AMERICAN BIOGENETIC SCIENCES INC
S-3/A, 1998-08-07
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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    As filed with the Securities and Exchange Commission on August 7, 1998

                                                     Registration No. 333-59345

                       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 Number)

                      1375 Akron Street, Copiague, NY 11726
          (Address, Including Zip Code, and Telephone Number, Including
             Area Code, of Registrant's Principal Executive Offices)
                           --------------------------

                             RICHARD A. RUBIN, ESQ.
                       PARKER CHAPIN FLATTAU & KLIMPL, LLP
                           1211 Avenue of the Americas
                            New York, New York 10036
                                 (212) 704-6000
            (Name, Address, Including Zip Code, and Telephone Number,
                   Including Area Code, of Agent for Service)
                           --------------------------

         Approximate  date of  commencement  of proposed sale to the public:  As
soon as practicable 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. [ ]

         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>

  PROSPECTUS
                                4,261,228 Shares

                       American Biogenetic Sciences, Inc.

                              Class A Common Stock
                               -------------------

         This  Prospectus  relates to an  aggregate  of  4,261,228  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 4,000,000 Shares which may
be issued upon  conversion  of  $4,000,000  principal  amount of 5%  Convertible
Debentures  due May 20, 2001,  including any accrued  interest which the Company
may elect to pay in Shares (the  "Debentures"),  and a maximum of 261,228 Shares
that may be issued upon the  exercise of Warrants  (the  "Warrants")  which were
sold by the Company in a private placement. See "Selling Stockholders".

   
         The  Class A Common  Stock is  quoted  on The  Nasdaq  National  Market
("Nasdaq/NMS") under the symbol "MABXA." On August 5, 1998, the closing price on
Nasdaq/NMS for the Class A Common Stock was $1.00 per share.
    

         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,  directly to other purchasers or through broker-dealers in one or more
market transactions,  in one or more private transactions or in a combination of
such  methods of sale,  at prices  then  prevailing,  at prices  related to such
prices or at  negotiated  prices.  Such  methods of  distribution  may  include,
without limitation, (a) a block trade in which the broker-dealer so engaged will
attempt to sell the Shares as agent but may position and resell a portion of the
block  as  a  principal  to  facilitate  the  transaction;  (b)  purchases  by a
broker-dealer  as a  principal  and  resale  by such  broker-dealer  for its own
account  pursuant to the  Registration  Statement of which this  Prospectus is a
part; (c) ordinary  brokerage  transactions and transactions in which the broker
solicits  purchasers;  and (d) face-to  face  transactions  between  sellers and
purchasers  without a broker or  dealer.  This  Prospectus  may be  amended  and
supplemented  from time to time to describe a specific plan of distribution.  In
addition,  any Common Stock covered by this  Prospectus that so qualifies may be
sold  under  Rule  144  under  the  Securities  Act of  1933,  as  amended  (the
"Securities  Act").  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-dealers  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,  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".

         While the Company will not receive any  consideration  from the sale of
the Shares, it did receive consideration from the sale of the Debentures and the
Warrants  and may  receive  additional  consideration  from the  exercise of the
Warrants.  See "Use of Proceeds".  The Company will pay all expenses incurred in
effecting the registration of the Shares,  including all registration and filing
fees,  and legal and  accounting  fees for counsel to the  Company.  The Selling
Stockholders will bear all brokerage or underwriting  discounts,  commissions or
expenses, if any, and the fees and expenses, if any, of its counsel in excess of
$5,000, which are applicable to the Shares. 
                              -------------------

                   An investment in the Shares involves a high
                       degree of risk. See "Risk Factors"
                              beginning on page 3.

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

    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 August 7, 1998.
    


<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
Judiciary Plaza, 450 Fifth Street, NW, Room 1024, Washington, D.C. 20549, and at
the Commission's  Regional Offices at Citicorp Center,  500 West Madison Street,
Suite 1400,  Chicago,  Illinois 60661 and 7 World Trade Center,  Suite 1300, New
York, New York 10048, at prescribed  rates.  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  Company's  Common  Stock is quoted on The Nasdaq  Stock
Market, and reports,  proxy statements and certain other information  concerning
the Company can also be  inspected at the offices of Nasdaq  Operations,  1735 K
Street NW, Washington, D.C. 20006.

         The Company has filed with the Commission a  Registration  Statement on
Form S-3 (the  "Registration  Statement")  under the  Securities Act of 1933, as
amended (the  "Securities  Act"),  with respect to the Shares.  This Prospectus,
which constitutes a part of the Registration Statement,  does not contain all of
the  information  set forth in the  Registration  Statement and the exhibits and
schedules thereto,  to which reference is hereby made.  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.
The  Registration  Statement  has  been  filed  through  EDGAR  and is  publicly
available   through  the   Commission's  Web  site   (http://www.sec.gov).   The
Registration  Statement,  together  with  its  exhibits  and  schedules,  may be
inspected  without charge at the Public  Reference  Section of the Commission in
Washington,  D.C.  at the  address  noted  above,  and copies of all or any part
thereof may be obtained from the Commission upon payment of the prescribed fees.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The  following  documents  heretofore  filed  by the  Company  with the
Commission  pursuant to the  Exchange Act (File No.  0-19041)  are  incorporated
herein by reference:

          (1)     the  Company's Annual  Report on Form 10-K for  the year ended
                  December 31, 1997;

   
          (2)     the Company's  unaudited Quarterly Report on Form 10-Q and the
                  amendment thereto for the fiscal quarter ended March 31, 1998;
    

          (3)     the  Company's  Current  Reports  on Form 8-K  dated  (date of
                  earliest event reported) April 27, 1998 (as filed on April 28,
                  1998) and May 20, 1998 (as filed on June 3, 1998); and

          (4)     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 all amendments or
                  reports filed for the purpose of updating such description.
                              
                                        2

<PAGE>



         All  reports  and other  documents  subsequently  filed by the  Company
pursuant to Sections  13(a),  13(c),  14 or 15(d) of the  Exchange Act after the
date of this  Prospectus  and prior to the  termination of the offering shall be
deemed to be  incorporated  by  reference in this  Prospectus  and shall 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 that 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 the Registration Statement or this Prospectus.

         The Company will provide  without charge to each person,  including any
beneficial  owner,  to whom this  Prospectus is delivered,  upon written or oral
request of such person, a copy of any of the documents incorporated by reference
in this  Prospectus  (other than  exhibits  unless such  exhibits are  expressly
incorporated by reference in such documents). Requests for such documents should
be submitted  in writing to:  American  Biogenetic  Sciences,  Inc.,  1375 Akron
Street, Copiague, New York 11726, or by telephone at (516) 789-2600, Attn: Chief
Financial Officer.


                                   THE COMPANY

         American Biogenetic Sciences,  Inc. (the "Company" or the "Registrant")
is engaged in the research,  development  and production 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.  These
efforts have led to the development of the Company's  Thrombus Precursor Protein
(TpP(TM))  test, an assay for the risk  assessment of active  thrombosis  (blood
clots) and the  monitoring  of  anticoagulent  therapy,  and  Functional  Intact
Fibrinogen (FiF(TM)) test, an assay to measure levels of fibrinogen in blood, as
well  as to the  Company's  patented  specific  monoclonal  antibody  MH1,  with
radioisotope,  for use as an in vivo imaging agent. In October 1996, the Company
received a Section  510(k)  PreMarket  Clearance from the United States Food and
Drug  Administration  ("FDA") for its TpP(TM)  test.  In June 1997,  the Company
received  a Section  510(k)  Pre-Market  Clearance  from the FDA to  market  its
FiF(TM) test. In November 1997, the Company  initiated its marketing efforts for
the TpP(TM) and FiF(TM) through  exhibitions and presentations at the MEDICA '97
trade show held in Dusseldorf,  Germany.  These efforts led to the initial sales
of TpP(TM) kits to European and Japanese  distributors.  On April 23, 1998,  the
Company  purchased all of the issued and  outstanding  shares of common stock of
Stellar Bio  Systems,  Inc.  ("Stellar"),  a  manufacturer  and  distributor  of
research reagents and diagnostic products.

         The  Company  was  incorporated  in Delaware  in  September  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.
                                                                    
                                        3

<PAGE>



                                  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  herein by reference.  Certain statements  included in
this  Prospectus  (and  the  information   incorporated   herein  by  reference)
concerning  the  Company's  future  results,  future  performance,   intentions,
objectives,  plans and expectations contain  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  remains  in  the  development  stage  as it has  not  yet
generated  significant  revenues from product sales.  The Company has,  however,
received an  aggregate of  $1,302,000  in licensing  fees,  royalties  and under
collaborative   agreements   from  its   inception   through   March  31,  1998.
Additionally,  during the fourth  quarter of fiscal  1997,  the Company made its
initial  sales of  TpP(TM).  Through  March  31,  1998,  sales of the  Company's
products aggregated  $264,000.  Further, in April 1998, the Company acquired all
of the issued and  outstanding  shares of common stock of Stellar.  For the year
ended December 31, 1997,  Stellar was profitable and had revenues of $1,400,000.
While the Company has products at various stages of development  and has started
to generate revenues, there can be no assurance as to when the Company may begin
generating significant 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.

         The  Company's  activities,   together  with  the  Company's  research,
development,   and  general  and  administrative   expenses,  have  resulted  in
significant  losses and are expected to continue to result in significant losses
for the  foreseeable  future.  At March 31,  1998,  the Company had net worth of
$5,658,000,  with an accumulated  retained earnings deficit of $50,832,000.  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  successfully
such products directly or through partners,  and its ability to acquire products
which can be successfully marketed.

         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.  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 March 31, 1998, the Company had working  capital of  $5,249,000.  On
May 20,  1998,  the  Company  sold the  Debentures  and  Warrants  in a  private
placement, generating net proceeds of approximately $3,744,000.   

                                        4

<PAGE>



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
dilution of the interests of the then existing  stockholders in the Company. The
Company also intends to continue 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 to market
the  Company's  products,  which may result in the Company  sharing the benefits
(i.e.,  royalty  payments) 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 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  additional  financing  necessary  on
acceptable terms, it would be unable to successfully  complete development of or
commercialize its products.

Acquisition Strategy and Integration of Acquisitions.

         Part of the  Company's  growth  strategy  involves the  acquisition  of
companies  and product  lines which the Company  believes  could provide it with
access  to   technologies,   products,   management  and  technical   expertise,
manufacturing  capabilities or  manufacturing  sources,  and/or  distribution or
market means that could  provide  synergisms  with the  Company's  operations or
otherwise facilitate its growth.

         The Company's only  acquisition  to date was the  acquisition of all of
the common stock of Stellar, a manufacturer and distributor of research reagents
and  diagnostic  products,  in April 1998 for  $120,000,  398,406  shares of the
Company's  Class A Common Stock ($700,000 at then market value) and a contingent
future payment of up to $650,000 in shares of the Company's Class A Common Stock
based on the level of  Stellar's  future  revenues  and the market  price of the
Company's  Common  Stock at  approximately  the  date of  issuance.  Any  future
acquisition may result in the use of the Company's cash,  necessitate borrowings
or  result  in the sale or  issuance  of debt or equity  securities  to  private
sources or in public  markets.  The  issuance  of any debt  could  result in the
incurrence of significant  interest expense and an obligation to repay such debt
in priority to payments to the  Company's  stockholders.  The issuance of equity
could  result  in  substantial  dilution  in the  equity  interest  of  existing
stockholders.  Although the Company is considering acquisitions and is currently
engaged in various stages of discussions with regard to potential  acquisitions,
the  Company is not  presently  a party to any  commitment  with  respect to any
acquisition.

         The success of any  acquisition,  including the acquisition of Stellar,
will depend in large measure on the Company's  ability to effectively  integrate
the operations,  management and information systems of the acquired  businesses.
The  process  of  integrating  acquired  businesses  often  involves  unforeseen
difficulties  and may require the Company to devote a significant  amount of its
financial  and other  resources  thereto.  Acquisitions  may involve a number of
additional risks, such as adverse  short-term  effects on the Company's reported
operating  results,  diversion  of  management's  attention,  the ability of the
Company to retain key personnel,  unanticipated  problems or legal  liabilities,
and amortization  expense for the amount of the purchase price paid for acquired
assets in excess of their fair value,  some or all of such factors  could have a
material  adverse  effect on the  Company's  business,  financial  condition and
results of operations.  Further,  to the extent that the agreements  relating to
acquisitions  by the Company  provide for  indemnification  of the Company  with
respect  to  contingent  and other  liabilities  of the  acquired  entity,  such
indemnification  obligations  may be, and are in the case of the  acquisition of
Stellar,  for a limited duration and subject to negotiated  limitations.  If any
claims or liabilities of the Company
                                        5

<PAGE>



relating to acquisitions are not subject to any indemnification  obligations, or
if the amount of such  claims or  liabilities  exceed  such  limitations  or the
ability of the sellers of the acquired entities to satisfy their indemnification
obligations,   the  Company's  business,  financial  condition  and  results  of
operations could be materially and adversely effected.

         There  can be no  assurance  that the  Company  will be  successful  in
identifying or consummating  acquisitions  on favorable  terms, if at all, or in
integrating  the  operations  of  Stellar  or future  acquisitions,  or that any
acquired  businesses  will  achieve  sales and  profitability  that  justify the
Company's investment therein.

Unproven Products.

         Although  the Company  has had recent  sales of its TpP(TM) and FiF(TM)
kits and products acquired as part of the acquisition of Stellar,  the Company's
existing products,  products under development and proposed products are subject
to the risks  inherent  in the  development  of  biotechnology  products.  These
products  require  further   research,   development,   testing  and  regulatory
clearance. Such products require demonstration of commercial scale manufacturing
before any  products  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 the  development  of any  product  that  meets  applicable  regulatory
standards or continues to meet applicable  regulatory  standards,  is capable of
being produced in commercial  quantities at reasonable  costs,  is acceptable to
the  medical  community,  or will be  successfully  marketed.  Accordingly,  the
Company  is  unable  to  predict  whether  its  technology  will  result  in any
commercially viable products.

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 FDA,  including  review and/or approval before  marketing,  as
well as by comparable foreign and state agencies.  Noncompliance with applicable
requirements  can result in,  among  other  things,  fines,  injunctions,  civil
penalties,  recall or  seizure  of  products,  total or  partial  suspension  of
production,   failure  of  the  government  to  grant  pre-market  clearance  or
pre-market  approval for  devices,  withdrawal  of  marketing  or  manufacturing
approvals and criminal prosecutions.

         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 a
Section 510(k) Pre-Market  Clearance to market the TpP(TM) test as an aid in the
risk  assessment of thrombosis and the monitoring of  anticoagulant  therapy and
plans to submit  additional  pre-market  notifications  to obtain  clearance  to
market the test for additional specific  indications.  In June 1997, the Company
received Section 510(k)  Pre-Market  Clearance to market its FiF(TM)  diagnostic
test for the quantitative determination of fibrinogen in human plasma.

         Obtaining FDA approval and complying with FDA  regulation  with respect
to 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,  including  therapeutic
products,  so that 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

                                        6

<PAGE>



any such  arrangements or, if it is able to, that the terms of such arrangements
will be favorable to the Company. Further, until the Company's under development
and proposed  therapeutic  products have been clinically tested, there can be no
assurance  that such products will be found safe and  efficacious or superior to
products previously approved by the FDA.

         Any FDA,  foreign or state  regulatory  approvals or  clearances,  once
obtained,  can be withdrawn or modified.  Delay by the Company in obtaining,  or
inability of the Company to obtain and maintain,  any necessary United States or
foreign clearances or manufacturing and marketing  approvals for new or existing
products or product  enhancements,  or  unanticipated  cost resulting from these
regulatory  requirements,  would have a material adverse effect on the Company's
business, financial condition and results of operations.

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.
Additionally,  any of the  Company's  products may face  competition  from other
products  which may be as or more  effective  than the Company's  products for a
given  indication.  Accordingly,  there  can  be no  assurance  that  any of the
Company's products will be accepted in the medical  community,  or, if accepted,
as to the length of time it would take to gain such acceptance.

Marketing Arrangements or Other Sales Arrangements.

         It has  been the  Company's  policy  to seek  arrangements  with  large
pharmaceutical  companies to market its existing and under development products.
In the event the Company is unable to enter into  sufficient  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 may  require the Company to develop a marketing
program to support  sales.  In such event,  the Company may 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  products.  Any  independent  distributors
that the Company may engage may also market competitive  products.  There can be
no assurance  that the Company will be able to enter into  arrangements  for the
distribution of any products on satisfactory terms.

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  practices  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.  It is the
Company's  intention to seek additional third parties to manufacture its in vivo
monoclonal antibody and other in vivo products, 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  products  must comply with FDA
regulations  and file  documentation  with the FDA to  support  that part of the
manufacturing  process  in  which  it is  involved.  The  Company  is  currently
contracting with four good manufacturing practices manufacturers for

                                        7

<PAGE>



the  production  of  antibodies  and the TpP(TM) and FiF(TM)  kits.  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  or  approval,  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 business depends in part upon its proprietary technology.
The Company  relies on a combination of trade secret laws,  patents,  trademarks
and  confidentiality  agreements and other contractual  provisions to establish,
maintain and protect its  proprietary  rights,  all of which afford only limited
protection. 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 or disclose such  technology or that
the Company can meaningfully protect its trade secrets.

         The Company  has been issued or licensed to use twelve  patents and has
additional  patent  applications  pending in the United States.  The Company has
obtained or applied for  corresponding  patents for certain of these patents and
patent  applications  in a limited  number of foreign  countries.  These patents
relate to certain products of the Company under development including the use of
monoclonal antibodies specific for fibrinogen and monoclonal antibodies specific
for  fibrin,  the use of the  Company's  antigen  free mouse  colony to generate
monoclonal  antibodies,  a method of obtaining primed lymphocytes collected from
immunized  antigen-free  mice,  an  immunoassay  for  soluble  fibrin  using the
Company's  proprietary  fibrin-specific  monoclonal  antibody  as  a  method  of
detecting  a   thrombotic   event,   the  use  of  the   Company's   proprietary
fibrin-specific  monoclonal antibody as an antithrombotic  agent, and the use of
the Company's  proprietary  fibrin-specific  monoclonal  antibody in conjunction
with a  thrombolytic  reagent for the  treatment  of  thrombosis.  There can be,
however,  no assurance  that the Company's  pending patent  applications  or any
future applications will be approved,  that any patents will provide the Company
with competitive  advantages or will not be challenged by third parties, or that
the  patents  of others  will not  render  the  Company's  patents  obsolete  or
otherwise have an adverse effect on the Company's  ability to conduct  business.
Because  foreign  patents may afford less  protection  under foreign law than is
available  under United  States patent law,  there can be no assurance  that any
such  patents  issued to the  Company  will  adequately  protect  the  Company's
proprietary information.  Others may have filed and may file patent applications
in the future  that are  similar to or  identical  to those of the  Company.  To
determine the priority of  inventions,  the Company may have to  participate  in
interference  proceedings  declared by the United  States  Patent and  Trademark
Office or  opposition  proceedings  before a foreign  patent  office  that could
result in  substantial  cost to the Company.  No assurance can be given that any
such interfering patent or patent application will not have priority over patent
applications  filed on behalf of the Company or that the Company will prevail in
any  opposition  proceeding.  In addition,  there can be no  assurance  that the
Company's  products and  technologies  do not infringe or violate any patents or
proprietary rights of third parties. Any intellectual  property litigation would
be costly and could divert the efforts and attention of the Company's management
and  technical  personnel,  which  could have a material  adverse  effect on the
Company's business, financial condition and results of operations.

         Many of the Company's  therapeutic  compounds are the subject of patent
applications  licensed by the Company from various academic  institutions.  Such
licenses  require the Company to pay  royalties on the sales of products.  There
can be no assurance that these licensed products will be commercially  viable or
that the licenses will not be terminated.

         With  respect  to  certain  aspects  of  its  technology,  the  Company
currently  relies  upon,  and intends to continue to rely upon,  trade  secrets,
unpatented  proprietary  know-how and  continuing  technological  innovation  to
protect access to the Company's proprietary  information.  Relationships between
the Company and its

                                        8

<PAGE>



scientific  consultants and collaborators may provide such persons access to the
Company's   know-how,   although,   in   general,   the   Company   enters  into
confidentiality  agreements with the parties involved.  Similarly, the Company's
employees and  consultants  have entered into  agreements with the Company which
require that such persons forebear from disclosing  confidential  information of
the Company and to assign to the Company all rights in any inventions made while
in the Company's  engagement relating to Company activities.  All members of the
Company's  Scientific  Advisory  Committee  are  employed by or have  consulting
agreements  with third  parties,  the  business of which may conflict or compete
with the Company,  and any inventions  discovered by such  individuals  will not
become the property of the Company. See "--Scientific  Advisors to the Company",
below.  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.  To  the  extent  that  consultants,
employees,  collaborators or other third parties apply technological information
independently  developed by them or by others to Company projects,  disputes may
arise as to the ownership of such information which may not be resolved in favor
of the Company.  Any  unauthorized  disclosure of the Company's trade secrets or
proprietary  know-how  would have a  material  adverse  effect on the  Company's
business, financial condition and results of operations.

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 the research and development of 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 biotechnology
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. Any such development by competitors, or the failure by the Company to
meet and surpass its competitors'  technological advances, could have a material
adverse  effect on the Company's  business,  financial  condition and results of
operations.  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,  Dr.  Stephen H. Ip,  President,  Chief  Operating
Officer  and a  Director  of the  Company,  and  Dr.  Emer  Leahy,  Senior  Vice
President-Business  Development  of the  Company.  Dr. Ip and Dr. Leahy are each
parties to employment  agreements  with the Company,  which expire  December 31,
1999 and  November  30,  2001,  respectively.  Mr.  Roach is not  subject to any
employment agreement.  The Company does not maintain life insurance on the lives
of Mr. Roach, Dr. Ip or Dr. Leahy. The loss of the services of Mr. Roach, Dr. Ip
or Dr. Leahy, 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.
                                        9

<PAGE>

Scientific Advisors to the Company.

         The Company has a Scientific  Advisory  Committee which is comprised of
scientific  advisors who serve as consultants to the Company with respect to the
fields of microbiology,  immunology and molecular  biology and in cardiovascular
disease, hepatic disease and drug development.  These scientists 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.  There can be no  assurance  that  regulations  or
policies now in effect or adopted in the future to which these  individuals  are
or may be subject  with such other  entities  might not limit the ability of the
scientific advisors to continue their relationship with the Company.

Product Liability; Requirement for 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 negative  reactions by the human immune system to mouse derived
antibodies  have been  reported.  Product  and  other  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 therapeutic products.

         Certain distributors of pharmaceutical products require minimum product
liability  insurance  coverage as a condition  precedent  to the  purchase of or
acceptance  of 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
Company's business, financial condition and results of operations.

         The Company has  obtained  product  liability  insurance  covering  its
TpP(TM) and FiF(TM) products,  but does not maintain product liability insurance
coverage  for its other  products.  Although  the Company will attempt to obtain
product  liability  insurance  prior  to the  marketing  of any of its  proposed
products, there can be no assurance that the Company will be able to secure such
insurance or, if available,  that such insurance can be acquired at a reasonable
cost or will be  sufficient to cover all possible  liabilities.  In the event of
any claim or suit  against  the  Company,  lack or  insufficiency  of  insurance
coverage  could  have a  material  adverse  effect  on the  business,  financial
condition and results of operations of the Company.

Control By Alfred J. Roach.

         As at June  30,  1998,  Alfred  J.  Roach,  Chairman  of the  Board  of
Directors  of the  Company,  owned  and had the  power  to  vote  all  1,775,500
outstanding  shares of the Company's  Class B Common Stock and 885,250 shares of
the  Company's  Class A Common Stock (and held options to purchase an additional
1,160,000  shares  of the  Company's  Class A Common  Stock,  all of which  were
exercisable on June 30, 1998). Each share of Class B Common 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 48.5% of
all votes entitled to be cast by  stockholders at meetings or by consent without
a meeting. As a result, Mr. Roach controls the Company.

                                       10

<PAGE>

Potential Issuances of Shares.

   
         In  addition  to  the  20,649,945   shares  of  Class  A  Common  Stock
outstanding  on June 30,  1998,  the  Company had  12,407,362  shares of Class A
Common Stock reserved for future issuance as follows:  (i) 1,775,500 shares were
reserved for issuance upon  conversion of Class B Common Stock,  (ii)  2,791,750
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,  (iii)
2,000,000  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 854,250 shares,  at exercise prices ranging from
$1.52 to $5.25 per share,  were  outstanding,  (iv) 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 120,000 shares,  at exercise prices ranging from $1.00
to $6.75 per share,  were  outstanding,  (v) 601,864  shares were  reserved  for
issuance upon conversion of the $500,000 in principal amount of the Company's 8%
Convertible  Debentures  due  October  13,  1998,  which are  convertible  (with
interest from the  respective  dates 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,  (vi)
4,000,000  shares were reserved for issuance upon  conversion of the  Debentures
and 261,228 shares were reserved for issuance upon exercise of the Warrants (see
"Selling Stockholders" for information  concerning the Debentures,  the Warrants
and the private placement in which the Debentures and the Warrants were issued),
and (vii)  489,520  shares were  reserved  for issuance  upon  exercise of other
warrants and options issued to  unaffiliated  third parties (at exercise  prices
ranging from $2.25 to $5.76 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 of Directors does not intend to declare any dividends in the
foreseeable  future,  but  intends to retain all  earnings,  if any,  for use in
Company's business operations.  The Company has agreed not to establish a record
date for the payment of dividends at any time that at least  $400,000  principal
amount of  Debentures  are  outstanding.  Furthermore,  as the  Company  will be
required  to obtain  additional  financing,  it is  likely  that  there  will be
additional restrictions on the Company's ability to declare any dividends.

Shares Eligible For Future Sale.

         At June 30,  1998,  the  Company  had  outstanding  22,425,445  shares,
consisting of 20,649,945  shares of Class A Common Stock and 1,775,500 shares of
Class B Common Stock (which are convertible into Class A Common Stock on a share
for share basis).  Of such shares,  approximately  19,156,368  shares of Class A
Common Stock are presently freely  transferable  without  restriction  under the
Securities Act.

         Of the remaining 3,269,077  outstanding shares (including the 1,775,500
shares  of Class A  Common  Stock  issuable  upon  conversion  of Class B Common
Stock), (i) 490,827 shares are "restricted securities" that were acquired by the
holders thereof between February 1997 and May 1998 and (ii) 2,778,250 shares are
held by persons who may be deemed to be "affiliates" of the Company,  310,000 of
which are "restricted securities"

                                       11

<PAGE>

   
acquired  by the holders  thereof  between  November  1997 and June 1998 and the
balance of which were acquired more than two years ago or were acquired pursuant
to a registration  statement  under  Securities Act. Rule 144 promulgated by the
Commission under the Securities Act ("Rule 144"), provides, in general, that all
persons (including affiliates) who have satisfied a one year holding period with
respect to "restricted  securities",  as well as affiliates  with respect to all
other  securities  held by them,  may,  subject  to the  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 two year holding period.  The latter provision
is applicable as to all 601,864 shares that may be issued upon conversion of the
Company's 8% Convertible  Debentures  issued in October 1995.  "Affiliates"  are
persons who control,  are  controlled  by or are under  common  control with the
Company.

         The 4,261,228 Shares covered by this Prospectus, when issued, will also
be freely  transferable  without restriction under the Securities Act subject to
applicable Prospectus delivery  requirements.  In addition,  all shares issuable
upon the exercise of options  under the  Company's  stock option plans have been
registered   under  the  Securities  Act  for  issuance  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  tradable upon  issuance.  The Company has also  registered  under the
Securities  Act for resale (i) 5,000  shares of Class A Common  Stock  issued in
June 1996 and 25,000 shares of Class A Common Stock subject to an option held by
a former  consultant,  (ii) 398,406 of the  "restricted  shares" issued in April
1998 and (iii) 100,000 shares of Class A Common Stock subject to options held by
another former  consultant.  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/NMS  in order  for its  Class A Common  Stock to  continue  to be  quoted
thereon.  Among other things, as such requirements  pertain to the Company,  the
Company is  required to  maintain  an  adjusted  tangible  net worth of at least
$4,000,000  and its Class A Common Stock must have an aggregate  market value of
shares held by persons other than officers and directors  ("public float") of at
least  $5,000,000,  a minimum bid price of at least $1.00 per share and at least
400 persons who own at least 100 shares. These requirements are similar to those
that are required  for the Class A Common Stock to be eligible for  inclusion on
Nasdaq's  Small Cap Market.  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.

                                       12

<PAGE>



                                 USE OF PROCEEDS

         The Company will not receive any  proceeds  from the sale of the Shares
by the Selling  Stockholders.  However, the Company received $4,000,000 from the
sale of the  Debentures  on May 20, 1998.  The net proceeds from the sale of the
Debentures,  approximately  $3,744,000,  are being used by the  Company  for the
marketing and development of products, possible acquisitions and general working
capital.  Although  the Company is  considering  acquisitions  and is  currently
engaged in various stages of discussions with regard to potential  acquisitions,
the  Company is not  presently  a party to any  commitment  with  respect to any
acquisition.  The  Company  will  receive  $1.9141  per share to the  extent the
holders of the  Warrants  elect to exercise  the  Warrants,  or an  aggregate of
$500,000 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 proceeds
from the exercise of the Warrants  (before giving effect to the expenses of this
offering, estimated at $20,000) will be used by the Company for working capital.

                              SELLING STOCKHOLDERS

         The following table sets forth  information,  as at June 30, 1998, with
respect to (i) each Selling Stockholder's  beneficial ownership of the Company's
Common Stock prior to the offering of any Shares  hereunder,  (ii) the number of
Shares which may be offered for sale hereunder and (iii) the number of shares of
the  Company's  Class A Common  Stock to be  beneficially  owned by each Selling
Stockholder  after the offering  (assuming  the sale of all Shares being offered
hereunder):
<TABLE>


                                                       Shares of                                      Shares of                    
                                                        Class A                                        Class A                    
                                                     Common Stock                 Shares            Common Stock                  
                                                     Beneficially                 to be             Beneficially                  
                Name of Selling                       Owned Prior                Offered             Owned After                  
                  Stockholder                       to Offering(1)             Hereunder(1)          Offering(2) 
                  -----------                       --------------             ------------         -----------

<S>                                                   <C>                       <C>                       <C>
AGR Halifax Fund Limited                              3,195,920                 3,195,920                 0
Heracles Fund                                           639,184                   639,184                 0
Themis Partners, L.P.                                   426,124                   426,124                 0
                                                ------------------       ----------------------     ------------
                                                      4,261,228                 4,261,228                 0
</TABLE>

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

(1) The number of Shares of Class A Common  Stock  Beneficially  Owned  Prior to
Offering and the number of Shares to be Offered  Hereunder  with respect to each
Selling  Stockholder  is equal to (i)  4,000,000  (the maximum  number of Shares
issuable  to  all  Selling  Stockholders  upon  conversion  of  the  Debentures,
including any accrued interest which the Company may elect to pay in Shares,  as
discussed  below) divided by the  percentage of the Debentures  acquired by such
Selling Stockholder (although the actual number of Shares which



                     (footnotes continued on following page)
                                       13

<PAGE>



may be acquired by a particular Selling  Stockholder and sold hereunder may vary
therefrom)  plus (ii) the maximum number of Shares issuable upon exercise of the
Warrants held by such Selling Stockholder.  The actual number of shares issuable
at any time upon conversion of the Debentures and available for resale hereunder
is determined by a conversion  formula  described below which is based, in part,
on the market price of the Company's  Class A Common Stock  determined as of the
date of conversion and, therefore,  cannot be determined on the date hereof. The
Selling  Stockholders have agreed not to convert Debentures or exercise Warrants
in excess of that number of Debentures and/or Warrants which, upon giving effect
to such  conversion or exercise,  would cause the aggregate  number of shares of
the Company's Class A Common Stock beneficially owned by the Selling Stockholder
and its  affiliates  to exceed 4.9% of the  outstanding  shares of the Company's
Class A Common Stock after such  conversion  or exercise;  except that a Selling
Stockholder may waive the 4.9% restriction on its and its affiliates  beneficial
ownership upon at least sixty-one days' prior written notice to the Company.

(2)      Assumes the sale of all the Shares; See "Plan of Distribution."

         On May 20,  1998,  the  Company  completed a private  placement  to the
Selling Stockholders of an aggregate of $4,000,000 of 5% Convertible  Debentures
due May 20, 2001 (the  "Debentures") and three series of Warrants to purchase up
to an aggregate  of 261,228  shares of the  Company's  Class A Common Stock (the
"Warrants").  The Shares are issuable  upon  conversion  of the  Debentures  and
exercise of the Warrants.

         The Debentures become convertible to the extent of 25% of the principal
amount thereof  commencing on September 17, 1998,  with an additional 25% of the
principal amount of the Debentures becoming first convertible on each of October
17,  1998,  November  16,  1998 and  December  16, 1998  (subject  to  potential
acceleration  in  certain  instances)  at a  conversion  price  equal to 87% (if
converted  before  November 17, 1998),  86% (if converted from November 17, 1998
through February 14, 1999), 85% (if converted from February 15, 1999 through May
20, 1999) or 84% (if converted after May 20, 1999), respectively, of the average
of the closing  bid prices of the  Company's  Class A Common  Stock for the five
consecutive  trading days  immediately  preceding  the date of conversion of the
Debentures (the "Variable  Conversion  Price");  provided,  however,  that in no
event may the conversion price be greater than $1.9375 per share, which was 125%
of such  average  price  over the five  consecutive  trading  days  prior to the
completion of the private placement (the "Fixed Conversion Price").  Interest on
the Debentures is payable only on maturity, conversion, redemption or when other
payment is made on the Debentures, at which time interest is payable in cash or,
if  registered  for resale  under the  Securities  Act of 1933,  as amended (the
"Securities Act"), in shares of the Company's Class A Common Stock valued at the
applicable Debenture conversion price. Any Debenture outstanding on May 20, 2001
will be  automatically  converted into Class A Common Stock of the Company as of
that date.  In  addition,  the  Company may require  conversion  of  outstanding
Debentures  after May 20,  2000 if the  closing  bid price of its Class A Common
Stock  on the  trading  day  immediately  preceding  its  giving  of  notice  of
conversion to Debenture  holders is at least  $3.0625.  In the event the Company
would be  required  to issue  more than  4,000,000  shares of its Class A Common
Stock upon conversion of all of the Debentures  (the  "Conversion  Limit"),  the
Company will have the option of: (i) issuing  additional  shares of Common Stock
if  stockholder  approval has been  obtained or if  stockholder  approval is not
required in order to comply with  applicable  rules of the market upon which its
Class A Common  Stock is traded or (ii)  paying  cash to the holder in an amount
equal to the principal amount of Debentures being converted plus an amount equal
to the number of shares of Class A Common Stock that would be otherwise issuable
upon  conversion  of the  Debentures  multiplied by the  difference  between the
highest sales price of the Company's  Common Stock on the date of conversion and
the applicable  Debenture  conversion  price.  In the event of a merger or other
business  combination  or  corporate  reorganization  as a result  of which  the
stockholders of the Company  immediately prior thereto own in the aggregate less
than  50% of the  voting  power  of the  ultimate  parent  resulting  from  such
transaction or the Company  transfers all or substantially  all of its assets to
another person, then the
                                       14

<PAGE>



Debenture  holders may  participate  in such  transaction as a class on the same
basis as if the Debentures had been converted.  In the event a purchase,  tender
or  exchange  offer is made and  accepted by the holders of more than 50% of the
voting  power of all  outstanding  shares  of  Common  Stock  immediately  prior
thereto,  the holders of the Debentures  are entitled to redeem any  outstanding
Debentures at a redemption price equal to 115% of the then outstanding principal
amount of the Debentures plus accrued interest on the Debentures.

         In connection with the sale and issuance of the Debentures, the Company
also issued to the Selling  Stockholders  the Warrants in series  entitling  the
Selling Stockholders to purchase,  at an exercise price of $1.9141 per share, an
aggregate of (a) 65,307 shares of the Company's Class A Common Stock at any time
to and  including  May 19,  2002 upon the  exercise of Series WA  Warrants,  (b)
65,307  shares  of the  Company's  Class A  Common  Stock  (subject  to pro rata
reduction  with respect to the Series WB Warrants held by a Selling  Stockholder
to the extent the original  principal  amount of the  Debentures  issued to such
Selling  Stockholders  is not  outstanding on the day such Warrant becomes first
exercisable)  at any time  between  November 20, 1998 and November 19, 2002 upon
the  exercise of Series WB  Warrants,  and (c) 130,614  shares of the  Company's
Class A Common Stock  (subject to pro rata  reduction with respect to the Series
WC Warrants held by a Selling  Stockholder to the extent the original  principal
amount of the Debentures issued to such Selling  Stockholders is not outstanding
on the day such Warrant is first  exercisable)  at any time between May 20, 1999
and May 19, 2003.

         The  Debentures  and  the  Warrants   contain   various   anti-dilution
adjustments,  including,  among other things,  in the event of stock  dividends,
splits  and  combinations,  capital  reorganizations  and,  in the  case  of the
Warrants,  certain  issuances of Class A Common  Stock and various  common stock
equivalents  at an  effective  purchase  price per share  which is less than the
exercise price of the Warrants.

         As  compensation  for the placement of the Debentures and the Warrants,
the Company paid Jesup & Lamont Securities  Corporation,  the placement agent, a
commission of $200,000.

         The  Registration  Statement of which this Prospectus  forms a part has
been filed by the Company pursuant to Securities  Subscription  Agreements and a
Registration  Rights  Agreement  entered  into by the  Company  with each of the
Selling  Stockholders  in which the Company has agreed,  among other things,  to
maintain the  Registration  Statement of which this  Prospectus  forms a part in
effect  for,  in  general,  54 months or, if  earlier,  the date when all shares
subject  thereto are sold  pursuant to the  Registration  Statement  or Rule 144
promulgated  under the Securities  Act ("Rule 144"),  or are eligible to be sold
under Rule 144  without  volume or other  limitations.  The  Company may suspend
dispositions of Shares under the Registration Statement of which this Prospectus
forms a part  during a period  not to exceed  thirty  days in any  twelve  month
period if the  Company's  management  determines  in its  reasonable  good faith
judgment that the Company's obligation to ensure that the Registration Statement
is current and  complete  would  require the Company to take  actions that might
reasonably be expected to have a materially  adverse  detrimental  effect on the
Company  and its  stockholders  or there  exists  any fact or event that makes a
statement of a material fact made in the Registration  Statement or incorporated
therein by reference to be untrue in any material respect or requires the making
of  additions  or changes  therein in order to make the  statements  therein not
misleading in any material  respect.  In the event of any such  suspension,  the
maturity  date of the  Debentures is to be extended by 1-1/2 times the number of
days of such  suspension and, if such  thirty-day  period is exceeded,  then the
interest  rate on all  Debentures  will be  permanently  increased  by 200 basis
points for each of the first three  thirty-day  periods and 100 basis points for
each additional 30-day period that such suspension continues. If such suspension
continues for more than an aggregate of 120 days in any 360-day period,  holders
of Debentures will be entitled to require the Company to redeem their Debentures
at a redemption price equal to 130% of the outstanding principal amount thereof,
plus accrued interest  thereon.  All expenses of registration are to be borne by
the Company, other than underwriting
                                       15

<PAGE>



discounts and selling commissions,  and fees and expenses of counsel employed by
the Selling  Stockholders  in excess of $5,000,  which are the obligation of the
Selling  Stockholders.  The  Company has also  agreed to  indemnify  the Selling
Stockholders and certain related persons against certain liabilities,  including
liabilities  under the  Securities  Act,  in  certain  instances  related to the
Registration Statement.

         The foregoing is a brief  description of the Debentures,  the Warrants,
the Securities  Subscription  Agreements and the Registration  Rights Agreement,
copies or forms of which are  exhibits to the  Registration  Statement  of which
this Prospectus forms a part. The foregoing  descriptions thereof do not purport
to be  complete  and are  qualified  in  their  entirety  by  reference  to such
exhibits.
                              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,  directly or through  underwriters or directly to other  purchasers or
through  broker-dealers  in one or  more  market  transactions,  in one or  more
private transactions or in a combination of such methods of sale, at prices then
prevailing,  at prices  related to such  prices or at  negotiated  prices.  Such
methods of distribution may include,  without  limitation,  (a) a block trade in
which the  broker-dealer so engaged will attempt to sell the Shares as agent but
may position and resell a portion of the block as a principal to facilitate  the
transaction;  (b) purchases by a broker-dealer as a principal and resale by such
broker-dealer  for its own account  pursuant to the  Registration  Statement  of
which  this  Prospectus  is a part;  (c)  ordinary  brokerage  transactions  and
transactions  in which the  broker  solicits  purchasers;  and (d)  face-to-face
transactions  between  sellers and purchasers  without a broker or dealer.  This
Prospectus  may be  amended  and  supplemented  from time to time to  describe a
specific  plan of  distribution.  In addition,  any Common Stock covered by this
Prospectus  that so  qualifies  may be sold under Rule 144.  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.  The  registration of
the Shares  under the  Securities  Act shall not be deemed an  admission  by the
Selling   Stockholders  or  the  Company  that  the  Selling   Stockholders  are
underwriters for purposes of the Securities Act of any Shares offered under this
Prospectus.

                                  LEGAL MATTERS

         The  validity  of the Shares has been  passed  upon for the  Company by
Parker Chapin Flattau & Klimpl, LLP, 1211 Avenue of the Americas,  New York, New
York 10036.

                                     EXPERTS

   
         The audited consolidated  financial  statements,  including the related
notes thereto, 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 report with respect thereto,  and are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in accounting and auditing in giving said reports.
    
                                       16

<PAGE>
========================================  ======================================

     No  dealer,  salesman  or any other                 4,261,228 Shares       
person has been  authorized  to give any                                        
information     or    to    make     any                                        
representations    other    than   those                                        
contained  in  this   Prospectus   or  a      American Biogenetic Sciences, Inc.
supplement   to   this   Prospectus   in                                        
connection  with the offering  described                                        
herein,  and,  if given  or  made,  such                                        
information or representations  must not             Class A Common Stock       
be relied upon as having been authorized                                        
by   the    Company   or   the   Selling                                        
Stockholders.  Neither  this  Prospectus                                        
nor any  supplement  to this  Prospectus                                        
constitutes   an  offer  to  sell  or  a                ____________________    
solicitation  of an  offer  to  buy  any                                        
securities other than those specifically                     PROSPECTUS         
offered  hereby  or  of  any  securities                _____________________   
offered   hereby  in  any   jurisdiction                                        
where,  or to any person to whom,  it is       
unlawful    to   make   an    offer   or
solicitation.  Neither  the  delivery of
this  Prospectus  nor any  supplement to
this   Prospectus   nor  any  sale  made
hereunder      shall,      under     any
circumstances,   create  an  implication
that the  information  herein or therein
is correct as of any time  subsequent to
its date.

   
                 ---------------------
                                                         August 7, 1998
                   TABLE OF CONTENTS
                 ---------------------
    

                                    Page

Available Information..............   2
Incorporation of Certain Documents
     by Reference..................   2
The Company........................   3
Risk Factors.......................   4
Use of Proceeds....................  13
Selling Stockholders...............  13
Plan of Distribution...............  16
Legal Matters......................  16
Experts............................  16

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

<PAGE>


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution

      Set  forth  below  is an  estimate  of the fees and  expenses  payable  in
connection  with the  proposed  offering of the Shares which will be paid by the
Company.


SEC Registration Fee................................      $  1,561.23
Accounting Fees and Expenses........................         3,500.00*
Legal Fees and Expenses.............................        12,500.00*
Miscellaneous.......................................         2,438.77*
                                                           -----------
    TOTAL...........................................      $ 20,000.00*
                                                           -----------

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

* Estimated

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 fullest 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
                                                     
                                      II-1

<PAGE>



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 each Selling  Stockholder,  the Company has agreed to indemnify  and
hold harmless the Selling Stockholder,  its officers, directors and partners and
each person  controlling  such  Selling  Stockholder  (within the meaning of the
Securities  Act) and each  underwriter,  if any, and each person who so controls
any underwriter against all, claims, losses, damages and liabilities (or actions
in  respect  thereof)  arising  out of or based upon any  untrue  statement  (or
alleged  untrue  statement)  of a material  fact  contained in the  Registration
Statement  (including  any  prospectus  or other  document  incident to any such
registration or related  qualification or compliance with state securities laws)
or based on any omission (or alleged  omission) to state therein a material fact
required to be stated  therein or necessary to make the  statements  therein not
misleading  or any violation by the Company of the  Securities  Act or any state
securities  law,  relating to any action or inaction  required by the Company in
connection  with any such  registration,  qualification  or  compliance,  and to
reimburse  each  such  indemnified  person  for any  legal  and  other  expenses
reasonably  incurred in  connection  with  investigating  and defending any such
claim, loss, damages,  liabilities or action; provided that the Company will not
be liable in any such case to the  extent  that any such  claim,  loss,  damage,
liabilities  or expense  arises out of or is based on any  untrue  statement  or
omission (or alleged untrue  statement or omission) made in reliance upon and in
conformity with written information  furnished to the Company by any indemnified
person stated to be specifically  for use in the  Registration  Statement (as to
which the  Selling  Stockholders  have  agreed to  indemnify  the  Company,  its
officers  and  directors  and each  person  who  controls  the  Company  or such
Underwriter).

         The  Company  has  purchased a Directors  and  Officers  Liability  and
Reimbursement  policy that covers certain  liabilities of directors and officers
of the  Company  arising  out of claims  based upon acts or  omissions  in their
capacities as directors and officers.
    



                                      II-2

<PAGE>



Item 16.  Exhibits


Exhibit

Number


3.1            Restated  Certificate of  Incorporation  of the Company (filed as
               Exhibit 4.01 to the Company's Registration Statement on Form S-8,
               File No. 333-09473).*

3.2            Amended and  Restated  By-Laws of the  Company  (filed as Exhibit
               4.02 to the  Company's  Registration  Statement on Form S-8, File
               No. 333-09473).*

4.1            Form of the Company's 5% Convertible Debentures (filed as Exhibit
               4.1 to the  Company's  Current  Report on Form 8-K dated (date of
               earliest event reported) May 20, 1998, File No. 0-19041).*5      

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

   
23.1           Consent of Arthur Andersen LLP.+
    

23.2           Consent of Parker  Chapin  Flattau & Klimpl,  LLP  (contained  in
               Exhibit 5).**

24             Power  of  Attorney   (contained   on  Signature   Page  of  this
               Registration Statement).**

99.1           Form of Securities Subscription Agreement between the Company and
               each of the Selling  Stockholders  (filed as Exhibit  99.1 to the
               Company's  Current  Report  on Form 8-K dated  (date of  earliest
               event reported) May 20, 1998, File No. 0-19041).*

99.2           Registration Rights Agreement between the Company and each of the
               Accredited  Selling  Stockholders  (filed as Exhibit  99.2 to the
               Company's  Current  Report  on Form 8-K dated  (date of  earliest
               event reported) May 20, 1998, File No. 0-19041).*

99.3(a)        Form of the  Company's  Series WA  Warrant  issued to each of the
               Selling  Stockholders  (filed as Exhibit 99.3(a) to the Company's
               Current  Report  on  Form  8-K  dated  (date  of  earliest  event
               reported) May 20, 1998, File No. 0-19041).*

99.3(b)        Form of the  Company's  Series WB  Warrant  issued to each of the
               Selling  Stockholders  (filed as Exhibit 99.3(b) to the Company's
               Current  Report  on  Form  8-K  dated  (date  of  earliest  event
               reported) May 20, 1998, File No. 0-19041).*

99.3(c)        Form of the  Company's  Series WC  Warrant  issued to each of the
               Selling  Stockholders  (filed as Exhibit 99.3(c) to the Company's
               Current  Report  on  Form  8-K  dated  (date  of  earliest  event
               reported) May 20, 1998, File No. 0-19041).*

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

* Not filed herewith.  In accordance  with Rule 411 promulgated  pursuant to the
Securities  Act of  1933,  as  amended,  reference  is  made  to  the  documents
previously  filed  with the  Commission,  which are  incorporated  by  reference
herein.

   
**       Filed with initial filing of this Report.

+        Filed herewith.
    

                                      II-3

<PAGE>



Item 17.  Undertakings

        (a)     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;

                     (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;

                     (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 this Registration Statement;

                Provided,  however,  that paragraphs (a)(1)(i) and (a)(1)(ii) do
                not  apply  if 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 Section 15(d) of the Securities Exchange Act of 1934 that are
                incorporated by reference in this Registration Statement.

                (2) That, for the purpose of determining any liability under the
Securities  Act,  each  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 the 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.

         (b) The undersigned  Registrant hereby undertakes that, for purposes of
determining  any  liability  under  the  Securities  Act,  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 the
Registration  Statement  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.

         (c)  Insofar  as  indemnification  for  liabilities  arising  under the
Securities Act may be permitted to directors,  officers and controlling  persons
of the  Registrant  pursuant to the  Registrant's  By-Laws,  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,  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  Securities
Act and will be governed by the final adjudication of such issue.


                                      II-4

<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 amendment to
the  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
6th day of August, 1998.
    


                                   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
amendment to the  Registration  Statement has been signed below by the following
persons in the capacities indicated on the 6th day of August, 1998.
    

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

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

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

/s/Gustav Victor Rudolph Born*
- ------------------------------
Gustav Victor Rudolph Born                    Director

/s/Ellena M. Byrne*
- ------------------------------
Ellena M. Byrne                               Director

/s/Joseph C. Hogan*
- ------------------------------
Joseph C. Hogan                               Director

/s/Stephen H. Ip*
- ------------------------------
Stephen H. Ip                                 Director

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

/s/William G. Sharwell*
- ------------------------------
William G. Sharwell                           Director


  *By:/s/Josef C. Schoell
- ------------------------------
         Josef C. Schoell,

         Attorney-in-fact    
            
       
                                      II-5

<PAGE>



                                  EXHIBIT INDEX

Exhibit
Number

3.1           Restated  Certificate  of  Incorporation  of the Company (filed as
              Exhibit 4.01 to the Company's  Registration Statement on Form S-8,
              File No. 333-09473).*

3.2           Amended and Restated By-Laws of the Company (filed as Exhibit 4.02
              to the  Company's  Registration  Statement  on Form S-8,  File No.
              333-09473).*

4.1           Form of the Company's 5% Convertible  Debentures (filed as Exhibit
              4.1 to the  Company's  Current  Report on Form 8-K dated  (date of
              earliest event reported) May 20, 1998, File No. 0-19041).*5     

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

   
23.1          Consent of Arthur Andersen LLP.+
    

23.2          Consent  of Parker  Chapin  Flattau & Klimpl,  LLP  (contained  in
              Exhibit 5).**

   
24            Power  of  Attorney   (contained   on   Signature   Page  of  this
              Registration Statement).+
    

99.1          Form of Securities  Subscription Agreement between the Company and
              each of the  Selling  Stockholders  (filed as Exhibit  99.1 to the
              Company's Current Report on Form 8-K dated (date of earliest event
              reported) May 20, 1998, File No. 0-19041).*

99.2          Registration  Rights Agreement between the Company and each of the
              Selling  Stockholders  (filed  as  Exhibit  99.2 to the  Company's
              Current Report on Form 8-K dated (date of earliest event reported)
              May 20, 1998, File No. 0-19041).*

99.3(a)       Form of the  Company's  Series  WA  Warrant  issued to each of the
              Selling  Stockholders  (filed as Exhibit  99.3(a) to the Company's
              Current Report on Form 8-K dated (date of earliest event reported)
              May 20, 1998, File No. 0-19041).*

99.3(b)       Form of the  Company's  Series  WB  Warrant  issued to each of the
              Selling  Stockholders  (filed as Exhibit  99.3(b) to the Company's
              Current Report on Form 8-K dated (date of earliest event reported)
              May 20, 1998, File No. 0-19041).*

99.3(c)       Form of the  Company's  Series  WC  Warrant  issued to each of the
              Selling  Stockholders  (filed as Exhibit  99.3(c) to the Company's
              Current Report on Form 8-K dated (date of earliest event reported)
              May 20, 1998, File No. 0-19041).*

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

* Not filed herewith.  In accordance  with Rule 411 promulgated  pursuant to the
Securities  Act of  1933,  as  amended,  reference  is  made  to  the  documents
previously  filed  with the  Commission,  which are  incorporated  by  reference
herein.

   
**       Filed with initial filing of this Report.

+        Filed herewith.                                                        
    

                                      II-6





                                                                   EXHIBIT 23.01

                    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 18, 1998,
included in American  Biogenetic  Sciences,  Inc.'s Form 10-K for the year ended
December  31,  1997,  and to  all  references  to  our  firm  included  in  this
Registration Statement.

   
                                                   Arthur Andersen LLP
Melville, New York
August 6, 1998
    


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