AMERICAN BIOGENETIC SCIENCES INC
S-3/A, 1996-12-23
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 23, 1996

                                                      Registration No. 333-14447
    
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

   
                                 AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933
    


                       AMERICAN BIOGENETIC SCIENCES, INC.
             (Exact name of registrant as specified in its charter)

            Delaware                                             11-2655906
(State or other jurisdiction of                               (I.R.S. Employer
incorporation or organization)                               Identification No.)

                                1375 Akron Street
                             Copiague New York 11726
                                 (516) 789-2600
          (Address, including zip code, and telephone number, including
             area code, of registrant's principal executive offices)
                                ----------------

                           Timothy J. Roach, Treasurer
                       American Biogenetic Sciences, Inc.
                                1375 Akron Street
                            Copiague, New York 11726
                                 (516) 789-2600
                (Name, address, including zip code, and telephone
               number, including area code, of agent for service)

                                    Copy to:

                             Richard A. Rubin, Esq.
                       Parker Chapin Flattau & Klimpl, LLP
                           1211 Avenue of the Americas
                            New York, New York 10036
                               ------------------

           APPROXIMATE  DATE OF  COMMENCEMENT  OF PROPOSED SALE TO PUBLIC:  From
time to time after the effective date of this Registration Statement.

           If the only  securities  being  registered  on this  Form  are  being
offered pursuant to dividend or interest  reinvestment  plans,  please check the
following box.  [_]

           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,  other than  securities  offered only in connection with
dividend or interest reinvestment plans, check the following box:  [X]

           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.  [_]

                      (facing page continued on next page)



<PAGE>




           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.  [_]



       
           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 SAID SECTION 8(A),
MAY DETERMINE.












<PAGE>
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, DATED DECEMBER 23, 1996
    


PROSPECTUS
- --------------------------------------------------------------------------------

                                3,068,118 Shares

                       AMERICAN BIOGENETIC SCIENCES, INC.

                              Class A Common Stock

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

   
           This  Prospectus  relates to an aggregate  of  3,068,118  shares (the
"Shares") of Class A Common  Stock,  $.001 par value per share  ("Class A Common
Stock"),  of American  Biogenetic  Sciences,  Inc. (the "Company")  which may be
offered and sold from time to time,  by the Selling  Stockholders  named  herein
(the "Selling Stockholders"),  consisting of a maximum of 3,052,500 Shares which
may be issued upon conversion of $9,000,000  principal  amount of 7% Convertible
Debentures  due September 30, 1998,  sold by the Company in a private  placement
(the  "Debentures")  and 15,618  shares that may be issued upon the  exercise of
Warrants  exercisable at an exercise price of $5.7625 per share until  September
30, 1998 (the  "Warrants")  which were issued by the Company to designees of the
placement agent for the Debentures. See "Selling Stockholders".

           The Shares may be offered  for sale from time to time by the  Selling
Stockholders  or their  pledgees,  donees,  transferees  or other  successors in
interest, in the over-the-counter  market, in privately negotiated  transactions
or otherwise, at market prices prevailing at the time of sale, at prices related
to such prevailing market prices or at negotiated prices. The Shares may be sold
directly by the Selling Stockholders or through one or more broker-dealers. Such
broker-dealers may receive compensation in the form of commissions, discounts or
concessions from the Selling  Stockholders  and/or purchasers of Shares for whom
such broker-dealers may act as agent, or to whom they may sell as principal,  or
both (which  compensation as to a particular  broker-dealer  may be in excess of
customary commissions).  The Selling Stockholders and such broker-dealers may be
deemed to be "underwriters" within the meaning of the Securities Act of 1933, as
amended (the "Securities  Act"), and any discounts,  commissions and concessions
and  any  profits  realized  on any  sale  of the  Shares  may be  deemed  to be
underwriting   compensation.   See   "Selling   Stockholders"   and   "Plan   of
Distribution".
    

           AN INVESTMENT IN THE SHARES OFFERED HEREBY  INVOLVES A HIGH DEGREE OF
RISK. SEE "RISK FACTORS" BEGINNING ON PAGE 3 FOR A DISCUSSION OF CERTAIN FACTORS
THAT SHOULD BE CONSIDERED BY PROSPECTIVE INVESTORS.

   
           The  Class A Common  Stock is  quoted on The  Nasdaq  Stock  Market's
National  Market System  ("Nasdaq/NMS")  under the symbol MABXA. On December 20,
1996,  the closing price of the Class A Common Stock on Nasdaq/NMS was $4.25 per
share.
    

    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.

   
                 The date of this Prospectus is December , 1996
    
<PAGE>

                              AVAILABLE 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, proxy statements and other information with
the Securities and Exchange Commission (the "Commission").  Such reports,  proxy
statements  and other  information  filed by the  Company can be  inspected  and
copied at the public reference  facilities  maintained by the Commission at Room
1024,  Judiciary Plaza, 450 Fifth Street, N.W.,  Washington,  D.C. 20549, and at
the Commission's  Regional Offices located at 7 World Trade Center,  13th Floor,
New York, New York 10048 and Citicorp  Center,  500 West Madison  Street,  Suite
1400, Chicago, Illinois 60661-2511. Copies of such material can also be obtained
at  prescribed  rates  from the  Public  Reference  Section  of the  Commission,
Judiciary Plaza, 450 Fifth Street, N.W., Washington,  D.C. 20549. The Commission
maintains  a Web site  (http://www.sec.gov)  that  contains  reports,  proxy and
information  statements and other information  electronically  filed through the
Commission's Electronic Data Gathering, Analysis and Retrieval system ("EDGAR").
The Common Stock is currently quoted on The Nasdaq Stock Market and such reports
and other information can also be inspected at the offices of Nasdaq Operations,
1735 K Street, N.W., Washington, D.C. 20006.

   
           The Company has filed with the Commission,  Washington, D.C. 20549, a
Registration  Statement (No. 333-14447) under the Securities Act with respect to
the Shares (the  "Registration  Statement").  As  permitted  by the rules of the
Commission, this Prospectus does not contain all of the information set forth in
the Registration  Statement and the exhibits and schedules thereto.  For further
information with respect to the Company and the Shares offered hereby, reference
is made to the  Registration  Statement  and the  exhibits and  schedules  filed
therewith.  Statements  contained  in  this  Prospectus,  and  in  any  document
incorporated  herein by  reference,  as to the  contents of any  contract or any
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 or such  document,  each such  statement
being  qualified in all respects by such reference.  A copy of the  Registration
Statement may be inspected without charge at the Commission's  principal office,
Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington,  D.C. 20549, and
copies of all or any part of the  Registration  Statement  may be obtained  from
such office  upon the  payment of the fees  prescribed  by the  Commission.  The
Registration  Statement has been filed  through EDGAR and is publicly  available
through the Commission's Web site (http://www.sec.gov).
    

                      INFORMATION INCORPORATED BY REFERENCE

   
           The  following  documents  heretofore  filed by the Company  with the
Commission (File No. 0-19041)  pursuant to Section 13(a) of the Exchange Act are
incorporated  herein by reference:  (i) the Company's Annual Report on Form 10-K
for the year ended December 31, 1995,  (ii) the Company's  Quarterly  Reports on
Form 10-Q  for the quarters  ended March 31, 1996 une 30, 1996 and September 30,
1996,  (iii) the  Company's  Current  Report on Form 8-K dated (date of earliest
event  reported)  September 30, 1996 and (iv) the  description  of the Company's
Class A Common Stock contained in the  Registration  Statement on Form 8-A filed
by the Company on February 26, 1991, including any amendment or report filed for
the purpose of updating such  description.  Each  document  filed by the Company
pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to
the date of this  Prospectus but prior to the termination of this offering shall
be deemed to be  incorporated  by reference into this  Prospectus and to be part
hereof from the date of the filing of such document.  Any statement contained in
this  Prospectus or in a document  incorporated  or deemed to be incorporated by
reference  herein,  shall be deemed to be modified or superseded for purposes of
this Prospectus to the extent that a statement  contained herein or in any other
subsequently  filed  document which also is or is deemed to be  incorporated  by
reference  herein  modifies or  supersedes  such  statement.  Any  statement  so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Prospectus.
    

           THE COMPANY WILL PROVIDE,  WITHOUT  CHARGE TO EACH PERSON  (INCLUDING
ANY BENEFICIAL  OWNER) TO WHOM A COPY OF THIS PROSPECTUS IS DELIVERED,  UPON THE
WRITTEN OR ORAL REQUEST OF ANY SUCH PERSON, A COPY OF ANY DOCUMENT  INCORPORATED
BY REFERENCE IN THIS  PROSPECTUS  (OTHER THAN EXHIBITS  UNLESS SUCH EXHIBITS ARE
EXPRESSLY  INCORPORATED  BY REFERENCE  IN SUCH  DOCUMENTS).  REQUESTS  SHOULD BE
DIRECTED TO AMERICAN BIOGENETIC SCIENCES, INC., 1375 AKRON STREET, COPIAGUE, NEW
YORK 11726 (516) 789-2600, ATTENTION: JOSEF C. SCHOELL, VICE PRESIDENT, FINANCE.

                                       -2-
<PAGE>




                                   THE COMPANY

           American  Biogenetic  Sciences,  Inc. is engaged in the  research and
development  of   cardiovascular   and  neurobiology   products  for  commercial
development.  The Company's enabling technology is a patented antigen-free mouse
colony which allows the generation of highly specific monoclonal antibodies that
are difficult to obtain from conventional systems. The Company has utilized this
technology  to  supply  antibodies  for  its  innovative  in  vitro  and in vivo
diagnostic products.

           Over the  last  few  years  the  Company  has  directed  its  efforts
primarily toward the development of  cardiovascular  and neurobiology  products,
which has led to the  development of the Company's  Thrombus  Precursor  Protein
(TpP(TM)) test, an assay for the detection of active  thrombosis  (blood clots),
and Functional Intact  Fibrinogen  (FiF(TM)) test, an assay to measure levels of
fibrinogen  in blood,  as well as the  Company's  patented  specific  monoclonal
antibody MH1, with radioisotope, for use as an in vivo imaging agent.

           The Company was  incorporated  in Delaware on September 1, 1983.  The
Company's  principal  executive  offices  are  located  at  1375  Akron  Street,
Copiague,  New York 11726,  and its  telephone  number at that  address is (516)
789-2600.


                                  RISK FACTORS

An  investment  in the  securities  offered  hereby is  speculative  in  nature,
involves a high degree of risk and should not be made by any investor who cannot
afford the loss of his entire  investment.  In  evaluating  an investment in the
Company,  prospective  investors  should  carefully  consider the following risk
factors  in  addition  to  the  other  information  included  herein  and in the
information  incorporated and deemed to be incorporated herein by reference (see
"Information Incorporated by Reference",  above). Certain statements included in
this Prospectus (and the information  incorporated and deemed to be incorporated
herein  by  reference)   concerning  the  Company's   future   results,   future
performance,  intentions, objectives, plans and expectations are forward-looking
statements.  Those statements are subject to a number of known and unknown risks
and uncertainties that, in addition to general economic and business conditions,
could cause actual results,  performance  and  achievement to differ  materially
from those described or implied in the forward-looking statements.  Factors that
could cause or contribute to such differences  include,  but are not limited to,
those discussed below.

   
           DEVELOPMENT STAGE COMPANY;  HISTORY OF LOSSES;  ACCUMULATED  DEFICIT.
The  Company  commenced  operations  more than ten years ago and  remains in the
development  stage as it has not yet generated any revenues from product  sales,
although the Company has received an aggregate of $1,273,000  through  September
30, 1996 in licensing fees under collaborative agreements since inception. While
the  Company  has  products at various  stages of  development,  there can be no
assurance  as to when the Company may begin  generating  revenues  from  product
sales and cease  being a  development  stage  company.  The  development  of the
Company's  products  has  required,  and is  expected  to  continue  to require,
significant  research and development,  preclinical testing and clinical trials,
as well as regulatory approvals.  These activities,  together with the Company's
general and administrative expenses, have resulted in significant losses and are
expected to continue to result in significant losses for the foreseeable future.
At  September  30,  1996,  the  Company  had net  worth  of  $6,551,000,  but an
accumulated  retained earnings deficit of $39,142,000.  The Company's ability to
achieve  profitability  is dependent,  in part,  on its ability to  successfully
complete its existing products and products under  development,  obtain required
regulatory  approvals  and  manufacture  and market  such  products  directly or
through  partners.  Due to the time  before  the  Company  expects to be able to
manufacture and commercially market its existing and under development products,
the Company expects to incur operating  losses for the foreseeable  future.  The
Company's   operations  are  subject  to  numerous  risks  associated  with  the
development of pharmaceutical products, including the competitive and regulatory
environment  in which  the  Company  operates.  In  addition,  the  Company  may
encounter   unanticipated   problems,   including  development,   manufacturing,
distribution  and  marketing  difficulties,  some of  which  may be  beyond  the
Company's financial and technical abilities to resolve.
    


                                       -3-

<PAGE>

Accordingly,  there  can be no  assurance  that the  Company's  existing,  under
development or proposed  products will prove to be commercially  viable, or that
the  Company  will  successfully  market any  products  or  achieve  significant
revenues or profitable operations.

   
           NEED FOR ADDITIONAL FINANCING. At September 30, 1996, the Company had
working   capital  of   $15,286,000.   However,   the   research,   development,
commercialization,  manufacturing and marketing of the Company's existing, under
development  and  proposed  products  is likely to require  financial  resources
significantly   in  excess  of  those   presently   available  to  the  Company.
Accordingly,  the Company intends to seek additional financing (which may result
in  borrowings  that could affect its results of  operations  or the issuance of
additional  shares of the  Company's  capital  stock  and/or  rights to  acquire
additional  shares of capital stock that could cause a dilution of the interests
of then existing stockholders in the Company).  The Company also intends to seek
collaborative,   licensing,   co-marketing  or  other  arrangements  with  large
pharmaceutical  companies or other third parties to provide  additional  funding
and  clinical   expertise  to  perform  tests  necessary  to  obtain  regulatory
approvals,  provide  manufacturing  expertise and market the Company's products,
which may result in the Company  sharing the benefits of its products  with such
third parties as well as sharing with, or relying upon, the management of others
for the development, testing and/or marketing of its products.
    

           There can be no  assurance  that the Company  will be able to arrange
financing,  collaborative  arrangements  or other  third party  arrangements  on
acceptable  terms  necessary  to  fully  develop  and  commercialize  any of its
products. If the Company is unable to enter into such arrangements or obtain the
substantial  financing  necessary  on  acceptable  terms,  it would be unable to
complete development of or commercialize its products.

           UNPROVEN PRODUCTS. The Company's existing products and products under
development are in the developmental stage and are subject to the risks inherent
in the development of products based upon biotechnology.  These products require
further  research,  development,  testing and regulatory  clearance.  All of the
Company's products will require  demonstration of commercial scale manufacturing
before any can be proven to be  commercially  viable.  The  Company is unable to
predict with any degree of certainty  when,  or if, the  research,  development,
testing  and  regulatory  approval  process  for  any of its  products  will  be
completed.  There can be no assurance that the Company's  technology will result
in any product  meeting  applicable  regulatory  standards,  be capable of being
produced in  commercial  quantities at  reasonable  costs,  be acceptable to the
medical  community,  or be successfully  marketed.  Accordingly,  the Company is
unable to predict whether its technology will result in any commercially  viable
product.

   
           CERTAIN  EFFECTS  OF  GOVERNMENT   REGULATION.   The   investigation,
manufacture,  exportation  and sale of diagnostic and  therapeutic  products and
vaccines in or from the United  States is subject to  regulation by the Food and
Drug  Administration  (the  "FDA"),  including  review  and/or  approval  before
marketing,  as well as by comparable  foreign and state agencies.  Some in vitro
diagnostic  products  are  eligible for an  accelerated  application  process in
accordance  with Section  510(k) of the 1976 Medical  Device  Amendments  to the
Federal Food, Drug and Cosmetic Act as a product  "substantially  equivalent" to
another  product in commercial  distribution in the United States before May 28,
1976. In October 1996, the Company received Section 510(k) regulatory  clearance
for its microtiter plate format in vitro TpP diagnostic test and intends to seek
such clearance as to a microtiter plate format of its FiF diagnostic test. There
can be no assurance that the microtiter plate format of its FiF diagnostic test,
or other in vitro diagnostic test products that the Company may develop, will be
eligible  to use the Section  510(k)  procedure.  Therefore,  the Company may be
required to utilize  other  regulatory  approval  processes  which may result in
higher costs and require more extensive time in bringing products to market. The
Company is proceeding with the development of its in vitro products  through use
of its resources and through arrangements with contractors and consultants.  The
cost of obtaining FDA approval for in vivo products (such as is required for the
Company's patented specific  monoclonal antibody MH1 obtained from the Company's
antigen free mouse  colony) is far more  expensive and time  consuming  than the
costs  associated with the review of products for in vitro use.  Therefore,  the
Company intends to seek joint ventures or licensing arrangements with respect to
its existing MH1 imaging product and other proposed in vivo products under which
the costs associated with the regulatory  review and/or approval process will be
borne by, or  shared  with,  the joint  venturer  or  licensee.  There can be no
assurance that the Company will be able to enter into any
    

                                       -4-
<PAGE>

   
such arrangements  nor, if it is able to, the terms thereof.  Also, there can be
no assurance that regulatory review and/or approval will be obtained for its FiF
and MH1 imaging products or for any additional products the Company may develop.
Even if regulatory  review  and/or  approval is obtained  initially,  a marketed
product is subject to continual  FDA review,  and the  discovery  of  previously
unknown  problems  may result in  restrictions  on a product's  marketing or the
withdrawal of approval to market the product.
    

           DEPENDENCE ON ACCEPTANCE BY MEDICAL COMMUNITY.  Sales on a commercial
basis of the Company's  products for use as diagnostics or therapeutics  will be
substantially  dependent  on  acceptance  by the medical  community.  Widespread
acceptance of the  Company's in vitro  diagnostic  tests as a useful  adjunct to
diagnosis and treatment will require  educating the medical  community as to the
benefits and  reliability of such products.  Similarly,  the use of any products
for in vivo diagnosis  (including those utilizing mouse  antibodies) and therapy
will require educating the medical community as to their benefits,  reliability,
safety and  effectiveness.  There can be no assurance  that any of the Company's
products will be accepted in the medical community, and the Company is unable to
estimate  whether it will be able to, and if so the length of time it would take
to, gain such acceptance.

           MARKETING ARRANGEMENTS OR SALES PERSONNEL.  During the fourth quarter
of 1995, the Company entered into a license and  collaboration  agreement with a
large  pharmaceutical  company to co-develop  and market the Company's TpP assay
and to market  its TpP test in latex  based  particle  agglutination  format and
entered  into  another  license  agreement  with a second  large  pharmaceutical
company for marketing  another format of the TpP assay.  The Company  intends to
seek arrangements with other large pharmaceutical companies to market these, its
FiF, under development and proposed in vitro products.  In the event the Company
is unable to enter into other  arrangements or if the arrangements  which it has
entered  into or may enter into in the future are not  successful,  the  Company
would likely seek to market such products through independent distributors which
would require the Company to develop a marketing  program to support  sales.  In
such event,  the Company  would be  required,  among  other  things,  to pay the
expenses  of  developing   promotional   literature  and  aides,   hiring  sales
representatives  and completing studies to interest  distributors in selling the
Company's in vitro  diagnostic  tests.  Any  independent  distributors  that the
Company may use would in all likelihood also market competitive products.  There
can be no assurance that the Company will be able to enter into arrangements for
the  distribution  of any in vitro products on satisfactory  terms.  Any in vivo
products  will  require  the  marketing  and  sales   organization  of  a  large
pharmaceutical  company to establish them in the  marketplace.  In the event the
Company were unable to enter into satisfactory marketing arrangements,  it would
be unable to commercially market any in vivo products.

           MANUFACTURING FACILITIES.  While the Company is presently producing a
limited  quantity of monoclonal  antibodies for testing and evaluation of its in
vitro  products,  there can be no  assurances  that the Company  will be able to
either  finance  or meet  FDA  regulations  for  good  manufacturing  procedures
required in order to convert and operate such facility for commercial production
of such products. The Company does not intend to establish its own manufacturing
operations  for its in  vivo  products  unless  and  until,  in the  opinion  of
management of the Company,  the size and scope of its business and its financial
resources so warrant.  The Company has entered  into an agreement  under which a
third  party is to  manufacture  the  Company's  in vivo  diagnostic  monoclonal
antibody  for use in clinical  testing.  It is the  Company's  intention to seek
additional third parties to manufacture its in vivo monoclonal antibody or enter
into a joint venture or license agreement with a partner who will be responsible
for future  manufacturing.  Each joint venture partner or contract  manufacturer
participating in the manufacturing  process of the Company's monoclonal antibody
must comply with FDA regulations and file  documentation with the FDA to support
that part of the  manufacturing  process  in which it is  involved.  There is no
assurance that third parties will be able to manufacture  sufficient  quantities
of the  Company's  in vivo  monoclonal  antibody  necessary  to obtain  full FDA
clearance, that the FDA will accept the Company's manufacturing arrangements, or
that these commercial  manufacturing  arrangements can be obtained on acceptable
terms.

           PATENTS AND  PROTECTION  OF  PROPRIETARY  INFORMATION.  The Company's
policy is to seek patent protection for its products and products resulting from
any  development  and licensing  arrangements  into which the Company may enter.
Such patents generally  require one to five years before issuance.  There can be
no
                                       -5-
<PAGE>


assurance that any pending or future patent  applications will issue as patents.
If patents do not issue from present or future patent applications,  the Company
may be subject to greater competition. Moreover, other technology which does not
infringe  upon the  Company's  technology  could be  independently  developed by
others  who would then be free to use the  technology  in  competition  with the
Company.  Also,  there can be no  assurance  that any of the  patents  which the
Company  has  obtained  or which may be issued in the future  will  provide  the
Company with significant competitive advantages,  or that challenges will not be
instituted  against the  validity or  enforceability  of any such patents or, if
instituted,  that such challenges will not be successful. The cost of litigation
to uphold the validity of a patent and prevent  infringement  can be substantial
even if the Company were to prevail. Furthermore, there can be no assurance that
others  have  not  independently   developed,  or  will  not  develop,   similar
technologies  and  products  or  will  not  develop   distinctively   patentable
technology  duplicating  the Company's  technology or design around the patented
aspect of the Company's  technologies  and products or that the Company will not
infringe  patents or other rights owned by others,  licenses to which may not be
available to the Company or, if available,  may not be available on commercially
reasonable terms.

           In  certain  cases,  the  Company  may  rely  on  trade  secrets  and
contractual confidentiality agreements with consultants, employees and others to
protect any proprietary  technology that it develops.  There can be no assurance
that trade  secrets  will be  developed,  or that  secrecy  obligations  will be
honored,  or that  others  will not  independently  develop  similar or superior
technology.  The  Company's  scientific  advisors  may be  employed  by or  have
agreements with third parties and any inventions  discovered by such individuals
may not necessarily become the property of the Company.

           COMPETITION;  RAPID TECHNOLOGICAL CHANGES. Many companies,  including
large  pharmaceutical,   chemical,   biotechnology  and  agricultural  concerns,
universities  and other  research  institutions,  with  financial  resources and
research and development staffs and facilities  substantially greater than those
of the  Company,  as well  as a  number  of  small  companies,  are  engaged  in
researching  and  developing  products  which  are  or  may be  similar  to,  or
competitive  with,  the  Company's  existing,  under  development  and  proposed
products.

           Other  products  now in  use,  presently  undergoing  the  regulatory
approval  process,  or under development by others may perform similar functions
as the Company's existing, under development and proposed products. The industry
is characterized by rapid  technological  advances,  and competitors may develop
products which may render the Company's existing, under development and proposed
products obsolete or which have advantages over the Company's products,  such as
greater accuracy and precision or greater  acceptance by the medical  community.
In addition, competitors may be able to complete the regulatory approval process
sooner and, therefore, market their products earlier than the Company.

   
           RETENTION AND ATTRACTION OF KEY PERSONNEL. The success of the Company
may be  dependent  on the efforts of Alfred J.  Roach,  Chairman of the Board of
Directors,  Chief Executive  Officer and a major  stockholder of the Company and
Dr. Paul E. Gargan,  President,  Chief Scientific  Officer and a Director of the
Company. Only Dr. Gargan is a party to an employment agreement with the Company.
The loss of the services of Mr. Roach or Dr.  Gargan , as well as certain  other
personnel, could adversely affect the Company's business and prospects.
    

           Because  of the  nature of its  business,  the  Company's  success is
dependent  upon its  ability to attract  and  retain  technologically  qualified
personnel,  particularly research scientists.  There is substantial  competition
for qualified personnel, including competition from companies with substantially
greater resources than the Company.  There is no assurance that the Company will
be successful in recruiting or retaining  personnel of the requisite  caliber or
in  adequate  numbers to enable it to conduct its  business,  and it may be time
consuming and costly to recruit qualified personnel.

           The Company's scientific advisors are employed by or work for others,
and they are  expected  to  devote  only a small  portion  of their  time to the
Company.  In addition,  these  individuals have employment,  consulting or other
advisory arrangements with other entities and, as a result, their obligations to
these other  entities  may  conflict or compete  with their  obligations  to the
Company.

                                       -6-

<PAGE>

           PRODUCT  LIABILITY;  ABSENCE  OF  INSURANCE  COVERAGE.  The  testing,
marketing  and  sale  of  pharmaceutical  products  entails  a risk  of  product
liability claims by consumers and others. Additionally, the Company's monoclonal
antibodies  are generated from an antigen free mouse colony and instances of the
human immune system  negatively  reacting to mouse derived  antibodies have been
reported by others.  Product  liability  claims may be  asserted by  physicians,
laboratories,  hospitals or patients  relying upon the results of the  Company's
diagnostic  tests.  Claims may also be asserted against the Company by end users
of the Company's products, including persons who may be treated with any in vivo
diagnostic or therapeutics.

           Certain  distributors  of  pharmaceutical  products  require  minimum
product liability  insurance coverage as a condition  precedent to purchasing or
accepting   products  for  distribution.   Failure  to  satisfy  such  insurance
requirements   could  impede  the  ability  of  the  Company  to  achieve  broad
distribution  of products,  which would have a material  adverse effect upon the
business and financial condition of the Company.

           The Company does not maintain product  liability  insurance  coverage
and,  although the Company will attempt to obtain  product  liability  insurance
prior to the marketing of its existing or under development  products,  there is
no  assurance  that the  Company  will be able to obtain such  insurance  or, if
obtained,  that such  insurance can be acquired at a reasonable  cost or will be
sufficient to cover all possible liabilities.  In the event of a successful suit
against the Company,  lack or insufficiency  of insurance  coverage could have a
material adverse effect on the Company.

   
           CONTROL BY ALFRED J. ROACH. As at November 30, 1996, Alfred J. Roach,
Chairman of the Company's  Board of  Directors,  owned and had the power to vote
all  1,375,500  outstanding  shares of the  Company's  Class B Common  Stock and
513,250  shares of the  Company's  Class A Common  Stock  (and held  immediately
exercisable options to purchase an additional  1,126,250 shares of the Company's
Class A Common  Stock).  Each share of Class B Stock is  entitled  to ten votes,
while each share of Class A Common  Stock is entitled to one vote.  Accordingly,
at such date,  Mr. Roach was entitled to cast  approximately  47.5% of all votes
entitled to be cast by stockholders at meetings or by consent without a meeting.

           POTENTIAL  ISSUANCES OF SHARES.  In addition to the 16,270,994 shares
of Class A Common  Stock  outstanding  on  November  30,  1996,  the Company had
10,275,508  shares of Class A Common  Stock  reserved  for  future  issuance  as
follows: (i) the 3,052,500 Shares being offered hereby, representing the maximum
number of shares issuable upon conversion of the Debentures  (including interest
for  one  calendar  quarter  since  any  accrued  but  unpaid  interest  is also
convertible  into Common Stock),  were reserved for issuance upon  conversion of
the  Debentures  which are  convertible  to the  extent of 25% of the  principal
amount thereof commencing on the effective date of the Registration Statement of
which this Prospectus  forms a part, and on each of the 30th, 60th and 90th days
thereafter, at a conversion price equal to 83% of the average closing bid prices
of the  Company's  Class A Common  Stock for the five  consecutive  trading days
ending on the trading day immediately prior to the conversion date, subject to a
minimum conversion price of $3.00 per share (the "Minimum Conversion Price") and
a maximum  conversion price of $8.00 per share,  provided that if the conversion
price would  otherwise be less than $3.00 per share,  the  Debentureholder  will
also be  entitled  to  receive an amount of cash  equal to the  decrease  in the
number of shares  issued as a result of such  limit  multiplied  by such  market
price of the Company's  Class A Common  Stock,  (ii) 15,618 shares were reserved
for issuance upon exercise of the Warrants, which are exercisable at an exercise
price of $5.7625 per share at any time until September 30, 1998, (iii) 1,375,500
shares were reserved for issuance upon  conversion of the Company's  outstanding
shares of Class B Common Stock, (iv) 2,982,000 shares were reserved for issuance
upon the exercise of  outstanding  options under the Company's 1986 Stock Option
Plan  (which  plan has  expired as to the  future  grant of  options)  at prices
ranging from $1.50 to $10.00 per share,  (v) 1,000,000  shares were reserved for
issuance  upon the  exercise  of options  granted or which may be granted in the
future  under the  Company's  1996 Stock  Option  Plan,  under which  options to
purchase  155,000 shares,  at exercise prices ranging from of $4.78 to $5.63 per
share, were outstanding, (vi) 487,500 shares were reserved for issuance upon the
exercise  of options  granted  or which may be  granted in the future  under the
Company's 1993  Non-Employee  Director Stock Option Plan, under which options to
purchase  80,000 shares at exercise prices ranging from $2.75 to $6.75 per share
were  outstanding,  (vii) a minimum of 580,909 shares were reserved for issuance
upon conversion of the $1,800,000 principal amount of the Company's 8%
    

                                       -7-
<PAGE>



   
Convertible  Debentures due October 13, 1998, which were outstanding on November
30, 1996 and convertible  (with accrued interest from the date of issuance) at a
price equal to the lesser of $3.375 or 85% of the  average  closing bid price of
the  Company's  Class A Common  Stock  for the five  trading  days  prior to the
conversion  date,  and (viii) 781,481 shares were reserved for issuance upon the
exercise  of warrants  and  options  issued to  unaffiliated  third  parties (at
exercise prices ranging from $2.25 to $6.75 per share). The issuance of reserved
shares would dilute the equity interest of existing  stockholders and could have
a significant adverse effect on the market price of the Company's Class A Common
Stock. See also "--Shares Eligible for Future Sale", below.
    

           NO  DIVIDENDS.  The  holders of Class A and Class B Common  Stock are
entitled to receive dividends when, as and if declared by the Board of Directors
out of funds legally available  therefor.  To date, the Company has not paid any
cash  dividends.  The payment of dividends,  if any, in the future is within the
discretion  of the  Board of  Directors  and  will  depend  upon  the  Company's
earnings,  its capital requirements and financial condition,  and other relevant
factors.  The Board does not intend to declare any dividends in the  foreseeable
future,  but  instead  intends to retain all  earnings,  if any,  for use in the
Company's  business  operations.  As the  Company  will be  required  to  obtain
additional  financing,  it is likely  that  there  will be  restrictions  on the
Company's ability to declare any dividends.

   
           SHARES  ELIGIBLE FOR FUTURE SALE.  At November 30, 1996,  the Company
had outstanding  16,270,994  shares of Class A Common Stock and 1,375,500 shares
of Class B Common  Stock (which are  convertible  into Class A Common Stock on a
share  for  share  basis).  Of  such  shares,  approximately  15,671,544  shares
(including  5,000 shares  subject to another  registration  statement  under the
Securities  Act) of Class A  Common  Stock  are  presently  freely  transferable
without restriction under the Securities Act.

           The remaining  1,974,950  outstanding shares (including the 1,375,500
shares of Class A Common Stock issuable upon conversion of Class B Common Stock)
are held by persons who may be deemed to be  "affiliates" of the Company and are
presently  eligible for sale under Rule 144 promulgated by the Commission  under
the Securities Act ("Rule 144"). Rule 144 provides, in general, that all persons
(including affiliates) who have satisfied a two year holding period with respect
to  "restricted  securities",  as well as  affiliates  with respect to all other
securities  held by them, may,  subject to fulfillment of certain  requirements,
sell  within any three month  period a number of shares of Class A Common  Stock
which does not exceed the greater of 1% of the then outstanding  shares of Class
A Common  Stock or the average  weekly  trading  volume in Class A Common  Stock
during the four calendar weeks prior to such sale. Rule 144 also permits,  under
certain circumstances,  the sale of "restricted securities" without any quantity
or other  limitation by a person who is not an affiliate of the Company (and has
not been an affiliate for at least three months  preceding the sale) and who has
satisfied a three year holding period. "Affiliates" are persons who control, are
controlled by or are under common control with the Company.

           Upon issuance of the  3,068,118  Shares  covered by this  Prospectus,
such  Shares  will also be freely  transferable  without  restriction  under the
Securities  Act  subject to  applicable  Prospectus  delivery  requirements.  In
addition, all 580,909 shares that may be issued upon conversion of the Company's
8% Convertible  Debentures are likely to be tradeable  without  restriction upon
such conversion,  and all shares issuable upon the exercise of options under the
Company's  stock  option  plans  have  been  registered  for  issuance  with the
Securities Act and, unless held by "affiliates" of the Company (who will be able
to sell such shares by complying with Rule 144, discussed above, but without any
additional holding period), will be freely tradeable upon issuance. Furthermore,
the Company has caused to be registered  under the Securities Act for resale (i)
100,000  shares of Class A Common  Stock  subject  to  options  held by a former
consultant, (ii) 5,000 shares of Class A Common Stock issued
    

                                       -8-

<PAGE>


in June 1996 and 25,000 shares of Class A Common Stock subject to an option held
by a former  consultant and (iii) 350,000 shares of Class A Common Stock subject
to  warrants  held by the  underwriter  of a public  offering  conducted  by the
Company,  all of  which,  if  sold,  will  be  freely  transferable  subject  to
applicable  Prospectus  delivery  requirements.  See  "--Potential  Issuances of
Shares", above.

           Any sale of a substantial number of the foregoing shares could have a
significant  adverse effect on the market price of the Company's  Class A Common
Stock.

   
           NO ASSURANCE OF CONTINUED NASDAQ/NMS LISTING. The Company is required
to comply with  numerous  rules  promulgated  by Nasdaq in order for its Class A
Common Stock to continue to be listed thereon.  Among other things,  the Company
is required to maintain an adjusted  tangible  net worth of at least  $4,000,000
(to be reduced if the Company attains profitability for specified periods),  and
its Class A Common Stock is to have an aggregate  market value of shares held by
persons  other  than  officers  and  directors  ("public  float")  of  at  least
$1,000,000 and a minimum bid price of the Class A Common Stock of at least $1.00
per share  (except at a time when the Class A Common Stock has a public float of
at least  $3,000,000  and the Company has an adjusted  tangible  net worth of at
least  $4,000,000).  On  November  15,  1996,  Nasdaq  proposed  more  stringent
requirements for the continued inclusion of securities on Nasdaq/NMS, as well as
for initial  listing and continued  listing on Nasdaq's Small Cap Market.  Among
the proposed Nasdaq/NMS  continued listing requirements are requirements for the
Company  to  maintain  an  adjusted  tangible  net worth of at least  $4,000,000
(regardless of profitability),  while the Class A Common Stock requires a public
float of at least $5,000,000 and a minimum bid price of at least $1.00 per share
(regardless  of the size of the public float and  adjusted  tangible net worth).
Should the Company fail to meet Nasdaq/NMS requirements,  in order for the Class
A Common Stock to be included on Nasdaq's Small Cap Market, under current rules,
among other  criteria,  the Company  would have to have total equity of at least
$2,000,000  and the Class A Common Stock would have to have a public float of at
least  $1,000,000  and minimum bid price of at least $3.00 per share (or, if the
proposed  rules  are  implemented,  the  Company  would be  required  to have an
adjusted  tangible net worth of at least $4,000,000 and the Class A Common Stock
would be required to have a public  float of at least  $5,000,000  and a minimum
bid price of at least  $4.00 per  share).  There  can be no  assurance  that the
Company will continue to be eligible for trading on Nasdaq/NMS  or, if not, meet
the requirements for listing or maintenance on the Nasdaq Small Cap Market.
    


                                 USE OF PROCEEDS

   
           The Company will not receive any proceeds from the sale of the Shares
by the Selling  Stockholders.  However, the Company received $9,000,000 from the
sale of the  Debentures on September 30, 1996. The net proceeds from the sale of
the  Debentures,  approximately  $8,600,000,  are being used by the  Company for
general working capital purposes,  principally for clinical programs for testing
diagnostic  and  therapeutic  products,   sales  and  marketing,   research  and
development  programs,  facility  expansion and the purchase of  equipment.  The
Company will receive  $5.765 per share to the extent the holders of the Warrants
elect to  exercise  the  Warrants,  or an  aggregate  of  $90,000  if all of the
Warrants  are  exercised  fully for cash (in lieu of the payment of the exercise
price in cash,  the  holders  of the  Warrants  may elect to receive a number of
shares  reduced by that  number of shares  having a then  aggregate  fair market
value equal to the requisite  exercise price).  Any such proceeds (before giving
effect to the expenses of this  offering,  estimated at $15,000) will be used by
the Company for working capital.
    




                                       -9-

<PAGE>

                              SELLING STOCKHOLDERS
   
           The following table sets forth information,  as at November 30, 1996,
with  respect to (i) each  Selling  Stockholder's  beneficial  ownership  of the
Company's  Common  Stock prior to the  offering of any Shares  hereunder by such
Selling  Stockholder,  (ii) the number of Shares  which may be offered  for sale
hereunder  and  (iii) the  number  shares of the  Company's  Common  Stock to be
beneficially owned by each Selling  Stockholder after the offering (assuming the
sale of all Shares being offered hereunder).
    
<TABLE>
<CAPTION>
                                                Shares of                                 Shares of
                                              Common Stock                                 Common
                                              Beneficially          Shares of               Stock
                                               Owned Prior           Common              Beneficially
        Name of Selling                            to              Stock to be              Owned
          Stockholder                         Offering(1)(2)     Offered Hereunder      After Offering
          -----------                         --------------     -----------------      --------------

DEBENTUREHOLDERS                                               
<S>                                            <C>                  <C>                       <C>
AG Super Fund International Partners, L.P. (3)   33,917               33,917                    0
                                                                                               
Aries Domestic Fund, L.P. (4)                    50,875               50,875                    0
                                                                                               
The Aries Trust (4)                             118,708              118,708                    0
                                                                                               
Capital Ventures International (5)              678,333              678,333                    0
                                                                                               
GAM Arbitrage Investments, Inc. (3)              84,792               84,792                    0
                                                                                               
Jeffrob Glorich Ltd.                             37,308               37,308                    0
                                                                                               
Leonardo, L.P. (3)                              305,250              305,250                    0
                                                                                               
P.R.I.F., L.P.                                1,017,500            1,017,500                    0
                                                                                               
ProFutures Special Equities Fund, L.P.          254,375              254,375                    0
                                                                                               
Raphael, L.P. (3)                                84,792               84,792                    0
                                                                                               
Societe Generale                                339,167              339,167                    0
                                                                                               
Woodlawn West Holdings, Inc.                     47,483               47,483                    0
                                                                                               
WARRANTHOLDERS                                                                                 
                                                                                               
Joseph Gil                                          312                  312                    0
                                                                                               
Thomas J. Griesel                                   781                  781                    0
                                                                                               
Timothy Holmes                                      937                  937                    0
                                                                                               
Harlan P. Kleiman                                10,152               10,152                    0
                                                                                               
Steven Lamar                                        312                  312                    0
                                                                                               
Robert K. Schacter                                3,124                3,124                    0
</TABLE>
- -----------------------
(1)    Shares deemed  beneficially owned prior to the offering (all of which may
       be offered hereby) by Debentureholders represents the number of shares of
       Class A Common Stock issuable upon conversion of (i) the principal amount
       of the Debentures held by such Selling Stockholder plus (ii) interest for
       one calendar  quarter  (since  accrued but unpaid  interest is also to be
       converted into Class A Common Stock) at the Minimum  Conversion  Price of
       $3.00.

(2)    Shares deemed  beneficially owned prior to the offering (all of which may
       be offered hereby) by  Warrantholders  represent shares of Class A Common
       Stock which may be purchased  upon  exercise of the Warrants held by such
       Warrantholder at an exercise price of $5.7625 per share.

                                      -10-
<PAGE>



(3)    These  Shares may also,  under the  Commission's  rules,  be deemed to be
       beneficially  owned by Angelo Gordon & Co., L.P.  which serves as general
       partner or investment advisor to each of these Debentureholders.

(4)    The Shares owned by each of Aries Domestic Fund, L.P. and The Aries Trust
       may also,  under the  Commission's  rules,  be deemed to be  beneficially
       owned by  Paramount  Capital  Asset  Management,  Inc.,  which  serves as
       investment  advisor  to The Aries  Trust  and  general  partner  to Aries
       Domestic Fund, L.P.

   
(5)    Susquehanna Securities Trading GmbH ("Susquehanna") acts as an investment
       advisor for Capital Ventures  International  ("Capital Ventures") and may
       also, under the  Commission's  rules, be deemed to beneficially own these
       Shares. In addition,  as of November 30, 1996,  Susquehanna  beneficially
       owned 225,772 shares of the Company's  Class A Common Stock issuable upon
       conversion of $700,000 of the  Company's 8%  Convertible  Debentures  due
       October 13, 1998 (including  accrued  interest ). Each of Susquehanna and
       Capital Ventures disclaims = beneficial  ownership of the shares owned by
       the other.
    

           On September 30, 1996, the Company  completed a private  placement to
the  Debentureholders  of an  aggregate  of  $9,000,000  of its  7%  Convertible
Debentures due September 30, 1998 (the "Debentures"). Interest on the Debentures
is payable quarterly at the rate of 7% per annum.  Debentures (together with any
accrued  but  unpaid  interest)  will  become  convertible  into  shares  of the
Company's  Class A Common  Stock to the  extent of 25% of the  principal  amount
thereof commencing on the effective date of the Registration  Statement of which
this Prospectus  forms a part, with an additional 25% of the principal amount of
the  Debentures  becoming  convertible  on each of the 30th,  60th and 90th days
thereafter at a conversion  price equal to 83% of the average of the closing bid
prices of the Company's  Class A Common Stock for the five  consecutive  trading
days ending on the trading day immediately  preceding the conversion date of the
Debentures (the "Current Market Price"); provided, however, that in no event may
the  conversion  price be less than  $3.00 per share  (the  "Minimum  Conversion
Price") nor greater than $8.00 per share (the "Maximum  Conversion  Price").  In
the event that, but for the Minimum  Conversion Price, the number of shares that
would have been issued is greater than the number of shares actually issued, the
holder  converting  such  Debenture  will also be entitled to receive cash in an
amount equal to such  difference  multiplied by the Current Market Price. In the
event any Debenture  remains  outstanding  at its maturity date, the Company has
the option to either  convert such Debenture into shares of Class A Common Stock
on the same basis as the Debentureholder  could have converted such Debenture or
pay the  outstanding  principal  amount  thereof,  plus any  accrued  and unpaid
interest thereon, in cash.

           As  partial  compensation  for  the  services  of  Shoreline  Pacific
Institutional  Finance,  The Institutional  Division of Financial West Group, as
placement  agent of the  Debentures,  the  Company  issued the  Warrants  to the
Warrantholders,  who are  brokers  affiliated  with  the  placement  agent.  The
Warrants  entitle the holders  thereof to purchase an aggregate of 15,618 Shares
at an exercise price of $5.7625 per share at any time until September 30, 1998.

           The Registration  Statement of which this Prospectus forms a part has
been filed by the Company pursuant to Registration  Rights  Agreements with each
of the  Debentureholders in which the Company has agreed, among other things, to
file  the  Registration   Statement  and  maintain  the  Registration  Statement
effective  and current (with  certain  exceptions)  until all of such Shares are
either sold pursuant to the Registration Statement or under Rule 144 promulgated
under  the   Securities   Act  or  such  time  as  Rule  144  would  permit  the
Debentureholders  to sell all of their Shares without  registration  during a 90
consecutive  day  period.  The  holders of a majority  of the Shares  issued and
issuable upon  conversion of Debentures may also demand,  on one occasion,  that
the Company file another  registration  statement  covering the Shares for which
the Company has agreed,  and during the period that the Company is required,  to
maintain the Registration Statement effective and current. In addition,  holders
of such Shares may also join in, in certain  circumstances,  other  registration
statements filed by the Company.  All expenses of all such  registrations are to
be  borne  by  the  Company,  other  than  brokerage  commissions,  underwriting
discounts and commissions, other fees and expenses of investment bankers and any
fees and  expenses  of counsel  employed by the  Debentureholders  which are the
obligations of the


                                      -11-

<PAGE>



Debentureholders.  The  Company has agreed to  indemnify  certain of the Selling
Stockholders and certain related persons against certain liabilities,  including
liabilities  under the  Securities  Act,  in  certain  instances  related to the
Registration Statement.


                              PLAN OF DISTRIBUTION

           The Shares may be offered  for sale from time to time by the  Selling
Stockholder  or their  pledgees,  donees,  transferees  or other  successors  in
interest, in the over-the-counter  market, in privately negotiated  transactions
or otherwise, at market prices prevailing at the time of sale, at prices related
to such prevailing market prices or at negotiated prices. The Shares may be sold
directly by the Selling Stockholders or through one or more broker-dealers. Such
broker-dealers may receive compensation in the form of commissions, discounts or
concessions from the Selling  Stockholders  and/or purchasers of Shares for whom
such broker-dealers may act as agent, or to whom they may sell as principal,  or
both (which  compensation as to a particular  broker-dealer  may be in excess of
customary commissions).  The Selling Stockholders and such broker-dealers may be
deemed to be "underwriters" within the meaning of the of Securities Act, and any
discounts,  commissions  and concessions and any profit realized on any sales of
the Shares may be deemed to be underwriting compensation.


                                  LEGAL MATTERS

           The  validity  of the Shares  offered  hereby  will be passed upon by
Parker Chapin Flattau & Klimpl, LLP, 1211 Avenue of the Americas,  New York, New
York 10036.


                                     EXPERTS

           The consolidated  financial  statements,  including the related notes
and schedules  thereto,  as of December 31, 1995 and for each of the three years
in the period then ended, which are incorporated by reference in this Prospectus
and  elsewhere  in the  Registration  Statement,  have  been  audited  by Arthur
Andersen LLP, independent public accountants, as indicated in their reports with
respect thereto,  and are included herein in reliance upon the authority of said
firm as experts in accounting and auditing in giving said reports.




                                      -12-

<PAGE>

======================================    ======================================

      NO PERSON HAS BEEN AUTHORIZED IN
CONNECTION   WITH  THE  OFFERING  MADE
HEREBY TO GIVE ANY  INFORMATION  OR TO
MAKE ANY  REPRESENTATION NOT CONTAINED
IN THIS  PROSPECTUS OR A SUPPLEMENT TO
THIS  PROSPECTUS,  AND,  IF  GIVEN  OR
MADE,     SUCH      INFORMATION     OR
REPRESENTATION MUST NOT BE RELIED UPON
AS  HAVING  BEEN   AUTHORIZED  BY  THE
COMPANY,  THE SELLING  STOCKHOLDERS OR
ANY   OTHER   PERSON.   NEITHER   THIS
PROSPECTUS  NOR ANY SUPPLEMENT TO THIS             3,068,118 SHARES         
PROSPECTUS  CONSTITUTES  AN  OFFER  TO                                      
SELL OR A SOLICITATION  OF AN OFFER TO                                      
BUY,  ANY  SECURITIES  OTHER  THAN THE    AMERICAN BIOGENETIC SCIENCES, INC.
SECURITIES  TO WHICH IT  RELATES OR AN                                      
OFFER TO SELL OR THE  SOLICITATION  OF                                      
AN OFFER TO BUY SUCH SECURITIES IN ANY               COMMON STOCK           
JURISDICTION  WHERE,  OR TO ANY PERSON                                      
TO WHOM,  IT IS  UNLAWFUL TO MAKE SUCH                                      
AN OFFER OR SOLICITATION.  NEITHER THE                                      
DELIVERY  OF THIS  PROSPECTUS  NOR ANY                                      
SUPPLEMENT TO THIS  PROSPECTUS NOR ANY                                      
SALE  MADE   HEREUNDER  OR  THEREUNDER                                      
SHALL, UNDER ANY CIRCUMSTANCES, CREATE                                      
ANY IMPLICATION THAT THERE HAS BEEN NO                PROSPECTUS            
CHANGE IN THE  AFFAIRS OF THE  COMPANY                                      
SINCE THE DATE  HEREOF OR  THEREOF  OR                                      
THAT THE INFORMATION  CONTAINED HEREIN                                      
IS CORRECT  AS OF ANY TIME  SUBSEQUENT                                      
TO  THE   DATES  AS  OF   WHICH   SUCH                                      
INFORMATION IS FURNISHED.                                                   
                                                                            
                                                                            
         -----------------                                                  
                                                    December  ,1996         
         TABLE OF CONTENTS                                                  
                                 Page
                                 ----

Available Information.............. 2
Information Incorporated
 by Reference...................... 2
The Company........................ 3
Risk Factors....................... 3
Use of Proceeds.................... 9
Selling Stockholders...............10
Plan of Distribution...............12
Legal Matters......................12
Experts............................12


======================================    ======================================

<PAGE>

                                    PART II.

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

           It is estimated  that the following  expenses (all of which are being
borne by the Company) will be incurred in connection with the proposed  offering
under this Registration Statement:

             Filing Fee for Registration Statement ........... $    5,404.07
             Legal and accounting fees and expenses ..........      7,500.00
             Miscellaneous ...................................      2,095.93
                                                               -------------
             Total ........................................... $   15,000.00
                                                               =============

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

           Section 145 of the General  Corporation  Law of the State of Delaware
(the "DGCL") provides,  in general,  that a corporation  incorporated  under the
laws of the State of Delaware, such as the registrant,  may indemnify any person
who was or is a party or is  threatened  to be made a party  to any  threatened,
pending or completed action,  suit or proceeding (other than a derivative action
by or in the right of the corporation) by reason of the fact that such person is
or was a director,  officer, employee or agent of the corporation,  or is or was
serving at the request of the  corporation as a director,  officer,  employee or
agent of another  enterprise,  against  expenses  (including  attorneys'  fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred
by such person in connection with such action, suit or proceeding if such person
acted in good faith and in a manner such person reasonably  believed to be in or
not opposed to the best interests of the  corporation,  and, with respect to any
criminal action or proceeding,  had no reasonable cause to believe such person's
conduct was unlawful. In the case of a derivative action, a Delaware corporation
may indemnify  any such person  against  expenses  (including  attorneys'  fees)
actually and reasonably  incurred by such person in connection  with the defense
or settlement of such action or suit if such person acted in good faith and in a
manner  such  person  reasonably  believed  to be in or not  opposed to the best
interests of the corporation,  except that no  indemnification  shall be made in
respect of any claim,  issue or matter as to which such  person  shall have been
adjudged to be liable to the corporation  unless and only to the extent that the
court determines such person is fairly and reasonably  entitled to indemnity for
such  expenses.   Article  VII  of  the   registrant's   By-laws   provides  for
indemnification of directors,  officers,  employees and agents of the Company to
the full extent permitted under Delaware law. In addition,  Article TENTH of the
registrant's Restated Certificate of Incorporation provides, in general, that no
director of the registrant  shall be personally  liable to the registrant or any
of its  stockholders  for  monetary  damages for breach of  fiduciary  duty as a
director,  except for  liability  (i) for any breach of the  director's  duty of
loyalty to the corporation or its  stockholders,  (ii) for acts or omissions not
in good faith or which involve intentional  misconduct or a knowing violation of
law,  (iii) under  Section 174 of the DGCL (which  provides  that under  certain
circumstances,  directors  may be jointly  and  severally  liable for willful or
negligent  violations of the DGCL provisions  regarding the payment of dividends
or stock  repurchases  or  redemptions),  as the same exists or hereafter may be
amended, or (iv) for any transaction from which the director derived an improper
personal benefit.

           Pursuant to Section 6 of the Registration  Rights Agreements  between
the Company and the  Debentureholders,  the Company has agreed to indemnify  and
hold  harmless  the  Debentureholders,  their  officers and  directors  and each
person,  if any, who controls  (within the meaning of the Securities Act and the
Exchange  Act)  against any losses,  claims,  damages,  expenses or  liabilities
(joint or several) to which the indemnified persons may become subject under the
Securities  Act, the Exchange Act or otherwise  insofar as such losses,  claims,
damages,  expenses or liabilities (or actions or proceedings,  whether commenced
or  threatened,  in respect  thereof)  arise out of or are based upon any untrue
statement  or alleged  untrue  statement  of a material  fact  contained  in the
Registration  Statement or any post-effective  amendment thereof or the omission
or alleged  omission  to state  therein a material  fact  required  to be stated
therein or necessary to make the statements therein not misleading except to the
extent that such untrue  statement  or omission or alleged  untrue  statement or
omission

                                      II-1
<PAGE>



is based upon information furnished in writing to the Company by any indemnified
person expressly for use in the Registration  Statement.  The Company has agreed
to reimburse the indemnified  persons for any legal or other expenses reasonably
incurred by them in connection  with  investigating  or defending any such loss,
claim, damage, liability or action.

ITEM 16.       EXHIBITS.

4.01           Restated  Certificate of Incorporation  of the Company,  as filed
               with  the  Secretary  of  State of  Delaware  on July  30,  1996.
               Incorporated  by  reference  to  Exhibit  4.01  to the  Company's
               Registration Statement on Form S-8, File No. 333-09473.

4.02           Amended and  Restated  By-Laws of the  Company.  Incorporated  by
               reference to Exhibit 4.02 to the Company's Registration Statement
               on Form S-8, File No. 333-09473.

5.01*          Opinion and consent of Parker Chapin Flattau & Klimpl,  LLP as to
               the legality of the Class A Common Stock being offered.

   
23.01+         Consent of Arthur Andersen LLP.
    

23.02*         Consent of Parker  Chapin  Flattau & Klimpl,  LLP  (contained  in
               Exhibit 5.01).

   
24.01*         Powers of Attorney of Alfred J. Roach, Josef C. Schoell,  Paul E.
               Gargan,  Ellena M. Byrne,  Joseph C. Hogan,  Timothy J. Roach and
               William G. Sharwell.
    

99.1           Form of the Company's 7% Convertible Debentures.  Incorporated by
               reference to Exhibit 4.01 to the Company's Current Report on Form
               8-K dated (date of earliest event  reported)  September 30, 1996,
               File No. 0-19041.

99.2           Form of the  basic  Registration  Rights  Agreement  between  the
               Company  and  each  of  the  Debentureholders.   Incorporated  by
               reference to Exhibit 99.1 to the Company's Current Report on Form
               8-K dated (date of earliest event  reported)  September 30, 1996,
               File No. 0-19041.

99.3           Form of  Warrant  issued to  brokers  affiliated  with  Shoreline
               Pacific  Institutional  Finance,  The  Institutional  Division of
               Financial West Group.  Incorporated  by reference to Exhibit 99.2
               to the  Company's  Current  Report  on Form  8-K  dated  (date of
               earliest event reported) September 30, 1996, File No. 0-19041.

- ------------------------
   
*      Previously filed with the initial filing of this Registration Statement.

+      Filed herewith.
    

ITEM 17.   UNDERTAKINGS.

           The undersigned registrant hereby undertakes:

           (1)        To file,  during any  period in which  offers or sales are
being made, a post-effective amendment to this registration statement:

                      i) To include any prospectus  required by Section 10(a)(3)
of the Securities Act of 1933;

                      ii) To  reflect  in the  prospectus  any  facts or  events
arising  after the  effective  date of the  registration  statement (or the most
recent  post-effective   amendment  thereof)  which,   individually  or  in  the
aggregate,  represent a fundamental  change in the  information set forth in the
registration statement;



                                      II-2

<PAGE>



                      iii) To include any material  information  with respect to
the plan of distribution not previously disclosed in the registration  statement
or any material change to such information in the registration statement;

provided,  however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
registration statement is on Form S-3, Form S-8, and the information required to
be included in a  post-effective  amendment by those  paragraphs is contained in
periodic reports filed by the registrant  pursuant to Section 13 or 15(d) of the
Securities  Exchange  Act of 1934  that are  incorporated  by  reference  in the
registration statement.

           (2)        That, for the purpose of determining  any liability  under
the Securities Act of 1933, each such  post-effective  amendment 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.

           (3)        To remove from  registration by means of a  post-effective
amendment  any of the  securities  being  registered  which remain unsold at the
termination of the offering.

           The undersigned  registrant  hereby undertakes that, for the purposes
of determining  any liability  under the Securities Act of 1933,  each filing of
the registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities  Exchange  Act of 1934  that is  incorporated  by  reference  in this
registration  statement  shall  be  deemed  to be a new  registration  statement
relating to the securities  offered herein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

           Insofar  as  indemnification   for  liabilities   arising  under  the
Securities Act of 1933 may be permitted to directors,  officers and  controlling
persons  of the  registrant  pursuant  to the  provisions  described  above,  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 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,  the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.



                                      II-3

<PAGE>




                                   SIGNATURES
                                   ----------

   
           Pursuant  to the  requirements  of the  Securities  Act of 1933,  the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the  Town of  Copiague,  State of New  York,  on the 20th day of
December, 1996.
    


                                       AMERICAN BIOGENETIC SCIENCES, INC.


                                       By:   /s/ Alfred J. Roach
                                          ---------------------------
                                          Alfred J. Roach, Chairman of the Board


   
           Pursuant to the  requirements  of the  Securities  Act of 1933,  this
Registration  Statement  has been signed below by the  following  persons in the
capacities indicated on the 20th day of December, 1996.
    

           Signature                         Title
           ---------                         -----

/s/ Alfred J. Roach           Chairman of the Board (Chief Executive Officer)
- -------------------------
Alfred J. Roach                                       

   
/s/  Josef C. Schoell         Vice President, Finance (Principal Financial and 
- -------------------------     Accounting Officer)
Josef C. Schoell
    

  * Paul E. Gargan            Director
- -------------------------
Paul E. Gargan
   

  * Ellena M. Byrne           Director
- -------------------------
Ellena M. Byrne
    


   
  * Joseph C. Hogan           Director
- -------------------------
Joseph C. Hogan
    

/s/ Timothy J. Roach          Director
- -------------------------
Timothy J. Roach              

   
  * William G. Sharwell       Director
- -------------------------
William G. Sharwell                                   


*
By:  /s/ Josef C. Schoell
   -------------------------
    Josef C. Schoell
    Attorney-in-Fact
    

<PAGE>



                                  EXHIBIT INDEX

Exhibit
Number

4.01           Restated  Certificate of Incorporation  of the Company,  as filed
               with  the  Secretary  of  State of  Delaware  on July  30,  1996.
               Incorporated  by  reference  to  Exhibit  4.01  to the  Company's
               Registration Statement on Form S-8, File No. 333-09473.

4.02           Amended and  Restated  By-Laws of the  Company.  Incorporated  by
               reference to Exhibit 4.02 to the Company's Registration Statement
               on Form S-8, File No. 333-09473.

5.01*          Opinion and consent of Parker Chapin Flattau & Klimpl,  LLP as to
               the legality of the Class A Common Stock being offered.

   
23.01+         Consent of Arthur Andersen LLP.
    

23.02*         Consent of Parker  Chapin  Flattau & Klimpl,  LLP  (contained  in
               Exhibit 5.01).

24.01*         Powers of Attorney of Alfred J. Roach, Josef C. Schoell,  Paul E.
               Gargan,  Ellena M. Byrne,  Joseph C. Hogan,  Timothy J. Roach and
               William G. Sharwell.

99.1           Form of the Company's 7% Convertible Debentures.  Incorporated by
               reference to Exhibit 4.01 to the Company's Current Report on Form
               8-K dated (date of earliest event  reported)  September 30, 1996,
               File No. 0-19041.

99.2           Form of the  basic  Registration  Rights  Agreement  between  the
               Company  and  each  of  the  Debentureholders.   Incorporated  by
               reference to Exhibit 99.1 to the Company's Current Report on Form
               8-K dated (date of earliest event  reported)  September 30, 1996,
               File No. 0-19041.

99.3           Form of  Warrant  issued to  brokers  affiliated  with  Shoreline
               Pacific  Institutional  Finance,  The  Institutional  Division of
               Financial West Group.  Incorporated  by reference to Exhibit 99.2
               to the  Company's  Current  Report  on Form  8-K  dated  (date of
               earliest event reported) September 30, 1996, File No. 0-19041.

- ------------------------
   
*    Previously filed with the initial filing of this Registration Statement.

+    Filed herewith.
    


       






                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this  registration  statement of our report dated February 28, 1996
included in American  Biogenetic  Sciences,  Inc.'s Form 10-K for the year ended
December  31,  1995  and  to  all  references  to  our  Firm  included  in  this
registration statement.




                                              /s/ Arthur Andersen LLP
                                              Arthur Andersen LLP


   
Melville, New York
December 20, 1996
    




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