AMERICAN BIOGENETIC SCIENCES INC
S-3, 1998-12-24
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
Previous: FIRST KEYSTONE FINANCIAL INC, DEF 14A, 1998-12-24
Next: INSURED MUNICIPALS INCOME TRUST 86TH INSURED MULTI SERIES, 485BPOS, 1998-12-24




As filed with the Securities and Exchange Commission on December 24, 1998

                                                    Registration No. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                           --------------------------

                                    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. [ ]

<PAGE>
<TABLE>
<CAPTION>

                         CALCULATION OF REGISTRATION FEE


                                                           Proposed              Proposed                          
                                                           Maximum                Maximum             Amount of
        Title of Each Class              Amount to be      Offering Price     Aggregate Offering      Registration
  of Securities to be Registered         Registered        per Share (1)         Price                 Fee
- ------------------------------------------------------------------------------------------------------------------  
<S>                                   <C>              <C>                   <C>                  <C>      
Class A Common Stock, $.01 par  
value per share....................      10,800,000       $0.85937              $9,281,196           $2,580.17
Total Registration Fee...............................................................................$2,580.17

</TABLE>

(1)      Represents  the shares of Class A Common  Stock  being  registered  for
         resale by the Selling Stockholders. Estimated solely for the purpose of
         calculating  the  registration  fee  pursuant  to  Rule  457(c)  of the
         Securities Act of 1933, as amended, based on the average of the bid and
         asked price on the Nasdaq National Market on December 21, 1998.

         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>

The  information  in this  Prospectus  is not  complete.  We may not sell  these
securities  until the  Registration  Statement  filed  with the  Securities  and
Exchange Commission is effective. This Prospectus is not an offer to sell nor is
it seeking an offer to buy these securities in any State where the offer or sale
is not permitted.

SUBJECT TO COMPLETION, DATED DECEMBER 24, 1998

PROSPECTUS
- ----------
                                10,800,000 Shares

                       American Biogenetic Sciences, Inc.

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

         The stockholders of American Biogenetic  Sciences,  Inc. listed on page
15 of this Prospectus are offering for sale 10,800,000  Shares of Class A Common
Stock of the Company under this Prospectus.  This Prospectus may also be used by
those to whom such Selling  Stockholders  may pledge,  donate or transfer  their
Shares and their other  successors  in interest.  We issued all of the Shares to
the Selling Stockholders in a private placement transaction in October 1998.

         The Selling  Stockholders  may offer  their  Shares  through  public or
private  transactions,  at prevailing market prices, or at privately  negotiated
prices. See "Plan of Distribution" on page 17.

         The Selling  Stockholders will receive all of the net proceeds from the
sale of the  Shares.  Accordingly,  we will not receive  any  proceeds  from the
resale of the  Shares.  We have  agreed  to bear the  expenses  incident  to the
registration of the Shares, other than selling discounts and commissions.

         Our Class A Common  Stock is  currently  quoted on the Nasdaq  National
Market under the symbol  "MABXA." On December 23, 1998,  the closing  price of a
share of our Class A Common  Stock on the Nasdaq  National  Market was  $.78125.
Because the market price of a share of Class A Common Stock has been below $1.00
and certain  other  factors,  we cannot assure you that our Class A Common Stock
will  continue  to be quoted on  Nasdaq.  See "Risk  Factors - No  Assurance  of
Continued Nasdaq Listing," on page 5.

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


This investment  involves a high degree of risk. You should  carefully  consider
the factors  described  under the caption "risk factors"  beginning on page 5 of
this Prospectus.

Neither  the  Securities  and  Exchange  Commission  nor  any  state  securities
commission has approved or disapproved these  securities,  or determined if this
Prospectus  is truthful or  complete.  Any  representation  to the contrary is a
criminal offense.

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

                   The date of this Prospectus is ______, 1999
<PAGE>



                  WHERE YOU CAN FIND MORE INFORMATION ABOUT US

         We file annual,  quarterly and special  reports,  proxy  statements and
other  information  with the SEC.  You may read and copy any document we file at
the SEC's public  reference  rooms in  Washington,  D.C., New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further information
on the public  reference rooms. Our SEC filings are also available to the public
over the Internet at the SEC's Website at "http://www.sec.gov."

         We have  filed  with the SEC a  registration  statement  on Form S-3 to
register the Shares being offered.  This Prospectus is part of that registration
statement  and,  as  permitted  by the SEC's  rules,  does not  contain  all the
information included in the registration statement. For further information with
respect to us and our Class A Common Stock, you should refer to the registration
statement and to the exhibits and schedules  filed as part of that  registration
statement,  as well as the documents we have incorporated by reference which are
discussed  below.  You can  review  and copy  the  registration  statement,  its
exhibits  and  schedules,  as well as the  documents  we  have  incorporated  by
reference, at the public reference facilities maintained by the SEC as described
above. The  registration  statement,  including its exhibits and schedules,  are
also available on the SEC's web site.

         This Prospectus may contain  summaries of contracts or other documents.
Because they are summaries,  they will not contain all of the  information  that
may be important to you. If you would like complete information about a contract
or  other  document,  you  should  read  the copy  filed  as an  exhibit  to the
registration   statement  or  incorporated  in  the  registration  statement  by
reference.

         The SEC allows us to "incorporate by reference" the information we file
with them,  which means that we can  disclose  important  information  to you by
referring you to those documents.  The information  incorporated by reference is
an important part of this  Prospectus,  and information  that we file later with
the SEC will automatically update or supersede this information.  We incorporate
by reference the documents listed below and any future filings we will make with
the SEC under Sections 13(a),  13(c), 14 or 15(d) of the Securities Exchange Act
of 1934 (File No. 0-19041) until all of the Shares are sold:

          o       Annual Report  on Form  10-K for  the  year ended December 31,
                  1997;

          o       Quarterly  Reports on Form 10-Q for the fiscal  quarters ended
                  March 31,  1998 (and  amendments  thereto),  June 30, 1998 and
                  September 30, 1998;

          o       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

          o       The  description of our Class A Common Stock  contained in the
                  Registration Statement on Form 8-A filed on February 26, 1991,
                  including  all  amendments or reports filed for the purpose of
                  updating such description.

     You may  request  a copy of  these  filings,  at no  cost,  by  writing  or
telephoning us at the following address:

                                            Chief Financial Officer.
                                            American Biogenetic Sciences, Inc.
                                            1375 Akron Street
                                            Copiague, New York 11726
                                            (516) 789-2600

                                      - 2 -

<PAGE>

                               PROSPECTUS SUMMARY

     This summary  highlights some information from this Prospectus.  It may not
contain all of the  information  important to you. To  understand  this offering
fully and get a better understanding of our business and operations,  you should
read the  entire  Prospectus  carefully,  including  the risk  factors,  and the
documents we have  incorporated  by reference in the section "Where You Can Find
More Information About Us."

     Please note that references in this Prospectus to "we," "our" or "us" refer
to American Biogenetic Sciences,  Inc. and our subsidiary,  Stellar Bio Systems,
Inc., not to the Selling Stockholders.

                                   The Company

         We are engaged in researching,  developing and marketing cardiovascular
and neurobiology products for commercial development. Product sales began during
the last quarter of 1997.

         Certain of our  products  are  designed  to be used for in vivo,  while
others are  designed for in vitro,  diagnostic  procedures.  In vivo  diagnostic
procedures  are those in which certain cells or organisms are injected  directly
into the body or  bloodstream  to assess a  particular  reaction  of the  living
cells.  During in vitro  procedures,  blood or tissue is extracted from the body
and the  diagnostic  tests  are  performed  in a test  tube or other  laboratory
equipment.

         Our products include:

         o    Thrombus  Precursor  Protein  (TpP(TM))  test. This is an in vitro
              diagnostic  test  used to  assess  the risk of  active  thrombosis
              (blood clots) in the veins or arteries.  This test is also used to
              monitor the performance of anticoagulent  (anti-clotting)  therapy
              or drugs used in the prevention of blood clots.

         o    Functional Intact  Fibrinogen  (FiF(TM)) test. This is an in vitro
              diagnostic  test which measures the levels of fibrinogen in blood.
              Fibrinogen is a protein used in the blood-clotting process.

          These tests assist  doctors in  diagnosing  and  treating  blood clots
lodged deeply in the legs (known as DVT- deep vein  thrombosis)  and blood clots
in the lungs (known as PE - pulmonary embolisms).  Deep vein thrombosis can move
to the lungs and cause pulmonary  embolisms,  which can be fatal.  Thrombosis is
also  associated  with many other  medical  conditions,  such as heart  attacks,
strokes and complicated pregnancies.  The Company is pursuing the application of
its tests in these areas with additional clinical testing.

          We have also developed patented  monoclonal  antibodies called MH1 and
45J which we use in our TpP(TM) test. The 45J  monoclonal  antibody is also used
in our FIF(TM) test. Antibodies are produced in response to substances which are
recognized as foreign by the host.  Our  antibodies  MH1 and 45J were  developed
using our patented  antigen-free  mouse colony. We are evaluating the use of MH1
as an in vivo imaging agent. In this process,  a radioisotope is attached to MH1
which emits a signal enabling  instruments to detect where a thrombolytic (blood
clot) event has occurred  within the body.  We have  completed the United States
Food and Drug Administration's  Phase I/II studies for the use of the MH1 with a
radioisotope  as an imaging agent. We must still complete the FDA's Phase II and
Phase III studies.

         Our products  require  approval  from the FDA prior to marketing in the
United States. Some in vitro diagnostic products are eligible for an accelerated
FDA  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.  To date,  we have  received  Section  510(k)
Pre-Market Clearance from the FDA for our TpP(TM) and FiF(TM) tests. In November
1997, we commenced marketing efforts for the TpP(TM) and FiF(TM) tests.

         On April 23,  1998,  we  purchased  all of the issued  and  outstanding
shares  of common  stock of  Stellar  Bio  Systems,  Inc.,  a  manufacturer  and
distributor of in vitro  diagnostic  products and research  reagents used in 

                                      - 3 -

<PAGE>

the biotechnology industry.  Stellar's in vitro diagnostic products focus on the
infectious disease and auto-immune  disease markets.  Stellar markets a complete
line of  products  to  determine  the immune  status of  numerous  human  herpes
viruses. In addition,  auto-immune  diseases,  such as lupus, are detected using
Stellar's  products.  Stellar is also the  largest  domestic  provider of normal
mouse  serum,  which is used as a test  component  by major in vitro  diagnostic
product manufacturers for a variety of purposes.

         Our  company  was  incorporated  in Delaware  in  September  1983.  Our
principal executive offices are located at 1375 Akron Street, Copiague, New York
11726, and our telephone number at that address is (516) 789-2600.

                                  The Offering


Class A Common Stock being offered by
         the Selling Stockholders........  10,800,000 Shares

Class A Common Stock outstanding after
         this offering...................  35,559,556 Shares

Nasdaq/NMS Symbol........................  MABXA

Use of Proceeds..........................  The Selling Stockholders will receive
                                           all net proceeds from the sale of the
                                           Shares.   Accordingly,  we  will  not
                                           receive any proceeds  from the resale
                                           of the Shares.

                                           We  received  $2,700,000  in proceeds
                                           from  our sale of the  Shares  to the
                                           Selling  Stockholders.  We used  such
                                           funds,  together  with other funds in
                                           our  treasury,   to  repurchase   the
                                           remaining 5%  Convertible  Debentures
                                           and outstanding  Warrants issued in a
                                           private placement in May 1998.

                                           We  have  agreed  to  bear  customary
                                           expenses incident to the registration
                                           of the Shares for the  benefit of the
                                           Selling   Stockholders,   other  than
                                           discounts and commissions.

Risk Factors.............................  The securities offered hereby involve
                                           a high  degree  of risk.  You  should
                                           carefully    consider   the   factors
                                           described  under  the  caption  "risk
                                           factors."

                                      - 4 -

<PAGE>



                                  RISK FACTORS

         Before you buy shares of our Class A Common Stock,  you should be aware
that there are various risks  associated  with such  purchase,  including  those
described below. You should consider carefully these risk factors, together with
all of the other  information  in this  Prospectus,  and the  documents  we have
incorporated  by reference in the section  "Where You Can Find More  Information
About Us" before you decide to purchase shares of our Class A Common Stock.

         Some of the information in this Prospectus and in the documents we have
incorporated  by  reference,  may  contain  forward-looking   statements.   Such
statements can be generally identified by the use of forward-looking  words such
as "may," "will,"  "expect,"  "anticipate,"  "intend,"  "estimate,"  "continue,"
"believe," or other similar words. These statements discuss future expectations,
or state other "forward-looking"  information. When considering such statements,
you should keep in mind the risk factors and other cautionary statements in this
Prospectus.  The risk factors  noted in this section and other  factors noted in
this Prospectus  could cause our actual results to differ  materially from those
contained in any forward-looking statements.

Development Stage Company.

         The Company  remains in the  development  stage.  We have not generated
significant revenues from product sales from our inception through September 30,
1998 and have incurred  losses every year since our  formation in 1983.  Through
September  30, 1998,  we have  received an aggregate of  $1,302,000 in licensing
fees,  royalties and under  collaborative  agreements.  Sales of the TpP(TM) and
FIF(TM) tests,  which commenced  during the fourth quarter of 1997, and sales of
Stellar's  products  since its  acquisition  on April  23,  1998,  have  totaled
$1,003,000 through September 30, 1998.

         While we have  products  at  various  stages  of  development  and have
started  to  generate  revenues,  we cannot  assure you as to if and when we may
begin  generating  significant  revenues  from  product  sales and cease being a
development stage company.

History and Expectation of Future Losses; Accumulated Deficit.

         Our 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.  We have incurred the following
losses since 1994:


Fiscal year ended:
         o  December 31, 1994..................... $7,431,000
         o  December 31, 1995..................... $5,607,000
         o  December 31, 1996..................... $7,700,000
         o  December 31, 1997..................... $7,147,000
Nine months ended:
         o  September 30, 1998.................... $4,572,000

         At  September  30,  1998,  we had  net  worth  of  $4,949,000,  with an
accumulated retained earnings deficit of $53,987,000.  We had $5,695,000 in cash
and cash equivalents at September 30, 1998. We expect to continue to have losses
in the near future.  Our future  profitability  is  dependent,  in part,  on our
ability to:

              o successfully  market our existing products and complete products
                under  development,  
              o obtain  required   regulatory  approvals  and   manufacture  and
                market successfully  such products directly or through partners,
                and
              o acquire products which can be successfully marketed.


                                      - 5 -

<PAGE>



No Assurance of Continued Nasdaq Listing.

         Our Class A Common  Stock is  currently  quoted on The Nasdaq  National
Market. On February 23, 1998, Nasdaq adopted new requirements  which issuers are
required to meet in order to maintain  their  listings.  On September  24, 1998,
Nasdaq issued a letter  indicating  that our Class A Common would be delisted as
of December 28, 1998 unless we complied with the minimum bid  requirement  of $1
for a period of ten  consecutive  trading days.  This  requirement  applies to a
listing on both Nasdaq's  National Market and SmallCap Market.  We provided data
to Nasdaq  which  shows  that our Class A Common  Stock met the $1  minimum  bid
requirement  on each of the twelve  consecutive  trading days from  November 11,
1998 to November 27, 1998. Nevertheless, the Staff of Nasdaq has advised us that
it still  intends  to delist  our Class A Common  Stock.  We have  appealed  the
delisting  decision  by  requesting  a hearing  before  an  Appeals  Panel.  The
delisting  has been stayed  until after the hearing has been held.  To date,  no
hearing date has been set.

         Our stockholders  have authorized our Board of Directors to implement a
reverse  split of our Class A and Class B Common Stock within a range of one new
share to be issued for each four to eight presently  outstanding  shares. We may
be required to implement a reverse  split in order to maintain a Nasdaq  listing
of our Class A Common Stock.

         We are also  required  to  maintain  net  tangible  assets  of at least
$4,000,000 for Nasdaq National Market, but may only need $2,000,000 to be traded
on the Nasdaq SmallCap  Market.  Net tangible assets is total assets  (excluding
goodwill)  minus total  liabilities.  At September  30,  1998,  our net tangible
assets were approximately $4,463,000.

         We cannot  assure you that our Class A Common Stock will continue to be
quoted on Nasdaq.  If we fail to maintain a Nasdaq listing,  our securities will
likely be traded on the OTC Bulletin Board. As a result, the market value of our
Class A Common Stock could decline and  stockholders  may find it more difficult
to dispose of, or to obtain  accurate  quotations as to the market value of, our
Class A Common Stock.

Unproven Products.

         Although we have had recent  sales of our TpP(TM) and FiF(TM)  kits and
products  acquired as part of the acquisition of Stellar,  our existing products
and our  products  under  development  are subject to the risks  inherent in the
development  of  biotechnology  products.  In order to finalize  these and other
future  products for sale, we must complete  further  research,  development and
testing and obtain  regulatory  clearance.  In addition,  we must  calculate the
costs  of large  scale  manufacturing  before  any  products  can  deemed  to be
commercially viable. We are unable to predict with any degree of certainty when,
or if, we will complete the research,  development and testing of products under
development and other future products,  or if completed,  whether we will obtain
required regulatory  approvals.  In addition, we cannot assure you that once our
products are developed, tested and approved, that we will be able to produce our
products in commercial quantities at reasonable costs, that our products will be
acceptable  to the medical  community,  or that our  marketing and sales efforts
will be successful.

Risks in Developing Our Proposed Products

         Our  operations  are  subject to  numerous  risks  associated  with the
development of pharmaceutical products, including the competitive and regulatory
environment  in which we operate.  In addition,  we may encounter  unanticipated
problems,  including  development,  manufacturing,  distribution  and  marketing
difficulties,  some of which may be beyond our financial and technical abilities
to resolve. Accordingly, we cannot assure you that our products will prove to be
commercially viable, or that we will successfully market any products or achieve
significant revenues or profitable operations.

                                      - 6 -

<PAGE>



Need For Additional Financing.

         The  research,   development,   commercialization,   manufacturing  and
marketing of our products will likely require financial resources  significantly
in  excess of those  presently  available  to us.  We intend to seek  additional
financing  which may result in (1)  borrowings  that could affect our results of
operations  and create an  obligation to repay the loans and (2) the issuance of
additional  shares of our  capital  stock  and/or  rights to acquire  additional
shares of our capital stock.  Such additional  issuances of capital would result
in a reduction  of your  percentage  interest in the Company.  Future  issuances
could cause dilution of the interests of the then existing  stockholders  of the
Company.

         We  also  intend  to  continue   to  seek   collaborative,   licensing,
co-marketing or other arrangements with large pharmaceutical  companies or other
third parties to:

          o    provide additional funding and clinical expertise,

          o    perform clinical trials necessary to obtain regulatory approvals,

          o    provide manufacturing expertise, and

          o    market our products.

         These  arrangements  may  result in our  sharing  the  benefits  (i.e.,
royalty  payments) of our 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.

         We  cannot  assure  you  that we will  be  able to  arrange  financing,
collaborative arrangements or other third party arrangements on acceptable terms
necessary to fully develop and commercialize any of our products.

Possible Effects of Acquisition Strategy

         Part of our growth  strategy  involves the acquisition of companies and
product lines which our management may believe could provide synergisms with our
products and operations or otherwise  facilitate  our growth.  In April 1998, we
acquired all of the issued and outstanding shares of common stock of Stellar Bio
Systems,  Inc.,  a  manufacturer  and  distributor  of  diagnostic  products and
research  reagents.  In exchange for the shares of Stellar,  we paid $120,000 in
cash and issued  398,406  shares of our Class A Common  Stock  ($700,000 at then
market value).  We also agreed to a contingent  future payment of up to $650,000
in shares of our Class A Common Stock. The number of shares we may have to issue
depends on the level of  Stellar's  future  revenues and the market price of our
Class A  Common  Stock  at  approximately  the date of  issuance.  To date,  the
acquisition of Stellar has been our only acquisition.

         Any future  acquisition  may require us to borrow 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.  The issuance of equity
could  result  in  substantial  dilution  in the  equity  interest  of  existing
stockholders. Although we are currently engaged in various stages of discussions
with  regard to  potential  acquisitions,  we are not  presently  a party to any
commitment with respect to any acquisition.

         We cannot assure you that (1) we 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 (2) that any  businesses  we
acquire will achieve sales and profitability that justify our investment.

                                      - 7 -

<PAGE>



Integration of Acquisitions.

         The  success of any  acquisition  will  depend in large  measure on our
ability to effectively  integrate the  operations,  management  and  information
systems of the  businesses  we  acquire.  The  process of  integrating  acquired
businesses often involves unforeseen difficulties and may require us to devote a
significant  amount of our  financial  and  other  resources  to such  projects.
Acquisitions  may also  involve a number of  additional  risks,  such as adverse
short-term   effects  on   earnings,   diversion  of   management's   attention,
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 our
business, financial condition and results of operations.

         In addition, to the extent that agreements relating to our acquisitions
provide for reimbursement to us with respect to contingent and other liabilities
of the acquired business, the reimbursement  obligations may be, and in the case
of the  acquisition  of Stellar are, only available for a limited period of time
and are subject to negotiated limitations. Our business, financial condition and
results of operations  could be materially and adversely  effected if any future
claims or liabilities which we may have relating to acquisitions are not subject
to any  reimbursement  obligations,  or if the  amount of claims or  liabilities
exceeds the  limitations or the ability of the sellers of the acquired  entities
to satisfy their reimbursement obligations.

Certain Effects of Government Regulation.

         The  investigation,  manufacture,  exportation,  marketing  and sale of
diagnostic and therapeutic products and vaccines in or from the United States is
subject  to  regulation  by the  Food  and  Drug  Administration,  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, we received a Section 510(k)
Pre-Market Clearance to market our TpP(TM) test as an aid in the risk assessment
of thrombosis and the  monitoring of  anticoagulant  therapy.  We plan to submit
additional  pre-market  notifications  to obtain clearance to market the TpP(TM)
test for  additional  specific  uses. In June 1997, we received  Section  510(k)
Pre-Market  Clearance to market our FiF(TM) diagnostic test for the quantitative
determination of fibrinogen in human blood.

         Obtaining FDA approval and complying with FDA  regulation  with respect
to in vivo  products  (such as certain  proposed uses of our MH1 product) is far
more expensive and time consuming than the costs  associated  with the review of
products  for in vitro  use.  Therefore,  we intend to seek  joint  ventures  or
licensing  arrangements  with respect to our in vivo  products in order to share
the costs  associated  with the regulatory  review and/or approval  process.  We
cannot  provide  any  assurance  that we will be able to  enter  into  any  such
arrangements or that the terms of such agreement will be favorable to us.

         Although we have obtained Pre-Market Clearance for some of our existing
products,  we cannot assure you that any of our future products will be approved
by the FDA or other applicable  foreign  regulatory  agency. Any FDA, foreign or
state  regulatory  approvals or clearances,  once obtained,  can be withdrawn or
modified.  Our inability to obtain and maintain,  any necessary United States or
foreign  clearances or  manufacturing  and marketing  approvals for our products
could have a material  adverse effect on our business,  financial  condition and
results of operations.

                                      - 8 -

<PAGE>



Dependence on Acceptance by Medical Community.

         The commercial  success of our products is  substantially  dependent on
acceptance  and  use  of  our  products  by the  medical  community.  Widespread
acceptance of our products as useful additional tools to diagnosis and treatment
will require  educating  the medical  community  about the  product's  benefits,
reliability and  effectiveness.  In addition,  acceptance of our products may be
adversely  affected by competing products which may be as or more effective than
our products for a specific use.  Accordingly,  we cannot assure you that any of
our products will be accepted by 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 is our  strategy  to seek  arrangements  with  large  pharmaceutical
companies to market our products.  In the event we are unable to enter into such
arrangements in the future or if our  arrangements  are not  successful,  we may
seek to  market  our  products  through  independent  distributors.  Independent
distributors may require us to develop a marketing  program to support sales. In
that event, we may incur additional  expenses for the development of promotional
literature and aides, the hiring of sales  representatives and the completion of
studies in order to promote the interests of  distributors  in our products.  We
cannot assure you that we will be able to develop such marketing arrangements on
satisfactory  terms or that, if necessary,  we would have the working capital to
establish the sales support generally required by independent distributors.

Manufacturing Facilities.

         Although we are  presently  producing a limited  quantity of monoclonal
antibodies  for  testing  and  evaluation  of our in vitro  products,  we cannot
provide  any  assurance  that  we will  able  to  either  finance  or  meet  FDA
regulations for good  manufacturing  practices  required in order to convert and
operate our current facility for the commercial production of these products.

         We do not intend to establish our own manufacturing  operations for our
in vivo products unless and until,  in the opinion of our  management,  the size
and scope of our business and our financial resources so warrant.  Currently, we
have agreements with  manufacturers for the production of each of our antibodies
(MH1 and 45J) and our TpP(TM) and FiF(TM) diagnostic kits.

         We intend to seek  additional  third parties to manufacture our in vivo
monoclonal antibody and other in vivo products, or to 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 our 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.

         We cannot  assure  you that we will be able to  manufacture  sufficient
quantities  of our in vivo  monoclonal  antibody  necessary  to obtain  full FDA
clearance or approval, that the FDA will accept our manufacturing  arrangements,
or that we will  maintain  existing  commercial  manufacturing  arrangements  or
obtain new agreements on acceptable terms.

Patents and Protection of Proprietary Information.

         Our business depends, in part, upon our proprietary technology. We rely
on a combination of trade secret laws,  patents,  trademarks and confidentiality
and  other  contractual  agreements  to  establish,  maintain  and  protect  our
proprietary rights. However, all afford only limited protection.

         We hold fifteen U.S.  patents for various  products and have additional
patent applications  pending with the United States Patent and Trademark Office.
We have also  obtained or applied for  corresponding  patents for certain of the
U.S. patents and patent applications in a limited number of foreign countries.

                                      - 9 -

<PAGE>



         With respect to certain aspects of our  technology,  we rely upon trade
secrets, unpatented proprietary know-how and continuing technological innovation
to protect access to our proprietary  information.  We have  confidentiality and
invention  assignment  agreements  with our employees,  and generally enter into
non-disclosure agreements with our scientific consultants and collaborators. All
members of our Scientific  Advisory Committee are employed by or have consulting
agreements  with third parties,  whose business may conflict or compete with our
business,  and any inventions discovered by such individuals will not become our
property.

         We cannot assure you that our pending patent applications will issue as
patents,  that any issued  patent will provide us with  significant  competitive
advantages or that  challenges  will not be  instituted  against the validity or
enforceability  of any of our patents.  Because  foreign patents may afford less
protection  under foreign law than is available under U.S. patent law, we cannot
assure  that  any  such  patents  issued  to  us  will  adequately  protect  our
proprietary information.  In addition, other companies may independently develop
similar  or  more  advanced  products,  design  patentable  alternatives  to our
products or duplicate our trade  secrets,  and our  employees and  collaborators
could breach their confidentiality agreements. Also, we may be required, in some
cases,  to obtain  licenses  from  third-parties  or to redesign our products or
processes to avoid  infringement.  Any  litigation  by us to seek to protect our
intellectual  property  or  against  us,  would be costly  and could  divert the
efforts and attention of our  management  and technical  personnel,  which could
have a material adverse effect on our business,  financial condition and results
of operations.

         Many  of  our   therapeutic   compounds   are  the  subject  of  patent
applications which we license from various academic institutions.  Such licenses
require us to pay royalties on the sales of products.  We cannot assure you that
these licensed  products will be  commercially  viable or that the licenses will
not be terminated.

Competition; Rapid Technological Changes.

         The  biotechnology  industry is  characterized  by rapid  technological
advances, evolving industry standards and technological obsolescence. Several of
our competitors,  including large  pharmaceutical,  chemical,  biotechnology and
agricultural  concerns,  universities  and  other  research  institutions,  have
financial   resources  and  research  and  development   staffs  and  facilities
substantially  greater than ours. Our competitors may develop products which may
render our products obsolete or which have advantages over our products, such as
greater accuracy and precision or greater  acceptance by the medical  community.
Competing  products may also get through the regulatory  approval process sooner
than our products,  thereby  enabling our  competitors  to market their products
earlier  than we can.  Usually,  the first  person  to  market a  product  has a
significant  marketplace  advantage.  In  addition,  other  products now in use,
presently  undergoing the regulatory  approval process,  or under development by
others,  may perform similar  functions as our existing  products or those under
development.

         Any technical  advisory  issued by our  competitors or our inability to
meet and surpass our competitors'  technological advances, could have a material
adverse effect on our business, financial condition and results of operations.

Retention and Attraction of Key Personnel.

         Our  success  depends to a  significant  extent upon the efforts of (1)
Alfred J. Roach,  the  Chairman of our Board of  Directors  and one of our major
stockholders,  (2) Mr. John S. North, our President and Chief Executive Officer,
and (3) Dr. Emer  Leahy,  our Senior Vice  President-Business  Development.  Mr.
Roach is not subject to any employment agreement.  Our employment agreement with
Mr. North  expires on November 15, 2001 and our  employment  agreement  with Dr.
Leahy  expires on November 30, 2001.  We do not maintain  life  insurance on the
lives of Mr.  Roach,  Mr.  North or Dr.  Leahy.  The loss of the services of Mr.
Roach,  Mr.  North or Dr.  Leahy,  as well as  certain  other  personnel,  could
adversely  affect  our  business  and  prospects.  Because  of the nature of our
business,  our  success is  dependent  upon our  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 ours. We cannot assure you
that we will be successful in recruiting or retaining personnel of the requisite
caliber  or in  adequate  numbers  to  enable us to  conduct  our  business  and
effectively compete in our industry.

                                     - 10 -
<PAGE>



Scientific Advisors to the Company.

         We have a Scientific  Advisory  Committee  which consists of scientific
advisors who serve as  consultants  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 our projects.
In addition,  these  individuals have  employment,  consulting or other advisory
arrangements with other entities.  As a result, their obligations to these other
entities  may  conflict or compete with their  obligations  to us.  Regulations,
corporate  policies or agreements to which these  individuals  are or may become
subject  with  such  other  entities  may limit the  ability  of the  scientific
advisors to continue their relationship with us.

Product Liability; Requirement for Insurance Coverage.

         The testing, marketing and sale of pharmaceutical products carries with
it a risk of product  liability  claims by  consumers  and others.  Instances of
negative reactions by the human immune system to mouse derived antibodies,  such
as those generated from our MH1 antigen-free  mouse colony,  have been reported.
In addition,  product and other liability  claims may be asserted by physicians,
laboratories,  hospitals or patients  relying upon the results of our diagnostic
tests.  Claims may also be  asserted  against  us by end users of our  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 to their purchase of or acceptance
of  products  for   distribution.   Our  failure  to  satisfy  these   insurance
requirements  could  diminish our ability to achieve broad  distribution  of our
products which, in turn, would have a material adverse effect upon our business,
financial condition and results of operations.

         We have  product  liability  insurance  which  covers our  TpP(TM)  and
FiF(TM) products,  but do not maintain product liability  insurance coverage for
our other products. Although we plan to obtain product liability insurance prior
to the marketing of any of our proposed  products,  we cannot assure you that we
will be able to secure such insurance or, that if we can obtain insurance,  that
insurance  can be acquired at a  reasonable  cost or that our existing or future
insurance policies will be sufficient to cover all possible liabilities.  In the
event of any  claim or suit  against  us,  lack or  insufficiency  of  insurance
coverage  could  have a  material  adverse  effect  on our  business,  financial
condition and results of operations.

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  for dividend  payments.  To date,  we have not paid any cash
dividends.  The  payment  of  dividends,  if any,  in the  future is within  the
discretion of our Board of Directors and will depend upon our earnings,  capital
requirements and financial  condition,  and other relevant factors. Our 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 our business operations.

Control By Alfred J. Roach.

         As of December 15, 1998,  Alfred J. Roach, the Chairman of our Board of
Directors,  owned and had the power to vote all 3,000,000  outstanding shares of
our Class B Common Stock and 4,035,250  shares of our Class A Common  Stock,  of
which  4,000,000  shares are covered by this  Prospectus.  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  51.9% of all  votes at  meetings  or by  consent  without a
meeting.  As a result,  Mr. Roach will be able to exercise  significant  control
over the  Company  through  his  ability to  determine  the  outcome of votes of
stockholders regarding, among other things, nomination and election of directors
and approval of significant  transactions.  In addition, Mr. Roach holds options
to purchase an additional  1,160,000 shares of our Class A Common Stock which he
may exercise at any time.
                                     - 11 -

<PAGE>



Dilution; Potential Issuances of Shares.

         As of December 15, 1998, we had issued and outstanding:

              o    35,559,556 shares of Class A Common Stock, and

              o    3,000,000 shares of Class B Common Stock.

         At that date,  there  were an  additional  9,237,445  shares of Class A
Common Stock reserved for possible future issuances as follows:

              o   3,000,000  shares  for   issuance  upon   conversion   of  the
                  outstanding Class B Common Stock;

              o   2,790,500 shares for issuance upon the exercise of outstanding
                  options under  our 1986 Stock Option Plan.  These  options are
                  exercisable at prices ranging from $1.50 to $10.00 per share;

              o   2,000,000  shares for issuance  upon the exercise of presently
                  outstanding  options  or  options  which may be granted in the
                  future under our 1996 Stock  Option Plan.  Options to purchase
                  1,487,750  shares were outstanding at December 15, 1998. These
                  options are  exercisable at prices ranging from $0.25 to $5.25
                  per share;

              o   487,500  shares for  issuance  upon the  exercise of presently
                  outstanding  options  or  options  which may be granted in the
                  future under our 1993 Non-Employee Director Stock Option Plan.
                  Options to purchase  120,000  shares are were  outstanding  at
                  December 15, 1998.  These  options are  exercisable  at prices
                  ranging from $1.00 to $6.75 per share and

              o   959,445 shares for issuance upon exercise of other outstanding
                  warrants and options held by unaffiliated third parties. These
                  warrants and options are  exercisable  at prices  ranging from
                  $0.75 to $4.25 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 our Class A Common Stock. See "--Shares Eligible for Future Sale."

Shares Eligible For Future Sale.

         Future sales of substantial  amounts of shares in the public market, or
the perception that such sales could occur,  could  adversely  affect the market
price of our Class A Common Stock.

         As  of  December  15,  1998,  we  had  outstanding  38,559,556  shares,
consisting of 35,559,556  shares of Class A Common Stock and 3,000,000 shares of
Class B Common Stock.  Shares of Class B Common Stock are convertible into Class
A  Common  Stock  on a  share  for  share  basis.  Of  our  outstanding  shares,
approximately  20,705,368  shares of Class A Common Stock are  presently  freely
transferable without restriction under the Securities Act.

         Of the remaining 14,854,188 outstanding shares (including the 3,000,000
shares  of Class A  Common  Stock  issuable  upon  conversion  of Class B Common
Stock):

         o     10,800,000 are "restricted securities" issued in October 1998;

         o     600,438  shares  are  "restricted  securities"   issued   between
               February 1997 and December 1998; and

         o     3,453,750 shares are  held by persons who may be deemed to be our
               "affiliates".  Of  these  shares,   1,534,500   are   "restricted
               securities" issued between November 1997 and October 1998.  The

                                     - 12 -

<PAGE>



              remaining  1,919,250  of such shares are  "restricted  securities"
              that were acquired more than two years ago or are not  "restricted
              securities"  because they were  acquired in the market or pursuant
              to a registration statement under the Securities Act.

         In  general,  an  "affiliate"  is a person with the power to manage and
direct our policies. The SEC has stated that, generally,  executive officers and
directors of an entity are deemed affiliates of the entity.

         "Restricted  securities" may be (1) sold pursuant to a Prospectus under
an effective  registration statement under the Securities Act, (2) in compliance
with the exemption  provisions of Rule 144 or (3) pursuant to another  exemption
under the Securities  Act. Rule 144 permits sales of "restricted  securities" by
any person (whether or not an affiliate) after one year, at which time sales can
be made subject to the Rule's volume and other  limitations  and after two years
by  non-affiliates  without adhering to Rule 144's volume or other  limitations.
Shares  of our  Class A Common  Stock  owned by our  "affiliates"  which are not
"restricted  securities"  may be sold at any time by  complying  with Rule 144's
volume and other limitations.

         We have registered the following under the Securities Act for resale at
any time or from time to time:

         o    The 10,800,000 "restricted"  shares  of Class  A Common Stock that
              are covered by this Prospectus;

         o    398,406  "restricted"  shares  of Class A Common  Stock  issued in
              April 1998 in  consideration  for our  acquisition  of Stellar Bio
              Systems, Inc.;

         o    5,000 "restricted" shares of  Class  A Common Stock issued in June
              1996;

         o    25,000  shares  of Class  A Common Stock subject to an option held
              by a former consultant; and
 
         o    100,000  shares of Class A Common  Stock  subject to options  held
              by another former consultant.

         All of these registered shares 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 our stock option plans have been  registered  under the Securities Act for
issuance  and,  unless held by our  "affiliates",  will be freely  tradable upon
issuance.  If acquired by our  "affiliates,"  shares issued upon the exercise of
those options will not be "restricted securities" and, therefore,  could be sold
at any time by complying with Rule 144's volume and other limitations. See " - -
Dilution; Potential Issuances of Shares."

Possible Volatility of Our Stock Price

         The  stock  market  and the  price of our  Class A Common  Stock may be
subject  to  volatile   fluctuations   based  on  general  economic  and  market
conditions,  as well as our meeting  expectations of our performance,  including
the development and commercialization of our products and proposed products. The
price of our Class A Common  Stock can also be  affected by the number of shares
in the market at the time, as well as a perception of such number, including the
shares covered by this Prospectus.  In addition, stock market volatility has had
a significant effect on the market prices of securities issued by many companies
for reasons  unrelated to the operating  performance of these companies.  In the
past,  following  periods  of  volatility  in the  market  price of a  company's
securities, securities class action litigation has often been instituted against
such a company.  If similar  litigation  were  instituted  against  us, it could
result in substantial  costs and a diversion of our  management's  attention and
resources, which could have an adverse effect on our business.

Year 2000 Issues

         Historically,  certain computerized systems have used two digits rather
than four to define the  applicable  year.  Computer  equipment and software and
devices with imbedded  technology that are  time-sensitive  may recognize a date
using  "00" as the year 1900  rather  than the year  2000,  resulting  in system
failure or  miscalculations.  This problem is generally referred to as the "Year
2000 issue."
                                     - 13 -

<PAGE>



         We are in the process of assessing the impact of the Year 2000 issue on
our information  systems.  We have  identified  potential  deficiencies  and are
addressing them through updates and  remediation.  In accordance with accounting
rules,  costs associated with modifying existing computer software for Year 2000
issues will be expensed as incurred. We are also in the process of assessing the
measures  being taken by our  customers  and  suppliers to address the Year 2000
issues.  We are not dependent on any one customer or supplier and our management
believes  that  alternate  sources of supply for product  components  are widely
available.  We  do  not  expect  the  cost  of  implementing  the  upgrades  and
remediations to be material.



                                 USE OF PROCEEDS

         The Selling  Stockholders are selling all of the Shares covered by this
Prospectus for their own account.  Accordingly, we will not receive any proceeds
from the resale of the Shares.

         We received  $2,700,000  in proceeds from our sale of the Shares to the
Selling  Stockholders.  We used the proceeds,  together  with  $1,152,000 of our
funds, to repurchase:

         o    the  remaining  5%  Convertible  Debentures  with  an  outstanding
              principal  amount of $3,248,000 plus interest and a 16% premium of
              the principal amount; and

        o     outstanding Warrants  to  purchase  261,228  of our Class A Common
              Stock at an exercise price of $1.9141 per share.

         We had issued these  Debentures and Warrants in a private  placement in
May 1998.

         We will bear the  expenses  relating to this  registration,  other than
discounts and commissions, which will be paid by the Selling Stockholders.

                                     - 14 -

<PAGE>



                              SELLING STOCKHOLDERS

         We issued the shares of Class A Common Stock covered by this Prospectus
to  the  Selling  Stockholders  on  October  27,  1998  in a  private  placement
transaction.  Under the terms of the  private  placement,  we issued  10,800,000
shares of Class A Common Stock to the Selling  Stockholders  at a price of $0.25
per  share.  At the time of the  issuances,  the  price per share of our Class A
Common Stock was $0.19.  We agreed to register the Shares  issued in the private
placement under the Securities Act at our expense,  other than selling discounts
and commissions.

         The  following  table lists certain  information  regarding the Selling
Stockholders' ownership of Shares of our Class A Common Stock as of December 15,
1998, and as adjusted to reflect the sale of the Shares.  Information concerning
the  Selling   Stockholders   may  change  from  time  to  time.  See  "Plan  of
Distribution."
<TABLE>
<CAPTION>

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

<S>                                                   <C>                      <C>                       <C>       
Alfred J. Roach..................................     8,195,250 (1)                4,000,000                 4,195,250  (1)
Larry Kupferberg.................................       522,200 (2)                  400,000                   122,200  (2)
Donehew Fund Limited Partnership.................       290,000                      240,000                    50,000
David Biggs......................................        40,000                       40,000                         0
Robert Donehew...................................        90,000                       80,000                    10,000
R. Dave Garwood..................................        50,000                       40,000                    10,000
The Rachel Beth Heller 1997 Trust Lawrence                                                                             

  Kupferberg, TTEEU/A dtd 7/9/97.................       400,000                      400,000                         0
The Evan Todd Heller 1997 Trust Lawrence                                                                               

   Kupferberg, TTEE U/A dtd 6/17/97..............       400,000                      400,000                         0
Delaware Charter Guarantee &Trust                                                                      

   Company F/B/O Ronald I. Heller - IRA..........       642,075 (3)                  600,000                    42,075  (3)
Delaware Charter Guarantee & Trust                                                                                     

   Company F/B/O David S. Nagelberg - IRA........     1,242,075 (4)                1,200,000                    42,075  (4)
Tyler Runnels                                           292,700                      280,000                    12,700
Kevin Charos & Anthony Charos JTTEN..............       200,000                      200,000                         0
Delaware Charter Guarantee & Trust                                                                                     

   Company F/B/O Martin H. Meyerson -                                                                                  

   IRA...........................................       100,000                      100,000                         0

</TABLE>

                                     - 15 -

<PAGE>
<TABLE>
<CAPTION>
                                                                                                          Shares of Class A
                                                      Shares of Class A                                      Common Stock
                                                         Common Stock              Shares to be              Beneficially
                                                      Beneficially Owned              Offered                Owned After
           Name of Selling Stockholder                Prior to Offering              Hereunder                 Offering
           ---------------------------               -------------------             ---------                ---------

<S>                                                   <C>                          <C>                    <C>
Kenneth Koock....................................       120,000                      120,000                         0
Jacqueline Knapp.................................       790,000                      790,000                         0
Janice Halle-Nesses..............................       790,000                      790,000                         0
John Davies......................................       160,000                      160,000                         0
Invest, Inc......................................       160,000                      160,000                         0
Peter Janssen....................................       800,000                      800,000                         0
                                                        -------                      -------                    ------
         Total                                       15,284,300                   10,800,000                 4,484,300

</TABLE>

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

(1)      Includes  3,000,000  shares  of  Class A  Common  Stock  issuable  upon
         conversion of currently  outstanding Class B Common Stock and 1,160,000
         shares of Class A Common  Stock  issuable  upon  exercise of  presently
         exercisable options.

(2)      Does not include  400,000  shares of Class A Common Stock  beneficially
         owned by the Evan Todd Heller 1997 Trust and 400,000  shares of Class A
         Common Stock  beneficially  owned by the Rachel Beth Heller 1997 Trust,
         which are listed  separately  below.  Mr.  Kupferberg is the trustee of
         those trusts.

(3)      Includes  42,075 shares of Class A Common Stock  issuable upon exercise
         of presently  exercisable  warrants  beneficially  owned by Mr. Heller.
         Those warrants are exercisable at $.075 per share.

(4)      Includes  42,075 shares of Class A Common Stock  issuable upon exercise
         of presently  exercisable warrants beneficially owned by Mr. Nagelberg.
         Those warrants are exercisable at $.075 per share.

         Each of Messrs. Heller, Nagelberg,  Koock and Meyerson are employees of
M.H. Meyerson, a financial advisor of ours since August 1998.

                                     - 16 -

<PAGE>



                              PLAN OF DISTRIBUTION

         The Selling  Stockholders and their pledgees,  donees,  transferees and
other successors in interest, may offer their Shares at various times in or more
of the following transactions:

o         in the over-the-counter market; or

o         in privately negotiated transactions

at  prevailing  market  prices at the time of sale,  at prices  related  to such
prevailing market prices, at negotiated prices or at fixed prices.

         The  Selling  Stockholders  may also  sell the  Shares  under  Rule 144
instead of under this Prospectus, if Rule 144 is available for such sales.

         The  transactions  in the Shares may be  effected by one or more of the
following methods:

         o    ordinary  brokerage  transactions  and transactions  in which  the
              broker solicits purchasers;

         o    purchases  by a broker or dealer as  principal,  and the resale by
              such broker or dealer for its account pursuant to this Prospectus,
              including resale to another broker or dealer;

         o    block  trades in which the broker or dealer  will  attempt to sell
              the Shares as agent but may  position  and resell a portion of the
              block as principal in order to facilitate the transaction; or

         o negotiated  transactions  between Selling Stockholders and purchasers
without a broker or dealer.

         The Selling Stockholders and any broker-dealers or other persons acting
on the behalf of parties that  participate in the distribution of the Shares may
be deemed to be  underwriters.  As such, any commissions or profits they receive
on the  resale of the  Shares  may be deemed to be  underwriting  discounts  and
commissions under the Securities Act.

         As of the date of this  Prospectus,  we are not aware of any agreement,
arrangement or understanding between any broker or dealer and any of the Selling
Stockholders  with  respect to the offer or sale of the Shares  pursuant to this
Prospectus.

         We have advised the Selling  Stockholders  that during the time each is
engaged in distributing Shares covered by this Prospectus, each must comply with
the requirements of the Securities Act and Rule 10b-5 and Regulation M under the
Exchange Act. Under such rules and regulations, they:

         o    may not engage in any stabilization  activity  in connection  with
              our securities;

         o    must furnish each broker which offers Class A Common Stock covered
              by this  Prospectus  with the number of copies of this  Prospectus
              which are required by each broker; and

         o    may not bid for or purchase  any of our  securities  or attempt to
              induce any person to purchase any of our securities  other than as
              permitted under the Exchange Act.

         In the Purchase and  Investment  Agreements  we executed in  connection
with the October 1998 private placement we agreed to indemnify and hold harmless
each Selling  Stockholder  against certain  liabilities,  including  liabilities
under the  Securities  Act,  which may be based upon,  among other  things,  any
untrue  statement or alleged untrue statement of a material fact or any omission
or alleged omission of a material fact,  unless made or omitted in reliance upon
written information provided to us by that Selling  Stockholder.  We have agreed
to bear the  expenses  incident to the  registration  of the Shares,  other than
selling discounts and commissions.

                                     - 17 -

<PAGE>



                                  LEGAL MATTERS

         The validity of the shares of Class A Common  Stock being  offered will
be passed upon for the Company by Parker Chapin Flattau & Klimpl, LLP.

                                     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.  Such
financial statements and report are incorporated by reference herein in reliance
upon the authority of said firm as experts in accounting  and auditing in giving
said reports.
                                     - 18 -

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

   We have not  authorized  any  dealer,               10,800,000 Shares        
salesperson  or any other person to give                                        
any information or to represent anything                                        
not  contained in this  Prospectus.  You                                        
must  not   rely  on  any   unauthorized      American Biogenetic Sciences, Inc.
information.  This  Prospectus  does not                                        
offer to sell or buy any  shares  in any                                        
jurisdiction  where it is unlawful.  The                                        
information   in  this   Prospectus   is             Class A Common Stock       
current as of _____________, 1999.                                              
                                                                                
                                                                                
                                                                                
          ---------------------                      --------------------       
                                                                                
            TABLE OF CONTENTS                             PROSPECTUS            
          ---------------------                      ---------------------      
                                                                                
                                    Page 
                                    ----                                        
Where You Can Find More                      
    Information About Us...............2
Prospectus Summary.....................3
Risk Factors...........................5
Use of Proceeds.......................14
Selling Stockholders .................15
Plan of Distribution .................17
Legal Matters.........................18
Experts ..............................18                ________ __, 1999


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

<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..............................$  2,580.17  
      Accounting Fees and Expenses......................$  3,500.00  
      Legal Fees and Expenses...........................$  7,500.00  
      Miscellaneous.....................................$  1,419.83  
                                                         ----------  
                                                                     
            TOTAL........................................$15,000.00  
      
Item 15.  Indemnification of Directors and Officers

         Section  145 of the  General  Corporation  Law of the State of Delaware
(the "DGCL") provides,  in general,  that a corporation  incorporated  under the
laws of the State of Delaware, such as the Registrant,  may indemnify any person
who was or is a party or is  threatened  to be made a party  to any  threatened,
pending or completed action,  suit or proceeding (other than a derivative action
by or in the right of the corporation) by reason of the fact that such person is
or was a director,  officer, employee or agent of the corporation,  or is or was
serving at the request of the  corporation as a director,  officer,  employee or
agent of another  enterprise,  against  expenses  (including  attorneys'  fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred
by such person in connection with such action, suit or proceeding if such person
acted in good faith and in a manner such person reasonably  believed to be in or
not opposed to the best interests of the  corporation,  and, with respect to any
criminal action or proceeding,  had no reasonable cause to believe such person's
conduct was unlawful. In the case of a derivative action, a Delaware corporation
may indemnify  any such person  against  expenses  (including  attorneys'  fees)
actually and reasonably  incurred by such person in connection  with the defense
or settlement of such action or suit if such person acted in good faith and in a
manner  such  person  reasonably  believed  to be in or not  opposed to the best
interests of the corporation,  except that no  indemnification  shall be made in
respect of any claim,  issue or matter as to which such  person  shall have been
adjudged to be liable to the corporation  unless and only to the extent that the
court determines such person is fairly and reasonably  entitled to indemnity for
such expenses.

         Article VII of the registrant's By-laws provides for indemnification of
directors,  officers,  employees and agents of the Company to the 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 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 the Purchase and Investment  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

                                      II-1

<PAGE>



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.

Item 16.  Exhibits


Exhibit
Number
- -------

3.1            Restated  Certificate of Incorporation  of the Company,  as filed
               with the  Secretary of State of the State of Delaware on July 30,
               1996  (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).*


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             Form of Purchase and Investment Agreement executed by the Company
               and each of the Selling Stockholders on October 27, 1998.


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

* 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.

                                      II-2

<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-3

<PAGE>

                                   SIGNATURES
                                   ----------

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the  Town of  Copiague,  State of New  York,  on the 23rd day of
December, 1998.


                                              AMERICAN BIOGENETIC SCIENCES, INC.


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

      KNOW ALL  PERSONS BY THESE  PRESENTS,  that each  person  whose  signature
appears below
constitutes  and appoints each of Alfred J. Roach,  Josef C. Schoell and Timothy
J. Roach and each of them with power of substitution,  as his  attorney-in-fact,
in all  capacities,  to  sign  any  amendments  to this  registration  statement
(including  post-effective  amendments)  and to file  the  same,  with  exhibits
thereto and other  documents in connection  therewith,  with the  Securities and
Exchange   Commission,   hereby   ratifying   and   confirming   all  that  said
attorney-in-facts  or their  substitutes  may do or  cause to be done by  virtue
hereof.

      Pursuant  to  the  requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement  has been signed below by the  following  persons in the
capacities indicated on the 23rd day of December, 1998.

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


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

/s/ John S. North
- -------------------------------------      President, Chief Executive Officer,
    John S. North                          Director

/s/ Josef C. Schoell                      
- -------------------------------------      Vice President-Finance (Principal
Josef C. Schoell                           Financial and 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/ Timothy J. Roach
- -------------------------------------
Timothy J. Roach                           Director

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

                                      II-4

<PAGE>


                                  EXHIBIT INDEX

Exhibit
Number
- -------

3.1            Restated  Certificate of Incorporation  of the Company,  as filed
               with the  Secretary of State of the State of Delaware on July 30,
               1996  (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).*


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             Form of Purchase and Investment Agreement executed by the Company
               and each of the Selling Stockholders on October 27, 1998.


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

* 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.


                                                                       EXHIBIT 5

                      PARKER CHAPIN FLATTAU & KLIMPL LLP.
                           1211 Avenue of the Americas
                               New York, NY 10036
                                 (212) 704-6000


                                                     December 23, 1998



American Biogenetic Sciences, Inc.
1375 Akron Street
Copiague, New York  11726

Gentlemen:

         We have  acted as  counsel  to  American  Biogenetic  Sciences,  Inc, a
Delaware  corporation  (the  "Company"),   in  connection  with  a  Registration
Statement  on Form S-3  (the  "Registration  Statement")  being  filed  with the
Securities and Exchange Commission under the Securities Act of 1933, as amended,
covering an aggregate of 10,800,000 shares (the "Shares") of the Company's Class
A Common Stock,  $.001 par value,  issued in a private placement  transaction in
October 1998 (the "Private Placement").

         In connection with the foregoing, we have examined originals or copies,
satisfactory  to us, of all such corporate  records and of all such  agreements,
certificates  and other  documents as we have deemed relevant and necessary as a
basis  for the  opinion  hereinafter  expressed.  In such  examination,  we have
assumed the  genuineness of all  signatures,  the  authenticity of all documents
submitted to us as originals and the conformity  with the original  documents of
all documents submitted to us as copies or facsimiles.  As to any facts material
to  such  opinion,  we  have,  to  the  extent  that  relevant  facts  were  not
independently  established by us, relied on certificates of public officials and
certificates of officers or other representatives of the Company.

         Based upon and subject to the foregoing, we are of the opinion that the
Shares are validly issued, fully paid and non-assessable.

         We  hereby  consent  to the use of our name  under the  caption  "Legal
Matters" in the Prospectus constituting a part of the Registration Statement and
to the filing of this opinion as an exhibit to the Registration Statement.

                                      Very truly yours,

                                      /s/ Parker Chapin Flattau & Klimpl, LLP

                                      PARKER CHAPIN FLATTAU & KLIMPL, LLP


                                                                    EXHIBIT 23.1


                    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.


                                                        /s/ Arthur Andersen LLP

Melville, New York
December 23, 1998

                                                                      EXHIBIT 99


                    FORM OF PURCHASE AND INVESTMENT AGREEMENT



                                                     October 27, 1998


American Biogenetic Sciences, Inc.
1375 Akron Street
Copiague, NY 11726

Gentlemen:

         The following will constitute our agreement between American Biogenetic
Sciences, Inc. ("Company") and the undersigned (the "Purchaser").

         1. Purchaser purchases from the Company  _______________  shares of the
Company's  Class A Common Stock,  $.001 par value,  (the "Shares") at a price of
$0.25 per share, for a total purchase price of
$---------------.

         2. The company shall  deliver to Purchaser a certificate  registered in
the name of  Purchaser,  representing  the Share within five (5)  business  days
after  Purchaser  shall have paid to the Company the full purchase  price of the
Shares of Common Stock in the above amount payable to the Company.

         3. To induce the Company to issue the Shares, Purchaser represents that
(a) Purchaser is acquiring the Shares for investment only and not with a view to
the distribution of all or any part thereof,  as the phrases  "investment  only"
and  "distribution"  have meaning under the  Securities  Act of 1933, as amended
(the "Act");  and (b)  Purchaser has been informed that the Shares have not been
registered  under  the  Act;  that  the  Shares  must be held  unless  they  are
subsequently  registered under the Act or an exemption from such registration is
available;  that any sales of the Shares made in  reliance  upon Rule 144 of the
Securities  and  Exchange  Commission  (the  "Commission")  can be made  only in
amounts in accordance  with the terms and conditions of that rule;  that in case
the rule is not  applicable  to a  disposition  of the Shares,  compliance  with
Regulation  A of the  Commission  of some  other  disclosure  exemption  will be
required;  and that the Company is under no  obligation  to register  the Shares
under the Act.

         4. In  connection  with  the  purchase  of the  Shares,  the  Purchaser
acknowledges  that the  Company  will be relying on the  information  and on the
representations  set  forth  herein,  and  represents,   warrants,   agrees  and
acknowledges that:

         (a)      The Purchaser is an Accredited  Investor  under rule 501(a) of
                  Regulation under the Securities Act of 1933, as amended.

         (b)      the  Purchaser  has had  substantial  experience  in  previous
                  private and public  purchases of securities and has sufficient
                  knowledge and experience in financial and business  matters so
                  that the Purchaser is able to evaluate,  alone, the merits and
                  risks of purchasing the Shares;

         (c)      The  Purchaser  does  not  require  the  funds  being  used to
                  purchase the shares for liquidity needs, has adequate means to
                  provide for the  Purchaser's  personal  needs,  possesses  the
                  ability  to bear  the  economic  risk of  holding  the  Shares
                  indefinitely,  and can afford a complete  loss on the purchase
                  of the Shares; and
<PAGE>



         (d)      Purchaser has received a copy of the  company's  Form 10-K for
                  the year ended  December 31, 1997,  its  Quarterly  Reports of
                  Form 10-Q,  for the periods ending March 31, 1998 and June 30,
                  1998,  its proxy  statement  for the 1998  Annual  Meeting  of
                  Stockholders  and all reports on Form 8-K filed since  January
                  1, 1998 (collectively  "SEC Reports"),  has had an opportunity
                  to obtain such additional  information necessary to verify the
                  accuracy of and to  appropriately  supplement the  information
                  set  forth in such SEC  Reports  as  Purchaser  has  requested
                  through   discussions  with  officers  and  directors  of  the
                  Company. The Purchaser does not require any other documents or
                  information prior to completing the Purchase of the Shares.

         5.  Purchaser  agrees that the  certificates  evidencing the Shares may
bear the following legend restricting their transferability under the Act:

                                     LEGEND

         THE SHARES REPRESENTED BY THIS CERTIFICATE WERE ACQUIRED FOR INVESTMENT
         AND HAVE NOT BEEN  REGISTERED  UNDER  THE  SECURITIES  ACT OF 1933,  AS
         AMENDED  ("ACT").  NO SALE,  OFFER TO SELL OR  TRANSFER  OF THE  SHARES
         REPRESENTED  BY THIS  CERTIFICATE  SHALL BE MADE IN THE  ABSENCE  OF AN
         EFFECTIVE  REGISTRATION  STATEMENT  FOR THE SHARES UNDER THE ACT, OR AN
         OPINION OF COUNSEL TO THE COMPANY  THAT  REGISTRATION  IS NOT  REQUIRED
         UNDER THE ACT.

         6. Purchaser agrees to give the Company written notice before effecting
any  proposed  disposition  of the  Shares,  describing  therein  the  manner of
proposed  disposition  and such other  information as the Company or its Counsel
may  request.  Such notice shall not contain any untrue  statement  nor omit any
statement necessary to make the statements made not false or misleading.

         7. This  Agreement  may not be changed  unless in writing and signed by
both  parties and  supersedes  all prior  agreements  between  the parties  with
respect to its subject matter. This Agreement shall be governed by and construed
and  enforced  in  accordance  with the laws of the State of New York.  A signed
photocopy or facsimile  copy of the Agreement is valid and binding as if it were
an original.

         8.  The  Company  shall  register   under  a   registration   statement
("Registration  Statement")  filed pursuant to the Act and such state "Blue Sky"
laws of those states as are  reasonably  selected by the  Purchaser,  the Shares
(hereinafter,  the  "Registrable  Securities").  The Company  agrees to file the
Registration  Statement  on or before 60 days of the date  hereof.  The  Company
agrees  to use its best  efforts  to have the  Registration  Statement  declared
effective  within  six months of the date  hereof.  The  Company  shall keep the
Registration Statement effective and current until all the securities registered
thereunder  are sold or until all such  securities may be sold by the Purchasers
thereof under Rule 144 without volume limitations.

                  The Company  shall bear all the  expenses and pay all the fees
it incurs  in  connection  with the  preparation,  filing  and  modification  or
amendment  of the  Registration  Statement  with  the  Securities  and  Exchange
Commission,  selected  states  and the NASD,  including  but not  limited to all
registration  and filing fees,  printing  expenses,  fees and  disbursements  of
counsel and the fees and disbursements of one counsel, selected by a majority of
the Purchasers, to review the Registration Statement and assist in the clearance
of the registration with the NASD.  Moreover,  if the Company willfully fails to
comply with the provisions of this Section 8, the Company shall,  in addition to
any other  equitable or other relief  available to the Purchaser,  be liable for
any and all  incidental,  special and  consequential  damages and damages due to
loss of profits sustained by the Purchaser.

                  To the extent permitted by law, the Company will indemnify and
hold harmless each holder of the Registrable Securities ("Holder"), the officers
and  directors of each Holder and each person,  if any, who controls such Holder
within the meaning of the Act or  Securities  Exchange  Act of 1934,  as amended
("Exchange Act") against any losses,  claims,  damages,  or liabilities to which
they may become subject under the Act, the Exchange Act or any state  securities
law or regulation (including all reasonable attorneys' fees and other expenses

<PAGE>


reasonably  incurred in investigating,  preparing or defending against any claim
whatsoever incurred by the indemnified party in any action or proceeding between
the indemnitor and indemnified  party or between the  indemnified  party and any
third party or otherwise) to which any of them may become subject under the Act,
the Exchange Act or any other statute or common law or otherwise  under the laws
of foreign countries, arising from such registration statement or based upon any
untrue statement or alleged untrue statement of a material fact contained in (i)
any preliminary  prospectus,  the registration  statement or prospectus (as from
time to time each may be amended and  supplemented);  (ii) in any post-effective
amendment or amendments  or any new  registration  statement  and  prospectus in
which it included the Registrable Securities;  or (iii) any application or other
document or written communication  (collectively called "application")  executed
by the Company or based upon written information furnished by the Company in any
jurisdiction in order to qualify the Registrable Securities under the securities
laws thereof or filed with the  Securities  and Exchange  Commission,  any state
securities  commission  or agency,  Nasdaq or any  securities  exchange;  or the
omission or alleged omission  therefrom of a material fact required to be stated
therein  or  necessary  to  make  the  statements   therein,  in  light  of  the
circumstances under which they were made, not misleading,  unless such statement
or omission is made in reliance upon,  and in strict  conformity  with,  written
information  furnished to the Company with respect to such Holder  expressly for
use in any preliminary prospectus, such registration statement or prospectus, or
any amendment or supplement thereof, or in any application,  as the case may be.
The Company agrees promptly to notify the Holder of the  Registrable  Securities
of the commencement of any litigation or proceedings  against the Company or any
of its officers,  directors or controlling  persons in connection with the issue
and sale or resale of the Registrable  Securities or in connection with any such
registration statement or prospectus.

         9. The Company  represent and warrants:  (a) that the SEC Reports taken
as a whole,  do not contain any untrue  statement of a material  fact or omit to
state any material fact  required to be stated  therein or necessary to make the
statements  therein,  in light of the circumstances  under which they were made,
not misleading;  (b) that the Shares have been duly and validly  authorized and,
upon payment  therefore in accordance with the terms of this Agreement,  will be
fully paid and  nonassessable;  and (c) this Agreement has been duly authorized,
executed  and  delivered  by the  Company  and is a  legal,  valid  and  binding
obligation of the Company enforceable in accordance with its terms.

         10. The Company  covenants and agrees that (a) the proceeds of the sale
of the Shares  will be used solely for the purpose of  redeeming  the  Company's
outstanding  convertible  debentures  ("Debentures")  within 30 days of the date
hereof;  and (b) it shall take such  action as is  necessary  to have the Shares
approved for listing on the Nasdaq  National  Market System  promptly  after the
date hereof.  If the Company does not redeem the  Debentures  within such 30 day
period,  the  Purchaser  shall have the right to rescind the purchase  within 60
days  thereafter  and the Company  shall be required to purchase the Shares from
each rescinding Purchaser.

         This  letter  serves as an offer by the  undersigned  to  purchase  the
Shares and is subject to acceptance by the Company.

American Biogenetic Sciences, Inc.            Purchaser


By:      ______________________               _____________________________
Name:    Josef C. Schoell                     Name: Signature
Title:   Vice President Finance               Name Printed: _______________
                                              Address: _________________
                                                       _________________

                                              Soc. Sec. No.: ______________


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission