currently obligated to include in the slate
of nominees recommended by the Board of Directors and management at each
election of directors two candidates selected by Warburg, one candidate selected
by IBT and one candidate as mutually agreed to by IBT and Warburg. Upon the
closing of this transaction, the Board of Directors appointed to the Board to
fill vacancies two new members representing Warburg, Mr. Nicholas J. Lowcock and
Mr. James E. Thomas, and one new member representing IBT, Ms. Nicole Vitullo.
These three individuals have been reelected to the Board at the annual meeting
of shareholders in June 1996. Mr. Thomas and Ms. Vitullo are affiliates of
Warburg and IBT, respectively. It is expected that during the next fiscal year
IBT and Warburg may identify an appropriate industry representative for
nomination to the Board pursuant to their right to mutually designate such
candidate under the Warburg/IBT Purchase Agreement.
 
     In March 1996, the Company and Novo Nordisk agreed to expand their
collaborative research and development agreement to establish certain milestones
for products developed under the agreement targeting IDDM and to extend the term
of the development program by an additional two-year period through August 1998.
See "Business -- Collaborative Arrangements -- Novo Nordisk A/S." Bruce L.A.
Carter, the Corporate Executive Vice President and Chief Scientific Officer of
Novo Nordisk, has served as a director of the Company since February 1994
pursuant to rights under the Novo Nordisk Purchase Agreement.
 
     In May 1996, the Company entered into an employment agreement with Dr.
Barry M. Sherman, President and Chief Executive Officer and a director of the
Company. In February 1996, the Company entered into an agreement with John W.
Fara, Ph.D., the Company's former President and Chief Executive Officer. See
"Management -- Employment Agreements and Change of Control Arrangements."
 
                                       44
<PAGE>   47
 
                             PRINCIPAL STOCKHOLDERS
 
     The following table sets forth information known to the Company with
respect to the beneficial ownership of the Common Stock as of April 30, 1996,
and as adjusted to reflect the sale of Common Stock offered hereby, for (i) each
person who is known by the Company to own beneficially more than 5% of the
Common Stock, (ii) each of the Company's directors, (iii) each executive officer
named in the Summary Compensation Table and (iv) all directors and executive
officers as a group.
 
<TABLE>
<CAPTION>
                                                   NO. OF SHARES                 PERCENTAGE(2)
                                                   BENEFICIALLY      --------------------------------------
                     NAME(1)                           OWNED         % BEFORE OFFERING     % AFTER OFFERING
- -------------------------------------------------  -------------     -----------------     ----------------
<S>                                                <C>               <C>                   <C>
Warburg, Pincus Ventures, L.P.(3)................    4,878,049             32.4%                 25.6%
  466 Lexington Avenue
  New York, NY 10017
Warburg, Pincus & Co.(4).........................    4,878,049             32.4%                 25.6%
  466 Lexington Avenue
  New York, NY 10017
International Biotechnology Trust PLC............    2,439,024             16.2%                 12.8%
  Five Arrows House
  St. Swithin's Lane
  London, EC4N 8NR
  England
Novo Nordisk A/S.................................    1,219,745              8.1%                  6.4%
  Novo Alle
  2880 Basgvaerd
  Denmark
John W. Fara, Ph.D.(5)...........................      347,212              2.3%                  1.8%
Barry M. Sherman, M.D.(6)........................       16,667                 *                     *
John W. Varian(7)................................      100,350                 *                     *
Jeffrey Winkelhake, Ph.D.(8).....................       64,349                 *                     *
Bruce L.A. Carter, Ph.D.(9)......................    1,219,745              8.1%                  6.4%
Harden M. McConnell, Ph.D.(10)...................       37,776                 *                     *
Harry H. Penner, Jr.(11).........................       22,502                 *                     *
James E. Thomas(12)..............................    4,878,049             32.4%                 25.6%
Nicholas J. Lowcock(13)..........................            0                --                    --
Nicole Vitullo(14)...............................            0                --                    --
All directors and officers as a group (10
  persons)(15)...................................    6,686,650             43.4%                 34.5%
</TABLE>
 
- ---------------
  *  Represents less than 1% of the outstanding Common Stock.
 
 (1) The persons named in the table, to the Company's knowledge, have sole
     voting and investment power with respect to all shares of Common Stock
     shown as beneficially owned by them, subject to community property laws
     where applicable and the information contained in the footnotes hereunder.
 
 (2) Applicable percentage of ownership is based on 15,063,180 and 19,063,180
     shares of Common Stock outstanding as of April 30, 1996 before and after
     the proposed offering, respectively, on a pro forma basis, together with
     applicable options and warrants held by such stockholder. Beneficial
     ownership is determined in accordance with the rules of the Securities and
     Exchange Commission, and includes voting and investment power with respect
     to shares. Shares of Common Stock subject to options exercisable within 60
     days of April 30, 1996 are deemed outstanding for computing the percentage
     ownership of the person holding such options, but are not deemed
     outstanding for computing the percentage ownership of any other person.
 
 (3) The sole general partner of Warburg, Pincus Ventures, L.P. ("Warburg") is
     Warburg, Pincus & Co., a New York general partnership ("WP"). Lionel I.
     Pincus is the managing partner of WP and may be deemed to control it. E.M.
     Warburg, Pincus & Company, a New York general partnership
 
                                       45
<PAGE>   48
 
     ("E.M. Warburg"), manages Warburg. WP has a 15% interest in the profits of
     Warburg as the general partner, and also owns approximately 1.5% of the
     limited partnership interests in Warburg.
 
 (4) Represents shares held by Warburg. As the sole general partner of Warburg
     (as described in footnote 3 above), WP may be deemed to be a beneficial
     owner (within the meaning of Rule 13d-3 under the Securities Exchange Act
     of 1934) of the shares held by Warburg.
 
 (5) Includes 146,342 shares subject to options exercisable within 60 days of
     April 30, 1996.
 
 (6) Includes 16,667 shares subject to options exercisable within 60 days of
     April 30, 1996. Dr. Sherman joined the Company as President and Chief
     Executive Officer and as a director of the Company in May 1996.
 
 (7) Includes 81,571 shares subject to options exercisable within 60 days of
     April 30, 1996.
 
 (8) Includes 63,142 shares subject to options exercisable within 60 days of
     April 30, 1996.
 
 (9) Includes 1,219,745 shares held by Novo Nordisk, of which Dr. Carter is an
     executive officer. Dr. Carter disclaims beneficial ownership of these
     shares.
 
(10) Includes 14,376 shares subject to options exercisable within 60 days of
     April 30, 1996.
 
(11) Includes 17,502 shares subject to options exercisable within 60 days of
     April 30, 1996.
 
(12) Represents shares held by Warburg. Mr. Thomas, a director of the Company,
     is a Managing Director of E.M. Warburg, Pincus & Co., Inc., a wholly-owned
     subsidiary of WP ("EMW"), and a general partner of WP and E.M. Warburg. As
     such, Mr. Thomas may be deemed to have an indirect pecuniary interest
     (within the meaning of Rule 16a-1 under the Securities Exchange Act of
     1934) in an indeterminate portion of the shares beneficially owned by
     Warburg and WP. Mr. Thomas disclaims beneficial ownership of these shares
     within the meaning of Rule 13d-3 under the Securities Exchange Act of 1934.
 
(13) Does not include shares held by Warburg. Mr. Lowcock is employed by EMW and
     is a director of the Company. Mr. Lowcock disclaims beneficial ownership of
     the shares held by Warburg and WP.
 
(14) Does not include shares held by IBT. Ms. Vitullo, a director of the
     Company, is an employee of Rothschild, Inc., a corporation affiliated with
     Rothschild Asset Management, Ltd., investment manager for IBT. Ms. Vitullo
     disclaims beneficial ownership of the shares of IBT.
 
(15) Includes 339,600 shares subject to options exercisable within 60 days of
     April 30, 1996. Reflects the shares of Warburg of which Mr. Thomas may be
     deemed to have an indirect pecuniary interest (within the meaning of Rule
     16a-1 of the Securities Exchange Act of 1934) and the shares of Novo
     Nordisk of which Dr. Carter is an executive officer. Does not reflect
     beneficial ownership of Mr. Lowcock of Warburg and Ms. Vitullo of IBT who
     each disclaim beneficial ownership of the shares held by their respective
     entities. Also includes shares beneficially held by Dr. Sherman, who joined
     the Company as President and Chief Executive Officer and as a director in
     May 1996.
 
                                       46
<PAGE>   49
 
                          DESCRIPTION OF CAPITAL STOCK
 
     The authorized capital stock of the Company consists of 40,000,000 shares
of Common Stock and 10,000,000 shares of Preferred Stock. At May 31, 1996, there
were 15,066,042 shares of Common Stock outstanding, held by 375 shareholders of
record. At May 31, 1996, options to purchase an aggregate of 1,279,815 shares
and warrants to purchase an aggregate of 459,015 shares of Common Stock were
outstanding. See "Management -- Incentive Stock Plans" and "Certain
Transactions."
 
COMMON STOCK
 
     Each holder of Common Stock is entitled to one vote for each share held.
The holders of Common Stock, voting as a single class, are entitled to elect all
of the directors. Although California law generally permits holders of Common
Stock to cumulate votes for the election of directors upon giving notice as
required by law, the Articles of Incorporation provide, as permitted by
California law, that the right to cumulate votes will be eliminated if the
Company has at least 800 holders of its equity securities as of the record date
of the Company's most recent annual meeting of shareholders. The Company
believes it has more than 800 shareholders. The elimination of cumulative voting
will have the effect of making it more difficult for a minority shareholder to
elect a member of the board of directors because while an owner of just over 15%
of the outstanding shares could currently elect a director, after the
elimination of cumulative voting, more than 50% ownership of the Company is
required to guarantee election of a director. The Common Stock is not
convertible into any other security.
 
     Holders of Common Stock are entitled to receive ratably such dividends as
may be declared by the Board of Directors out of funds legally available
therefor. See "Dividend Policy." In the event of a liquidation, dissolution or
winding up of the Company, holders of Common Stock would be entitled to share in
the Company's assets remaining after the payment of liabilities and the
satisfaction of any liquidation preference granted the holders of any
outstanding shares of Preferred Stock. The Common Stock has no preemptive or
other subscription rights. The outstanding shares of Common Stock are, and the
Common Stock offered hereby will be when issued, fully paid and nonassessable.
 
PREFERRED STOCK
 
     The Board of Directors has the authority, without further action by
shareholders, to issue up to 10,000,000 shares of Preferred Stock in one or more
series, and to fix the designations, rights, preferences, privileges,
qualifications and restrictions thereof, including dividend rights, conversion
rights, voting rights, rights and terms of redemption, liquidation preferences
and sinking fund terms, any or all of which may be greater than the rights of
the Common Stock. The Board of Directors, without shareholder approval, can
issue Preferred Stock with voting, conversion and other rights which could
adversely affect the voting power and other rights of the holders of Common
Stock. Preferred Stock could thus be issued quickly with terms calculated to
delay or prevent a change in control of the Company or to make removal of
management more difficult. In certain circumstances, such issuance could have
the effect of decreasing the market price of the Common Stock. The issuance of
Preferred Stock may have the effect of delaying, deterring or preventing a
change in control of the Company without any further action by the shareholders.
The Company has no present plan to issue any shares of Preferred Stock.
 
WARRANTS
 
     In connection with its initial public offering on October 10, 1991, the
Company sold warrants to the underwriters of its initial public offering (the
"Representative's Warrants") to purchase from the Company up to 196,656 shares
of Common Stock at an exercise price per share equal to $5.98 per share, subject
to adjustment. The Representative's Warrants are exercisable until October 9,
1996, and are not transferable except to officers of the Representative and
certain successors in interest of the Representative. In addition, the Company
has granted certain rights to the holders of the Representative's Warrants to
register the Common Stock underlying the Representative's Warrants under the
Securities Act.
 
                                       47
<PAGE>   50
 
     In connection with a facilities and equipment financings, the Company
issued warrants to purchase 16,919 and 8,577 shares of Common Stock at $9.93 and
$5.83, respectively, subject to adjustment ("MMC Warrants"). The 16,919 share
MMC Warrant is exercisable at any time until December 29, 1999 and the 8,577
share MMC Warrant is exercisable at any time until December 30, 2000.
 
     In connection with a Securities Purchase Agreement entered into on May 11,
1994 (the "1994 Purchase Agreement"), the Company issued warrants to a group of
private investors to purchase 236,863 shares of the Company's Common Stock at an
exercise price of $3.52 per share, subject to adjustment. These warrants are
exercisable at any time until June 30, 1997. The Company may redeem the warrants
after June 30, 1996 if the closing price of the Company's Common Stock as quoted
on the Nasdaq National Market exceeds the exercise price by 150% for ten days
within a period of 20 consecutive trading days.
 
REGISTRATION RIGHTS OF CERTAIN HOLDERS
 
     Warburg and IBT (collectively the "Purchasers"), who in the aggregate hold
7,317,073 shares of Common Stock, are entitled to certain rights with respect to
the registration of such shares under the Securities Act. These rights are
provided under the terms of the Warburg/IBT Purchase Agreement. Subject to
certain limitations in the agreement, the Purchasers have the right at any time
after October 13, 1997 to request the Company to effect a registration of at
least 30% of the aggregate number of shares held by the requesting Purchaser or
any lesser percentage if the aggregate net offering price would exceed
$1,000,000. The Purchasers also have the right to have their shares included in
a registration by the Company of its securities for its own account or the
account of any of its shareholders.
 
     The MMC Warrants grant the holders thereof registration rights which are in
pari passu with certain registration rights of the holders of Registrable
Securities. If the Company registers any of its Common Stock either for its own
account or for the account of other security holders, the holders of the MMC
Warrants are entitled to include the shares issuable upon exercise of such MMC
Warrants in the registration, subject to the ability of the underwriters to
limit the number of shares included in the offering and provided that the
Company does not in good faith determine that the incremental cost and effort in
so doing is significant.
 
     Additionally, the Representative's Warrants provide certain rights with
respect to the registration under the Securities Act of the 196,656 shares
issuable upon exercise thereof (the "Warrant Shares"). The holders of at least
50% of the Warrant Shares may require on one occasion that the Company use its
best efforts to register the Warrant Shares for public resale. Until October 9,
1996, if the Company registers any of its Common Stock either for its own
account for the account of other security holders, the holders of the Warrant
Shares are entitled to include their shares of Common Stock in the registration.
 
     Novo Nordisk has the right at any time after August 17, 1996 to require
that the Company use its best efforts to register any shares of Common Stock
held by Novo Nordisk for public resale. The right is provided under the Novo
Nordisk common stock purchase agreement. Novo Nordisk may require the Company on
no more than one occasion every six months to effect such a registration. Novo
Nordisk must bear all of the out-of-pocket expenses incurred by the Company in
connection with such a registration unless Form S-3 is not available, in which
case the Company shall bear all registration expenses. The Company, however,
shall not be required to effect such registration if in the reasonable opinion
of counsel, Novo Nordisk's shares of Common Stock may be sold in the public
market under the Securities Act without registration.
 
     Under the 1994 Purchase Agreement, $1.5 million was received by the Company
from two purchasers in exchange for 413,965 shares of Common Stock and warrants
to purchase an additional 236,863 shares of Common Stock at an exercise price of
$3.52 per share, subject to adjustment. The Company is obligated to register at
the Company's expense the 236,863 shares of Common Stock issuable upon exercise
of such warrants if so requested by the warrant holders.
 
     Except as otherwise noted, all registration expenses must be borne by the
Company and all selling expenses must be borne by the holders of the securities
being registered.
 
                                       48
<PAGE>   51
 
TRANSFER AGENT AND REGISTRAR
 
     The transfer agent and registrar for the Common Stock is Chemical Trust
Company of California.
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
     Future sales of substantial amounts of the Company's Common Stock in the
public market by existing shareholders could adversely affect the market price
of the Company's Common Stock. Upon the completion of this offering, the Company
will have 19,066,042 shares of Common Stock outstanding, assuming no exercise of
outstanding options or warrants after May 31, 1996. Approximately 18,652,077 of
the shares (including the 4,000,000 shares sold in this offering) are eligible
for immediate sale in the public market without restriction, although shares
held by persons who may be deemed affiliates are subject to volume restrictions
applicable to affiliates under Rule 144. As of May 31, 1996, 8,786,074 shares
were held by persons who may be deemed affiliates under Rule 144. In addition,
1,279,815 shares of Common Stock were subject to options outstanding as of May
31, 1996, and 451,300 of these shares were fully vested. Upon exercise of the
currently vested portion of such options, all shares will be eligible for
immediate sale in the public market, subject to Rule 144 volume restrictions
applicable to affiliates. As of May 31, 1996, there were 459,015 shares of
Common Stock subject to warrants which, upon exercise of such warrants, may be
freely tradeable pursuant to Rule 144 or as a result of registration pursuant to
registration rights. The Commission has recently proposed to reduce the Rule 144
holding periods. If enacted, such modification will have a material effect on
the timing of when shares of the Company's Common Stock become eligible for
resale.
 
     The Company's directors, executive officers, certain principal
stockholders, who in the aggregate hold 9,125,674 of the shares of Common Stock
or securities convertible into Common Stock of the Company outstanding
immediately prior to the completion of this offering, have entered into lock-up
agreements under which they have agreed not to offer, sell, contract to sell,
grant any option to purchase or otherwise dispose of, or agree to dispose of,
directly or indirectly, any shares of Common Stock, options or warrants to
acquire shares of Common Stock or securities exchangeable for or convertible
into Common Stock owned by them for a period of 90 days after the date of this
Prospectus, without the prior written consent of PaineWebber Incorporated. The
Company has entered into a similar agreement, except that the Company may grant
options and issue stock under its current stock option and stock purchase plans
and pursuant to other currently outstanding options. See "Risk Factors -- Future
Requirements for Significant Additional Capital."
 
     Upon expiration of the lock-up agreements, approximately 9,164,112 shares
of Common Stock (including approximately 378,038 shares subject to outstanding
vested options) will become eligible for immediate public resale, subject in
some cases to vesting provisions and volume limitations pursuant to Rule 144.
The number of shares sold in the public market could increase if holders subject
to volume restrictions exercise their registration rights.
 
     In general, under Rule 144 as currently in effect, a person (or persons
whose shares are aggregated) who has beneficially owned shares for at least two
years (including the holding period of any prior owner, except an affiliate) is
entitled to sell in "broker's transactions" or to market makers, within any
three-month period commencing 90 days after the date of this Prospectus, a
number of shares that does not exceed the greater of (i) one percent of the
number of shares of Common Stock then outstanding (approximately 190,632 shares
immediately after this offering) or (ii) the average weekly trading volume of
the Common Stock during the four calendar weeks preceding the required filing of
a Form 144 with respect to such sale. Sales under Rule 144 are generally subject
to certain manner of sale provisions and notice requirements and to the
availability of current public information about the Company. Under Rule 144(k),
a person who is not deemed to have been an affiliate of the Company at any time
during the 90 days preceding a sale, and who has beneficially owned the shares
proposed to be sold for at least three years, is entitled to sell such shares
without having to comply with the manner of sale, public information, volume
limitation or notice provisions of Rule 144. Under Rule 701 under the Securities
Act, persons who purchase shares upon exercise of options
 
                                       49
<PAGE>   52
 
granted prior to the effective date of this offering are entitled to sell such
shares 90 days after the effective date of this offering in reliance on Rule
144, without having to comply with the holding period requirements of Rule 144
and, in the case of non-affiliates, without having to comply with the public
information, volume limitation or notice provisions of Rule 144. See "Risk
Factors -- Shares Eligible for Future Sale; Registration Rights."
 
                                       50
<PAGE>   53
 
                                  UNDERWRITING
 
     The Underwriters named below, for whom PaineWebber Incorporated and Vector
Securities International, Inc. are acting as Representatives (the
"Representatives"), have severally agreed, subject to the terms and conditions
of the Underwriting Agreement among the Company and the Representatives (the
"Underwriting Agreement"), to purchase from the Company, and the Company has
agreed to sell to the Underwriters, the number of shares of Common Stock set
forth opposite each Underwriter's name in the following table.
 
<TABLE>
<CAPTION>
                                                                                 NUMBER
                                   UNDERWRITER                                  OF SHARES
    --------------------------------------------------------------------------  ---------
    <S>                                                                         <C>
    PaineWebber Incorporated..................................................
    Vector Securities International, Inc......................................
                                                                                ---------
              Total...........................................................  4,000,000
                                                                                =========
</TABLE>
 
     In the Underwriting Agreement, the several Underwriters have agreed,
subject to certain conditions, to purchase all of the shares of Common Stock
being sold pursuant to such Agreement (other than those covered by the
over-allotment option described below), if any are purchased. The Underwriting
Agreement provides that, in the event of a default by an Underwriter, in certain
circumstances, the purchase commitments of non-defaulting Underwriters may be
increased or the Underwriting Agreement may be terminated.
 
     The Company has been advised by the Representatives that the Underwriters
propose to offer the shares of Common Stock to the public at the price to the
public set forth on the cover page of this Prospectus, and in part to certain
securities dealers (who may include Underwriters) at such price less a
concession not in excess of $
per share and that the Underwriters and such dealers may reallow a discount not
in excess of $     per share to the other dealers, including the Underwriters.
After the closing of the public offering, the public offering price, the
concession to selected dealers and the discounts to other dealers may be changed
by the Representatives.
 
     The Company has granted to the Underwriters an option, exercisable during
the 30-day period after the date of this Prospectus, under which the
Underwriters may purchase up to an additional 600,000 shares of Common Stock
from the Company at the price to the public set forth on the cover page of this
Prospectus less the underwriting discounts and commissions. The Underwriters may
exercise the option solely for the purpose of covering over-allotments, if any.
To the extent such option is exercised, each Underwriter will become obligated,
subject to certain conditions, to purchase approximately the same percentage of
such additional shares of Common Stock as it was obligated to purchase pursuant
to the Underwriting Agreement.
 
     The Company, its directors and officers and 5% or greater stockholders of
the Company have agreed not to offer, sell, contract to sell or otherwise
dispose of any shares of Common Stock, or rights to acquire shares of Common
Stock, for a period of 90 days after the date of this Prospectus without the
prior written consent of PaineWebber Incorporated.
 
     The Company has agreed to indemnify the Underwriters against certain
liabilities, including liabilities under the Securities Act, or to contribute to
payments the Underwriters may be required to make in respect thereof.
 
     In connection with this offering, certain Underwriters may engage in
passive market making transactions in the Common Stock on Nasdaq immediately
prior to the commencement of sales in this offering, in accordance with Rule
10b-6A under the Exchange Act. Passive market making consists of displaying bids
on Nasdaq limited by the bid prices of independent market makers for a security
and making purchases of a security which are limited by such prices and effected
in response to order flow. Net purchases by a passive market maker on each day
are limited to a specified percentage of the passive market maker's average
daily trading volume in the Common Stock during a specified prior period and
must be discontinued when such
 
                                       51
<PAGE>   54
 
limit is reached. Passive market making may stabilize the market price of the
Common Stock at a level above that which might otherwise prevail and, if
commenced, may be discontinued at any time.
 
                                 LEGAL MATTERS
 
     The validity of the Common Stock offered hereby will be passed upon for the
Company by Wilson Sonsini Goodrich & Rosati, Professional Corporation, Palo
Alto, California. Certain legal matters in connection with this offering will be
passed upon for the Underwriters by Shearman & Sterling, San Francisco,
California.
 
                                    EXPERTS
 
     The financial statements of Anergen, Inc. at December 31, 1994 and 1995,
and for each of the three years in the period ended December 31, 1995, appearing
in this Prospectus and Registration Statement have been audited by Ernst & Young
LLP, independent auditors, as set forth in their report thereon appearing
elsewhere herein and in the Registration Statement, and are included in reliance
upon such report given upon the authority of such firm as experts in accounting
and auditing.
 
     Portions of this Prospectus entitled "Risk Factors -- Uncertainty Relating
to Patents and Proprietary Rights" and "Business -- Patents and Proprietary
Rights," except for the second and ninth paragraphs thereof, have been reviewed
and approved by Townsend and Townsend and Crew LLP, as experts in patent law,
and are included herein in reliance upon their review and approval.
 
                             ADDITIONAL INFORMATION
 
     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and, in accordance
therewith, files reports and other information with the Securities and Exchange
Commission (the "Commission"). Reports, proxy and information statements filed
by the Company with the Commission pursuant to the informational requirements of
the Exchange Act may be inspected and copied at the public reference facilities
maintained by the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,
and at the following Regional Offices of the Commission: New York Regional
Office, 26 Federal Plaza, Room 1102, New York, New York 10007; and Chicago
Regional Office, Everett McKinley Dirksen Building, 219 South Dearborn Street,
Room 1204, Chicago, Illinois 60604. Copies of such material may be obtained from
the Public Reference Section of the Commission at 450 Fifth Street, N.W.,
Washington D.C. 20549, at prescribed rates. In addition, reports, proxy
statements and other information concerning the Company (symbol: ANRG) can be
inspected and copied at the offices of the Nasdaq National Market, Nasdaq
Operations, 1735 K Street, N.W., Washington, D.C. 20006, on which the Common
Stock of the Company is quoted.
 
     The Company has filed with the Commission a Registration Statement under
the Securities Act with respect to the shares of Common Stock offered hereby.
This Prospectus does not contain all the information set forth in the
Registration Statement and the exhibits and schedules thereto. For further
information with respect to the Company and such Common Stock, reference is made
to the Registration Statement and to the exhibits and schedules filed therewith.
Statements contained in this Prospectus as to the contents of any contract or
other document referred to are not necessarily complete, and in each instance
reference is made to the copy of such contract or other document filed as an
exhibit to the Registration Statement, each such statement being qualified in
all respects by such reference. A copy of the Registration Statement may be
inspected without charge at the offices of the Commission at 450 Fifth Street,
N.W., Washington, D.C. 20549, and copies of all or any part thereof may be
obtained from the Public Reference Section of the Commission upon the payment of
the fees prescribed by the Commission.
 
                                       52
<PAGE>   55
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                         ITEM                                           PAGE
- --------------------------------------------------------------------------------------  ----
<S>                                                                                     <C>
Report of Independent Auditors........................................................  F-2
Audited Financial Statements
Balance Sheets at December 31, 1994 and 1995 and March 31, 1996 (unaudited)...........  F-3
Statements of Operations for each of the three years in the period ended December 31,
  1995 and the three months ended March 31, 1995 and 1996 (unaudited).................  F-4
Statement of Shareholders' Equity for each of the three years in the period ended
  December 31, 1995 and for the three months ended March 31, 1996 (unaudited).........  F-5
Statements of Cash Flows for each of the three years in the period ended December 31,
  1995 and the three months ended March 31, 1995 and 1996 (unaudited).................  F-6
Notes to Financial Statements.........................................................  F-7
</TABLE>
 
                                       F-1
<PAGE>   56
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Directors and Shareholders
Anergen, Inc.
 
     We have audited the accompanying balance sheets of Anergen, Inc. as of
December 31, 1994 and 1995, and the related statements of operations,
shareholders' equity, and cash flows for each of the three years in the period
ended December 31, 1995. 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 Anergen, Inc. at December
31, 1994 and 1995, and the results of its operations and its cash flows for each
of the three years in the period ended December 31, 1995, in conformity with
generally accepted accounting principles.
 
                                                               ERNST & YOUNG LLP
 
San Francisco, California
February 9, 1996
 
                                       F-2
<PAGE>   57
 
                                 ANERGEN, INC.
 
                                 BALANCE SHEETS
                      (IN THOUSANDS EXCEPT SHARE AMOUNTS)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                            ---------------------
                                                              1994         1995
                                                            --------     --------      MARCH 31,
                                                                                         1996
                                                                                      -----------
                                                                                      (UNAUDITED)
<S>                                                         <C>          <C>          <C>
Current assets:
  Cash and equivalents....................................  $  1,248     $    468      $     310
  Short-term investments..................................     2,508       11,024          9,343
  Contract receivables-related party......................       592          815            783
  Prepaid expenses........................................       178          102            103
                                                            --------     --------       --------
          Total current assets............................     4,526       12,409         10,539
Property and equipment, net...............................     2,251        2,010          1,886
Other assets..............................................        20           36             36
                                                            --------     --------       --------
                                                            $  6,797     $ 14,455      $  12,461
                                                            ========     ========       ========
                              LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
  Accounts payable and accrued liabilities................  $    977     $  1,040      $     889
  Current portion of capital lease obligations and debt...       960          883            746
                                                            --------     --------       --------
          Total current liabilities.......................     1,937        1,923          1,635
Long-term portion of capital lease obligations and debt...       990          818            636
Commitments
Shareholders' equity:
  Preferred stock, no par value; 10,000,000 shares
     authorized; none issued and outstanding..............        --           --             --
  Common stock, no par value; 40,000,000 shares
     authorized; 7,438,495 and 14,967,680 shares issued
     and outstanding at December 31, 1994 and 1995,
     respectively (15,029,430 shares at March 31, 1996
     (unaudited)).........................................    32,572       47,359         47,400
  Additional paid-in capital..............................       648          648            648
  Deferred compensation...................................       (36)          --             --
  Unrealized gain (loss) on investments...................       (91)          16            (18)
  Accumulated deficit.....................................   (29,223)     (36,309)       (37,840)
                                                            --------     --------       --------
          Total shareholders' equity......................     3,870       11,714         10,190
                                                            --------     --------       --------
                                                            $  6,797     $ 14,455      $  12,461
                                                            ========     ========       ========
</TABLE>
 
                            See accompanying notes.
 
                                       F-3
<PAGE>   58
 
                                 ANERGEN, INC.
 
                            STATEMENTS OF OPERATIONS
                    (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                     YEARS ENDED               THREE MONTHS ENDED
                                                    DECEMBER 31,                    MARCH 31,
                                           -------------------------------     -------------------
                                            1993        1994        1995        1995        1996
                                           -------     -------     -------     -------     -------
                                                                                   (UNAUDITED)
<S>                                        <C>         <C>         <C>         <C>         <C>
Revenues:
  Contract revenues-related party........  $   339     $ 2,325     $ 3,001     $   551     $   783
  Interest income........................      312         207         533          17         139
                                           -------     -------     -------     -------     -------
          Total revenues.................      651       2,532       3,534         568         922
                                           -------     -------     -------     -------     -------
Expenses:
  Research and development...............    5,553       7,423       8,322       1,898       1,895
  General and administrative.............    1,716       1,831       1,976         462         503
  Interest expense.......................      226         238         322          71          55
                                           -------     -------     -------     -------     -------
          Total expenses.................    7,495       9,492      10,620       2,431       2,453
                                           -------     -------     -------     -------     -------
Net loss.................................  $(6,844)    $(6,960)    $(7,086)    $(1,863)    $(1,531)
                                           =======     =======     =======     =======     =======
Net loss per share.......................  $ (1.12)    $ (0.97)    $ (0.55)    $ (0.25)    $ (0.10)
                                           =======     =======     =======     =======     =======
Shares used in calculating per share
  data...................................    6,118       7,202      12,859       7,527      14,984
                                           =======     =======     =======     =======     =======
</TABLE>
 
                            See accompanying notes.
 
                                       F-4
<PAGE>   59
 
                                 ANERGEN, INC.
 
                       STATEMENTS OF SHAREHOLDERS' EQUITY
                      (IN THOUSANDS EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                         ADDITIONAL                    UNREALIZED                       TOTAL
                                   PREFERRED   COMMON     PAID-IN       DEFERRED     GAIN(LOSS) ON    ACCUMULATED   SHAREHOLDERS'
                                     STOCK      STOCK     CAPITAL     COMPENSATION    INVESTMENTS       DEFICIT        EQUITY
                                   ---------   -------   ----------   ------------   --------------   -----------   -------------
<S>                                <C>         <C>       <C>          <C>            <C>              <C>           <C>
BALANCE, DECEMBER 31, 1992.......   $    --    $22,929      $648         $ (301)          $ --         $ (15,419)      $ 7,857
Issuance of 1,219,745 shares of
  common stock to Novo Nordisk
  A/S............................        --      8,000        --             --             --                --         8,000
Issuance of common stock to
  employees under option and
  purchase plans.................        --        175        --             --             --                --           175
Amortization of deferred
  compensation...................        --         --        --            133             --                --           133
Unrealized gain(loss) on
  investments
  available-for-sale.............        --         --        --             --            (70)               --           (70)
Net loss.........................        --         --        --             --             --            (6,844)       (6,844)
                                      -----    -------      ----          -----           ----          --------       -------
BALANCE, DECEMBER 31, 1993.......        --     31,104       648           (168)           (70)          (22,263)        9,251
Issuance of 413,965 shares of
  common stock and 236,863
  warrants to private investors,
  net............................        --      1,370        --             --             --                --         1,370
Issuance of common stock to
  employees under option and
  purchase plans.................        --         98        --             --             --                --            98
Amortization of deferred
  compensation...................        --         --        --            132             --                --           132
Unrealized gain(loss) on
  investments
  available-for-sale.............        --         --        --             --            (21)               --           (21)
Net loss.........................        --         --        --             --             --            (6,960)       (6,960)
                                      -----    -------      ----          -----           ----          --------       -------
BALANCE, DECEMBER 31, 1994.......        --     32,572       648            (36)           (91)          (29,223)        3,870
Issuance of 7,317,073 shares of
  common stock in follow-on
  offering, net..................        --     14,651        --             --             --                --        14,651
Issuance of common stock to
  employees under option and
  purchase plans.................        --        136        --             --             --                --           136
Amortization of deferred
  compensation...................        --         --        --             36             --                --            36
Unrealized gain(loss) on
  investments
  available-for-sale.............        --         --        --             --            107                --           107
Net loss.........................        --         --        --             --             --            (7,086)       (7,086)
                                      -----    -------      ----          -----           ----          --------       -------
BALANCE, DECEMBER 31, 1995.......        --     47,359       648             --             16           (36,309)       11,714
Issuance of common stock to
  employees under option and
  purchase plans (unaudited).....        --         41        --             --             --                --            41
Unrealized gain(loss) on
  investments available-for-sale
  (unaudited)....................        --         --        --             --            (34)               --           (34)
Net loss (unaudited).............        --         --        --             --             --            (1,531)       (1,531)
                                      -----    -------      ----          -----           ----          --------       -------
BALANCE, MARCH 31, 1996
  (UNAUDITED)....................   $    --    $47,400      $648         $   --           $(18)        $ (37,840)      $10,190
                                      =====    =======      ====          =====           ====          ========       =======
</TABLE>
 
                            See accompanying notes.
 
                                       F-5
<PAGE>   60
 
                                 ANERGEN, INC.
 
                            STATEMENTS OF CASH FLOWS
 
                  INCREASE (DECREASE) IN CASH AND EQUIVALENTS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                   THREE MONTHS
                                                         YEARS ENDED                   ENDED
                                                         DECEMBER 31,                MARCH 31,
                                                ------------------------------   -----------------
                                                  1993       1994       1995      1995      1996
                                                --------   --------   --------   -------   -------
                                                                                    (UNAUDITED)
<S>                                             <C>        <C>        <C>        <C>       <C>
Cash used in operating activities:
  Net loss....................................  $ (6,844)  $ (6,960)  $ (7,086)  $(1,863)  $(1,531)
  Adjustments to reconcile net loss to net
     cash used in operating activities:
     Depreciation and amortization............       711        781      1,031       191       267
     Deferred compensation amortization.......       133        132         36        33        --
     Loss on sale of equipment................        --          4         --        --        --
  Changes in operating assets and liabilities:
     Contract receivables-related party.......      (339)      (253)      (223)       41        32
     Prepaid expenses.........................       (57)       (50)        76       (50)       (1)
     Other assets.............................        (1)        --        (16)      (16)       --
     Accounts payable and accrued
       liabilities............................      (213)        10         63        31      (151)
                                                --------   --------   --------   -------   -------
          Net cash used in operating
            activities........................    (6,610)    (6,336)    (6,119)   (1,633)   (1,384)
Cash provided by (used in) investing
  activities:
  Purchase of investments
     available-for-sale.......................   (19,214)   (10,784)   (30,172)   (1,016)   (1,554)
  Sales and maturities of investments
     available-for-sale.......................    17,695     16,654     21,763     2,683     3,201
  Proceeds from sale of equipment.............        --         41         --        --        --
  Purchase of equipment.......................      (686)    (1,386)      (790)      (68)     (143)
                                                --------   --------   --------   -------   -------
          Net cash provided by (used in)
            investing activities..............    (2,205)     4,525     (9,199)    1,599     1,504
Cash provided by financing activities:
  Repayments of capital lease obligations and
     debt.....................................      (604)      (688)    (1,038)     (231)     (319)
  Proceeds from facility and equipment debt
     financing................................       462      1,093        789        --        --
  Issuance of common stock, net...............     8,175      1,468     14,787        36        41
                                                --------   --------   --------   -------   -------
          Net cash provided by financing
            activities........................     8,033      1,873     14,538      (195)     (278)
                                                --------   --------   --------   -------   -------
Net increase (decrease) in cash and
  equivalents.................................      (782)        62       (780)     (229)     (158)
Cash and equivalents at beginning of period...     1,968      1,186      1,248     1,248       468
                                                --------   --------   --------   -------   -------
Cash and equivalents at end of period.........     1,186      1,248        468     1,019       310
Short-term investments at end of period.......     8,399      2,508     11,024       897     9,343
                                                --------   --------   --------   -------   -------
Cash and short-term investments at end of
  period......................................  $  9,585   $  3,756   $ 11,492   $ 1,916   $ 9,653
                                                ========   ========   ========   =======   =======
</TABLE>
 
                            See accompanying notes.
 
                                       F-6
<PAGE>   61
 
                                 ANERGEN, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
 
            (INFORMATION AT MARCH 31, 1996 AND FOR THE THREE MONTHS
                  ENDED MARCH 31, 1995 AND 1996 IS UNAUDITED)
 
 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Nature of business
 
     Anergen, Inc. (the "Company") was incorporated on April 26, 1988 for the
purpose of developing therapies using biopharmaceutical compounds for the
treatment of autoimmune diseases. The Company devotes its efforts to research
and development on its own behalf and also, since September 1993, on behalf of
its corporate partner, Novo Nordisk A/S.
 
     In the course of its activities, the Company has sustained continuing
operating losses and expects such losses to continue. The Company plans to
finance future operations with a combination of stock sales, payments from
collaborative partnerships and licensing of certain technology and, in the
longer term, revenues from product sales, if any. The Company anticipates that
its current cash, short-term investments and expected revenues under its
collaborative agreement with Novo Nordisk A/S will be sufficient to fund its
operations through the first half of 1997. If financing arrangements
contemplated by management are not consummated, the Company may have to seek
other sources of capital or reevaluate operating plans.
 
  Interim financial information (unaudited)
 
     The financial statements at March 31, 1996 and for the three months ended
March 31, 1995 and 1996 are unaudited, but include all adjustments (consisting
of normal recurring adjustments) which the Company considers necessary for a
fair statement of its financial position at such dates and its operating results
and cash flows for those periods. Results for interim periods are not
necessarily indicative of results for the entire year.
 
  Use of estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ from those estimates.
 
  Cash and equivalents
 
     Cash and equivalents are carried at cost which approximates fair value
(based on quoted market prices) and include primarily interest bearing demand
deposits and U.S. Government notes with original maturities of three months or
less.
 
  Securities available-for-sale
 
     The Company accounts for its short-term investments in accordance with
Statement of Financial Accounting Standards No. 115, "Accounting for Certain
Investments in Debt and Equity Securities"("Statement 115"). Under Statement 115
management determines the appropriate classification of debt securities at the
time of purchase and reevaluates such designation as of each balance sheet date.
Debt securities are classified as held-to-maturity when the Company has the
positive intent and ability to hold the securities to maturity. Marketable
securities and debt securities not classified as held-to-maturity are classified
as available-for-sale. To date, all marketable securities have been classified
as available-for-sale. Available-for-sale securities are carried at fair value,
with unrealized gains and losses, net of tax, reported in a separate component
of shareholders' equity. The amortized cost of debt securities in this category
is adjusted for amortization of premiums and accretion of discounts to maturity.
Such amortization is included in interest income. The cost of securities sold is
based on the specific identification method. Interest and dividends on
securities classified as available-for-sale are included in interest income.
 
                                       F-7
<PAGE>   62
 
                                 ANERGEN, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
            (INFORMATION AT MARCH 31, 1996 AND FOR THE THREE MONTHS
                  ENDED MARCH 31, 1995 AND 1996 IS UNAUDITED)
 
  Property and equipment
 
     Property and equipment is stated at cost, less accumulated depreciation and
amortization. Depreciation of property and equipment is provided over the
estimated useful lives (3 to 4 years) of the respective assets using the
straight-line method. Leasehold improvements are amortized over the shorter of
the life of the lease or their estimated useful lives using the straight-line
method.
 
  Contract revenues
 
     Contract revenues consist of revenues from the Company's corporate partner,
Novo Nordisk A/S. Contract revenues derived from the corporate partner agreement
are recorded as earned based on the level of research effort performed by the
Company. The Company is also entitled to receive (i) development milestone
payments upon the occurrence of certain events and (ii) royalties on product
sales, if any.
 
  Research and development
 
     Research and development costs are expensed as incurred and include
personnel costs, materials consumed in research and development activities,
depreciation on equipment used and the cost of facilities used for research and
development.
 
  Stock compensation
 
     The Company continues to account for its stock compensation under APB 25,
the intrinsic value method. The Company has not elected adoption of FAS 123
(effective in fiscal year 1996), however it plans to disclose the pro forma
effects of recognizing the fair market value of options granted as compensation
expense beginning in 1996.
 
  Income taxes
 
     The Company accounts for income taxes using the liability method as
prescribed by Financial Accounting Standards Board Statement No. 109,
"Accounting for Income Taxes." Research and development tax credits will be
accounted for under the "flow through" method when utilized.
 
  Net loss per share
 
     Net loss per share is computed using the weighted average number of shares
of common stock outstanding. Common equivalent shares from stock options and
warrants are excluded from the computation as their effect is anti-dilutive.
 
 2. COLLABORATION WITH NOVO NORDISK A/S - RELATED PARTIES
 
     In August 1993, the Company entered into a development and license
agreement ("Agreement") with Novo Nordisk A/S for the purpose of developing and
commercializing the Company's AnergiX(TM) products for multiple sclerosis
("MS"), myasthenia gravis ("MG"), and insulin dependent diabetes mellitis. Under
the Agreement the Company is entitled to receive (i) research and development
cost reimbursement (ii) development milestone payments and (iii) royalties on
product sales, if any. For the years ended December 31, 1993, 1994 and 1995, the
Company recorded contract revenues $339,000, $2,325,000 and $3,001,000,
respectively, and $783,000 in the three months ended March 31, 1996, under this
agreement. The Company has granted to Novo Nordisk A/S exclusive worldwide
rights to products developed under the Agreement, including rights to
commercialize these products. The Company has retained rights of co-
 
                                       F-8
<PAGE>   63
 
                                 ANERGEN, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
            (INFORMATION AT MARCH 31, 1996 AND FOR THE THREE MONTHS
                  ENDED MARCH 31, 1995 AND 1996 IS UNAUDITED)
 
promotion in North America for therapeutics in MS and MG. In addition, in August
of 1993, Novo Nordisk A/S purchased 1,219,745 shares of common stock for $8
million, and an officer of Novo Nordisk A/S became a member of the Company's
Board of Directors.
 
 3. PROPERTY AND EQUIPMENT
 
     Property and equipment consists of the following at December 31, 1994 and
1995 (in thousands):
 
<TABLE>
<CAPTION>
                                                                        1994        1995
                                                                       -------     -------
    <S>                                                                <C>         <C>
    Research and office leasehold improvements.......................  $   608     $   998
    Research and office equipment....................................    2,458       2,843
    Pilot manufacturing facility leasehold improvements..............      600         600
    Pilot manufacturing facility equipment...........................      972         987
                                                                       -------     -------
                                                                         4,638       5,428
    Less accumulated depreciation and amortization...................   (2,387)     (3,418)
                                                                       -------     -------
                                                                       $ 2,251     $ 2,010
                                                                       =======     =======
</TABLE>
 
 4. INVESTMENTS
 
     The following is a summary of short-term investments (available-for-sale
securities) (in thousands):
 
<TABLE>
<CAPTION>
                                                          AVAILABLE-FOR-SALE SECURITIES
                                               ---------------------------------------------------
                                                             GROSS          GROSS        ESTIMATED
                                                           UNREALIZED     UNREALIZED       FAIR
                                                COST         GAINS          LOSSES         VALUE
                                               -------     ----------     ----------     ---------
    <S>                                        <C>         <C>            <C>            <C>
    December 31, 1994
    U.S. corporate securities................  $   530        $ --           $(19)        $   511
    U.S. government obligations..............    2,069          --            (72)          1,997
                                               -------         ---           ----         -------
              Total debt securities..........  $ 2,599        $ --           $(91)        $ 2,508
                                               =======         ===           ====         =======
    December 31, 1995
    U.S. corporate securities................  $ 7,671        $ 11           $                 --
    U.S. government obligations..............    3,337           5             --           3,342
                                               -------         ---           ----         -------
              Total debt securities..........  $11,008        $ 16           $ --         $11,024
                                               =======         ===           ====         =======
</TABLE>
 
     The net adjustment to unrealized holding gains(losses) on
available-for-sale securities included as a separate component of shareholders'
equity was ($21,000) and $107,000 in 1994 and 1995, respectively.
 
                                       F-9
<PAGE>   64
 
                                 ANERGEN, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
            (INFORMATION AT MARCH 31, 1996 AND FOR THE THREE MONTHS
                  ENDED MARCH 31, 1995 AND 1996 IS UNAUDITED)
 
     The amortized cost and estimated fair value of debt and marketable equity
securities at December 31, 1994 and 1995, by contractual maturity, are shown
below (in thousands). Expected maturities will differ from contractual
maturities because the issuers of the securities may have the right to prepay
obligations without prepayment penalties.
 
<TABLE>
<CAPTION>
                                                                          ESTIMATED
                                                               BOOK         FAIR
                                                               VALUE        VALUE
                                                              -------     ---------
            <S>                                               <C>         <C>
            December 31, 1994
            Available-for-Sale
              Due in one year or less.......................  $ 2,599      $ 2,508
              Due after one year through three years........       --           --
              Due after three years.........................       --           --
                                                              -------      -------
                                                              $ 2,599      $ 2,508
                                                              =======      =======
            December 31, 1995
            Available-for-Sale
              Due in one year or less.......................  $ 5,825      $ 5,828
              Due after one year through three years........    5,183        5,196
              Due after three years.........................       --           --
                                                              -------      -------
                                                              $11,008      $11,024
                                                              =======      =======
</TABLE>
 
 5. LEASE AND DEBT OBLIGATIONS
 
     The Company leases its facilities under noncancelable operating leases.
Facilities rent expense for 1993, 1994, and 1995 was $292,000, $321,000, and
$551,000, respectively.
 
     Property and equipment at December 31, 1995 includes $263,000 of equipment
under capital lease obligations, less accumulated amortization of $244,000. The
leases provide that the Company pay taxes, insurance and maintenance expense
related to the leased assets.
 
     On December 29, 1992, the Company entered into a loan agreement which
provided $1,400,000 in financing related to the Company's pilot manufacturing
facility. As of April 12, 1993, the Company had borrowed the full amount
available under this agreement. Slightly under half of this debt is unsecured
while the remainder is secured by equipment in the Company's pilot manufacturing
facility. This loan is repayable over a 36 month period with the final payment
to be based on the fair market value of the leasehold improvements and equipment
(but not less than 10% or more than 20% of the original cost). Warrants to
purchase 16,919 shares of the Company's common stock at an exercise price of
$9.93 per share were issued to the lender under this loan agreement. No value
was assigned to these warrants due to immateriality. At December 31, 1995 the
Company had net borrowings of $146,000 under the loan.
 
     On December 30, 1993, the Company amended the above agreement to provide
for an additional $500,000 in financing related to equipment purchases. At March
31, 1994, the Company had borrowed the full amount available under this
agreement, all of which is secured by equipment purchased by the Company. At
December 31, 1995, the Company had net borrowings of $257,000 under the loan.
This loan is repayable over a 36 month period with the final payment to be based
on the fair market value of the equipment (but not less than 10% or more than
20% of the original cost). Warrants to purchase 8,577 shares of the Company's
common stock at an exercise price of $5.83 per share were issued to the lender
under this amendment to the loan agreement. No value was assigned to these
warrants due to immateriality.
 
                                      F-10
<PAGE>   65
 
                                 ANERGEN, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
            (INFORMATION AT MARCH 31, 1996 AND FOR THE THREE MONTHS
                  ENDED MARCH 31, 1995 AND 1996 IS UNAUDITED)
 
     On April 18, 1994 the Company entered into a loan agreement with Silicon
Valley Bank of California which provided $1,200,000. As of December 31, 1994
$957,000 had been drawn down upon under this agreement, all of which is secured
by equipment purchased by the Company. At December 31, 1995, the Company had net
borrowings of $561,000 under the loan.
 
     On June 23, 1995 the Company entered into a second loan agreement with
Silicon Valley Bank of California which provided $800,000 in financing available
through December 31, 1995. As of December 31, 1995 the Company had borrowed the
full amount available under this agreement, ($712,000 balance outstanding at
December 31, 1995), all of which is secured by equipment purchased by the
Company. Under agreements with Silicon Valley Bank there are restrictions
imposed upon the Company's ability to declare cash dividends.
 
     Future minimum payments, by year and in the aggregate, under the debt and
capital leases and noncancelable operating leases consisted of the following at
December 31, 1995 (in thousands):
 
<TABLE>
<CAPTION>
                                                         DEBT AND CAPITAL     OPERATING
                                                              LEASES           LEASES
                                                         ----------------     ---------
            <S>                                          <C>                  <C>
            1996.......................................       $1,020           $   578
            1997.......................................          688               541
            1998.......................................          190               505
            1999.......................................           --                39
                                                              ------            ------
            Total minimum debt and lease payments......        1,898           $ 1,663
                                                                                ======
            Less amount representing interest..........          197
                                                              ------
            Present value of future minimum debt and
              lease payments...........................        1,701
            Less current portion of debt and lease
              obligations..............................          883
                                                              ------
            Long-term debt and lease obligations.......       $  818
                                                              ======
</TABLE>
 
 6. SHAREHOLDERS' EQUITY
 
  1988 Stock Option Plan
 
     The Company has granted certain officers, employees and consultants options
to purchase shares of the Company's common stock at prices ranging from $0.16 to
$11.00 per share under its 1988 Stock Option Plan ("option plan"). The Company
has reserved 1,800,000 shares of common stock for issuance under the option
plan. These options vest over periods of up to four years and, once vested, can
be exercised at any time for a period of 5 years from the date of grant. The
Company recorded deferred compensation of $529,000 in 1991 related to the
issuance of certain stock options. This compensation was charged to operations
ratably over the
 
                                      F-11
<PAGE>   66
 
                                 ANERGEN, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
            (INFORMATION AT MARCH 31, 1996 AND FOR THE THREE MONTHS
                  ENDED MARCH 31, 1995 AND 1996 IS UNAUDITED)
 
vesting period of the options. As of December 31, 1995, all of this amount had
been amortized and charged to operations. The activity under the option plan is
as follows:
 
<TABLE>
<CAPTION>
                                                          NUMBER OF      PRICE PER
                                                           SHARES          SHARE
                                                          ---------     -----------
            <S>                                           <C>           <C>
            Balance at December 31, 1992................    645,000     $0.16-11.00
            Granted.....................................    257,000      5.50- 9.50
            Exercised...................................    (56,000)     0.16- 2.00
            Forfeited...................................    (11,000)     0.21-11.00
                                                                        -----------
                                                           --------
            Balance at December 31, 1993................    835,000     $0.16-11.00
            Granted.....................................    109,000      2.62- 5.75
            Exercised...................................    (45,000)     0.16- 0.27
            Forfeited...................................    (94,000)     0.21-10.75
                                                                        -----------
                                                           --------
            Balance at December 31, 1994................    805,000     $0.21-11.00
            Granted.....................................    283,000      2.00- 3.25
            Exercised...................................   (168,000)     0.21- 2.62
            Forfeited...................................    (41,000)     2.62-11.00
                                                                        -----------
                                                           --------
            Balance at December 31, 1995................    879,000     $0.21-11.00
            Granted (unaudited).........................     11,000      4.00
            Exercised (unaudited).......................    (61,000)     0.21- 2.75
            Forfeited (unaudited).......................     (3,000)     2.62-10.75
                                                                        -----------
                                                           --------
            Balance at March 31, 1996 (unaudited).......    826,000     $0.21-11.00
                                                           ========     ===========
            Vested at December 31, 1995.................    430,000     $0.21-11.00
                                                           ========     ===========
            Vested at March 31, 1996 (unaudited)........    417,000     $2.00-11.00
                                                           ========     ===========
</TABLE>
 
     The Company's Board of Directors has approved a plan whereby the Company's
officers, employees and consultants had the option during the month of February
1995 to elect to extend the option exercise period by four years. Elections to
extend 555,113 options were made. All vested shares under grants subsequent to
February 1995 can be exercised at any time for a period of nine years from the
date of grant.
 
  Warrants
 
     In connection with the October 10, 1991 initial public offering, the
Company's underwriters were granted a warrant exercisable for five years to
purchase up to 196,656 shares of the Company's common stock for $5.98 per share;
it remains unexercised as of December 31, 1995.
 
     In June, 1994 the Company issued warrants to purchase 236,863 shares of
Common Stock at an exercise price of $3.52 per share through a private placement
to two purchasers; it remains unexercised as of December 31, 1995.
 
  Employee Stock Purchase Plan
 
     The Company has an Employee Stock Purchase Plan under which a total of
150,000 shares of common stock have been reserved and made available for
purchase by eligible employees.
 
     Eligible employees may have up to 10% of their wages withheld for purchases
of common stock of the Company. On September 30 and March 31 of each year, the
funds then in each employee's account are applied to the purchase of shares of
common stock at 85% of the fair market value at such date or at six month
retroactive intervals up to 24 months, whichever is less. As of December 31,
1995, 97,205 shares had been purchased with such funds.
 
                                      F-12
<PAGE>   67
 
                                 ANERGEN, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
            (INFORMATION AT MARCH 31, 1996 AND FOR THE THREE MONTHS
                  ENDED MARCH 31, 1995 AND 1996 IS UNAUDITED)
 
 7. ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
 
     Accounts payable and accrued liabilities include the following (in
thousands):
 
<TABLE>
<CAPTION>
                                                                  1994      1995
                                                                  ----     ------
            <S>                                                   <C>      <C>
            Accounts payable....................................  $537     $  559
            Accrued collaborative expenses......................    87         87
            Outside production support..........................    21         20
            Accrued vacation pay................................   103        114
            Accrued professional fees...........................   142        157
            Other...............................................    87        103
                                                                  ----     ------
                      Total accounts payable and accrued
                        liabilities.............................  $977     $1,040
                                                                  ====     ======
</TABLE>
 
 8. INCOME TAXES
 
     At December 31, 1995, the Company had federal and state net operating loss
carryforwards of approximately $33.7 million and $16.6 million, respectively,
which expire in varying amounts through 2010. Additionally, the Company has
research and development tax credit carryforwards for federal tax purposes of
approximately $1.3 million.
 
     The Company's stock offering in April 1995 resulted in a change in
ownership and it is expected that the entire net operating loss and credit
carryforwards as of April 1995 may be subject to an annual limitation based on
the Company's pre-change value. The annual limitation will result in the
expiration of the net operating losses and credits before utilization.
 
     Net operating losses incurred subsequent to April 1995 may also be subject
to an annual limitation such that the net operating losses may expire before
utilization.
 
     Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. Significant components of
the Company's deferred tax liabilities and assets as of December 31, 1994 and
1995 are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER
                                                                      31,
                                                             ---------------------
                                                               1994         1995
                                                             --------     --------
            <S>                                              <C>          <C>
            Deferred income tax assets:
              Net operating loss carryforwards.............  $  9,502     $ 12,500
              Research credits.............................     1,666        1,700
              Other deferred tax assets....................        87          200
                                                             ----------   ----------
                                                                   --           --
            Net deferred tax assets........................    11,255       14,400
            Valuation allowance for deferred tax assets....   (11,255)     (14,400)
                                                             ----------   ----------
                                                                   --           --
            Total deferred tax assets......................  $     --     $     --
                                                             ============ ============
</TABLE>
 
     The net valuation allowance increased by $2,508,000 during the year ended
December 31, 1994 ($5,953,000 in 1993).
 
                                      F-13
<PAGE>   68
 
- ------------------------------------------------------
- ------------------------------------------------------
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS IN CONNECTION WITH THIS OFFERING OTHER THAN THOSE CONTAINED IN
THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH OTHER INFORMATION AND
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY
OR THE UNDERWRITERS. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE
HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS
BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE
INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN
OFFER TO BUY ANY SECURITIES OTHER THAN THE REGISTERED SECURITIES TO WHICH IT
RELATES. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION
OF AN OFFER TO BUY SUCH SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR
SOLICITATION IS UNLAWFUL.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Summary...............................     3
Risk Factors..........................     6
Use of Proceeds.......................    16
Dividend Policy.......................    16
Capitalization........................    17
Price Range of Common Stock...........    17
Dilution..............................    18
Selected Financial Data...............    19
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................    20
Business..............................    23
Management............................    37
Certain Transactions..................    44
Principal Stockholders................    45
Description of Capital Stock..........    47
Shares Eligible for Future Sale.......    49
Underwriting..........................    51
Legal Matters.........................    52
Experts...............................    52
Additional Information................    52
Index to Financial Statements.........   F-1
</TABLE>
 
- ------------------------------------------------------
- ------------------------------------------------------
 
- ------------------------------------------------------
- ------------------------------------------------------
 
                                4,000,000 SHARES
 
                                 ANERGEN, INC.
                                  COMMON STOCK
 
                            ------------------------
                              P R O S P E C T U S
                            ------------------------
                            PAINEWEBBER INCORPORATED
                     VECTOR SECURITIES INTERNATIONAL, INC.
                            ------------------------
 
                                           , 1996
- ------------------------------------------------------
- ------------------------------------------------------
<PAGE>   69
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the costs and expenses, other than
underwriting discounts and commissions, payable by the Registrant in connection
with the sale of Common Stock being registered. All amounts are estimates except
the SEC registration fee and the NASD filing fee.
 
<TABLE>
        <S>                                                                 <C>
        SEC registration fee..............................................  $  7,436
        NASD filing fee...................................................     2,656
        Nasdaq National Market listing fee................................    17,500
        Printing and engraving costs......................................   150,000
        Legal fees and expenses...........................................   100,000
        Accounting fees and expenses......................................    50,000
        Blue Sky fees and expenses........................................    20,000
        Transfer Agent and Registrar fees.................................     5,000
        Miscellaneous expenses............................................    47,408
                                                                            --------
                  Total...................................................  $400,000
                                                                            ========
</TABLE>
 
ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     The Company's Articles of Incorporation and Bylaws provide for
indemnification of the officers and directors of the Company to the full extent
permitted by law. The General Corporation Law of the State of California permits
a corporation to limit, under certain circumstances, a director's liability for
monetary damages in actions brought by or in the right of the corporation. The
Company's Articles of Incorporation also provide for the elimination of the
liability of directors for monetary damages to the full extent permitted by law.
 
     The Company has entered into agreements to indemnify its directors and
officers in addition to the indemnification provided for in the Articles of
Incorporation and Bylaws. These agreements will, among other things, indemnify
the Company's directors and officers for certain expenses (including attorneys'
fees), judgments, fines and settlement amounts incurred in any action or
proceeding, including any action by or in the right of the Company, on account
of services as a director or officer of any other enterprise to which the person
provides services at the request of the Company. The Company believes that these
provisions and agreements are necessary to attract and retain qualified persons
as directors and officers. The Company currently maintains a directors' and
officers' insurance policy. At present, there is no pending litigation or
proceeding involving a director, officer or employee of the Company as to which
indemnification is sought, nor is the Company aware of any threatened litigation
or proceeding that may result in claims for indemnification.
 
                                      II-1
<PAGE>   70
 
ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES
 
     Since October 10, 1991, the Registrant has issued and sold (without payment
of any selling commission to any person) the following unregistered securities:
 
          (1) In August 1993, the Registrant issued and sold an aggregate of
     1,219,745 shares of Common Stock to Novo Nordisk A/S for an aggregate
     purchase price of $8 million. See "Certain Transactions."
 
          (2) In June 1994, the Registrant issued and sold to an unaffiliated
     investor an aggregate of 413,965 shares of Common Stock and 236,863
     warrants to purchase Common Stock for an aggregate purchase price of $1.5
     million.
 
     The sales and issuances of securities in the transactions described above
were deemed to be exempt from registration under the Securities Act by virtue of
Section 4(2) and/or Rule 506 promulgated under the Securities Act. The
purchasers in each case represented their intention to acquire the securities
for investment only and not with a view to the distribution thereof. Appropriate
legends are affixed to the stock certificates issued in such transactions.
 
ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
     (a) EXHIBITS
 
<TABLE>
<CAPTION>
 EXHIBIT                                       DESCRIPTION
- ---------    --------------------------------------------------------------------------------
<S>          <C>
*1.1         Form of Underwriting Agreement
 3.1         Restated and Amended Articles of Incorporation(1)
 3.2         Bylaws, as amended(1)
 4.1         Form of Common Stock Certificate(1)
*5.1         Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation
10.1         Form of Indemnification Agreement for directors and officers(1)
10.2         1988 Stock Option Plan (as amended) and form of agreements thereunder(1)
10.3         1991 Employee Stock Purchase Plan, as amended(1)
10.4         1992 Consultant Stock Plan(2)
10.5         Representative Preferred Stock Purchase Agreement(1)
10.5A        Sublease dated December 15, 1989 between Registrant and Invitron Corporation,
             with amendment dated February 28, 1990(1)
10.5B        Landlord's Consent to Sublease dated March 2, 1990 among the Registrant,
             Invitron Corporation and Seaport Centre Venture Phase II(1)
10.5C        Ten-Year Industrial Net Lease Agreement dated June 5, 1987 between Invitron
             Corporation and Seaport Centre Venture Phase II, with amendments dated November
             9, 1987; October 31, 1988; August 1989; and February 28, 1990(1)
10.5D        Amendments to Seaport Center Standard Lease between the Registrant and
             Metropolitan Life Insurance Company dated January 10, 1995; and March 24,
             1995(7)
10.5E        Industrial Lease Agreement Group, with amendments dated March 31, 1993; and June
             17, 1994(10)
10.6A        Master Lease Agreement dated July 8, 1988 between the Registrant and Comdisco,
             Inc. With Equipment Schedule No. VL-1 dated July 8, 1988 and Equipment Schedule
             No. VL-2 dated April 4, 1990(1)
10.7         Form of Representative's Warrant Agreement(1)
10.8A        Loan and Security agreement dated December 29, 1992 between the Registrant and
             MMC/GATX Partnership No. I(3)
10.8B        Secured Promissory Note dated December 29, 1992 issued by the Registrant to
             MMC/GATX Partnership No. I(3)
</TABLE>
 
                                      II-2
<PAGE>   71
 
<TABLE>
<CAPTION>
 EXHIBIT                                       DESCRIPTION
- ---------    --------------------------------------------------------------------------------
<S>          <C>
10.8C        Warrant dated December 29, 1992 issued by the Registrant to MMC/GATX Partnership
             No. I(3)
10.8D        Amendment to the Loan and Security agreement dated December 30, 1993 between the
             Registrant and MMC/GATX Partnership No. I(4)
10.8E        Warrant dated December 30, 1993 issued by the Registrant to MMC/GATX Partnership
             No. I(4)
10.9A        Development and License agreement dated August 17, 1993 between the Registrant
             and Novo Nordisk A/S(5)
10.9B        Common Stock Purchase Agreement dated August 17, 1993 between the Registrant and
             Novo Nordisk A/S(5)
10.9C        Amendment No. 1 dated March 26, 1996 to the Development and License Agreement
             between the Registrant and Novo Nordisk A/S(11)
10.9D        Addendum dated March 26, 1996 to the Development and License Agreement between
             the Registrant and Novo Nordisk A/S(11)
10.10A       Loan and Security agreement dated April 18, 1994 between the Registrant and
             Silicon Valley Bank(6)
10.10B       Loan and Security agreement dated June 23, 1995 between the Registrant and
             Silicon Valley Bank(9)
10.10C       Loan Modification Agreement dated August 31, 1994 between the registrant and
             Silicon Valley Bank(10)
10.11A       Securities Purchase Agreement dated May 11, 1994 between the Registrant and
             certain purchasers(6)
10.11B       Warrant dated June 30, 1994 issued to Ortelius Trading L.P.(8)
10.11B-1     Letter related to Warrant issued to Ortelius Trading L.P.(9)
10.11C       Warrant dated June 30, 1994 issued to GDK, Inc.(8)
10.11C-1     Letter related to Warrant issued to GDK, Inc.(9)
10.11D       Amendment to Securities Purchase Agreement dated June 30, 1994 between the
             Registrant and certain purchasers(8)
10.11E       Amendment to Securities Purchase Agreement dated February 15, 1995 between the
             Registrant and certain purchasers(7)
10.12A       Common Stock Purchase agreement dated March 10, 195 between the Registrant and
             Warburg, Pincus Ventures, L.P. and International Biotechnology Trust PLC(7)
10.12B       Amendment to Common Stock Purchase Agreement dated March 15, 1995(7)
10.13        1995 Director Option Plan(10)
10.14        Transition Agreement and Mutual Release between the Company and John W. Fara,
             Ph.D.(11)
</TABLE>
 
                                      II-3
<PAGE>   72
 
<TABLE>
<CAPTION>
 EXHIBIT                                       DESCRIPTION
- ---------    --------------------------------------------------------------------------------
<S>          <C>
*10.15(12)   Product Development and License Agreement dated June 28, 1996 between the
             Registrant and N.V. Organon
*10.16       Employment Agreement of Barry M. Sherman, M.D.
*23.1        Consent of Ernst & Young LLP, independent auditors
*23.2        Consent of Townsend and Townsend and Crew LLP
*23.3        Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (contained
             in Exhibit 5.1 hereto)
*27.1        Financial Data Schedule
</TABLE>
 
- ---------------
  *  Filed herewith
 
 (1) Incorporated by reference to the exhibit filed with Registrant's
     Registration Statement on Form S-1 (No. 33-42107), as amended.
 
 (2) Incorporated by reference to exhibit filed with the Company's Form S-8 (No.
     33-52186).
 
 (3) Incorporated by reference to the exhibit filed with the Company's Annual
     Report on Form 10K for the year ended December 31, 1992.
 
 (4) Incorporated by reference to the exhibit filed with the Company's quarterly
     Report on Form 10Q for the quarter ended September 30, 1993.
 
 (5) Incorporated by reference to the exhibit filed with the Company's Annual
     Report on Form 10K for the year ended December 31, 1992.
 
 (6) Incorporated by reference to the exhibit filed with the Company's Quarterly
     Report on Form 10Q for the quarter ended March 31, 1994.
 
 (7) Incorporated by reference to the exhibit filed with the Company's Annual
     Report on Form 10K for the year ended December 31, 1994.
 
 (8) Incorporated by reference to the exhibit filed with Registrant's
     Registration Statement on Form S-1 (No. 33-84310), as amended.
 
 (9) Incorporated by reference to the exhibit filed with the Company's Quarterly
     Report on Form 10Q for the quarter ended June 30, 1995.
 
(10) Incorporated by reference to the exhibit filed with the Company's Annual
     Report on Form 10K for the year ended December 31, 1995.
 
(11) Incorporated by reference to the exhibit filed with the Company's Annual
     Report on Form 10K/A for the year ended December 31, 1995.
 
(12) Confidential treatment sought for portions of this exhibit.
 
     (b) FINANCIAL STATEMENT SCHEDULES
 
     Schedules have been omitted because the information required to be set
forth therein is not applicable or is shown in the financial statements or notes
thereto.
 
ITEM 17.  UNDERTAKINGS
 
     Insofar as indemnification by the Registrant for liabilities arising under
the Securities Act may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the provisions referenced in Item 14 of
this Registration Statement or otherwise, the Registrant has been advised that
in the opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Securities Act, and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the Registrant of expenses incurred or
paid by a director, officer, or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered hereunder, the Registrant will, unless in the opinion of its counsel
the matter has been settled by controlling precedent,
 
                                      II-4
<PAGE>   73
 
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.
 
     The undersigned registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of Prospectus filed as part of
     this Registration Statement in reliance upon Rule 430A and contained in a
     form of Prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of Prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
                                      II-5
<PAGE>   74
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act, the Registrant has duly
caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in Redwood City in the State of
California on the 27th day of June, 1996.
 
                                          By:   /S/  BARRY M. SHERMAN, M.D.
                                            ------------------------------------
                                            Barry M. Sherman, M.D.
                                            President and Chief Executive
                                              Officer
 
                               POWER OF ATTORNEY
 
     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Barry M. Sherman, M.D. and John W. Varian
and each of them, his attorneys-in-fact, each with the power of substitution,
for him and in his name, place and stead, in any and all capacities, to sign any
and all amendments (including post-effective amendments) to this Registration
Statement, and to sign any registration statement for the same offering covered
by this Registration Statement that is to be effective upon filing pursuant to
Rule 462(b) promulgated under the Securities Act of 1933, and all post-effective
amendments thereto, and to file the same, with all exhibits thereto in all
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as he might or could do in person, hereby ratifying and confirming all
that such attorneys-in-fact and agents or any of them, or his or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed on the 27th day of June, 1996 by the
following persons in the capacities indicated:
 
<TABLE>
<CAPTION>
                  SIGNATURE                                         TITLE
- ---------------------------------------------   ----------------------------------------------
<S>                                             <C>
/S/  BARRY M. SHERMAN, M.D.                     President, Chief Executive Officer and
- ---------------------------------------------   Director (Principal Executive Officer)
       Barry M. Sherman, M.D.

/S/  JOHN W. VARIAN                             Vice President and Chief Financial Officer
- ---------------------------------------------   (Principal Financial and Accounting Officer)
       John W. Varian

/S/  BRUCE L.A. CARTER, PH.D.                   Director
- ---------------------------------------------
       Bruce L. A. Carter, Ph.D.

/S/  NICHOLAS LOWCOCK                           Director
- ---------------------------------------------
       Nicholas Lowcock

/S/  HARDEN MCCONNELL, PH.D.                    Director
- ---------------------------------------------
       Harden McConnell, Ph.D.

/S/  HARRY H. PENNER, JR.                       Director
- ---------------------------------------------
      Harry H. Penner, Jr.

/S/  JAMES E. THOMAS                            Director
- ---------------------------------------------
      James E. Thomas

/S/  NICOLE VITULLO                             Director
- ---------------------------------------------
      Nicole Vitullo
</TABLE>
 
                                      II-6

<PAGE>   1

                                                                     EXHIBIT 1.1

                                                                       S&S Draft
                                                                         6/24/96

                                4,000,000 Shares
                                  ANERGEN, INC.

                                  Common Stock

                             UNDERWRITING AGREEMENT

                                                                         -, 1996

PAINEWEBBER INCORPORATED
VECTOR SECURITIES INTERNATIONAL, INC.
  As Representatives of the
  several Underwriters
c/o PaineWebber Incorporated
  1285 Avenue of the Americas
  New York, New York 10019

Dear Sirs:

         Anergen, Inc., a California corporation (the "Company"), proposes to
sell an aggregate of 4,000,000 shares (the "Firm Shares") of the Company's
Common Stock, no par value (the "Common Stock"), to you and to the other
underwriters named in Schedule I (collectively, the "Underwriters"), for whom
you are acting as representatives (the "Representatives"). The Company has also
agreed to grant to you and the other Underwriters an option (the "Option") to
purchase up to an additional 600,000 shares of Common Stock (the "Option
Shares") on the terms and for the purposes set forth in Section 1(b). The Firm
Shares and the Option Shares are hereinafter collectively referred to as the
"Shares."

         The initial public offering price per share for the Shares and the
purchase price per share for the Shares to be paid by the several Underwriters
shall be agreed upon by the Company and the Representatives, acting on behalf of
the several Underwriters, and such agreement shall be set forth in a separate
written instrument substantially in the form of Exhibit A hereto (the "Price
Determination Agreement"). The Price Determination Agreement may take the form
of an exchange of any standard form of written telecommunication among the
Company and the Representatives and shall specify such applicable information as
is indicated in Exhibit A hereto. The offering of the Shares will be governed by
this Agreement, as supplemented by the Price Determination Agreement. From and
after the date of the execution and delivery of the Price Determination
Agreement, this Agreement shall be deemed to incorporate, and, unless the
context otherwise indicates, all




<PAGE>   2
                                        2



references contained herein to "this Agreement" and to the phrase "herein" shall
be deemed to include, the Price Determination Agreement.

         The Company confirms as follows its agreements with the Representatives
and the several other Underwriters.

         1. Agreement to Sell and Purchase.

                  (a) On the basis of the representations, warranties and
agreements of the Company herein contained and subject to all the terms and
conditions of this Agreement, the Company agrees to sell to each Underwriter
named below, and each Underwriter, severally and not jointly, agrees to purchase
from the Company at the purchase price per share for the Firm Shares to be
agreed upon by the Representatives and the Company in accordance with Section
1(c) or 1(d) and set forth in the Price Determination Agreement, the number of
Firm Shares set forth opposite the name of such Underwriter in Schedule I, plus
such additional number of Firm Shares which such Underwriter may become
obligated to purchase pursuant to Section 8 hereof. Schedule I may be attached
to the Price Determination Agreement.

                  (b) Subject to all the terms and conditions of this Agreement,
the Company grants the Option to the several Underwriters to purchase, severally
and not jointly, up to 600,000 Option Shares from the Company at the same price
per share as the Underwriters shall pay for the Firm Shares. The Option may be
exercised only to cover over-allotments in the sale of the Firm Shares by the
Underwriters and may be exercised in whole or in part at any time (but not more
than once) on or before the 30th day after the date of this Agreement (or, if
the Company has elected to rely on Rule 430A (as defined in Section 3(a) 
below), on or before the 30th day after the date of the Price Determination
Agreement), upon written or telegraphic notice (the "Option Shares Notice") by
the Representatives to the Company no later than 12:00 noon, New York City time,
at least two and no more than five business days before the date specified for
closing in the Option Shares Notice (the "Option Closing Date") setting forth
the aggregate number of Option Shares to be purchased and the time and date for
such purchase. On the Option Closing Date, the Company will issue and sell to
the Underwriters the number of Option Shares set forth in the Option Shares
Notice, and each Underwriter will purchase such percentage of the Option Shares
as is equal to the percentage of Firm Shares that such Underwriter is
purchasing, as adjusted by the Representatives in such manner as they deem
advisable to avoid fractional shares.

                  (c) If the Company has elected to rely on Rule 430A, the
initial public offering price per share for the Firm Shares and the purchase
price per share for the Firm Shares to be paid by the several Underwriters shall
be agreed upon and set forth in the Price Determination Agreement. In the event
such price has not been agreed upon and the Price Determination Agreement has
not been executed by the close of business on the




<PAGE>   3
                                        3

fourteenth business day following the date on which the Registration Statement
becomes effective, this Agreement shall terminate forthwith, without liability
of any party to any other party except that Section 6 shall remain in effect.

                  2. Delivery and Payment. Delivery of the Firm Shares shall be
made to the Representatives for the accounts of the Underwriters against payment
of the purchase price by certified or official bank check or by wire transfer to
an account designated by the Company in Federal (same-day) funds. Such payments
shall be made at 10:00 a.m., New York City time, on the fourth business day
after the date on which the first bona fide offering of the Shares to the public
is made by the Underwriters or at such time on such other date, not later than
ten business days after such date, as may be agreed upon by the Company and the
Representatives (such date is hereinafter referred to as the "Closing Date").

                           (a) To the extent the Option is exercised, delivery
of the Option Shares against payment by the Underwriters (in the manner
specified above) will take place at the offices specified above for the Closing
Date at the time and date (which may be the Closing Date) specified in the
Option Shares Notice.

                           (b) The cost of original issue tax stamps, if any, in
connection with the issuance and delivery of the Firm Shares and Option Shares
by the Company to the respective Underwriters shall be borne by the Company. The
Company will pay and save each Underwriter and any subsequent holder of the
Shares harmless from any and all liabilities with respect to or resulting from
any failure or delay in paying Federal and state stamp and other transfer taxes,
if any, which may be payable or determined to be payable in connection with the
original issuance or sale to such Underwriter of the Firm Shares and Option
Shares.

                  3. Representations and Warranties of the Company. The Company
represents, warrants and covenants to each Underwriter that:

                           (a) A registration statement (Registration No. -) on
Form S-1 relating to the Shares, including a preliminary prospectus and such
amendments to such registration statement as may have been required to the date
of this Agreement, has been prepared by the Company under the provisions of the
Securities Act of 1933, as amended (the "Act"), and the rules and regulations
(collectively referred to as the "Rules and Regulations") of the Securities and
Exchange Commission (the "Commission") thereunder, and has been filed with the
Commission. The term "preliminary prospectus" as used herein means a preliminary
prospectus as contemplated by Rule 430 or Rule 430A ("Rule 430A") of the Rules
and Regulations included at any time as part of the registration statement.
Copies of such registration statement and amendments and of each related
preliminary prospectus have been delivered to the Representatives. The term
"Registration Statement" means the




<PAGE>   4


                                        4

registration statement as amended at the time it becomes or became effective
(the "Effective Date"), including financial statements and all exhibits and any
information deemed to be included therein by Rule 430A or Rule 434 of the Rules
and Regulations. If the Company files a registration statement to register a
portion of the Shares and relies on Rule 462(b) of the Rules and Regulations for
such registration statement to become effective upon filing with the Commission
(the "Rule 462 Registration Statement"), then any reference to the "Registration
Statement" shall be deemed to include the Rule 462 Registration Statement, as
amended from time to time. The term "Prospectus" means the prospectus as first
filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations
or, if no such filing is required, the form of final prospectus included in the
Registration Statement at the Effective Date.

                           (b) On the Effective Date, the date the Prospectus is
first filed with the Commission pursuant to Rule 424(b) (if required), at all
times subsequent to and including the Closing Date and, if later, the Option
Closing Date and when any post-effective amendment to the Registration Statement
becomes effective or any amendment or supplement to the Prospectus is filed with
the Commission, the Registration Statement and the Prospectus (as amended or as
supplemented if the Company shall have filed with the Commission any amendment
or supplement thereto), including the financial statements included in the
Prospectus, did or will comply in all material respects with all applicable 
provisions of the Act and the Rules and Regulations and will contain all
statements required to be stated therein in accordance with the Act and the
Rules and Regulations. On the Effective Date and when any post-effective
amendment to the Registration Statement becomes effective, no part of the
Registration Statement or any such amendment did or will contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary in order to make the statements therein not
misleading. At the Effective Date, the date the Prospectus or any amendment or
supplement to the Prospectus is filed with the Commission and at the Closing
Date and, if later, the Option Closing Date, the Prospectus did not or will not
contain any untrue statement of a material fact or omit to state a material fact
necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading. The foregoing representations and
warranties in this Section 3(b) do not apply to any statements or omissions made
in reliance on and in conformity with information relating to any Underwriter
furnished in writing to the Company by the Representatives specifically for
inclusion in the Registration Statement or Prospectus or any amendment or
supplement thereto. For all purposes of this Agreement, the amounts of the
selling concession and reallowance set forth in the Prospectus constitute the
only information relating to any Underwriter furnished in writing to the Company
by the Representatives specifically for inclusion in the Registration Statement,
the preliminary prospectus or the Prospectus. The Company has not distributed
any offering material in connection with the offering or sale of the Shares
other than the Registration Statement, the preliminary prospectus, the
Prospectus or any other materials, if any, permitted by the Act.




<PAGE>   5
                                        5

                           (c) The Company is, and at the Closing Date will be,
a corporation duly organized, validly existing and in good standing under the
laws of its jurisdiction of incorporation. The Company has, and at the Closing
Date will have, full corporate power and authority to own or lease all the
assets owned or leased by it and to conduct its business as described in the
Registration Statement and the Prospectus. The Company is, and at the Closing
Date will be, duly licensed or qualified to do business and in good standing as
a foreign corporation in all jurisdictions in which the nature of the activities
conducted by it or the character of the assets owned or leased by it makes such
licensing or qualification necessary, except as the failure to be so licensed or
qualified will not have a material adverse effect on the Company's business,
properties, business prospects, condition (financial or otherwise) or results of
operations. Except as disclosed in the Registration Statement, the Company does
not own, and at the Closing Date will not own, directly or indirectly, any
shares of stock or any other equity or long-term debt securities of any
corporation or have any equity interest in any firm, partnership, joint venture,
association or other entity. Complete and correct copies of the articles of
incorporation and of the by-laws of the Company and all amendments thereto have
been delivered to the Representatives, and no changes therein will be made
subsequent to the date hereof and prior to the Closing Date or, if later, the
Option Closing Date.

                           (d) The outstanding shares of Common Stock have been,
and the Shares to be issued and sold by the Company upon such issuance will be,
duly authorized, validly issued, fully paid and nonassessable and will not be
subject to any preemptive or similar right. The description of the Common Stock
in the Registration Statement and the Prospectus under the caption "Description
of Capital Stock" is, and at the Closing Date will be, complete and accurate in
all material respects. Except as set forth in the Prospectus, the Company does
not have outstanding, and at the Closing Date will not have outstanding, any
options to purchase, or any rights or warrants to subscribe for, or any
securities or obligations convertible into, or any contracts or commitments to
issue or sell, any shares of Common Stock or any such warrants, convertible
securities or obligations.

                           (e) The financial statements included in the 
Registration Statement or the Prospectus present fairly the financial
condition of the Company as of the respective dates thereof and the results of
operations and cash flows of the Company for the respective periods covered
thereby, all in conformity with generally accepted accounting principles applied
on a consistent basis throughout the entire period involved, except as otherwise
disclosed in the Prospectus. No other financial statements 




<PAGE>   6
                                        6

of the Company are required by the Act or the Rules and Regulations to be
included in the Registration Statement or the Prospectus. Ernst & Young LLP (the
"Accountants") who have reported on such financial statements, are independent
accountants with respect to the Company as required by the Act and the Rules and
Regulations. To the Company's knowledge, the statements included in the
Registration Statement with respect to the Accountants pursuant to Rule 509 of
Regulation S-K of the Rules and Regulations are true and correct in all material
respects.

                           (f) The Company maintains a system of internal
accounting controls sufficient to provide reasonable assurance that (i)
transactions are executed in accordance with management's general or specific
authorization; (ii) transactions are recorded as necessary to permit preparation
of financial statements in conformity with generally accepted accounting
principles and to maintain accountability for assets; (iii) access to assets is
permitted only in accordance with management's general or specific
authorization; and (iv) the recorded accountability for assets is compared with
existing assets at reasonable intervals and appropriate action is taken with
respect to any differences.

                           (g) Subsequent to the respective dates as of which
information is given in the Registration Statement and the Prospectus and prior
to the Closing Date, except as set forth in or contemplated by the Registration
Statement and the Prospectus, (i) there has not been and will not have been any
change in the capitalization of the Company, or in the business, properties,
business prospects, condition (financial or otherwise) or results of operations
of the Company, arising for any reason whatsoever, (ii) the Company has not
incurred nor will it incur any material liabilities or obligations, direct or
indirect, nor has it entered into nor will it enter into any material
transactions other than pursuant to this Agreement and the transactions referred
to herein and (iii) the Company has not and will not have paid or declared any
dividends or other distributions of any kind on any class of its capital stock.

                           (h) The Company is not an "investment company" or an
"affiliated person" of, or "promoter" or "principal underwriter" for, an
"investment company," as such terms are defined in the Investment Company Act of
1940, as amended.

                           (i) Except as set forth in the Registration Statement
and the Prospectus, there are no actions, suits or proceedings pending or, to
the Company's knowledge, threatened against or affecting the Company or any of
its officers in their capacity as such, before or by any Federal or state court,
commission, regulatory body, administrative agency or other governmental body,
domestic or foreign, wherein an unfavorable ruling, decision or finding might
materially and adversely affect the Company or its business, properties,
business prospects, condition (financial or otherwise) or results of operations.




<PAGE>   7


                                        7

                           (j) The Company has, and at the Closing Date will
have, (i) all governmental licenses, permits, consents, orders, approvals and
other authorizations necessary to carry on its business as contemplated in the
Prospectus, (ii) complied in all material respects with all laws, regulations
and orders applicable to it or its business and (iii) performed all its
obligations required to be performed by it, and is not, and at the Closing Date
will not be, in material default, under any indenture, mortgage, deed of trust,
voting trust agreement, loan agreement, bond, debenture, note agreement, lease,
contract or other material agreement or instrument (collectively, a "contract or
other agreement") to which it is a party or by which its property is bound or
affected. To the best knowledge of the Company, no other party under any
contract or other agreement to which it is a party is in default in any material
respect thereunder. The Company is not, nor at the Closing Date will be, in
violation of any provisions of its articles of incorporation or by-laws.

                           (k) No consent, approval, authorization or order of,
or any filing or declaration with, any court or governmental agency or body is
required in connection with the authorization, issuance, transfer, sale or
delivery of the Shares by the Company, in connection with the execution,
delivery and performance of this Agreement by the Company or in connection with
the taking by the Company of any action contemplated hereby, except such as have
been obtained under the Act or the Rules and Regulations and such as may be
required under state securities or Blue Sky laws or the by-laws and rules of the
National Association of Securities Dealers, Inc. (the "NASD") in connection with
the purchase and distribution by the Underwriters of the Shares.

                           (l) The Company has full corporate power and
authority to enter into this Agreement. This Agreement has been duly authorized,
executed and delivered by the Company and constitutes a valid and binding
agreement of the Company and is enforceable against the Company in accordance
with the terms hereof. The performance of this Agreement and the consummation of
the transactions contemplated hereby and the application of the net proceeds
from the offering and sale of the Shares in the manner set forth in the
Prospectus under "Use of Proceeds" will not result in the creation or imposition
of any lien, charge or encumbrance upon any of the assets of the Company
pursuant to the terms or provisions of, or result in a breach or violation of
any of the terms or provisions of, or constitute a default under, or give any
other party a right to terminate any of its obligations under, or result in the
acceleration of any obligation under, the articles of incorporation or by-laws
of the Company, any contract or other agreement to which the Company is a party
or by which the Company or any of its properties is bound or affected, or
violate or conflict with any judgment, ruling, decree, order, statute, rule or
regulation of any court or other governmental agency or body applicable to the
business or properties of the Company.

                           (m) The Company has good and marketable title to all
properties and assets described in the Prospectus as owned by it, free and clear
of all liens, charges,




<PAGE>   8


                                        8

encumbrances or restrictions, except such as are described in the Prospectus or
are not material to the business of the Company. The Company has valid,
subsisting and enforceable leases for the properties described in the Prospectus
as leased by it, with such exceptions as are not material and do not materially
interfere with the use made and proposed to be made of such properties by the
Company.

                           (n) There is no document or contract of a character
required to be described in the Registration Statement or the Prospectus or to
be filed or incorporated by reference as an exhibit to the Registration
Statement which is not described, filed or incorporated by reference as
required. All such contracts to which the Company is a party have been duly
authorized, executed and delivered by the Company, constitute valid and binding
agreements of the Company and are enforceable against the Company in accordance
with the terms thereof, except as the enforceability of such agreements may be
(i) subject to bankruptcy, insolvency, reorganization, moratorium or similar
laws affecting creditors' rights generally; and (ii) subject to general
principles of equity (regardless of whether such enforceability is considered
in a proceeding at law or in equity) including principles of commercial
reasonableness or conscionability and an implied covenant of good faith and
fair dealing.

                           (o) Neither the Company nor, to the Company's
knowledge,  any of its directors, officers or controlling persons has taken,
directly or indirectly, any action intended, or which might reasonably be
expected, to cause or result, under the Act or otherwise, in, or which has
constituted, stabilization or manipulation of the price of any security of the
Company to facilitate the sale or resale of the Shares.

                           (p) No holder of securities of the Company has rights
to the registration of any securities of the Company because of the filing of
the Registration Statement.

                           (q) The Shares have been approved for quotation on
the Nasdaq National Market.

                           (r) The Company is not involved in any material labor
dispute nor, to the knowledge of the Company, is any such dispute threatened.

                           (s) The Company owns, or is licensed or otherwise has
the full exclusive right to use, all material trademarks and trade names which
are used in or necessary for the conduct of its business as described in the
Prospectus. No claims have been asserted by any person to the use of any such
trademarks or trade names or challenging or questioning the validity or
effectiveness of any such trademark or trade name. The use, in connection with
the business and operations of the Company of such trademarks and trade names
does not, to the Company's knowledge, infringe on the rights of any person.




<PAGE>   9


                                        9

                           (t) The Company nor, to the Company's knowledge, any
employee or agent of the Company has made any payment of funds of the Company or
received or retained any funds in violation of any law, rule or regulation or of
a character required to be disclosed in the Prospectus.

                           (u) The Company has complied, and until the
completion of the distribution of the Shares will comply, with all of the
provisions of (including, without limitation, filing all forms required by)
Section 517.075 of the Florida Securities and Investor Protection Act and
regulation 3E-900.001 issued thereunder with respect to the offering and sale of
the Shares.

                           (v) The Company owns or possesses adequate licenses
or other rights to use all patents, trademarks, service marks, trade names,
copyrights, mask works, technology and know-how necessary to conduct the
business now or proposed to be conducted by it as described in the Prospectus,
and the Company has not received any notice of infringement of or conflict with
(and knows of no such infringement of or conflict with) asserted rights of
others with respect to any patents, trademarks, service marks, trade names,
copyrights, mask works, technology or know-how which could result in any
material adverse effect upon the Company; and the Company's discoveries,
inventions, products or processes referred to in the Prospectus do not, to the
knowledge of the Company, infringe or conflict with any right or patent, or any
discovery, invention, product or process which is the subject of a patent
application known to the Company, which infringement or conflict could result in
any material adverse effect upon the Company.

                           (w) The Company has obtained any permits, consents
and authorizations required to be obtained by it under laws or regulations
relating to the protection of the environment or concerning the handling,
storage, disposal or discharge of toxic materials (collectively "Environmental
Laws"), and any such permits, consents and authorizations remain in full force
and effect. The Company is in compliance with the Environmental Laws in all
material respects, and there is no pending or, to the Company's knowledge,
threatened, action or proceeding against the Company alleging violations of the
Environmental Laws.

                           (x) Except as disclosed in the Registration Statement
or the Prospectus, the Company maintains insurance of the types and in amounts
generally deemed adequate for its businesses and consistent with insurance
coverage maintained by similar companies and businesses, all of which insurance
is in full force and effect.

                  4. Agreements of the Company. The Company agrees with the
several Underwriters as follows:




<PAGE>   10
                                       10

                  (a) The Company will not, either prior to the Effective Date
or thereafter during such period as the Prospectus is required by law to be
delivered in connection with sales of the Shares by an Underwriter or dealer,
file any amendment or supplement to the Registration Statement or the
Prospectus, unless a copy thereof shall first have been submitted to the
Representatives within a reasonable period of time prior to the filing thereof
and the Representatives shall not have objected thereto in good faith.

                  (b) The Company will use its best efforts to cause the
Registration Statement to become effective, and will notify the Representatives
promptly, and will confirm such advice in writing, (1) when the Registration
Statement has become effective and when any post-effective amendment thereto
becomes effective, (2) of any request by the Commission for amendments or
supplements to the Registration Statement or the Prospectus or for additional
information, (3) of the issuance by the Commission of any stop order suspending
the effectiveness of the Registration Statement or the initiation of any
proceedings for that purpose or the threat thereof, (4) of the happening of any
event during the period mentioned in the second sentence of Section 4(e) that in
the judgment of the Company makes any statement made in the Registration
Statement or the Prospectus untrue or that requires the making of any changes in
the Registration Statement or the Prospectus in order to make the statements
therein, in light of the circumstances in which they are made, not misleading
and (5) of receipt by the Company or any representative or attorney of the
Company of any other communication from the Commission relating to the Company,
the Registration Statement, any preliminary prospectus or the Prospectus. If at
any time the Commission shall issue any order suspending the effectiveness of
the Registration Statement, the Company will make every reasonable effort to
obtain the withdrawal of such order at the earliest possible moment. The Company
will use its best efforts to comply with the provisions of and make all
requisite filings with the Commission pursuant to Rule 430A and to notify the
Representatives promptly of all such filings.

                  (c) The Company will furnish to the Representatives, without
charge, two signed copies of the Registration Statement and of any
post-effective amendment thereto, including financial statements and schedules,
and all exhibits thereto and will furnish to the Representatives, without
charge, for transmittal to each of the other Underwriters, a copy of the
Registration Statement and any post-effective amendment thereto, including
financial statements and schedules but without exhibits.

                  (d) The Company will comply with all the provisions of any
undertakings contained in the Registration Statement.

                  (e) On the Effective Date, and thereafter from time to time,
the Company will deliver to each of the Underwriters, without charge, as many
copies of the Prospectus or any amendment or supplement thereto as the
Representatives may reasonably request. The Company consents to the use of the
Prospectus or any amendment or




<PAGE>   11


                                       11

supplement thereto by the several Underwriters and by all dealers to whom the
Shares may be sold, both in connection with the offering or sale of the Shares
and for any period of time thereafter during which the Prospectus is required by
law to be delivered in connection therewith. If during such period of time any
event shall occur which in the judgment of the Company or counsel to the
Underwriters should be set forth in the Prospectus in order to make any
statement therein, in the light of the circumstances under which it was made,
not misleading, or if it is necessary to supplement or amend the Prospectus to
comply with law, the Company will forthwith prepare and duly file with the
Commission an appropriate supplement or amendment thereto, and will deliver to
each of the Underwriters, without charge, such number of copies thereof as the
Representatives may reasonably request.

                  (f) Prior to any public offering of the Shares by the
Underwriters, the Company will cooperate with the Representatives and counsel to
the Underwriters in connection with the registration or qualification of the
Shares for offer and sale under the securities or Blue Sky laws of such
jurisdictions as the Representatives may request; provided, that in no event
shall the Company be obligated to qualify to do business in any jurisdiction
where it is not now so qualified or to take any action which would subject it to
general service of process in any jurisdiction where it is not now so subject.

                  (g) During the period of five years commencing on the
Effective Date, the Company will furnish to the Representatives and each other
Underwriter who may so request copies of such financial statements and other
periodic and special reports as the Company may from time to time distribute
generally to the holders of any class of its capital stock, and will furnish to
the Representatives and each other Underwriter who may so request a copy of each
annual or other report it shall be required to file with the Commission.

                  (h) The Company will make generally available to holders of
its securities as soon as may be practicable but in no event later than the last
day of the fifteenth full calendar month following the calendar quarter in which
the Effective Date falls, an earnings statement (which need not be audited but
shall be in reasonable detail) for a period of 12 months ended commencing after
the Effective Date, and satisfying the provisions of Section 11(a) of the Act
(including Rule 158 of the Rules and Regulations).

                  (i) Whether or not the transactions contemplated by this
Agreement are consummated or this Agreement is terminated, the Company will pay,
or reimburse if paid by the Representatives, all costs and expenses incident to
the performance of the obligations of the Company under this Agreement,
including but not limited to costs and expenses of or relating to (1) the
preparation, printing and filing of the Registration Statement and exhibits to
it, each preliminary prospectus, the Prospectus and any amendment or supplement
to the Registration Statement or the Prospectus, (2) the preparation and
delivery of certificates representing the Shares, (3) the printing of this
Agreement, the




<PAGE>   12


                                       12

Agreement Among Underwriters, any Dealer Agreements and any Underwriters'
Questionnaire, (4) furnishing (including costs of shipping, mailing and courier)
such copies of the Registration Statement, the Prospectus and any preliminary
prospectus, and all amendments and supplements thereto, as may be requested for
use in connection with the offering and sale of the Shares by the Underwriters
or by dealers to whom Shares may be sold, (5) the quotation of the Shares on the
Nasdaq National Market, (6) any filings required to be made by the Underwriters
with the NASD, and the fees, disbursements and other charges of counsel for the
Underwriters in connection therewith, (7) the registration or qualification of
the Shares for offer and sale under the securities or Blue Sky laws of such
jurisdictions designated pursuant to Section 4(f), including the fees,
disbursements and other charges of counsel to the Underwriters in connection
therewith, and the preparation and printing of preliminary, supplemental and
final Blue Sky memoranda, (8) counsel to the Company, (9) the transfer agent for
the Shares and (10) the Accountants.

                  (j) If this Agreement shall be terminated by the Company
pursuant to any of the provisions hereof (otherwise than pursuant to Section 8)
or if for any reason the Company shall be unable to perform its obligations
hereunder, the Company will reimburse the several Underwriters for all
out-of-pocket expenses (including the fees, disbursements and other charges of
counsel to the Underwriters) reasonably incurred by them in connection herewith.

                  (k) The Company will not at any time, directly or indirectly,
take any action intended, or which might reasonably be expected, to cause or
result in, or which will constitute, stabilization of the price of the shares of
Common Stock to facilitate the sale or resale of any of the Shares.

                  (l) The Company will apply the net proceeds from the offering
and sale of the Shares to be sold by the Company substantially in the manner 
set forth in the Prospectus under "Use of Proceeds."

                  (m) The Company will not, and will cause each of its executive
officers, directors and each beneficial owner of more than 5% of the outstanding
shares of Common Stock to enter into agreements with the Representatives in the
form set forth in Exhibit B to the effect that they will not, for a period of 90
days after the commencement of the public offering of the Shares, without the
prior written consent of PaineWebber Incorporated, sell, contract to sell or
otherwise dispose of any shares of Common Stock or rights to acquire such shares
(other than pursuant to employee stock option plans or in connection with other
employee incentive compensation arrangements).

         5. Conditions of the Obligations of the Underwriters. In addition to
the execution and delivery of the Price Determination Agreement, the obligations
of each Underwriter hereunder are subject to the following conditions:




<PAGE>   13


                                       13

                  (a) Notification that the Registration Statement has become
effective shall be received by the Representatives not later than 5:00 p.m., New
York City time, on the date of this Agreement or at such later date and time as
shall be consented to in writing by the Representatives and all filings required
by Rule 424 of the Rules and Regulations and Rule 430A shall have been made.

                  (b) (i) No stop order suspending the effectiveness of the
Registration Statement shall have been issued and no proceedings for that
purpose shall be pending or threatened by the Commission, (ii) no order
suspending the effectiveness of the Registration Statement or the qualification
or registration of the Shares under the securities or Blue Sky laws of any
jurisdiction shall be in effect and no proceeding for such purpose shall be
pending before or threatened or contemplated by the Commission or the
authorities of any such jurisdiction, (iii) any request for additional
information on the part of the staff of the Commission or any such authorities
shall have been complied with to the satisfaction of the staff of the Commission
or such authorities and (iv) after the date hereof no amendment or supplement to
the Registration Statement or the Prospectus shall have been filed unless a copy
thereof was first submitted to the Representatives and the Representatives did
not object thereto in good faith, and the Representatives shall have received
certificates, dated the Closing Date and the Option Closing Date and signed by
the Chief Executive Officer or the Chairman of the Board of Directors of the
Company and the Chief Financial Officer of the Company (who may, as to
proceedings threatened, rely upon the best of their information and belief), to
the effect of clauses (i), (ii) and (iii).

                  (c) Since the respective dates as of which information is
given in the Registration Statement and the Prospectus, (i) there shall not have
been a material adverse change in the general affairs, business, business
prospects, properties, management, condition (financial or otherwise) or results
of operations of the Company, taken as a whole, whether or not arising from
transactions in the ordinary course of business, in each case other than as set
forth in or contemplated by the Registration Statement and the Prospectus and
(ii) the Company shall not have sustained any material loss or interference with
its business or properties from fire, explosion, flood or other casualty,
whether or not covered by insurance, or from any labor dispute or any court or
legislative or other governmental action, order or decree, which is not set
forth in the Registration Statement and the Prospectus, if in the judgment of
the Representatives any such development makes it impracticable or inadvisable
to consummate the sale and delivery of the Shares by the Underwriters at the
initial public offering price.

                  (d) Since the respective dates as of which information is
given in the Registration Statement and the Prospectus, there shall have been no
litigation or other proceeding instituted against the Company or any of its
officers or directors in their capacities as such, before or by any Federal,
state or local court, commission, regulatory body, administrative agency or
other governmental body, domestic or foreign, in which




<PAGE>   14


                                       14

litigation or proceeding an unfavorable ruling, decision or finding would
materially and adversely affect the business, properties, business prospects,
condition (financial or otherwise) or results of operations of the Company taken
at a whole.

                  (e) Each of the representations and warranties of the Company
contained herein shall be true and correct in all material respects at the
Closing Date and, with respect to the Option Shares, at the Option Closing Date,
as if made at the Closing Date and, with respect to the Option Shares, at the
Option Closing Date, and all covenants and agreements herein contained to be
performed on the part of the Company and all conditions herein contained to be
fulfilled or complied with by the Company at or prior to the Closing Date and,
with respect to the Option Shares, at or prior to the Option Closing Date, shall
have been duly performed, fulfilled or complied with.

                  (f) The Representatives shall have received an opinion, dated
the Closing Date and, with respect to the Option Shares, the Option Closing
Date, and satisfactory in form and substance to counsel for the Underwriters,
from Wilson Sonsini Goodrich & Rosati, counsel to the Company, to the effect set
forth in Exhibit C.

                  (g) The Representatives shall have received an opinion, dated
the Closing Date, and with respect to the Option Shares, the Option Closing
Date, and satisfactory in form and substance to counsel for the Underwriters,
from Townsend and Townsend and Crew LLP, patent counsel to the Company, to the
effect set forth in Exhibit D.

                  (h) The Representatives shall have received an opinion, dated
the Closing Date and the Option Closing Date, from Shearman & Sterling, counsel
to the Underwriters, with respect to the Registration Statement, the Prospectus
and this Agreement, which opinion shall be satisfactory in all respects to the
Representatives.

                  (i) On the date of the Prospectus, the Accountants shall have
furnished to the Representatives a letter, dated the date of its delivery,
addressed to the Representatives and in form and substance satisfactory to the
Representatives, confirming that they are independent accountants with respect
to the Company as required by the Act and the Rules and Regulations and with
respect to the financial and other statistical and numerical information
contained in the Registration Statement. At the Closing Date and, as to the
Option Shares, the Option Closing Date, the Accountants shall have furnished to
the Representatives a letter, dated the date of its delivery, which shall
confirm, on the basis of a review in accordance with the procedures set forth in
the letter from the Accountants, that nothing has come to their attention during
the period from the date of the letter referred to in the prior sentence to a
date (specified in the letter) not more than five days prior to the Closing Date
and the Option Closing Date which would require any change in their letter dated
the date of the Prospectus, if it were required to be dated and delivered at the
Closing Date and the Option Closing Date.




<PAGE>   15


                                       15

                  (j) At the Closing Date and, as to the Option Shares, the
Option Closing Date, there shall be furnished to the Representatives an accurate
certificate, dated the date of its delivery, signed by each of the Chief
Executive Officer and the Chief Financial Officer of the Company, in form and
substance satisfactory to the Representatives, to the effect that:

                           (i) Each signer of such certificate has carefully
         examined the Registration Statement and the Prospectus and (A) as of
         the date of such certificate, such documents are true and correct in
         all material respects and do not omit to state a material fact required
         to be stated therein or necessary in order to make the statements
         therein not untrue or misleading and (B) since the Effective Date, no
         event has occurred as a result of which it is necessary to amend or
         supplement the Prospectus in order to make the statements therein not
         untrue or misleading in any material respect.

                           (ii) Each of the representations and warranties of
         the Company contained in this Agreement were, when originally made, and
         are, at the time such certificate is delivered, true and correct in all
         material respects.

                           (iii) Each of the covenants required herein to be
         performed by the Company on or prior to the delivery of such
         certificate has been duly, timely and fully performed and each
         condition herein required to be complied with by the Company on or
         prior to the date of such certificate has been duly, timely and fully
         complied with.

                  (k) On or prior to the Closing Date, the Representatives shall
have received the executed agreements referred to in Section 4(m).

                  (l) The Shares shall be qualified for sale in such states as
the Representatives may reasonably request, each such qualification shall be in
effect and not subject to any stop order or other proceeding on the Closing Date
and the Option Closing Date.

                  (m) Prior to the Closing Date, the Shares shall have been
qualified for quotation on the Nasdaq National Market.

                  (n) The Company shall have furnished to the Representatives
such certificates, in addition to those specifically mentioned herein, as the
Representatives may have reasonably requested as to the accuracy and
completeness at the Closing Date and the Option Closing Date of any statement in
the Registration Statement or the Prospectus as to the accuracy at the Closing
Date and the Option Closing Date of the representations and warranties of the
Company herein, as to the performance by the Company of its obligations




<PAGE>   16


                                       16

hereunder, or as to the fulfillment of the conditions concurrent and precedent
to the obligations hereunder of the Representatives.

                  6. Indemnification.

                           (a) The Company will indemnify and hold harmless each
Underwriter, the directors, officers, employees and agents of each Underwriter
and each person, if any, who controls each Underwriter within the meaning of
Section 15 of the Act or Section 20 of the Securities Exchange Act of 1934, as
amended (the "Exchange Act") from and against any and all losses, claims,
liabilities, expenses and damages (including any and all investigative, legal
and other expenses reasonably incurred in connection with, and any amount paid
in settlement of, any action, suit or proceeding between any of the indemnified
parties and any indemnifying parties or between any indemnified party and any
third party, or otherwise, or any claim asserted), to which they, or any of
them, may become subject under the Act, the Exchange Act or other Federal or
state statutory law or regulation, at common law or otherwise, insofar as such
losses, claims, liabilities, expenses or damages arise out of or are based on
any untrue statement or alleged untrue statement of a material fact contained in
any preliminary prospectus, the Registration Statement or the Prospectus or any
amendment or supplement to the Registration Statement or the Prospectus, or the
omission or alleged omission to state in such document a material fact required
to be stated in it or necessary to make the statements in it not misleading,
provided that the Company will not be liable to the extent that such loss,
claim, liability, expense or damage arises from the sale of the Shares in the
public offering to any person by an Underwriter and is based on an untrue
statement or omission or alleged untrue statement or omission made in reliance
on and in conformity with information relating to any Underwriter furnished in
writing to the Company by the Representatives on behalf of any Underwriter
expressly for inclusion in the Registration Statement, any preliminary
prospectus or the Prospectus. This indemnity agreement will be in addition to
any liability that the Company might otherwise have.

                           (b) Each Underwriter will indemnify and hold harmless
the Company, each person, if any, who controls the Company within the meaning of
Section 15 of the Act or Section 20 of the Exchange Act, each director of the
Company and each officer of the Company who signs the Registration Statement to
the same extent as the foregoing indemnity from the Company to each Underwriter,
but only insofar as losses, claims, liabilities, expenses or damages arise out
of or are based on any untrue statement or omission or alleged untrue statement
or omission made in reliance on and in conformity with information relating to
any Underwriter furnished in writing to the Company by the Representatives on
behalf of such Underwriter expressly for use in the Registration Statement, the
Preliminary Prospectus or the Prospectus. This indemnity will be in addition to
any liability that each Underwriter might otherwise have.




<PAGE>   17


                                       17

                           (c) Any party that proposes to assert the right to be
indemnified under this Section 6 will, promptly after receipt of notice of
commencement of any action against such party in respect of which a claim is to
be made against an indemnifying party or parties under this Section 6, notify
each such indemnifying party of the commencement of such action, enclosing a
copy of all papers served, but the omission so to notify such indemnifying party
will not relieve it from any liability that it may have to any indemnified party
under the foregoing provisions of this Section 6 unless, and only to the extent
that, such omission results in the forfeiture of substantive rights or defenses
by the indemnifying party. If any such action is brought against any indemnified
party and it notifies the indemnifying party of its commencement, the
indemnifying party will be entitled to participate in and, to the extent that it
elects by delivering written notice to the indemnified party promptly after
receiving notice of the commencement of the action from the indemnified party,
jointly with any other indemnifying party similarly notified, to assume the
defense of the action, with counsel satisfactory to the indemnified party, and
after notice from the indemnifying party to the indemnified party of its
election to assume the defense, the indemnifying party will not be liable to the
indemnified party for any legal or other expenses except as provided below and
except for the reasonable costs of investigation subsequently incurred by the
indemnified party in connection with the defense. The indemnified party will
have the right to employ its own counsel in any such action, but the fees,
expenses and other charges of such counsel will be at the expense of such
indemnified party unless (1) the employment of counsel by the indemnified party
has been authorized in writing by the indemnifying party, (2) the indemnified
party has reasonably concluded (based on advice of counsel) that there may be
legal defenses available to it or other indemnified parties that are different
from or in addition to those available to the indemnifying party, (3) a conflict
or potential conflict exists (based on advice of counsel to the indemnified
party) between the indemnified party and the indemnifying party (in which case
the indemnifying party will not have the right to direct the defense of such
action on behalf of the indemnified party) or (4) the indemnifying party has not
in fact employed counsel to assume the defense of such action within a
reasonable time after receiving notice of the commencement of the action, in
each of which cases the reasonable fees, disbursements and other charges of
counsel will be at the expense of the indemnifying party or parties. It is
understood that the indemnifying party or parties shall not, in connection with
any proceeding or related proceedings in the same jurisdiction, be liable for
the reasonable fees, disbursements and other charges of more than one separate
firm admitted to practice in such jurisdiction at any one time for all such
indemnified party or parties. All such fees, disbursements and other charges
will be reimbursed by the indemnifying party promptly as they are incurred. An
indemnifying party will not be liable for any settlement of any action or claim
effected without its written consent (which consent will not be unreasonably
withheld). No indemnifying party shall, without the prior written consent of
each indemnified party, settle or compromise or consent to the entry of any
judgment in any pending or threatened claim, action or proceeding relating to
the matters contemplated by this Section 6 (whether or not any indemnified party
is a party thereto), unless such settlement, compromise or consent




<PAGE>   18


                                       18

includes an unconditional release of each indemnified party from all liability
arising or that may arise out of such claim, action or proceeding.

                           (d) In order to provide for just and equitable
contribution in circumstances in which the indemnification provided for in the
foregoing paragraphs of this Section 6 is applicable in accordance with its
terms but for any reason is held to be unavailable from the Company or the
Underwriters, the Company and the Underwriters will contribute to the total
losses, claims, liabilities, expenses and damages (including any investigative,
legal and other expenses reasonably incurred in connection with, and any amount
paid in settlement of, any action, suit or proceeding or any claim asserted, but
after deducting any contribution received by the Company from persons other than
the Underwriters, such as persons who control the Company within the meaning of
the Act, officers of the Company who signed the Registration Statement and
directors of the Company, who also may be liable for contribution) to which the
Company and any one or more of the Underwriters may be subject in such
proportion as shall be appropriate to reflect the relative benefits received by
the Company on the one hand and the Underwriters on the other. The relative
benefits received by the Company on the one hand and the Underwriters on the
other shall be deemed to be in the same proportion as the total net proceeds
from the offering (before deducting expenses) received by the Company bear to
the total underwriting discounts and commissions received by the Underwriters,
in each case as set forth in the table on the cover page of the Prospectus. If,
but only if, the allocation provided by the foregoing sentence is not permitted
by applicable law, the allocation of contribution shall be made in such
proportion as is appropriate to reflect not only the relative benefits referred
to in the foregoing sentence but also the relative fault of the Company, on the
one hand, and the Underwriters, on the other, with respect to the statements or
omissions which resulted in such loss, claim, liability, expense or damage, or
action in respect thereof, as well as any other relevant equitable
considerations with respect to such offering. Such relative fault shall be
determined by reference to whether the untrue or alleged untrue statement of a
material fact or omission or alleged omission to state a material fact relates
to information supplied by the Company or the Representatives on behalf of the
Underwriters, the intent of the parties and their relative knowledge, access to
information and opportunity to correct or prevent such statement or omission.
The Company and the Underwriters agree that it would not be just and equitable
if contributions pursuant to this Section 6(d) were to be determined by pro rata
allocation (even if the Underwriters were treated as one entity for such
purpose) or by any other method of allocation which does not take into account
the equitable considerations referred to herein. The amount paid or payable by
an indemnified party as a result of the loss, claim, liability, expense or
damage, or action in respect thereof, referred to above in this Section 6(d)
shall be deemed to include, for purpose of this Section 6(d), any legal or other
expenses reasonably incurred by such indemnified party in connection with
investigating or defending any such action or claim. Notwithstanding the
provisions of this Section 6(d), no Underwriter shall be required to contribute
any amount in excess of the underwriting discounts received by it and no person
found guilty of fraudulent




<PAGE>   19


                                       19

misrepresentation (within the meaning of Section 11(f) of the Act) will be
entitled to contribution from any person who was not guilty of such fraudulent
misrepresentation. The Underwriters' obligations to contribute as provided in
this Section 6(d) are several in proportion to their respective underwriting
obligations and not joint. For purposes of this Section 6(d), any person who
controls a party to this Agreement within the meaning of the Act will have the
same rights to contribution as that party, and each officer of the Company who
signed the Registration Statement will have the same rights to contribution as
the Company, subject in each case to the provisions hereof. Any party entitled
to contribution, promptly after receipt of notice of commencement of any action
against such party in respect of which a claim for contribution may be made
under this Section 6(d), will notify any such party or parties from whom
contribution may be sought, but the omission so to notify will not relieve the
party or parties from whom contribution may be sought from any other obligation
it or they may have under this Section 6(d). No party will be liable for
contribution with respect to any action or claim settled without its written
consent (which consent will not be unreasonably withheld).

                           (e) The indemnity and contribution agreements
contained in this Section 6 and the representations and warranties of the
Company contained in this Agreement shall remain operative and in full force and
effect regardless of (i) any investigation made by or on behalf of the
Underwriters, (ii) acceptance of the Shares and payment therefor or (iii) any
termination of this Agreement.

                  7. Termination. The obligations of the several Underwriters
under this Agreement may be terminated at any time on or prior to the Closing
Date (or, with respect to the Option Shares, on or prior to the Option Closing
Date), by notice to the Company from the Representatives, without liability on
the part of any Underwriter to the Company, if, prior to delivery and payment
for the Shares (or the Option Shares, as the case may be), in the sole judgment
of the Representatives, (i) trading in any of the equity securities of the
Company shall have been suspended by the Commission, by an exchange that lists
the Shares or by the Nasdaq Stock Market, (ii) trading in securities generally
on the New York Stock Exchange shall have been suspended or limited or minimum
or maximum prices shall have been generally established on such exchange, or
additional material governmental restrictions, not in force on the date of this
Agreement, shall have been imposed upon trading in securities generally by such
exchange or by order of the Commission or any court or other governmental
authority, (iii) a general banking moratorium shall have been declared by either
Federal or New York State authorities or (iv) any material adverse change in the
financial or securities markets in the United States or in political, financial
or economic conditions in the United States or any outbreak or material
escalation of hostilities or declaration by the United States of a national
emergency or war or other calamity or crisis shall have occurred the effect of
any of which is such as to make it, in the sole judgment of the Representatives,
impracticable or inadvisable to market the Shares on the terms and in the manner
contemplated by the Prospectus.




<PAGE>   20


                                       20

         8. Substitution of Underwriters. If any one or more of the Underwriters
shall fail or refuse to purchase any of the Firm Shares which it or they have
agreed to purchase hereunder, and the aggregate number of Firm Shares which such
defaulting Underwriter or Underwriters agreed but failed or refused to purchase
is not more than one-tenth of the aggregate number of Firm Shares, the other
Underwriters shall be obligated, severally, to purchase the Firm Shares which
such defaulting Underwriter or Underwriters agreed but failed or refused to
purchase, in the proportions which the number of Firm Shares which they have
respectively agreed to purchase pursuant to Section 1 bears to the aggregate
number of Firm Shares which all such non-defaulting Underwriters have so agreed
to purchase, or in such other proportions as the Representatives may specify;
provided that in no event shall the maximum number of Firm Shares which any
Underwriter has become obligated to purchase pursuant to Section 1 be increased
pursuant to this Section 8 by more than one-ninth of the number of Firm Shares
agreed to be purchased by such Underwriter without the prior written consent of
such Underwriter. If any Underwriter or Underwriters shall fail or refuse to
purchase any Firm Shares and the aggregate number of Firm Shares which such
defaulting Underwriter or Underwriters agreed but failed or refused to purchase
exceeds one-tenth of the aggregate number of the Firm Shares and arrangements
satisfactory to the Representatives and the Company for the purchase of such
Firm Shares are not made within 48 hours after such default, this Agreement will
terminate without liability on the part of any non-defaulting Underwriter or the
Company for the purchase or sale of any Shares under this Agreement. In any such
case either the Representatives or the Company shall have the right to postpone
the Closing Date, but in no event for longer than seven days, in order that the
required changes, if any, in the Registration Statement and in the Prospectus or
in any other documents or arrangements may be effected. Any action taken
pursuant to this Section 8 shall not relieve any defaulting Underwriter from
liability in respect of any default of such Underwriter under this Agreement.

         9. Miscellaneous. Notice given pursuant to any of the provisions of
this Agreement shall be in writing and, unless otherwise specified, shall be
mailed or delivered (a) if to the Company, at the office of the Company, 301
Penobscot Drive, Redwood City, California 94063, Attention: John Varian, Vice
President, Finance and Chief Financial Officer, or (b) if to the Underwriters,
to the Representatives at the offices of PaineWebber Incorporated, 1285 Avenue
of the Americas, New York, New York 10019, Attention: Corporate Finance
Department. Any such notice shall be effective only upon receipt. Any notice
under Section 7 or 8 may be made by telex or telephone, but if so made shall be
subsequently confirmed in writing.

         This Agreement has been and is made solely for the benefit of the
several Underwriters and the Company and of the controlling persons, directors
and officers referred to in Section 6, and their respective successors and
assigns, and no other person shall acquire or have any right under or by virtue
of this Agreement. The term "successors and assigns"




<PAGE>   21


                                       21

as used in this Agreement shall not include a purchaser, as such purchaser, of
Shares from any of the several Underwriters.

         All representations, warranties and agreements of the Company contained
herein or in certificates or other instruments delivered pursuant hereto, shall
remain operative and in full force and effect regardless of any investigation
made by or on behalf of any Underwriter or any of its controlling persons and
shall survive delivery of and payment for the Shares hereunder.

         Any action required or permitted to be taken by the Representatives
under this Agreement may be taken by them jointly or by PaineWebber
Incorporated.

         THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO THE CONFLICT OF LAWS
PRINCIPLES OF SUCH STATE.

         This Agreement may be signed in two or more counterparts with the same
effect as if the signatures thereto and hereto were upon the same instrument.

         In case any provision in this Agreement shall be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

         The Company and the Underwriters each hereby irrevocably waive any
right they may have to a trial by jury in respect of any claim based upon or
arising out of this Agreement or the transactions contemplated hereby.

         This Agreement may not be amended or otherwise modified or any
provision hereof waived except by an instrument in writing signed by the
Representatives and the Company.

         Please confirm that the foregoing correctly sets forth the agreement
among the Company and the several Underwriters.

                                              Very truly yours,

                                              ANERGEN, INC.

                                              By:
                                                  --------------------------
                                                    Title:




<PAGE>   22


                                       22

Confirmed as of the date first 
above mentioned:

PAINEWEBBER INCORPORATED
VECTOR SECURITIES INTERNATIONAL, INC.
Acting on behalf of themselves
and as the Representatives of the
other several Underwriters
named in Schedule I hereof.

By:      PAINEWEBBER INCORPORATED

By:
         ---------------------------
         Title:




<PAGE>   23
                                   SCHEDULE I

                                  UNDERWRITERS
<TABLE>
<CAPTION>
                                                                     Number of
     Name of                                                        Firm Shares
Underwriters                                                      to be Purchased
- ------------                                                      ---------------
<S>                                                                   <C>      
PaineWebber Incorporated
Vector Securities International, Inc.

Total    .........................................................
                                                                   -------------
                                                                      4,000,000
                                                                   -------------
</TABLE>



<PAGE>   24
                                                                       EXHIBIT A

                                  ANERGEN, INC.

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


                          PRICE DETERMINATION AGREEMENT

                                                                         -, 1996

PAINEWEBBER INCORPORATED
VECTOR SECURITIES INTERNATIONAL, INC.
  As Representatives of the several Underwriters
c/o PaineWebber Incorporated
1285 Avenue of the Americas
New York, New York 10019

Dear Sirs:

         Reference is made to the Underwriting Agreement, dated -, 1996 (the
"Underwriting Agreement"), among Anergen, Inc., a California corporation (the
"Company") and the several Underwriters named in Schedule I thereto or hereto
(the "Underwriters"), for whom PaineWebber Incorporated and Vector Securities
International, Inc. are acting as representatives (the "U.S. Representatives").
The Underwriting Agreement provides for the purchase by the Underwriters from
the Company, subject to the terms and conditions set forth therein, of an
aggregate of 4,000,000 shares (the "Firm Shares") of the Company's common stock,
no par value. This Agreement is the Price Determination Agreement referred to in
the Underwriting Agreement.

         Pursuant to Section 1 of the Underwriting Agreement, the undersigned
agree with the Representatives as follows:

         The initial public offering price per share for the Firm Shares shall
be $______.





<PAGE>   25


                                        2

         The purchase price per share for the Firm Shares to be paid by the
several Underwriters shall be $_______ representing an amount equal to the
initial public offering price set forth above, less $______ per share.

         The Company represents and warrants to each of the Underwriters that
the representations and warranties of the Company set forth in Section 3 of the
Underwriting Agreement are accurate as though expressly made at and as of the
date hereof.

         As contemplated by the Underwriting Agreement, attached as Schedule I
is a completed list of the several Underwriters, which shall be a part of this
Agreement and the Underwriting Agreement.

         THIS AGREEMENT SHALL BE GOVERNED BY THE LAW OF THE STATE OF NEW YORK
WITHOUT REGARD TO THE CONFLICT OF LAWS PRINCIPLES OF SUCH STATE.

         If the foregoing is in accordance with your understanding of the
agreement among the Underwriters and the Company, please sign and return to the
Company a counterpart hereof, whereupon this instrument along with all
counterparts and together with the Underwriting Agreement shall be a binding
agreement among the Underwriters and the Company in accordance with its terms
and the terms of the Underwriting Agreement.

                                               Very truly yours,

                                               ANERGEN, INC.

                                               By:
                                                  ------------------------
                                                  Title:




<PAGE>   26
                                        3

Confirmed as of the date 
 first above mentioned:

PAINEWEBBER INCORPORATED
VECTOR SECURITIES INTERNATIONAL, INC.
Acting on behalf of themselves
and as the Representatives
of the other several Underwriters
named in Schedule I hereof.

By:  PAINEWEBBER INCORPORATED

By:  
    -----------------------------
        Title:




<PAGE>   27
                                                                       EXHIBIT B
                                                                 June ___ , 1996

PAINEWEBBER INCORPORATED
VECTOR SECURITIES INTERNATIONAL, INC.
  As Representatives of the
  several Underwriters
c/o PaineWebber Incorporated
  1285 Avenue of the Americas
  New York, New York 10019

Dear Sirs:

         In consideration of the agreement of the several U.S. Underwriters,
pursuant to which PaineWebber Incorporated and Vector Securities International,
Inc. (the "Representatives") intend to act as Representatives to underwrite a
proposed public offering (the "Offering") of shares of Common Stock, no par
value (the "Common Stock"), of Anergen, Inc., a California corporation, as
contemplated by a registration statement (the "Registration Statement") with
respect to such shares to be filed with the Securities and Exchange Commission
on Form S-1, the undersigned hereby agrees that the undersigned will not for a
period of 90 days after the commencement of the public offering of such shares,
without the prior written consent of PaineWebber Incorporated, (1) offer to
sell, sell, contract to sell, grant an option to sell, or otherwise dispose of,
or require the Company to file with the Securities and Exchange Commission a
registration statement under the Securities Act of 1933 to register, any shares
of Common Stock or securities convertible into or exchangeable for Common Stock
or warrants or other rights to acquire shares of Common Stock of which the
undersigned is now, or may in the future become, the beneficial owner (within
the meaning of Rule 13d-3 under the Securities Exchange Act of 1934 [(other than
pursuant to employee stock option plans or in connection with other employee
incentive compensation arrangements)]1 or (2) enter into any swap or similar
agreement that transfers, in whole or in part, any of the economic consequences
of the ownership of the Common Stock, whether any such transaction described in
clause (1) or (2) above is to be settled by delivery of Common Stock or such
other securities, in cash or otherwise.

                                                    Very truly yours,

                                                    By:
                                                         ----------------------
                                                    Print
                                                    Name:
                                                         ----------------------


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

1 Insert if this letter agreement will be signed by an employee of the Company.




<PAGE>   28
                                                                       EXHIBIT C

                               Form of Opinion of
                             Counsel to the Company*

         1. The Company is a corporation duly organized, validly existing and in
good standing under the laws of the jurisdiction of its incorporation and has
full corporate power and authority to own or lease all the assets owned or 
leased by it and to conduct its business as described in the Registration 
Statement and the Prospectus.

         2. All of the outstanding shares of Common Stock have been, and the
Shares, when paid for by the Underwriters in accordance with the terms of the
Agreement, will be, duly authorized, validly issued, fully paid and
nonassessable and will not be subject to any preemptive or similar right under
(i) the statutes, judicial and administrative decisions, and the rules and
regulations of the governmental agencies of the State of California, (ii) the
Company's articles of incorporation or by-laws or (iii) any instrument, 
document, contract or other agreement referred to in the Registration Statement
or any instrument, document, contract or agreement filed as an exhibit to the
Registration Statement. Except as described in the Registration Statement or the
Prospectus, to our knowledge, there is no commitment or arrangement to issue, 
and there are no outstanding options, warrants or other rights calling for the 
issuance of, any share of capital stock of the Company to any person or any 
security or other instrument that by its terms is convertible into, exercisable
for or exchangeable for capital stock of the Company.

         3. To our knowledge, no consent, approval, authorization or order of, 
or any filing or declaration with, any court or governmental agency or body is 
required in connection with the authorization, issuance, transfer, sale or 
delivery of the Shares by the Company, in connection with the execution, 
delivery and performance of the Agreement by the Company or in connection with
the taking by the Company of any action contemplated thereby, except such as 
have been obtained under the Act and the Rules and Regulations and such as may
be required under state securities or "Blue Sky" laws or by the by-laws and 
rules of the NASD in connection with the purchase and distribution by the 
Underwriters of the Shares to be sold by the Company.


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

*        All references in this opinion to the Agreement shall include the Price
         Determination Agreement. Capitalized terms used herein and not 
         otherwise defined have the same meanings as in the Underwriting 
         Agreement.





<PAGE>   29


                                        2

         4. The authorized, issued and outstanding capital stock of the Company
is as set forth in the Registration Statement and the Prospectus under the
caption "Capitalization." The description of the Common Stock contained in the
Prospectus under the caption "Description of Capital Stock" is complete and
accurate in all material respects. The form of certificate used to evidence the
Common Stock is in due and proper form and complies in all material respects 
with all applicable statutory requirements.

         5. The Registration Statement and the Prospectus comply in all material
respects as to form with the requirements of the Act and the Rules and
Regulations (except that we express no opinion as to financial statements,
schedules and other financial data contained in the Registration Statement or
the Prospectus). To our knowledge, any instrument, document, lease, license,
contract or other agreement (collectively, "Documents") required to be described
or referred to in the Registration Statement or the Prospectus has, in all
material respects, been properly described or referred to therein and any
Document required to be filed as an exhibit to the Registration Statement has
been filed as an exhibit thereto or has been incorporated as an exhibit by
reference in the Registration Statement; and to our knowledge, no default exists
in the due performance or observance of any material obligation, agreement,
covenant or condition contained in any Document filed or required to be filed as
an exhibit to the Registration Statement.

         6. To our knowledge, except as disclosed in the Registration Statement
or the Prospectus, no person or entity has the right to require the registration
under the Act of shares of Common Stock or other securities of the Company by
reason of the filing or effectiveness of the Registration Statement.

         7. To our knowledge, the Company is not in violation of, or
in default with respect to, any law, rule, regulation, order, judgment or
decree, except as may be described in the Prospectus or such as in the aggregate
do not now have and will not in the future have a material adverse effect upon
the operations, business or assets of the Company taken as a whole.

         8. All descriptions in the Prospectus of statutes, regulations or legal
or governmental proceedings accurately and fairly present, in all material
respects, the information required to be shown.

         9. The Agreement has been duly authorized, executed and delivered by
the Company, is a valid and binding agreement of the Company and, except for the
indemnification and contribution provisions thereof, as to which we express no
opinion, is enforceable against the Company in accordance with the terms
thereof.




<PAGE>   30


                                        3

         10. The execution and delivery by the Company of, and the performance
by the Company of its agreements in, the Agreement do not and will not (i)
violate the articles of incorporation or by-laws of the Company, (ii) breach or
result in a default under, cause the time for performance of any obligation to
be accelerated under, or result in the creation or imposition of any lien,
charge or encumbrance upon any of the assets of the Company pursuant to the
terms of, (x) any indenture, mortgage, deed of trust, loan agreement, bond,
debenture, note agreement, capital lease or other evidence of indebtedness of
which we have knowledge, (y) any voting trust arrangement or any contract or
other agreement to which the Company is a party that restricts the ability of
the Company to issue securities and of which we have knowledge or (z) any
Document filed as an exhibit to the Registration Statement, which breach,
default, accelerations or impositions, individually or in the aggregate, could
reasonably be expected to have a material adverse effect on the Company's
business, properties, business prospects, condition (financial or otherwise) or
results of operations, (iii) breach or otherwise violate any existing obligation
of the Company under any court or administrative order, judgment or decree of
which we have knowledge or (iv) violate applicable provisions of any statute or
regulation in the State of California or of the United States. Delivery of
certificates for the Shares will transfer valid and marketable title thereto to
each Underwriter that has purchased such Shares in good faith and without notice
of any adverse claim with respect thereto.

         11. The Company is not an "investment company" or an "affiliated
person" of, or "promoter" or "principal underwriter" for, an "investment
company," as such terms are defined in the Investment Company Act of 1940, as
amended.

         12. We have been advised by the Nasdaq Stock Market, Inc. that the 
Shares have been duly approved for quotation on the Nasdaq National Market.

         13. The Registration Statement has become effective under the Act and,
to our knowledge, no order suspending the effectiveness of the Registration
Statement has been issued and no proceeding for that purpose has been
instituted or is pending, threatened or contemplated.

         14. To our knowledge, there are no actions, suits, proceedings or
investigations pending or overtly threatened in writing against the Company, or
any of its officers or directors in their capacities as such, before or by any
Federal, State or foreign court, governmental agency or arbitrator which if
determined adversely to the Company, would individually or in the aggregate,
have a material adverse effect on the Company or its business, properties,
business prospects, condition (financial or otherwise) or




<PAGE>   31


                                        4

results of operations, taken as a whole.

         15. We have participated in the preparation of the Registration
Statement and the Prospectus and, without assuming any responsibility for the
accuracy, completeness or fairness of the statements contained in the
Registration Statement or the Prospectus or in any amendment or supplement
thereto, nothing has come to our attention that causes us to believe that,
as of the Effective Date, the Registration Statement or any amendment thereto
contained or contains any untrue statement of a material fact or omitted or
omits to state a material fact required to be stated therein or necessary to
make the statements therein not misleading or that any Prospectus or any
amendment or supplement thereto, at the time such Prospectus was issued, at the
time any such amended or supplemented Prospectus was issued, at the Closing Date
and the Option Closing Date, contained or contains any untrue statement of a
material fact or omitted or omits to state a material fact necessary in order to
make the statements therein, in the light of the circumstances in which they
were made, not misleading (except that we express no opinion as to financial
statements, schedules and other financial data contained in the Registration
Statement or the Prospectus.

         Opinion 10 is subject to the qualification that the enforceability of
the Agreement may be: (i) subject to bankruptcy, insolvency, reorganization,
moratorium or similar laws affecting creditors' rights generally; and (ii)
subject to general principles of equity (regardless of whether such
enforceability is considered in a proceeding at law or in equity) including
principles of commercial reasonableness or conscionability and an implied
covenant of good faith and fair dealing.

         This letter is furnished by us solely for your benefit in connection
with the transactions referred to in the Agreement and may not be circulated to,
or relied upon by, any other person, except that this letter may be relied upon
by your counsel in connection with the opinion letter to be delivered to you
pursuant to Section 5(h).

         In rendering the foregoing opinion, counsel may rely, to the extent
they deem such reliance proper, on the opinions (in form and substance
reasonably satisfactory to Underwriters' counsel) of other counsel reasonably
acceptable to Underwriters' counsel as to matters governed by the laws of
jurisdictions other than the United States and the State of California, and as
to matters of fact, upon certificates of officers of the Company and of
government officials; provided that such counsel shall state that the opinion of
any other counsel is in form satisfactory to such counsel. Copies of all such
opinions and certificates shall be furnished to counsel to the Underwriters on
the Closing Date.





<PAGE>   1
                                                                     EXHIBIT 5.1

                [ON WILSON SONSINI GOODRICH & ROSATI LETTERHEAD]



                                  June 27, 1996

Anergen, Inc.
301 Penobscot Drive
Redwood City, CA  94063

         RE:      REGISTRATION STATEMENT ON FORM S-1

Ladies and Gentlemen:

         We have examined the Registration Statement on Form S-1 to be filed by
you with the Securities and Exchange Commission on June 28, 1996 (as such may
thereafter be amended or supplemented, the "Registration Statement"), in
connection with the registration under the Securities Act of 1933, as amended,
of up to 4,600,000 shares of your Common Stock, no par value (the "Shares"). We
understand that the Shares are to be sold to the underwriters of the offering
for resale to the public as described in the Registration Statement. As your
legal counsel, we have examined the proceedings taken, and are familiar with the
proceedings proposed to be taken, by you in connection with the sale and
issuance of the Shares.

         It is our opinion that, upon completion of the proceedings being taken
or contemplated by us, as your counsel, to be taken prior to the issuance of the
Shares, including the proceedings being taken in order to permit such
transaction to be carried out in accordance with applicable state securities
laws, the Shares, when issued and sold in the manner described in the
Registration Statement and in accordance with the resolutions adopted by the
Board of Directors of Anergen, Inc., will be legally and validly issued, fully
paid and nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement, including the Prospectus constituting a part thereof,
and any amendments thereto.

                                          Very truly yours,


                                          WILSON, SONSINI, GOODRICH & ROSATI
                                          Professional Corporation



                                          /s/ WILSON SONSINI GOODRICH & ROSATI

<PAGE>   1
                                                                   EXHIBIT 10.15

                    PRODUCT DEVELOPMENT AND LICENSE AGREEMENT

         This Product Development and License Agreement ("the Agreement")
entered into on June 28, 1996, is made and entered into by and between Anergen,
Inc., a California corporation, with a principal place of business at 301
Penobscot Drive, Seaport Centre, Redwood City, California 94063, U.S.A.
("ANERGEN"), and N.V. Organon, a company incorporated under the laws of The
Netherlands, having its registered place of business at P.O. Box 20, 5340 BH
Oss, The Netherlands ("ORGANON"), together referred to as "PARTIES", or
individually as a "PARTY."

         WHEREAS:

         (1) ANERGEN has developed and is developing proprietary Major
Histocompatibility Complex Class II ("MHC II" ) peptide complexes designated for
the treatment of autoimmune disease and has offered rights to its technology to
ORGANON for use in the treatment of rheumatoid arthritis ("RA"); and

         (2) ORGANON wishes ANERGEN to conduct feasibility studies leading to
the development of a product or products which incorporate a proprietary ORGANON
peptide epitope for the treatment of RA and makes use of ANERGEN's aforesaid
technology, and wishes to receive a license under ANERGEN's proprietary rights
for the purpose of development, manufacturing and marketing such product or
products; and

         (3) The PARTIES wish to enter into a collaboration to develop and
commercialize such product or products in the field of RA, on the terms and
conditions herein.

         NOW, THEREFORE, the PARTIES hereby agree as follows:

ARTICLE 1 - DEFINITIONS

In this Agreement, the following terms shall have the following meanings:

1.1      "AFFILIATE" shall mean any corporation or other entity that is directly
         or indirectly controlling, controlled by or under common control with a
         PARTY. For the purpose of this definition, "control" shall mean the
         direct or indirect ownership of more than fifty percent (50%) of the
         shares of the subject entity entitled to vote in the election of
         directors or other managing authority of such entity.

1.2      "ANERGEN KNOW-HOW" shall mean any and all confidential scientific,
         technical and engineering information, experience and know-how relating
         to the MHC PEPTIDE TECHNOLOGY that is owned, invented, developed or
         acquired (with a right to sublicense) by ANERGEN now or during the term
         of the DEVELOPMENT PROGRAM.
<PAGE>   2
1.3      "ANERGEN PATENTS" shall mean the United States patents and patent
         applications listed on Exhibit A, and any patents issuing thereon, and
         any corresponding foreign patent applications and patents, and any
         division, re-examination, continuation, continuation-in-part,
         extension, substitution or reissue of any of the preceding patent
         applications and patents.

1.4      "DEVELOPMENT PROGRAM" shall mean the research, scale-up manufacturing,
         regulatory and clinical program described in Exhibit B of this
         Agreement.

1.5      "EFFECTIVE DATE" shall mean the date this Agreement is entered into.

1.6      "FDA" shall mean the U.S. Food and Drug Administration.

1.7      "FIELD" shall mean the treatment of rheumatoid arthritis.

1.8      "FUTURE PATENTS" shall mean all patent applications in any jurisdiction
         made and owned by either PARTY, claiming inventions made by a PARTY or
         jointly by the PARTIES during and in connection with the DEVELOPMENT
         PROGRAM relating to the MHC PEPTIDE TECHNOLOGY, or the PRODUCT(S) or
         the manufacture or use thereof, and any patents issuing thereon, and
         any division, re-examination, continuation, continuation-in-part,
         extension, substitution and reissue of any of the preceding patent
         applications or patents.

1.9      "IND" shall mean an Investigational New Drug Exemption for a PRODUCT,
         as defined in the U.S.A. Food, Drug and Cosmetic Act and the
         regulations promulgated thereunder, or its equivalent in other
         countries.

1.10     "JOINT KNOW-HOW" shall have the meaning set forth in Section 14.3
         herein.

1.11     "LAUNCH DATE" shall mean the date on which a PRODUCT is first offered
         for commercial sale in any country of the TERRITORY by ORGANON or an
         ORGANON AFFILIATE or sublicensee.

1.12     "MAJOR COUNTRY" shall mean any of the United States, Japan, Germany,
         the United Kingdom, France or Italy.

1.13     "MHC PEPTIDE TECHNOLOGY" shall mean methods for making and combining a
         MHC II heterodimer or a portion thereof, or functional equivalents
         thereof, with a peptide capable of forming a complex.

1.14     "NET SALES" shall mean the invoice price billed by ORGANON, its
         AFFILIATES or its sublicensees to third parties for the sale of
         PRODUCT(S), less the following:

         (a)      trade and/or quantity discounts actually allowed and taken;

         (b)      sales, value added, or other excise taxes paid, and duties
                  actually absorbed, or allowed;


                                       -2-
<PAGE>   3
         (c)      amounts repaid or credited by reason of purchase chargebacks,
                  rebates, rejections, defects or return; and

         (d)      charges for freight, insurance, handling and transportation.

1.15     "ORGANON KNOW-HOW" shall mean any and all confidential scientific,
         technical and engineering information, experience and know-how relating
         to the PRODUCT(S), that are owned, invented, developed, or acquired
         (with a right to sublicense) by ORGANON during the term of the
         DEVELOPMENT PROGRAM, including, but not limited to, information, data,
         drawings and other materials relating to the development, manufacture,
         use and/or sale of the PRODUCT(S).

1.16     "ORGANON PATENTS" shall mean the patent applications and patents listed
         on Exhibit C, and any patents issuing thereon, and any division,
         re-examination, continuation, continuation- in-part, extension,
         substitution or reissue of any of the preceding patent applications and
         patents.

1.17     "PAYMENT COMPUTATION PERIOD" shall mean each three (3) month period
         ending on March 31st, June 30th, September 30th, and December 31st of a
         given year during the term of this Agreement.

1.18     "PLA" shall mean a Product License Application for a PRODUCT, as
         defined in the U.S.A. Food, Drug and Cosmetic Act and the regulations
         promulgated thereunder, or its equivalent in other countries.

1.19     "PRODUCT," "PRODUCTS," OR PRODUCT(S)" shall mean any pharmaceutical
         active composition for the treatment of RA developed in connection with
         the DEVELOPMENT PROGRAM, which is derived by the use of the MHC PEPTIDE
         TECHNOLOGY and which incorporates one or more specific proprietary
         ORGANON epitopes and/or an ANERGEN epitopes selected under 4.5.

1.20     "PROJECT INITIATION DATE" shall mean the date that ORGANON provides
         initial quantities of the initial ORGANON epitope to ANERGEN.

1.21     "STEERING COMMITTEE" or "SC" shall mean the joint steering committee
         responsible for the management of the initial feasibility stage of the
         DEVELOPMENT PROGRAM, described in Article 3 of this Agreement.

1.22     "TERRITORY" shall mean all countries of the world.

ARTICLE 2 - DEVELOPMENT PROGRAM


                                       -3-
<PAGE>   4
2.1      The PARTIES shall conduct the DEVELOPMENT PROGRAM with the goal of
         developing a PRODUCT OR PRODUCTS. Each PARTY shall perform its
         responsibilities under the DEVELOPMENT PROGRAM in accordance with the
         timetables set forth in the development plan.

2.2      The DEVELOPMENT PROGRAM shall have three stages, as follows:

                  (a) the initial feasibility stage shall consist of
         pre-clinical research and development, scale-up manufacture and the
         conduct of an initial Phase I/II clinical trial using samples of a
         PRODUCT to demonstrate proof of principle in RA, according to criteria
         to be established by the SC. The initial feasibility stage shall
         commence on the EFFECTIVE DATE and terminate upon the completion of the
         first Phase I/II clinical trial of the PRODUCT. For purposes of this
         Agreement, a clinical trial shall be deemed completed when all patients
         enrolled in such trial have been treated with the PRODUCT, and all
         patient case report forms have been submitted to ANERGEN or its
         designee and ANERGEN has fully reported to ORGANON in writing its
         detailed evaluation of the results of such trial;

                  (b) the second stage shall commence on the completion of the
         initial phase and terminate upon the first approval for the sale of a
         PRODUCT in a MAJOR COUNTRY, and shall consist of the conduct of further
         clinical trials, including pivotal trials, of the PRODUCT(S), and if
         appropriate, further pre-clinical studies with regard to the
         PRODUCT(S); and

                  (c) the third stage shall commence on the completion of the
         second phase and shall consist of the conduct of post-approval clinical
         studies and PRODUCT commercialization activities.

2.3      Prior to the PROJECT INITIATION DATE, the PARTIES shall agree on a
         written development plan for the activities each PARTY will conduct in
         connection with the initial feasibility stage of the DEVELOPMENT
         PROGRAM. The SC shall review the development plan on an ongoing basis
         and from time to time may make changes to the development plan;
         provided, however, the development plan shall not be modified except as
         agreed in writing by ANERGEN and ORGANON.

2.4      In the event that ORGANON after consideration by the SC and review of
         the recommendation of the SC determines that it is [*] FIELD [*] or
         [*], ORGANON may [*] subject to the terms and conditions set forth in
         this Agreement and provided [*].

      *  Certain information on this page has been omitted and filed separately
         with the Commission. Confidential treatment has been requested with
         respect to the omitted portions.

                                       -4-
<PAGE>   5
         It is understood and agreed that ORGANON [*] the epitope described on
         Exhibit D hereto (the "Initial Epitope "). Until the [*] anniversary of
         the EFFECTIVE DATE, ORGANON may [*]

         (a)      [*]
         (b)      [*]

         Notwithstanding the above, it is understood and agreed by PARTIES that
         [*]

         (c)      [*]

         (d)      [*]

         Notwithstanding the above, it is understood and agreed that [*]

         [*]

2.5      The DEVELOPMENT PROGRAM shall commence on the date of this Agreement
         and shall continue thereafter for a period of at least thirty-six (36)
         months from the PROJECT INITIATION DATE. The DEVELOPMENT PROGRAM shall
         automatically renew thereafter unless ORGANON gives ANERGEN six (6)
         months written notice not to continue the DEVELOPMENT PROGRAM; provided
         ORGANON may not give such notice prior to thirty (30) months after the
         PROJECT INITIATION DATE and provided any extension of

      *  Certain information on this page has been omitted and filed separately
         with the Commission. Confidential treatment has been requested with
         respect to the omitted portions.



                                       -5-
<PAGE>   6
         the DEVELOPMENT PROGRAM beyond the fifth anniversary of the EFFECTIVE
         DATE must be mutually agreed in writing by the PARTIES.

2.6      At least every three (3) months, the SC shall provide each PARTY with a
         written report summarizing the activities performed according to the
         initial feasibility stage of the DEVELOPMENT PROGRAM, and the costs
         incurred in connection with such activities. Periodically, but no less
         often than annually, each PARTY shall provide the SC with a written
         report summarizing the status of its PATENTS and FUTURE PATENTS
         worldwide, and any material scientific or commercial issues relating to
         the PRODUCT(S).

2.7      Except as expressly provided in Section 2.8, ORGANON shall be
         responsible for all costs projected or approved by the SC to be
         incurred in connection with the initial feasibility phase of the
         DEVELOPMENT PROGRAM (Exhibit B), including, but not limited to,
         pre-clinical research costs, the costs of clinical trials including
         product liability insurance, expenses of outside parties assisting in
         any such trial, and other clinical trial expenses, costs of toxicology
         and pharmacokinetic studies, regulatory filing fees and costs of other
         research activities. ORGANON shall pay to ANERGEN quarterly, in
         advance, amounts equal to the fully burdened direct and indirect
         expenses projected or approved by the SC to be incurred by ANERGEN in
         connection with DEVELOPMENT PROGRAM activities in the next quarter.

2.8      In the event that the SC determines that any intellectual property must
         be licensed from a third party for the conduct of the DEVELOPMENT
         PROGRAM, ORGANON shall be responsible for all license fees and costs
         associated with such license; provided, ANERGEN shall [*] of such fees
         and costs to ORGANON for a license of any intellectual property
         necessary for the use of the MHC PEPTIDE TECHNOLOGY. Unless otherwise
         agreed by the PARTIES, ANERGEN shall be the licensee of any
         intellectual property necessary for the use of the MHC PEPTIDE
         TECHNOLOGY, and ORGANON shall be the licensee of any other third party
         intellectual property. If a third party license is obtained by either
         PARTY which covers any PRODUCT(S), it is agreed the licensing PARTY
         will attempt in good faith to obtain the right to sublicense the same,
         and if it obtains such rights, will offer to sublicense such rights to
         the other PARTY for consideration equal to a pro rata share of any
         license fees, and payments for any amounts owed to the licensor for any
         activities conducted by the sublicensee, and on other terms fully
         consistent with the license. Any such sublicense will, if possible,
         have the same life as the other license rights granted herein. It is
         further agreed that each PARTY will attempt to maintain these third
         party licenses as long as they are important to the other PARTY and the
         sublicensee has not committed any breach of the sublicensed rights.

      *  Certain information on this page has been omitted and filed separately
         with the Commission. Confidential treatment has been requested with
         respect to the omitted portions.




                                       -6-
<PAGE>   7
ARTICLE 3 - STEERING COMMITTEE

3.1      In order to plan, establish budgets for, and review and monitor
         progress with respect to the initial feasibility stage of the
         DEVELOPMENT PROGRAM, ANERGEN and ORGANON shall establish a STEERING
         COMMITTEE. The SC shall be comprised of three (3) representatives of
         each PARTY, such representatives to be selected and replaced by the
         respective PARTIES.

3.2      Any approval, determination or other action of the SC must be agreed to
         by the representatives of both PARTIES, with each PARTY having one
         vote. The SC shall act to resolve, if possible, any disputes between
         the PARTIES, and to address other significant matters which may arise
         hereunder. In the event of a tie, the matter shall be referred to the
         chief executive officers of each PARTY, or their designees, who shall
         promptly negotiate in good faith to resolve such dispute. In the event
         that such individuals are unable to resolve such dispute, the matter
         shall be resolved by binding arbitration pursuant to Section 20.2.

3.3      Each year during the initial feasibility stage of the DEVELOPMENT
         PROGRAM, on or before October 31, the SC shall agree on a budget for
         the initial feasibility stage of the DEVELOPMENT PROGRAM activities to
         be conducted during the next year. Each PARTY shall finally approve the
         budget established by the SC for the next year by December 1 of each
         year. The PARTIES shall agree on the budget for the first year of the
         DEVELOPMENT PROGRAM prior to the PROJECT INITIATION DATE.

3.4      Until the termination of the initial feasibility phase of the
         DEVELOPMENT PROGRAM, the SC shall meet at least quarterly, unless
         otherwise agreed by the PARTIES, at times and places as agreed upon in
         the prior meeting of the SC. The SC shall keep written minutes of its
         meetings. ORGANON shall pay all reasonable out-of-pocket expenses,
         including, without limitation, travel and lodging expenses, associated
         with the attendance of SC representatives at SC meetings. Such
         out-of-pocket expenses shall be included as part of the DEVELOPMENT
         PROGRAM budget.

ARTICLE 4 - LICENSE GRANTS

4.1      Subject to the terms and conditions of this Agreement, ANERGEN hereby
         grants to ORGANON, and ORGANON hereby accepts, the following,
         royalty-bearing license under the ANERGEN PATENTS, ANERGEN KNOW HOW,
         and ANERGEN's interest in the FUTURE PATENTS and JOINT KNOW-HOW:

         (a)      to develop, have developed, evaluate, have evaluated, validate
                  and have validated the PRODUCT(S) in the FIELD;

         (b)      to conduct clinical and nonclinical studies with respect to
                  validation, safety and efficacy of the PRODUCT(S) in the
                  FIELD; and



                                       -7-
<PAGE>   8
         (c)      subject to Sections 10.1 and 10.3 below, to make, have made,
                  import, use, offer for sale and sell the PRODUCT(S) in the
                  FIELD in the TERRITORY.

4.2      ORGANON shall have the right (with the right to sublicense to its
         AFFILIATES and other third parties) the right to manufacture, have
         manufactured, use and sell the PRODUCT(S) developed in connection with
         the DEVELOPMENT PROGRAM, provided that such sublicensees agree in
         writing to comply with the terms and conditions of this Agreement and
         ANERGEN is an express third party beneficiary of such a sublicense
         agreement. The PRODUCT(S) may be sold under ORGANON trademarks;
         provided any such PRODUCT(S) shall bear a statement disclosing that any
         such PRODUCT(S) was developed in collaboration with and under a license
         from ANERGEN.

4.3      ORGANON hereby grants to ANERGEN, and ANERGEN hereby accepts, a
         non-exclusive, worldwide, royalty-free license (with the right to grant
         sublicenses) to use and practice the ORGANON PATENTS and ORGANON
         KNOW-HOW solely for the purpose of conducting the DEVELOPMENT PROGRAM
         and fulfilling its obligations under this Agreement.

4.4      Each PARTY shall have the right to practice and commercialize, itself
         or with third parties, the JOINT KNOW-HOW and FUTURE PATENTS outside
         the FIELD, without the consent of the other PARTY and with no
         obligation to account to the other PARTY.

4.5      ORGANON acknowledges that the PRODUCT(S) will contain one or more
         proprietary ORGANON epitopes, but that its non-MHC portion will not
         contain any ANERGEN epitopes unless the PARTIES agree to amend this
         Agreement to include an ANERGEN epitope(s) in which event as part of
         such amendment the milestone payment for IND non- rejection in Section
         6.2 shall be increased to U.S.[*] and each of the royalty rates in
         Section 7.1 shall each be increased by [*] for sales of PRODUCT(S)
         using an ANERGEN epitope.

ARTICLE 5 - PROVISIONS ON EXCLUSIVITY IN THE FIELD

5.1      [*]

5.2      After the date set forth in Section 5.1, ANERGEN shall have the right
         to enter into an agreement to research, develop and/or commercialize
         with third parties (or alone to research, develop and/or
         commercialize), products other than the PRODUCT(S) for use in the FIELD
         which incorporate the MHC PEPTIDE TECHNOLOGY, provided that such
         products do not

      *  Certain information on this page has been omitted and filed separately
         with the Commission. Confidential treatment has been requested with
         respect to the omitted portions.




                                       -8-
<PAGE>   9
         incorporate any ORGANON epitope and/or ANERGEN epitope agreed by the
         parties pursuant to Section 4.5. ANERGEN agrees that any exercise of
         such retained rights shall not prevent it from performing its
         obligations with respect to the DEVELOPMENT PROGRAM. In the event
         ANERGEN enters into an agreement with one additional third party and in
         connection therewith files a PLA, or if ANERGEN alone files a PLA with
         respect to the use of the MHC PEPTIDE TECHNOLOGY in the FIELD,
         ORGANON's rights under this Agreement shall be non-exclusive in the
         FIELD and the milestone payments and royalties due to ANERGEN
         thereafter shall be those set forth in Sections 6.2 (b) and 7.1 (b),
         respectively. ANERGEN must notify ORGANON within 10 days of any change
         in exclusivity.

ARTICLE 6 - MILESTONE PAYMENTS

6.1      On the EFFECTIVE DATE, ORGANON shall pay to ANERGEN a technology access
         fee of [*].

6.2      Within thirty (30) days following the achievement of each of the
         following milestones, ORGANON shall pay to ANERGEN the corresponding
         milestone payment set forth below.

         (a)      [*]
         (b)      [*]

      *  Certain information on this page has been omitted and filed separately
         with the Commission. Confidential treatment has been requested with
         respect to the omitted portions.




                                       -9-
<PAGE>   10
                  If ORGANON'S rights become non-exclusive pursuant to Section
5.2 resulting in milestone payments as reflected in Section 6.2(b), because an
ANERGEN or a third party PLA is filed within [*] from the filing of ORGANON'S
PLA, then [*] of the higher milestone amounts paid under Section 6.2 (a) versus
the milestone amounts that would have been paid under Section 6.2 (b) will be
creditable against future royalties to ANERGEN. If the ANERGEN or third party
PLA is filed more than [*] from the filing of ORGANON'S PLA, then [*].

6.3      [*]

ARTICLE 7 - ROYALTIES

7.1      ORGANON will pay running royalties to ANERGEN based on worldwide annual
         aggregate NET SALES by ORGANON, its AFFILIATES and sublicensees of all
         PRODUCT(S) subject to this Agreement as follows:

         (a)      [*]
         (b)      [*]
         (c)      [*]

      *  Certain information on this page has been omitted and filed separately
         with the Commission. Confidential treatment has been requested with
         respect to the omitted portions.




                                      -10-
<PAGE>   11
                  [*]
         (d)      In the event ANERGEN pursues commercialization of the MHC
                  PEPTIDE TECHNOLOGY in the FIELD alone or with more than one
                  additional third party by the filing of more than one PLA with
                  respect to a product in the FIELD (other than a PRODUCT
                  subject to this Agreement), then from the time of the filing
                  of the second PLA for such a product in a MAJOR COUNTRY by the
                  additional third party or by ANERGEN, the royalty rates in
                  Section 7 due ANERGEN shall be reduced [*].

7.2      Royalties shall be payable according to Section 7.1, on a
         country-by-country and product-by- product basis, from the LAUNCH DATE
         in such country until the later of (i) the expiration of all ANERGEN
         PATENTS and FUTURE PATENTS covering a particular PRODUCT in such
         country, or (ii)[*] following the LAUNCH DATE of such PRODUCT in such
         country.

7.3      Within thirty (30) days after the end of each PAYMENT COMPUTATION
         PERIOD, ORGANON shall send a written report to ANERGEN stating, on a
         country-by-country basis, the NET SALES and the quantity of PRODUCT(S)
         sold in the TERRITORY by ORGANON, its AFFILIATES and sublicensees, the
         percentage of royalties applicable, and the royalties payable to
         ANERGEN. Prior to January 1 of each year ORGANON shall provide to
         ANERGEN a copy of ORGANON's internal forecast for sales of PRODUCT(S)
         for such year and the blended annual royalty rate that would be payable
         for such sales. Royalties payable for the first three PAYMENT
         COMPUTATION PERIODS shall use such blended royalty rate. The report for
         the period ending March 31st of each year will include a final report
         of actual NET SALES for the prior year and the adjustment required in
         the final royalty payable for such year. A final report shall also be
         submitted within ninety (90) days after termination or expiration of
         this Agreement. All royalties, as set forth above, shall be due and
         payable to ANERGEN simultaneously with the submission by ORGANON of
         each report under this Section 7.4.

7.4      All payments due under this Agreement are quoted in U.S. dollars and
         shall be paid to ANERGEN in U.S. dollars via wire transfer to a bank
         account designated by ANERGEN. All payments that are not paid on the
         date due shall bear interest at the prime rate as reported by the Bank
         of America on the date such payment is due, calculated based on the
         number of days

      *  Certain information on this page has been omitted and filed separately
         with the Commission. Confidential treatment has been requested with
         respect to the omitted portions.



                                      -11-
<PAGE>   12
such payment is delinquent, or if such rate is not lawful, at the highest rate
permitted by applicable law.

7.5      NET SALES, and the amounts payable hereunder, shall first be determined
         in the currency of the country in which the PRODUCTS were sold, shall
         then be converted into Dutch Guilders at the exchange rate used by
         ORGANON for consolidation purposes (which shall be closely related to
         the market currency exchange rates in effect at the time of each
         conversion) and shall then be further converted into an equivalent
         amount of U.S. dollars. ORGANON will pay to ANERGEN the amount due in
         U.S. dollars by applying the appropriate exchange rate published in The
         Wall Street Journal on the last banking day of the relevant PAYMENT
         COMPUTATION PERIOD.

7.6      ORGANON and its AFFILIATES and sublicensees shall keep records of the
         sales of the PRODUCTS in sufficient detail to permit the determination
         of the royalties due and payable to ANERGEN. At the request and expense
         of ANERGEN, ORGANON shall permit an independent auditor or certified
         public accountant, appointed by ANERGEN and reasonably acceptable to
         ORGANON, to examine these records during ordinary business hours to
         verify the royalties due and payable to ANERGEN under this Agreement.
         Inspections shall be at the expense of ANERGEN, unless there has been
         an underpayment of five percent (5%) or more in any reporting period,
         in which event the costs of such inspection shall be borne by ORGANON.
         The results of any such examination shall be made available to both
         ANERGEN and ORGANON. ORGANON's agreements with its AFFILIATES and
         sublicensees shall include record keeping provisions and audit rights
         on behalf of ANERGEN substantially similar to this Section 7.7.

ARTICLE 8 - TAXES

         Each PARTY undertakes to cooperate with the other party to achieve the
         tax arrangements which are most favorable for the PARTIES, within the
         limits of applicable law. ORGANON may withhold from payments made to
         ANERGEN under this Agreement any income taxes required to be withheld
         by ORGANON in relation to payments to ANERGEN under the applicable laws
         of the relevant countries. Such amount shall be paid to the appropriate
         taxing authorities and ORGANON shall provide ANERGEN with official
         receipts issued by said taxing authority or such other evidence as is
         reasonably available to establish that such taxes have been paid and
         are available for credit by ANERGEN for United States income tax
         purposes. Notwithstanding the foregoing, ORGANON shall assist ANERGEN
         and take all actions reasonably necessary in order to secure a
         reduction or elimination of withholding taxes pursuant to any income
         tax treaty in force between the United States and the relevant
         countries.

ARTICLE 9 - EXCHANGE OF KNOW-HOW

                                      -12-
<PAGE>   13
9.1      Pursuant to the license granted in Article 4, each PARTY shall provide
         the other PARTY with all the KNOW-HOW necessary to conduct the
         DEVELOPMENT PROGRAM during the term thereof, without unreasonable
         delay.

9.2      During the term of this Agreement, each PARTY shall promptly provide to
         the other PARTY all safety and efficacy data, information and results
         developed or acquired by it with respect to the PRODUCTS; provided
         however, neither PARTY shall be obliged to disclose data, information
         and results which that PARTY is legally prevented from disclosing. Each
         PARTY shall have the right to use such data, information and results
         developed by the other PARTY without charge to such PARTY to exercise
         its rights and perform its obligations under this Agreement. Each PARTY
         shall keep such data, information and results confidential, whether
         developed by either PARTY, according to the provisions of Article 12.

9.3      All KNOW-HOW and other INFORMATION (as defined in Article 12) furnished
         by one PARTY to the other PARTY hereunder shall remain the property of
         the disclosing PARTY.

9.4      Each PARTY will assist the other PARTY in understanding its KNOW-HOW,
         as judged useful by the SC.

9.5      ORGANON shall have access to and the right to use, free of any charge,
         any parts of the IND and PLA submission dossiers and files prepared by
         ANERGEN in connection with any governmental approval of any PRODUCT.
         ANERGEN shall have access, free of charge, to such parts of the IND and
         PLA submission dossiers and files prepared by ORGANON as is reasonably
         required in connection with any governmental approval of any PRODUCT
         and, only after the explicit prior written approval of ORGANON (not to
         be unreasonably withheld), shall have the right to use such
         information. If such use relates to any commercialization, the PARTIES
         shall negotiate in good faith a reasonable compensation to ORGANON for
         such use.

ARTICLE 10 - SUPPLY OF MATERIALS DURING INITIAL FEASIBILITY PERIOD

10.1     ORGANON shall have the right to make and supply to ANERGEN all peptide
         and ANERGEN shall make, or have made, and supply to ORGANON all MHC II
         and PRODUCT(S) necessary for development work (including preclinical
         and clinical investigation) to be conducted during the DEVELOPMENT
         PROGRAM, subject to Section 10.2 below, and ANERGEN's capacity
         limitations. ORGANON will reimburse ANERGEN for all fully burdened
         direct and indirect costs related to the manufacture and supply of MHC
         II and PRODUCT(S) (exclusive of peptide provided by ORGANON) necessary
         for the conduct of the DEVELOPMENT PROGRAM. If ORGANON does not provide
         the peptide, ANERGEN will procure such peptide from a third party and
         be reimbursed the costs thereof.

10.2     The SC shall supply ANERGEN with estimates of the quantities of the MHC
         II and/or epitope required during the DEVELOPMENT PROGRAM for
         preclinical and clinical


                                      -13-
<PAGE>   14
         investigation purposes. Such estimates shall form the basis for orders
         to be submitted by ORGANON to ANERGEN for the MHC II and/or epitope and
         ANERGEN shall inform ORGANON of the quantity of epitope required, in a
         form and subject to a procedure to be agreed between the PARTIES.

ARTICLE 11 - COMMERCIALIZATION

11.1     Following the termination of the initial phase of the DEVELOPMENT
         PROGRAM and until the first PLA approval in the United States or a
         MAJOR COUNTRY, ORGANON shall use its reasonable best efforts to
         complete development of a PRODUCT or PRODUCTS for the use of the
         PRODUCT(S) for the treatment of RA. ORGANON shall prepare an annual
         development plan and provide a copy of such plan to ANERGEN within
         thirty (30) days prior to each calendar year and shall provide ANERGEN
         with a copy of any material revisions to such plan during the year. If
         pursuant to Section 7.1(d), ANERGEN, alone or with a third party, files
         two or more PLAs with respect to products in the FIELD (other than
         PRODUCTS subject to this Agreement), as of the date of filing of the
         second such PLA ORGANON shall no longer be required to prepare or
         provide ANERGEN with an annual development plan.

11.2     Following the first PLA approval, ORGANON shall use its reasonable best
         efforts to commercialize the PRODUCT(S) throughout the TERRITORY. After
         the first PLA filing with respect to a PRODUCT, ORGANON shall prepare
         and provide ANERGEN a reasonable plan for worldwide commercialization,
         which may include a staged introduction of the PRODUCT(S) in different
         countries. ORGANON shall promptly provide to ANERGEN all material
         updates of the plan, as it may be revised from time to time. If
         pursuant to Section 7.1(d), ANERGEN, alone or with a third party, files
         two or more PLAs with respect to products in the FIELD (other than
         PRODUCTS subject to this Agreement), as of the date the filing of the
         second such PLA ORGANON shall no longer be required to prepare or
         provide ANERGEN with updates to the commercialization plan.

11.3     ANERGEN shall have an exclusive option to co-promote the PRODUCT(S) in
         the United States and Canada, together with ORGANON, its AFFILIATES or
         sublicensees, under terms and conditions to be mutually agreed. Within
         thirty-six (36) months after ANERGEN receives notice from ORGANON of a
         PLA filing for the PRODUCT(S) in the United States, ANERGEN shall
         notify ORGANON of its intention to exercise such co-promotion right. If
         ANERGEN does not exercise such co-promotion right within said
         thirty-six (36) month period, the option to co-promote will expire. If
         requested by either PARTY, the PARTIES shall negotiate in good faith
         the terms of separate agreements for such co-promotion relationship in
         the United States and/or Canada, and provided such terms shall reflect
         the respective contributions of the PARTIES during the DEVELOPMENT
         PROGRAM, including amounts expended by the PARTIES on research and
         clinical trial costs, PRODUCT registration fees, patent expenses and
         the like. If ANERGEN co-promotes the PRODUCT(S), both PARTIES will
         market and conduct sales activities for the PRODUCT(S), and ORGANON
         will remunerate ANERGEN for such marketing and sales


                                      -14-
<PAGE>   15
         activities, commensurate with the level of effort expended, as mutually
         agreed. The PARTIES agree that all PRODUCT(S) sales shall be invoiced
         by ORGANON. If during the thirty six (36) month period following notice
         from ORGANON of a PLA filing in the United States with respect to a
         PRODUCT, ANERGEN, pursuant to Section 7.1(d), alone or with a third
         party, files a PLA in the United States with respect to a product in
         the FIELD (other than PRODUCT subject to this Agreement), then ANERGEN
         shall be required to notify ORGANON of its intention to exercise such
         co-promotion right thereto within thirty (30) days of such change.

11.4     Insofar as required to perform co-promotion, in the event that ANERGEN
         exercises its option to co-promote, ORGANON shall grant to ANERGEN a
         non-exclusive, royalty-free license under the ORGANON PATENTS, ORGANON
         KNOW-HOW and ORGANON's interest in and FUTURE KNOW-HOW and FUTURE
         PATENTS (with the right to sublicense to an AFFILIATE in the relevant
         territory) to offer for sale the PRODUCT(S) in the United States and/or
         Canada.

11.5     Prior to the completion of the initial Phase I/II clinical trial of a
         PRODUCT, ANERGEN shall disclose to ORGANON all ANERGEN KNOW-HOW
         relating to the manufacture of the PRODUCT(S). Prior to the
         commencement of the first Phase III clinical trial of a PRODUCT(S), the
         PARTIES shall [*]. The PARTIES shall negotiate [*] and/or the
         PRODUCT(S) to be sold in certain agreed geographic regions.

11.6     Upon termination of this Agreement with respect to the TERRITORY or a
         MAJOR COUNTRY, the PARTIES shall discuss in good faith either (i) a
         grant of rights to ANERGEN with respect to any ORGANON manufacturing
         technology necessary or useful for the manufacture of the PRODUCT(S)
         (including an obligation to transfer such technology and provide
         reasonable technical assistance and training with respect thereto and
         an interim supply obligation), or (ii) if the PARTIES cannot negotiate
         such an agreement, a supply agreement for the PRODUCT(S), pursuant to
         reasonable terms and conditions. If pursuant to Section 7.1(d),
         ANERGEN, alone or with a third party, files a PLA with respect to
         products in the FIELD (other than PRODUCTS subject to this Agreement)
         as of the date of filing of such PLA, Section 11.6 shall no longer
         apply.

      *  Certain information on this page has been omitted and filed separately
         with the Commission. Confidential treatment has been requested with
         respect to the omitted portions.




                                      -15-
<PAGE>   16
ARTICLE 12 - CONFIDENTIALITY

12.1     During the term of this Agreement, and for a period of ten (10) years
         after its termination or expiration, each PARTY (the "RECEIVING PARTY")
         shall hold in confidence and not disclose to any third party, (except
         to AFFILIATES and permitted sublicensees) or use for any purpose other
         than as permitted or required by this Agreement, any KNOW-HOW or other
         confidential information ("INFORMATION") disclosed by or acquired from
         the other PARTY hereto (the "DISCLOSING PARTY") without prior written
         consent of the DISCLOSING PARTY. This confidentiality obligation shall
         not apply to information which that PARTY (the "RECEIVING PARTY") can
         demonstrate to the reasonable satisfaction of the DISCLOSING PARTY:

         (a)      was in the possession of the RECEIVING PARTY prior to the
                  disclosure thereof by the DISCLOSING PARTY without a
                  confidentiality obligation; or

         (b)      was at the time of disclosure, or thereafter becomes public
                  knowledge, through no fault of the RECEIVING PARTY; or

         (c)      is acquired lawfully by the RECEIVING PARTY from a third party
                  who has no secrecy obligation to the DISCLOSING PARTY; or

         (d)      is obtained through the PARTY's in-house development,
                  independent of this Agreement.

12.2     Prior written consent shall be deemed to have been given:

         (a)      to the disclosure of INFORMATION to any regulatory authority
                  insofar as necessary in connection with an application for
                  registration of the PRODUCT in any country of the TERRITORY;

         (b)      to the disclosure of INFORMATION insofar as necessary in
                  connection with any clinical trial of the PRODUCT to persons
                  involved in the conduct of such trial, provided they are bound
                  by obligations of confidentiality acceptable to the PARTIES;
                  and

         (c)      to the disclosure of INFORMATION to employees and consultants
                  on a "need to know" basis, provided they are bound by
                  obligations of confidentiality at least equivalent to those in
                  this Article.

12.3     Any publication or patent applications based on all or any part of the
         DEVELOPMENT PROGRAM, or the results of the DEVELOPMENT PROGRAM, shall
         be submitted to the other PARTY by the PARTY wishing to publish the
         material or file or abandon the patent application as contemplated by
         this Agreement. The SC shall make a recommendation



                                      -16-
<PAGE>   17
         regarding publication or filing or abandonment of the patent
         application as applicable within thirty (30) days after receiving such
         request.

12.4     The PARTIES shall not issue any press release concerning this Agreement
         or any activities related thereto without consulting with the other;
         provided, however that either PARTY may disclose this Agreement or
         information regarding the terms of the Agreement which are not
         confidential or the activities conducted hereunder from time to time
         without the other PARTY's approval, (i) if such approval has been
         requested and not received within seventy- two (72) hours and such
         PARTY reasonably believes disclosure is required by law or (ii) if such
         information has already become publicly available without a breach of
         the confidentiality provisions of this Agreement.

12.5     Notwithstanding any other provision of this Article 12, either PARTY
         may disclose this Agreement and the terms hereof as required by law,
         and to its attorneys and other professional advisors, its investment
         bankers, and, subject to obligations of confidentiality at least
         equivalent to those of this Article, actual and prospective investors.

ARTICLE 13 - REPRESENTATIONS AND WARRANTIES

         ANERGEN and ORGANON specifically disclaim any guarantee that the
         DEVELOPMENT PROGRAM will be successful in whole or part. ANERGEN MAKES
         NO REPRESEN TATIONS AND WARRANTIES WITH RESPECT TO THE ANERGEN PATENTS,
         FUTURE PATENT RIGHTS, PRODUCT, MHC PEPTIDE TECHNOLOGY OR ANERGEN
         KNOW-HOW, WHETHER EXPRESS, IMPLIED, OR STATUTORY, INCLUDING BUT NOT
         LIMITED TO, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
         PURPOSE, VALIDITY, OR NON-INFRINGEMENT OF THE INTELLECTUAL PROPERTY
         RIGHTS OF THIRD PARTIES. NOTWITH STANDING THE FOREGOING, ANERGEN
         REPRESENTS AND WARRANTS THAT: (i) ANERGEN IS THE OWNER OF THE ANERGEN
         PATENTS AS OF THE EFFECTIVE DATE; (ii) IT HAS NOT GRANTED TO ANY PARTY
         OTHER THAN ORGANON A LICENSE UNDER THE ANERGEN PATENTS WITHIN THE
         FIELD, (iii) TO THE BEST OF ANERGEN'S KNOWLEDGE AS OF THE EFFECTIVE
         DATE, NO THIRD PARTY CURRENTLY HAS FILED, PURSUED OR MAINTAINED OR HAS
         THREATENED TO FILE, PURSUE OR MAINTAIN, ANY CLAIM, CHARGE, COMPLAINT OR
         OTHER ACTION ALLEGING THAT THE ANERGEN PATENTS ARE INVALID OR
         UNENFORCEABLE AND (iv) TO THE BEST OF ANERGEN'S KNOWLEDGE, AS OF THE
         EFFECTIVE DATE, ANERGEN IS NOT AWARE OF ANY POSSIBLE FUTURE
         INFRINGEMENT OF THIRD PARTY PATENTS BY ANERGEN IN THE FIELD. IN
         ADDITION, ANERGEN IS NOT AWARE OF ANERGEN'S PATENTS OR PATENT
         APPLICATIONS LIKELY TO BECOME THE SUBJECT OF INTERFERENCE PROCEEDINGS
         WITH THIRD PARTY PATENTS OR PATENT APPLICATIONS IN THE U.S. PATENT
         OFFICE.



                                      -17-
<PAGE>   18
ARTICLE 14 - OWNERSHIP OF INTELLECTUAL PROPERTY

14.1     ANERGEN shall retain all right, title and interest in and to any
         KNOW-HOW invented, developed or acquired solely by ANERGEN and the
         ANERGEN PATENTS.

14.2     ORGANON shall retain all right, title and interest in and to any
         KNOW-HOW invented, developed or acquired solely by ORGANON and the
         ORGANON PATENTS.

14.3     All right, title and interest in and to KNOW-HOW, whether or not
         patentable, that is invented or developed by at least one employee or
         agent of ANERGEN and at least one employee or agent of ORGANON in
         connection with the DEVELOPMENT PROGRAM shall be owned jointly by
         ORGANON and ANERGEN ("JOINT KNOW-HOW"). Inventorship of inventions and
         other intellectual property conceived and reduced to practice in
         connection with the DEVELOPMENT PROGRAM, and the rights of ownership
         with respect to such inventions and other intellectual property,
         whether such JOINT KNOW-HOW is patentable or not, shall be determined
         in accordance with United States patent law if conceived or reduced to
         practice in the USA, and in accordance with Dutch law if conceived and
         reduced to practice elsewhere.

ARTICLE 15 - PATENT PROSECUTION AND ENFORCEMENT

15.1     ANERGEN will be responsible for the preparation, prosecution and
         maintenance of the ANERGEN PATENTS and FUTURE PATENTS owned solely by
         ANERGEN and conducting oppositions, re-examination and interferences
         with respect thereto, using patent counsel of its choice and according
         to ANERGEN's reasonable business and scientific judgment. ANERGEN will
         pay all costs of conducting such activities with respect to such
         PATENTS.

15.2     Each PARTY will cooperate with the other as reasonably requested in
         obtaining patent protection for JOINT KNOW-HOW and shall agree on which
         PARTY shall have principal authority for conducting such activities
         with respect to such FUTURE PATENTS. Each PARTY shall keep the other
         informed as to material developments in this regard. ANERGEN and
         ORGANON shall equally share the expenses related to obtaining and
         maintaining patents with regard to any inventions within the JOINT
         KNOW-HOW in the names of ANERGEN and ORGANON; provided, with ninety
         (90) days notice either PARTY may continue to decline to fund such
         activities with regard to any patent application or patent within the
         FUTURE PATENTS, and in such event such PARTY shall assign its entire
         interest in such patent application or patent to the other PARTY
         hereto.

15.3     ANERGEN and ORGANON will immediately inform each other of any actual or
         suspected infringement of the ANERGEN PATENTS, ORGANON PATENTS or
         FUTURE PATENTS by third parties which such PARTY would reasonably
         believe would effect the commercial success of a PRODUCT.



                                      -18-
<PAGE>   19
15.4     Unless otherwise agreed between the PARTIES, ANERGEN shall have the
         right, but not the obligation, to bring proceedings against any
         infringer of the ANERGEN PATENTS and FUTURE PATENTS owned solely by
         ANERGEN, at ANERGEN's risk and expense. ANERGEN shall be entitled to
         retain any award or damages obtained in any such suit or proceeding to
         the extent of the costs incurred to bring such proceedings, with the
         remainder apportioned by good faith negotiation of the PARTIES to
         reflect losses suffered. At ANERGEN's request and expense, ORGANON
         shall give ANERGEN all reasonable assistance required to institute and
         carry on any such suit or proceeding.

15.5     If ANERGEN does not advise ORGANON within two (2) months after receipt
         of notice of infringement from ORGANON of ANERGEN's intention to pursue
         a commercially significant patent infringement matter relating solely
         to an infringement of an ANERGEN PATENT or FUTURE PATENT owned solely
         by ANERGEN in the FIELD, ORGANON shall have the right and may elect to
         prosecute and fund such matter. If ORGANON has brought an action for
         patent infringement at its own expense, ORGANON may keep any judgment
         and awards arising from such an action. ANERGEN shall give ORGANON all
         reasonable assistance, at ORGANON's request and expense, required to
         institute and carry on any such suit or proceeding.

15.6     The PARTIES shall consult and jointly prosecute infringement actions
         with respect to jointly owned FUTURE PATENTS and shall share the costs
         of such actions and any proceeds thereof, provided if any PARTY elects
         not to participate, the other PARTY shall have the right, at its own
         expense, to prosecute infringement actions in such patents, without a
         duty to account to the other for the proceeds thereof.

ARTICLE 16 - TERM AND TERMINATION

16.1     This Agreement shall become effective as of the EFFECTIVE DATE, and
         unless terminated earlier in accordance with this Agreement, shall
         continue in full force and effect on a country- by-country basis, as
         long as ORGANON is engaged in developing or commercializing a PRODUCT
         in such country.

16.2     If a PARTY hereto commits a material breach of any provision of this
         Agreement, and fails to remedy such breach within ninety (90) days
         after written notice thereof by the other PARTY, in addition to
         remedies for damages and/or injunctive relief, the PARTY not in default
         may, at its option, terminate this Agreement, and the licenses granted
         herein, by giving thirty (30) days prior written notice to the PARTY in
         default.

16.3     In addition to the provisions in Section 2.5 affecting the DEVELOPMENT
         PROGRAM, ORGANON may terminate this Agreement, and the licenses granted
         herein, with respect to any PRODUCT in any country in the TERRITORY by
         giving ninety (90) days (except as in Section 16.3(d), in which case it
         will be one hundred eighty (180) days or such shorter period as PARTIES
         may mutually agree to), prior written notice to ANERGEN:



                                      -19-
<PAGE>   20
         (a)      if ORGANON determines that the PRODUCT cannot reasonably be
                  developed or marketed in such country for reasons of safety or
                  efficacy or for other scientific, medical or commercial
                  reasons of a compelling nature;

         (b)      if the PRODUCT cannot be commercially marketed in any such
                  country as a result of a final written official governmental
                  unappealable or unappealed order, which ORGANON has used
                  reasonable efforts to appeal;

         (c)      if the PRODUCT would infringe patent rights held by third
                  parties, with the result that the sale and distribution of the
                  PRODUCT by ORGANON in such country, is or would be likely to
                  be enjoined or otherwise prohibited; or

         (d)      if during the DEVELOPMENT PROGRAM it is mutually agreed in
                  writing by PARTIES following good faith discussions that the
                  development of the PRODUCT cannot be pursued due to
                  fundamental medical, scientific, or safety issues.

16.4     ANERGEN may request arbitration to terminate this Agreement with
         respect to any PRODUCT in any country in the TERRITORY in which ORGANON
         failed to exercise its obligations to commercialize such PRODUCT
         pursuant to Article 11.

16.5     In any country in which ORGANON's rights and licenses to the PRODUCT
         terminate hereunder, ANERGEN shall have the right to fully exploit the
         PRODUCT in such country, itself or with a third party for use within
         the FIELD unless ORGANON'S reasons for not exploiting such rights in
         that country were for safety, efficacy, regulatory or economic
         nonfeasibility (for which ORGANON shall be required to provide a
         reasonable basis) reasons rather than solely commercial reasons.

16.6     Any termination of this Agreement shall not affect any accrued rights
         or liabilities of either PARTY, without prejudice to its other rights
         or remedies at law, or in equity.

16.7     Upon early termination of this Agreement, each PARTY shall return to
         the other all KNOW- HOW and other INFORMATION of the other PARTY,
         except one copy which may be retained for archival purposes.

16.8     Sections 11.6, 15.2, 15.6, and Articles 7 (as to obligations incurred
         prior to termination), 8 (as to obligations incurred prior to
         termination), 12, 14, 17, 19, 20 and 21 shall survive the termination
         of this Agreement for any reason.

ARTICLE 17 - FORCE MAJEURE

17.1     If either PARTY is affected by circumstances beyond its reasonable
         control, such as any Act of God, earthquake, flood, fire, riot, war,
         accident, labor disturbance, breakdown of plant or equipment, lack or
         failure of transportation facilities, sources of supply or labor, raw



                                      -20-
<PAGE>   21
         materials, power or supplies, infectious diseases of animals, or by
         reason of any law, order, proclamation, regulation, ordinance, demand
         or requirement of any relevant government or any subdivision, authority
         or representative thereof ("Force Majeure"), it shall, as soon as
         reasonably practicable, notify the other PARTY of the nature and extent
         thereof and take all reasonable steps to minimize the loss occasioned
         to that other PARTY.

17.2     Neither PARTY shall be deemed to be in breach of this Agreement or
         otherwise be liable to the other PARTY by reason of any delay in
         performance or nonperformance of any of its obligations hereunder to
         the extent that such delay or nonperformance is due to any Force
         Majeure of which it has notified the PARTY, and the time for
         performance of that obligation shall be extended accordingly.

17.3     If the Force Majeure in question prevails for a continuous period of
         more than three (3) months, the PARTIES shall enter into good faith
         discussions with a view to alleviating its effect or agreeing upon such
         alternative arrangements as may be fair and reasonable. Failure by the
         PARTIES to reach a mutually satisfactory agreement within a further
         period of three (3) months after entering into such discussions, shall
         entitle either PARTY to commence arbitration upon notice in writing.

ARTICLE 18 - ASSIGNMENT

18.1     This Agreement shall not be assigned by either PARTY except that either
         PARTY may assign this Agreement to an AFFILIATE, or a successor of all
         or substantially all of such PARTY's business or assets.

ARTICLE 19 - INDEMNIFICATION

19.1     ANERGEN shall indemnify ORGANON and its AFFILIATES, and the directors,
         officers, employees, agents and counsel of ORGANON and such AFFILIATES,
         and the successors and assigns of any of the foregoing (the "ORGANON
         Indemnitees"), harmless from and against any and all liabilities,
         damages, losses, costs or expenses (including reasonable attorneys' and
         professional fees and other expenses of litigation and/or arbitration)
         resulting from a claim, suit or proceeding brought by a third party
         against a ORGANON Indemnitee, arising from or occurring as a result of
         activities performed by ANERGEN in the DEVELOPMENT PROGRAM, or the
         manufacture or co-promotion of the PRODUCT(S) by ANERGEN, except to the
         extent caused by the negligence or willful misconduct of ORGANON.

19.2     ORGANON shall indemnify ANERGEN and its AFFILIATES and the directors,
         officers, employees, agents and counsel of ANERGEN and such AFFILIATES
         and the successors and assigns of any of the foregoing (the "ANERGEN
         Indemnitees"), from and against any and all liabilities, damages,
         losses, costs or expenses (including reasonable attorneys' and
         professional


                                      -21-
<PAGE>   22
         fees and other expenses of litigation and/or arbitration) resulting
         from a claim, suit or proceeding brought by a third party against a
         ANERGEN Indemnitee, arising from or occurring as a result of activities
         performed by ORGANON in the DEVELOPMENT PROGRAM, or the manufacture or
         commercialization of the PRODUCT(S) by ORGANON or its AFFILIATES or
         sublicensees, except to the extent caused by the negligence or willful
         misconduct of ANERGEN.

19.3     A PARTY (the "Indemnitee") that intends to claim indemnification under
         this Article 19 shall promptly notify the other party (the
         "Indemnitor") in writing of any loss, claim, damage, liability or
         action in respect of which the Indemnitee or any of its AFFILIATES,
         Sublicensees or their directors, officers, employees or agents intend
         to claim such indemnification, and the Indemnitor shall have the right
         to participate in, and, to the extent the Indemnitor so desires, to
         assume the defense thereof with counsel mutually satisfactory to the
         PARTIES. The indemnity agreement in this Article 19 shall not apply to
         amounts paid in settlement of any loss, claim, damage, liability or
         action if such settlement is effected without the consent of the
         Indemnitor, which consent shall not be withheld unreasonably. The
         failure to deliver written notice to the Indemnitor within a reasonable
         time after the commencement of any such action, if prejudicial to its
         ability to defend such action, shall relieve such Indemnitor of any
         liability to the Indemnitee under this Article 19. At the Indemnitor's
         request, the Indemnitee under this Article 19, and its employees and
         agents, shall cooperate fully with the Indemnitor and its legal
         representatives in the investigation of any action, claim or liability
         covered by this indemnification and provide full information with
         respect thereto.

ARTICLE 20 - GOVERNING LAW AND ARBITRATION

20.1     This Agreement shall be governed by and construed in accordance with
         the laws of New York, without reference to principles of conflicts of
         law.

20.2     The PARTIES shall attempt in good faith to resolve promptly by
         negotiation any dispute which may arise out of or in connection with
         this Agreement or the application, interpretation, implementation,
         validity, breach or termination of this Agreement, any provision
         thereof or any agreement concluded in pursuant of this Agreement.

20.3     If the dispute has not been resolved by negotiation within forty-five
         (45) days of the disputing party's notice, or if the PARTIES fail to
         meet within twenty (20) days as from such notice, the PARTIES shall
         endeavor to settle the dispute by mediation under the current European
         CPR Mediation Procedure for Business Disputes. Unless otherwise agreed,
         the PARTIES shall select a mediator from the European CPR Panels of
         Neutrals.

20.4     If the dispute has not been resolved by non-binding means as provided
         in 20.3 above within ninety (90) days of the initiation of such
         procedure, the dispute shall be finally and exclusively settled by the
         arbitration in New York, New York, under the Uncitral Arbitration Rules
         by three (3) arbitrators appointed in accordance with said Rules. The
         appointing authority shall


                                      -22-
<PAGE>   23
         be the International Chamber of Commerce in Zurich. The language of the
         arbitration shall be English. The arbitration shall be in lieu of any
         other remedy and the award shall be final, binding and enforceable by
         any court having jurisdiction for that purpose.

ARTICLE 21 - MISCELLANEOUS

21.1     Nothing in this Agreement shall be construed as conferring a right to
         use in advertising, publicity or otherwise any trademark or trade name
         of the other PARTY, without the other PARTY's prior express written
         permission.

21.2     No failure or delay by any PARTY in exercising any right or remedy
         shall operate as a waiver thereof, nor shall any single or partial
         exercise or waiver of any right or remedy preclude its further exercise
         or the exercise of any other right or remedy.

21.3     This Agreement shall not constitute either PARTY as the joint venturer,
         legal representative or agent of the other PARTY for any purpose
         whatsoever. Neither PARTY shall have any right or authority to assume
         or create any obligation or responsibility for or on behalf of the
         other PARTY, or to otherwise bind the other PARTY.

21.4     Any notice required or permitted to be given under this Agreement shall
         be made in writing and shall be deemed to have been sufficiently given,
         for all purposes, if mailed by registered or certified mail, return
         receipt requested, or by private overnight delivery services, or by
         telefax and confirmed by registered or certified mail, addressed to
         such other PARTY at its respective address, as follows:

         If to:   N.V. Organon
                  P.O. Box 20
                  5340 BH Oss
                  The Netherlands
                  Attention:  President

         If to:   Anergen, Inc.
                  301 Penobscot Drive
                  Seaport Centre
                  Redwood City, California 94063
                  Attention: President

         Either PARTY, from time to time, may change the address to which
         notices are given by sending notice of such change to the other PARTY
         hereto.

21.5     ORGANON agrees to mark and have its AFFILIATES and sublicensees mark
         all PRODUCT sold pursuant to this Agreement in accordance with the
         applicable statute or regulations relating to patent marking in the
         country or countries of manufacture and sale thereof.


                                      -23-
<PAGE>   24
21.6     The PARTIES recognize that this Agreement is a Master Agreement
         covering a number of countries. If, for any country in the TERRITORY,
         it becomes necessary to execute a separate instrument for any such
         country in order to satisfy local law or regulatory requirements, the
         PARTIES agree to execute such further instrument, which shall, to the
         extent permitted by the laws of that country, conform to the terms and
         conditions of this Agreement.

21.7     This Agreement is in the English language, which language shall be
         controlling in all respects, and all versions hereof in any other
         language shall be for accommodation only and shall not be binding upon
         the PARTIES hereto. All communications and notices to be made or given
         pursuant to this Agreement shall be in the English language.

21.8     In the event that any provisions of this Agreement are determined to be
         invalid or unenforceable by a court of competent jurisdiction in any
         jurisdiction, the remainder of the Agreement shall remain in full force
         and effect without said provision in said jurisdiction and such
         determination shall not affect the validity or enforceability of such
         Article or the Agreement in any other jurisdiction. The PARTIES shall
         in good faith negotiate a substitute clause for any provision declared
         invalid or unenforceable,, which shall most nearly approximate the
         intent of the PARTIES in entering this Agreement.

21.9     This Agreement may not be altered, amended or modified in any way
         except by a writing signed by both PARTIES. The failure of a party to
         enforce any provision of the Agreement shall not be construed to be a
         waiver of the right of such PARTY to thereafter enforce that provision
         or any other provision or right.

21.10    NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY SPECIAL,
         CONSEQUENTIAL, INCIDENTAL OR INDIRECT DAMAGES ARISING OUT OF THIS
         Agreement, HOWEVER CAUSED AND UNDER ANY THEORY OF LIABILITY.

21.11    The PARTIES hereto acknowledge that this Agreement and its Exhibits set
         forth the entire agreement and understanding of the PARTIES hereto as
         to the subject matter hereof, and supersedes all prior discussions,
         agreements and writings in respect hereto.

21.12    THIS Agreement may be executed in two (2) counterparts, each of which
         shall be deemed an original but both of which together shall constitute
         one and the same instrument.



                                      -24-
<PAGE>   25
         IN WITNESS WHEREOF, the PARTIES hereto have caused this Agreement to be
duly executed by their duly authorized officers.

ANERGEN, INC.                                 N.V. ORGANON

By:  /s/ JOHN W. VARIAN                       By:  /s/ DRIEK VERGOUWEN
    _____________________________                 _____________________________

Title:  V.P. Finance, C.F.O.                  Title:  Managing Director R&D
       __________________________                    __________________________

Date:   6/28/96                               Date:    6/28/96
      ___________________________                    ___________________________

Exhibit A:  ANERGEN PATENTS [*]
        B:  DEVELOPMENT PROGRAM [*]
        C:  ORGANON PATENTS [*]
        D:  ORIGINAL EPITOPE PEPTIDE SEQUENCE [*]



                                      -25-
<PAGE>   26







                                   EXHIBIT A



                                ANERGEN PATENTS

                                     [ * ]



* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.




<PAGE>   27
                                                                    EXHIBIT B

                              DEVELOPMENT PROGRAM






                                      [*]



* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.




<PAGE>   28


                               EXHIBIT C

                           ORGANON PATENTS

                                 [*]


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   29


                               EXHIBIT D

                   ORIGINAL EPITOPE PEPTIDE SEQUENCE

                                 [*]


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

<PAGE>   1
                                                                   EXHIBIT 10.16

                              EMPLOYMENT AGREEMENT

         THIS AGREEMENT, by and between Barry Sherman, M.D. (the "Employee") and
Anergen, Inc., a California corporation (the "Company"), shall become effective
as of May 27, 1996.

         In consideration of the mutual covenants herein contained, and in
consideration of the employment of Employee by the Company, the parties agree as
follows:

         1.       Duties and Scope of Employment.

                  (a)      Position. The Company agrees to employ the Employee
under the terms of this Agreement in the position of President and Chief
Executive Officer. Employee shall report to the Board of Directors. In addition,
Employee shall be elected to the Board of Directors of the Company as of the
effective date and shall be nominated for re-election at each meeting of the
shareholders where directors are elected during the term of this Agreement.
Employee agrees to resign from the Board of Directors upon termination of
employment with the Company.

                  (b)      Obligations and Duties. During the term of this
Agreement, the Employee shall devote his full business efforts and time to the
Company and shall use his best efforts to promote and protect the business
interests of the Company. Specifically, Employee's responsibilities will be to
manage the operations of the Company; to build and maintain an outstanding and
harmonious working team of both scientific and business employees; to secure,
promote and maintain the appropriate financing and capital structure of the
Company; to manage and direct the strategic development of the Company's
business plan and its implementation; and to oversee the overall scientific
affairs of the Company. The foregoing, however, shall not preclude the Employee
from engaging in appropriate civic, charitable or religious activities or from
devoting a reasonable amount of time to private investments, writing of books,
journals and/or articles, and making public appearances or from serving on the
boards of directors of other entities, as long as such activities and service do
not interfere or conflict with his responsibilities to the Company and do not
represent business conflicts with the Company's business.

                  (c)      Rules, Regulations and Policies. Employee shall
comply with all of the Company's reasonable rules and regulations applicable to
the employees of the Company and with all of the Company's reasonable policies
established by its management and Board of Directors.

         2.       Compensation. Beginning on the effective date of this
Agreement, the Employee shall be paid a base salary (the "Base Compensation") of
$250,000 annually, paid in bi-monthly payments. Employee shall also be eligible
at the end of 12 months to receive a performance bonus of up to 25% of the Base
Compensation at the direction of the Board of Directors. The bonus shall be
determined based upon full or partial completion of reasonable goals established
by mutual agreement between the Employee and the Board of Directors. The
Employee's base salary and bonus shall be reviewed by the Board of Directors for
possible increases annually.
<PAGE>   2
         3.       Employee Benefits.

                  (a)      General. During the term of his employment under this
Agreement, Employee will be entitled to receive all employee benefits currently
and hereafter provided to senior management at the Company including medical,
dental, and life insurance so long as and to the extent these benefits exist,
provided that Employee is otherwise eligible and insurable in accordance to the
terms of such plan(s), and subject in each case to the generally applicable
terms and conditions of the plan or program in question and to the
administrative determinations of any committee or the Board of Directors
administering such plan or program. Employee will be eligible for participation
in the Company's Employee Stock purchase plan on the next enrollment date, which
is October 1, 1996. Employee may participate in the Company's 401(k) plan
beginning on July 1, 1997, which is the next enrollment date after one year from
date of employment. The Board will provide Employee with an equivalent benefit
to offset any loss resulting from unavailability of immediate enrollment in the
plan.

                  (b)      Stock Awards. Through the Company Stock Option Plan,
Employee will be granted options to acquire an aggregate 400,000 shares of
Common Stock of the Company at a price per share on May 14, 1996, the date of
acceptance of employment. These options will vest over a four-year period at the
rate of 6/48th of the shares after 6 months, and 1/48th per share per month
thereafter. The options will be subject to the standard terms and conditions
under the stock option plan.

         4.       Business Expenses and Travel. During the term of his
employment under this Agreement, the Employee shall be authorized to incur
necessary and reasonable travel, entertainment and other business expenses in
connection with his duties hereunder. The Company shall reimburse the Employee
for such expenses upon presentation of an itemized account and appropriate
supporting documentation, all in accordance with the Company's generally
applicable policies.

         5.       Definitions. As used herein, the following definitions shall
apply:

                  (a)      "Cause" shall mean the termination of employment of
Employee shall have taken place as a result of (i) Employee's continued failure
to substantially perform his principal duties (other than as a result of
Disability) after thirty (30) days' written notice from the Company specifying
the nature of Employee's failure and demanding that such failure be remedied;
(ii) Employee's material and continuing breach of his obligations to the Company
set forth in this Agreement or the Proprietary Information Agreement after
thirty (30) days' written notice from the Company specifying the nature of
Employee's breach and demanding that such breach be remedied (unless such breach
by its nature cannot be cured, in which case notice and an opportunity to cure
shall not be required); (iii) Employee's being convicted of a felony or (iv) act
or acts of dishonesty undertaken by Employee and intended to result in
substantial gain or personal enrichment of Employee at the expense of the
Company.

                  (b)      "Change in Control" shall mean the occurrence of any
of the following events:

                                      -2-
<PAGE>   3
                           (i)      The stockholders of the Company approve a
merger or consolidation of the Company with any other corporation or entity,
other than a merger or consolidation which would result in the voting securities
of the Company outstanding immediately prior thereto continuing to represent
(either by remaining outstanding or by being converted into voting securities of
the surviving entity) at least fifty percent (50%) of the total voting power
represented by the voting securities of the Company or such surviving entity or
such surviving entity's parent outstanding immediately after such merger or
consolidation, or the stockholders of the Company approve a plan of complete
liquidation of the Company or an agreement for the sale or disposition by the
Company of all or substantially all the Company's assets, except a sale to an
entity of which at least fifty percent (50%) of the total voting power
represented by the voting securities of such entity are held by stockholders of
the Company at the time of such sale.

                           (ii)     The acquisition by any Person as Beneficial
Owner (as such terms are defined in the Securities Exchange Act of 1934, as
amended), directly or indirectly, of securities of the Company representing
fifty percent (50%) or more of the total voting power represented by the
Company's then outstanding voting securities.

                           (iii)    A majority of the Board of Directors of the
Company in office at the beginning of any thirty-six (36) month period is
replaced during the course of such thirty-six (36) month period (other than by
voluntary resignation of individual directors in the ordinary course of
business) and such replacement was not initiated by the Board of Directors of
the Company as constituted at the beginning of such thirty-six (36) month period
and as changed during such period to add directors approved by the incumbent
Board of Directors.

                  (c)      "Constructive Termination" shall mean (i) a material
reduction in Employee's salary, title, bonus opportunity or benefits not agreed
to by Employee (except in connection with a decrease to be applied because the
Company's performance has decreased and which is also applied to other officers,
and excluding the substitution of substantially equivalent compensation and
benefits), (ii) a significant reduction in Employee's responsibilities not
agreed to by Employee, or (iii) a change in reporting from the Board of
Directors to another officer.

                  (d)      "Disability" shall mean that the Employee, at the
time notice is given, has been unable to perform his duties under this Agreement
for a period of not less than ninety (90) days consecutively as the result of
his incapacity due to physical or mental illness. In the event that the Employee
resumes the performance of substantially all of his duties hereunder before the
termination of his employment under Section 6(b)(iii) becomes effective, the
notice of termination shall automatically be deemed to have been revoked.

         6.       Termination of Employment.

                  (a)      Termination by the Company. The Company may terminate
Employee's employment at any time, for any reason or for no reason, with fifteen
(15) days advance notice in writing.

                                      -3-
<PAGE>   4
                           (i)      Termination Without Cause. If the Company
terminates Employee's employment for any reason whatsoever, including a
Constructive Termination, and other than voluntary termination of Employment or
Termination for Cause, the provisions of Section 7(a) shall apply.

                           (ii)     Termination for Cause. If the Company
terminates Employee's employment for Cause, the provisions of Section 7(b) shall
apply.

                           (iii)    Termination on Death or Disability. If the
Company terminates Employee's employment as a result of Employee's Death or
Disability, the provisions of Section 7(c) shall apply.

                           (iv)     Constructive Termination. If any of the
circumstances which are described in Section 5(c) occur when the Company
terminates Employee's employment, the Employee shall be deemed to be terminated
without Cause and the provisions of Section 7(a) shall apply.

                  (b)      Voluntary Termination by the Employee. The Employee
may terminate his employment voluntarily by giving the Company thirty (30) days'
advance notice in writing, at which time the provisions of Section 7(b) shall
apply. However, if the Employee terminates his employment pursuant to this
Section 6(b) as a result of a Constructive Termination, the provisions of
Section 7(a) shall apply, provided the Employee has provided written notice to
the Company reasonably specifying the reasons why a Constructive Termination has
occurred and the Company has not cured (retroactively where possible) such
Constructive Termination within twenty (20) days after receipt of such notice.

                  (c)      Waiver of Notice. Any waiver of notice shall be valid
only if it is made in writing and expressly refers to the applicable notice
requirement in this Section 6.

         7.       Payments Upon Termination of Employment.

                  (a)      Payments Upon Termination Pursuant to Section 6(a)(i)
and Constructive Termination. If, during the term of this Agreement, the
Employee's employment is terminated by the Company pursuant to Section 6(a)(i)
or voluntarily by Employee under Section 6(b) as a result of a Constructive
Termination, the Employee shall be entitled to receive the following:

                           (i)      Severance Payment. The Company shall
continue to pay to the Employee his Base Compensation and provide medical,
dental and life insurance benefits for twelve (12) months following termination
(the "Severance Payment"). Such Base Compensation amount shall be determined
with reference to the Base Compensation in effect for the month in which the
date of employment termination occurs.

                                      -4-
<PAGE>   5
                           (ii)     Stock Options. The stock options referred to
in Section 3(b) shall be exercisable to the extent that reflects an additional
twelve (12) months of vesting from the date of termination. Employee shall have
six (6) months from the date of termination of employment in which to exercise
any non-qualified stock option and three (3) months from the date of termination
of employment to exercise any incentive stock option.

                           (iii)    Method of Payment. The Severance Payment
shall be made in monthly installments.

                           (iv)     Payment in Lieu of Contract Damages. The
Severance Payment shall be in lieu of any further payments to the Employee and
any further accrual of benefits with respect to periods subsequent to the date
of the employment termination.

                           (v)      No Duty To Mitigate. The Employee shall not
be required to mitigate the amount of any payment contemplated by this Section
7(a) (whether by seeking new employment or in any other manner).

                  (b)      Termination By Company for Cause or Voluntary
Termination. If the Employee's employment is terminated pursuant to Section
6(a)(ii) or voluntarily (other than a Constructive Termination) pursuant to
Section 6(b), no compensation or payments will be paid or provided to the
Employee for the periods following the date when such a termination of
employment is effective. Notwithstanding the preceding sentence, the Employee's
rights under the benefit plans and option agreements of the Company shall be
determined under the provisions of those plans and agreements, provided Employee
shall have six (6) months from the date of termination of employment in which to
exercise any non-qualified stock option and three (3) months from the date of
termination of employment to exercise any incentive stock option in each case to
the extent such options are exercisable as of the date of termination.

                  (c)      Termination on Death or Disability. If the Employee's
employment is terminated because of Employee's Death or Disability (as defined
in Section 3(c) herein), then no payments for the period following such
termination shall be owed under this Agreement and Employee shall receive
severance and disability payments as provided in the Company's standard benefit
plans. Employee's stock options shall be exercisable as provided in the option
agreement.

                  (d)      Termination After a Change in Control. In the event
that after a Change in Control the Employee's employment is terminated pursuant
to Section 6(a)(i) or voluntarily by Employee under Section 6(b) as a result of
a Constructive Termination, then the provisions of Section 7(a) shall apply
except that the accelerated vesting of the exercisability of stock options shall
be twenty-four (24) months instead of twelve (12) months or such longer period
than twenty-four (24) months for which accelerated vesting may be granted
without incurring Federal excise tax imposed pursuant to Section 4996 of the
Internal Revenue Code (or without increasing any such excise tax otherwise
payable without regard to such additional vesting), and provided Employee shall
receive acceleration of less options than twenty-four (24) months if Employee
would receive a greater 

                                      -5-
<PAGE>   6
after tax benefit as a result of any such excise tax than if Employee received
acceleration of the full twenty-four (24) months.

         8.       Proprietary Information. The Employee agrees to comply fully
with the Company's policies relating to non-disclosure of the Company's trade
secrets and proprietary information and processes, as set out in the Proprietary
Information Agreement set out as Exhibit B hereto.

         9.       Non-Competition. For the twelve (12) month period after
termination of this Agreement for any reason, Executive shall not provide
services, whether for compensation or otherwise, as an officer, director,
employee, consultant or in any other capacity to any person or company that
competes with the products, projects or technology which on the date of
termination are actively being pursued by the Company for the diagnosis,
prevention or treatment of disease. In this regard, Executive acknowledges that
this period of time, scope of business and geographic extent are reasonably
necessary to protect the legitimate business interest of the Company. In the
event Executive breaches this Section, Executive agrees that all obligations of
the Company to make the Severance Payment and to accelerate options upon the
termination shall immediately terminate and Executive shall repay any amounts
paid to Executive after the date Executive breached this Section and return any
shares issued upon exercise of any options which were accelerated. The foregoing
shall be the sole remedy for any breach of this provision.

         10.      No Conflicts. Employee covenants that he is not subject to any
agreement or obligation that conflicts with or would be breached by the
provisions of this Agreement.

         11.      Successors.

                  (a)      Company's Successors. The Company shall require in
any agreement through which any successor to the Company (whether directly or
indirectly and whether by purchase, lease, merger, consolidation, liquidation or
otherwise) acquires all or substantially all of the Company's business and/or
assets such successor to assume this Agreement and agree expressly to perform
this Agreement in the same manner and to the same extent as the Company would be
required to perform it in the absence of a succession. For all purposes under
this Agreement, the term "Company" shall include any successor to the Company's
business and/or assets which executes and delivers the assumption agreement
described in this subsection (a) or which becomes bound by this Agreement by
operation of law.

                  (b)      Employee's Successors. This Agreement and all rights
of the Employee hereunder shall inure to the benefit of, and be enforceable by,
the Employee's personal or legal representatives, executors, administrators,
successors, heirs, distributees, devisees and legatees.

         12.      Notice. Notices and all other communications contemplated by
this Agreement shall be in writing and shall be deemed to have been duly given
when personally delivered or five days after being mailed by U.S. registered or
certified mail, return receipt requested and postage prepaid. In the case of the
Employee, mailed notices shall be addressed to him at the home address which he
most recently communicated to the Company in writing. In the case of the
Company, mailed notices shall 

                                      -6-
<PAGE>   7
be addressed to its corporate headquarters, and all notices shall be directed to
the attention of its Chief Executive Officer.

         13.      Termination of Agreement. This Agreement shall terminate upon
the earlier of (i) the date that all obligations of the parties hereunder have
been satisfied or (ii) May __, 2000. A termination of this Agreement pursuant to
the preceding sentence shall be effective for all purposes, except that such
termination shall not affect the payment or provision of compensation or
benefits on account of a termination of employment occurring prior to or upon
the termination of this Agreement. No payments under this Agreement shall be
required for any termination of employment occurring after May __, 2000. The
parties contemplate that at the end of the four year term of this Agreement, the
parties will negotiate a new agreement for a further term of employment. In the
event that a new agreement is not reached between the parties, this Agreement
shall continue to govern the terms of Employee's employment until a new
agreement is entered into.

         14.      Miscellaneous Provisions.

                  (a)      Waiver. No provision of this Agreement shall be
modified, waived or discharged unless the modification, waiver or discharge is
agreed to in writing and signed by the Employee and by the Chief Executive
Officer or a director of the Company authorized by the Board of Directors. No
waiver by either party of any breach of, or of compliance with, any condition or
provision of this Agreement by the other party shall be considered a waiver of
any other condition or provision or of the same condition or provision at
another time.

                  (b)      Whole Agreement. No agreements, representations or
understandings (whether oral or written and whether express or implied) which
are not expressly set forth in this Agreement have been made or entered into by
either party with respect to the subject matter hereof, except for the
Indemnification Agreement and Proprietary Information Agreement between the
Employee and the Company, each of which shall remain in full force and effect
notwithstanding termination of this Agreement. This Agreement shall supersede
the provisions regarding acceleration of vesting after a Change in Control as
defined and provided in any stock options.

                  (c)      Choice of Law. The validity, interpretation,
construction and performance of this Agreement shall be governed by the laws of
the State of California.

                  (d)      Severability. The invalidity or unenforceability of
any provision or provisions of this Agreement shall not affect the validity or
enforceability of any other provision hereof, which shall remain in full force
and effect.

                  (e)      Arbitration. Any dispute or controversy arising under
or in connection with this Agreement shall be settled exclusively by arbitration
in San Mateo County, California, in accor dance with the rules of the American
Arbitration Association then in effect. Judgment may be entered on the
arbitrator's award in any court having jurisdiction.

                                      -7-
<PAGE>   8
                  (f)      No Assignment of Benefits. The rights of any person
to payments or benefits under this Agreement shall not be made subject to option
or assignment, either by voluntary or involuntary assignment or by operation of
law, including (without limitation) bankruptcy, garnishment, attachment or other
creditor's process, and any action in violation of this subsection (f) shall be
void.

                  (g)      Employment At Will; Limitation of Remedies. The
Company and the Employee acknowledge that the Employee's employment is at will,
as defined under applicable law. If the Employee's employment terminates for any
reason, the Employee shall not be entitled to any payments, benefits, damages,
awards or compensation other than as provided by this Agreement.

                  (h)      Employment Taxes. All payments made pursuant to this
Agreement will be subject to withholding of applicable taxes.

                  (i)      Counterparts. This Agreement may be executed in
counterparts, each of which shall be deemed an original, but all of which
together will constitute one and the same instrument.

         IN WITNESS WHEREOF, each of the parties has executed this Agreement, in
the case of the Company by its duly authorized officer, as of the day and year
first above written.

                                           ANERGEN, INC.

/s/ BARRY M. SHERMAN, M.D.                 By: /s/ NICOLE VITULLO
- -----------------------------                 ----------------------------------
Barry M. Sherman, M.D.     
                                           Print Name: Nicole Vitullo
                                                      --------------------------

                                           Title: Director
                                                 -------------------------------

                                       -8-

<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
     We consent to the reference to our firm under the captions "Selected
Financial Data" and "Experts" and to the use of our report dated February 9,
1996, in the Registration Statement (on Form S-1 dated June 28, 1996) and
related Prospectus of Anergen, Inc. for the registration of 4,600,000 shares of
its Common Stock.
 
                                                               ERNST & YOUNG LLP
 
San Francisco, California
June 28, 1996

<PAGE>   1


                                                                Exhibit D

                               Form of Opinion of

                       Townsend and Townsend and Crew LLP

         1. The portions of the Registration Statement and the Prospectus
entitled "Risk Factors -- Uncertainty Relating to Patents and Proprietary
Rights" and "Business --Patents and Proprietary Rights," (together, the "Patent
Paragraphs") are accurate and complete statements or summaries of the matters
set forth therein.

         2. There are no legal or governmental proceedings, other than patent
applications pending, relating to patent rights of the Company, to which the
Company is a party, and, to our knowledge, no such proceedings are threatened or
contemplated by governmental authorities or others and no basis for any such
proceedings exist.

         3. To our knowledge, the Company has not received any communication in
which it is alleged that the Company is infringing or violating patent rights of
third parties.

         4. The Company owns or possesses licenses or other rights to use all
patents, trade secrets, trademarks, service marks or other proprietary
information or materials necessary to conduct the business now being or proposed
to be conducted by the Company as described in the Prospectus.

         5. Although we have not independently verified the accuracy and
completeness of the statements contained in the Registration Statement and the
Prospectus, nothing has come to our attention that would cause us to believe
that, at the time the Registration Statement became effective under the
Securities Act of 1933, as amended, the description and statements in the Patent
Paragraphs of the Registration Statement contained any untrue statement of a
material fact or omitted to state a material fact required to be stated therein
or necessary to make the statements made therein not misleading; or as of the
date of the Prospectus or the date of this opinion, the description and
statements in the Patent Paragraphs of the Prospectus contained or contain any
untrue statement of a material fact or omitted or omit to state a material fact
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not misleading.

         We hereby consent to the reference to our firm under the caption
"Experts" in the Registration Statement.




<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM (A) AUDITED
FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 1995 AND UNAUDITED
FINANCIAL STATEMENTS FOR THE QUARTER ENDED MARCH 31, 1996 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH (B) REGISTRATION STATEMENT ON FORM S-1.
</LEGEND>


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<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1995             MAR-31-1996
<PERIOD-START>                             JAN-01-1995             JAN-01-1996
<PERIOD-END>                               DEC-31-1995             MAR-31-1996
<CASH>                                             468                     310
<SECURITIES>                                     11024                    9343
<RECEIVABLES>                                      815                     783
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                 12409                   10539
<PP&E>                                            5428                    5572
<DEPRECIATION>                                    3418                    3686
<TOTAL-ASSETS>                                   14455                   12461
<CURRENT-LIABILITIES>                             1040                     889
<BONDS>                                           1701                    1382
                                0                       0
                                          0                       0
<COMMON>                                         47359                   47400
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