HUMAN GENOME SCIENCES INC
S-3, 1997-04-25
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 25, 1997
                                                      REGISTRATION NO. 333-_____
- --------------------------------------------------------------------------------

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

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                   -----------

                           HUMAN GENOME SCIENCES, INC.
             (Exact name of Registrant as specified in its charter)
<TABLE>
<CAPTION>
<S>                                <C>                              <C>
           DELAWARE                            8980                       22-3178468
        (State or other            (Primary standard industrial        (I.R.S. employer
jurisdiction of incorporation)      classification code number)     identification number)
</TABLE>
   
                              9410 KEY WEST AVENUE
                         ROCKVILLE, MARYLAND 20850-3338
                                 (301) 309-8504
   (Address and telephone number of Registrant's principal executive offices)
                                   -----------

                           WILLIAM A. HASELTINE, PH.D.
                           HUMAN GENOME SCIENCES, INC.
                              9410 KEY WEST AVENUE
                         ROCKVILLE, MARYLAND 20850-3338

                                 (301) 309-8504

            (Name, address and telephone number of agent for service)
                                   -----------

                                   COPIES TO:
                             Sheldon E. Misher, Esq.
                      Bachner, Tally, Polevoy & Misher LLP
                               380 Madison Avenue
                          New York, New York 10017-2590
                                 (212) 687-7000

                                   -----------

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
   As soon as practicable after this Registration Statement becomes effective.

                                   -----------

         If only  securities  being  registered  on this form are being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. |_|
<PAGE>

         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, please 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. |_|

                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
                                 AMOUNT TO       PROPOSED MAXIMUM         PROPOSED MAXIMUM
TITLE OF EACH CLASS OF              BE          OFFERING PRICE PER       AGGREGATE OFFERING          AMOUNT OF
SECURITIES TO BE REGISTERED      REGISTERED         SHARE(1)                   PRICE              REGISTRATION FEE
<S>                               <C>                 <C>                  <C>                        <C>    
Shares of Common Stock,           50,871              $32.50                $1,653,308                 $501.00
$.01 par value................
</TABLE>

(1)      Estimated solely for purposes of calculating the registration fee.
(2)      Based on the  average of the high and low price of the Common  Stock as
         reported on the Nasdaq National Market System on April 22, 1997.

                                   -----------

         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.

                                       ii

<PAGE>



                  SUBJECT TO COMPLETION -- DATED APRIL 25, 1997

PROSPECTUS
                                  50,871 SHARES

                           HUMAN GENOME SCIENCES, INC.
                                  COMMON STOCK
                                   -----------

         This  Prospectus  relates to the public offering of up to 50,871 shares
of Common Stock,  $.01 par value (the "Common Stock") by the holder thereof (the
"Selling  Stockholder").  The Common  Stock  offered by the Selling  Stockholder
hereunder is issuable  upon  exercise of warrants to purchase  Common Stock (the
"Warrants").  See  "Selling  Securityholder"  herein.  The  Selling  Stockholder
directly,  through agents  designated  from time to time, or through  dealers or
underwriters also to be designated,  may sell the Common Stock from time to time
on terms to be  determined  at the time of sale.  To the  extent  required,  the
specific  Common Stock to be sold,  purchase price,  public offering price,  the
names of any such agent, dealer or underwriter, and any applicable commission or
discount with respect to a particular offer will be set forth in an accompanying
Prospectus Supplement. See "Plan of Distribution."

         The Selling  Stockholder and any broker-dealer,  agents or underwriters
that participate with the Selling  Stockholder in the distribution of the Common
Stock may be deemed to be  "underwriters"  within the meaning of the  Securities
Act and any  commission  received  by them and any  profit on the  resale of the
Common Stock purchased by them may be deemed to be  underwriting  commissions or
discounts  under the  Securities  Act.  See "Plan of  Distribution"  herein  for
indemnification arrangements.

         The shares of Common  Stock are listed on the  NASDAQ  National  Market
System under the symbol  "HGSI." The closing  price of the Common Stock on April
23, 1997, was $33.50.

         The Company is paying all the expenses of registering  the Common Stock
under the Securities Act (including filing, legal, and miscellaneous expenses in
connection with the  registration)  which are estimated at $25,000.  The Company
will not receive any of the  proceeds  from any sale of the Common  Stock by the
Selling  Stockholder.  The Selling  Stockholder will pay or assume  underwriting
discounts,  brokerage  commissions or other charges  incurred in any sale of the
Common Stock. 

                                   -----------

         THE SHARES OF COMMON  STOCK  OFFERED  HEREBY  INVOLVE A HIGH  DEGREE OF
RISK. SEE "RISK FACTORS" BEGINNING AT PAGE 6.
                                   -----------

          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
                 COMMISSION NOR HAS THE SECURITIES AND EXCHANGE
                  COMMISSION OR ANY STATE SECURITIES COMMISSION
                     PASSED UPON THE ACCURACY OR ADEQUACY OF
                     THIS PROSPECTUS. ANY REPRESENTATION TO
                       THE CONTRARY IS A CRIMINAL OFFENSE.

                The date of this Prospectus is ___________, 1997


<PAGE>



                              AVAILABLE INFORMATION

                  The  Company  has  filed  with  the  Securities  and  Exchange
Commission (the "Commission"), Washington, D.C. a Registration Statement on Form
S-3 under the Securities Act of 1933, as amended (the "Securities Act") covering
the securities offered by this Prospectus.  This Prospectus does not contain all
of the  information  set forth in the  Registration  Statement  and the exhibits
thereto.  Statements  contained  in this  Prospectus  as to the  contents of any
contract or other document referred to are not necessarily  complete and in each
instance  such  statement is  qualified  by  reference to each such  contract or
document.  The  Company  is  subject to the  informational  requirements  of the
Securities  Exchange  Act of  1934  (the  "Exchange  Act"),  and  in  accordance
therewith files reports and other  information with the Commission.  Reports and
other  information filed by the Company with the Commission can be inspected and
copied at the public  reference  facilities  maintained by the Commission at the
following  addresses:  New York Regional Office,  Seven World Trade Center,  New
York, New York 10048;  and Chicago Regional  Office,  Citicorp Center,  500 West
Madison Street,  Chicago,  Illinois  60661-2511.  Copies of such material can be
obtained  from the  Public  Reference  Section  of the  Commission  at 450 Fifth
Street, N.W., Washington, D.C. 20549 at prescribed rates.

                                   -----------

         The Company  furnishes to its  stockholders  annual reports  containing
audited financial  statements and quarterly reports for the first three quarters
of each fiscal year containing unaudited interim financial information.


                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The following  documents  filed with the Commission  (File No. 0-22962)
pursuant to the Exchange Act are incorporated herein by reference:

         1. The  Company's  Annual Report on Form 10-K for the fiscal year ended
December 31, 1996,  including any documents or portions thereof  incorporated by
reference therein;

         2. All other documents filed by the Company pursuant to Sections 13(a),
13(c), 14 or 15(d) of the Exchange Act subsequent to the date of this Prospectus
and prior to the termination of this offering.

         All documents filed by the Company pursuant to Section 13(a), 13(c), 14
or 15(d) of the Exchange Act subsequent to the date of this Prospectus and prior
to the  termination  of the  offering  shall be  deemed  to be  incorporated  by
reference in this Prospectus and to be a part hereof from the date of the filing
of  such  documents.  Any  statement  contained  herein,  in any  supplement  or
amendment hereof or in a document all or any portion of which is incorporated or
deemed to be incorporated by reference  herein shall be deemed to be modified or
superseded  for  purposes  of this  Prospectus  to the extent  that a  statement
contained herein or in any supplement or amendment hereof modifies or supersedes
such statement. Any statement so modified or

                                       2
<PAGE>



superseded  shall  not be  deemed,  except  as so  modified  or  superseded,  to
constitute a part of this Prospectus or any supplement or amendment hereof.

         Neither the delivery of this Prospectus nor any sale of securities made
hereunder shall, under any circumstances,  create any implication that there has
been no change in the  affairs of the Company or its  affiliates  since the date
hereof  or that the  information  contained  herein  is  correct  as of any time
subsequent to its date.

         Copies of documents incorporated by reference herein are available from
the Company  without charge (other than exhibits to such  document,  unless such
exhibits are  specifically  incorporated by reference into the information  that
this  Prospectus  incorporates)  to  any  person  to  whom  this  Prospectus  is
delivered,  upon written or oral  request of such person.  This request for such
documents  should be directed to the Company,  9410 Key West Avenue,  Rockville,
Maryland  20850-3338,  (301)  309-8504,  Attn:  Senior Vice  President and Chief
Financial Officer.

                                       3
<PAGE>



                                   THE COMPANY

         Human Genome Sciences,  Inc. (the "Company") is engaged in the research
and development of novel,  proprietary  pharmaceutical  and diagnostic  products
based on the discovery and understanding of the medical utility of genes.  Using
automated, high throughput gene sequencing technology, the Company has generated
over  1,000,000  partial  human  gene  sequences,  which  the  Company  believes
correspond to most of the expressed  genes in the human body,  and possesses one
of the largest proprietary databases of human and microbial genes. Based on this
genomic database, the Company has created a broad base of product opportunities.
The Company's  activities have progressed to focusing  primarily on research and
development  of  therapeutic  protein  product  candidates.  In its  efforts  to
identify the most promising  product  candidates,  the Company uses its advanced
proprietary bioinformatics system to analyze partial gene sequences and identify
the genes  corresponding to such partial gene sequences and the proteins encoded
by  such  genes.  As  of  February  15,  1997,  the  Company  has  isolated  and
characterized  several hundred full-length genes and expressed and purified more
than 100 potential therapeutic proteins. The Company is currently evaluating six
therapeutic protein product candidates in preclinical studies. In addition,  the
Company is  investigating  for development  with its  collaborators  proprietary
product  opportunities  in  diagnostics  and small molecule drugs based on human
genes,  as well as  vaccines,  antibiotics,  and  diagnostics  based on genes of
microorganisms.

         The Company has a two-pronged commercialization strategy:

     PRODUCT  DEVELOPMENT  AND  COMMERCIALIZATION.   The  Company  utilizes  its
     internal  capabilities  to  research  and develop  recombinant  therapeutic
     proteins, which are proteins that can be produced on a large scale and used
     as drugs to treat  diseases.  The  Company  generally  intends  to  develop
     potential  products to a late  preclinical or early clinical stage and then
     to collaborate with  pharmaceutical or biotechnology  companies for further
     development  and  commercialization.  However,  the  Company  may  consider
     developing certain potential products on its own.

     CORPORATE   COLLABORATIONS.   The  Company   leverages  its  resources  and
     capabilities by establishing  collaborations with pharmaceutical  companies
     for the  development  and  commercialization  of new products.  The Company
     believes  that these  arrangements  will  enable  the  Company to focus its
     internal resources on a select number of promising product candidates while
     still exploiting the broader product opportunities presented by its genomic
     database.

         The Company's initial  collaboration was formed with SmithKline Beecham
Corporation   ("SmithKline   Beecham")  in  May  1993  (as   amended,   the  "SB
Collaboration  Agreements").  To date,  the Company has received $125 million in
payments from SmithKline Beecham and is further entitled to product  development
milestone  payments  and  royalty  payments.  In  June  1995,  the  Company  and
SmithKline  Beecham entered into a collaboration  agreement with Takeda Chemical
Industries,  Ltd.  ("Takeda"),  whereby  Takeda was  granted  certain  rights to
develop  and  commercialize  products  based  on the  Company's  and  SmithKline
Beecham's  human gene  technology  ("Human  Gene  Technology")  and an option to
develop and commercialize for Japan

                                       4
<PAGE>



certain products developed by the Company. In June 1996 the Company entered into
a significant amendment (the "SB Amendment") to the SB Collaboration  Agreements
which,  among other  things,  allows the Company to  designate  six  therapeutic
proteins  at any  one  time  for  exclusive  development  and  commercialization
(subject   to  certain   restrictions   and  co-   development   rights  of  its
collaborators)  and permits the  Company  and  SmithKline  Beecham to enter into
additional collaboration agreements in the field covered by the SB Collaboration
Agreements.

         In June 1996 and July 1996, the Company and SmithKline  Beecham entered
into collaboration  agreements (the "New Collaboration Partner Agreements") with
Schering     Corporation    and     Schering-Plough,     Ltd.     (collectively,
"Schering-Plough"),  Synthelabo  S.A.  ("Synthelabo")  and Merck KGaA  ("Merck")
(collectively,  the "New  Collaboration  Partners").  Under the terms of the New
Collaboration Partner Agreements, $87.5 million of license and research payments
is payable to the  Company  over five  years,  of which  $17.5  million has been
received to date. In addition,  the New Collaboration Partner Agreements provide
for milestone  and royalty  payments  with respect to products  developed  under
these agreements.  In exchange,  the New Collaboration Partners received certain
rights to research,  develop and commercialize therapeutic products based on the
Company's and SmithKline  Beecham's Human Gene Technology.  Schering-Plough  and
SmithKline  Beecham  have been  granted  the right to develop  jointly  with the
Company  certain of the  therapeutic  protein  product  candidates  to which the
Company has retained the exclusive development rights.

         The Company has entered into other collaborative  agreements in certain
areas where the Company has retained exclusive rights,  including:  the creation
of bacterial vaccines and  immunotherapeutics  and antimicrobial agents based on
genes of infectious  agents;  corn genomics;  and gene therapy.  Pursuant to the
terms of such collaboration agreements, an aggregate of $34.1 million of license
and research  payments is payable to the Company over five years, of which $18.5
million has been received to date.

         The  Company  also has formed a  collaboration  with The  Institute  of
Genomic Research ("TIGR").  Under the collaboration  agreement,  the Company has
agreed to provide TIGR with funding  totaling $85 million over a ten-year period
ending  September  2002,  of which $46 million has been paid to date. In return,
the Company is  entitled to  exclusive  intellectual  property  rights to TIGR's
research.

         The Company  vigorously  pursues  patents to protect  its  intellectual
property.  As of February  15,  1997,  the Company has five issued U.S.  patents
covering full-length genes and has filed U.S. patent applications  covering more
than 230  full-length  genes and the  proteins  they encode.  The Company  makes
patent filings outside the United States as it deems  appropriate.  In addition,
the Company has filed  patent  applications  with  respect to more than  190,000
expressed  sequence tags ("EST's")  that  represent over 1,000,000  partial gene
sequences,  although there is substantial uncertainty as to the patentability of
partial gene sequences.

         The Company was  incorporated  in Delaware in June 1992.  The Company's
executive offices are located at 9410 Key West Avenue, Rockville, Maryland 20850
and its telephone number is (301) 309-8504.


                                       5
<PAGE>


                                  RISK FACTORS

         THE FOLLOWING RISK FACTORS  SHOULD BE CAREFULLY  CONSIDERED IN ADDITION
TO THE OTHER  INFORMATION  CONTAINED IN THIS  PROSPECTUS  BEFORE  PURCHASING THE
COMMON STOCK OFFERED HEREBY.

         UNPROVEN  BUSINESS  STRATEGY.  The  Company's  strategy  of using  high
throughput gene sequencing for the purpose of rapidly  identifying and obtaining
proprietary  rights to a  substantial  number of genes and then  selecting  from
those genes promising  candidates to be used to develop novel  pharmaceutical or
diagnostic  products or pharmaceutical  targets is unproven.  The application of
this  strategy  is in  too  early  a  stage  to  determine  whether  it  can  be
successfully  implemented.   Unlike  companies  that  have  targeted  particular
diseases and sought to find cures through  gene-based  therapies,  the Company's
approach is to find as many genes as possible and then use this  information  as
the basis for development of potential products.  There can be no assurance that
this  strategy  will  result  in  the  development  of  any  products.  See  "--
Competition."

         Although  the  Company has  identified  a  substantial  number of genes
through partial sequencing, its success will depend upon its ability and that of
its collaborators to determine which genes have potential value and to select an
appropriate commercialization strategy for each potential product they choose to
pursue.  To select  potential  product  candidates,  the  Company  is  investing
significant  time and resources  isolating  and  sequencing  full-length  genes,
testing and analyzing the genes and determining their functions.  The Company is
now devoting an increasing  portion of its resources to early-stage  development
of  therapeutic  protein  product  candidates.  The  Company has  recently  made
substantial capital  expenditures and hired additional personnel to enable it to
engage in these activities. Substantial additional expenditures will be required
by the Company. The failure to allocate its resources towards those products, if
any, with the most commercial  potential could have a material adverse effect on
the Company. There can be no assurance that the Company will successfully select
those genes with the most  potential  for  commercial  development,  or that any
products  based  on  genes   discovered  by  the  Company  can  be  successfully
commercialized.

         EARLY STAGE OF THE COMPANY;  ANTICIPATED  FUTURE LOSSES. The Company is
in the early stage of  development,  and it will be a number of years,  if ever,
before  the  Company  is  likely  to  receive  revenues  from  product  sales or
royalties.  To date,  substantially all of the Company's  revenues have resulted
from  payments  made  under the SB  Collaboration  Agreements  and,  to a lesser
extent, from other collaboration,  option and licensing agreements.  The Company
expects that most of its revenues  for the  foreseeable  future will result from
payments under collaboration  agreements  previously entered into, including the
New Collaboration  Partner Agreements.  The Company expects to continue to incur
substantial expenses relating to its research and development efforts, which are
expected to increase  relative to  historical  levels as the Company  focuses on
preclinical  and clinical  trials  required for the  development  of therapeutic
protein product candidates.  As a result, the Company expects to incur continued
and  increasing  losses over the next several years unless it is able to realize
additional revenues under existing or new collaboration agreements. There can be
no assurance that the Company will receive  milestone and royalty payments under
the SB Collaboration  Agreements,  the New Collaboration  Partner  Agreements or
other collaboration agreements, or that the Company will ever be profitable. See
"-- Relationship With SmithKline Beecham and Other Collaborators."

                                       6
<PAGE>



         Since inception,  the Company has expended,  and expects to continue to
expend,  substantial funds to continue its research and development programs. In
the event of  unanticipated  expenses  or delays in  receipt  of  revenues,  the
Company may, in the future,  require additional  financing to fund its operating
expenses and capital  requirements.  There can be no assurance  that  additional
financing will be available on acceptable  terms or at all in the event that the
Company  requires  additional  funding to conduct its operations.  If additional
funds are raised by issuing equity securities,  further dilution to the existing
stockholders may result.

         RELATIONSHIP  WITH  SMITHKLINE  BEECHAM  AND OTHER  COLLABORATORS.  The
Company  is   substantially   dependent  on  SmithKline   Beecham  and  the  New
Collaboration  Partners  for  research,  development  and  commercialization  of
products  pursuant to the SB Collaboration  Agreements and the New Collaboration
Partner  Agreements,  and  on  other  collaborators.   Under  the  collaboration
agreements,  the  Company  has agreed to  restrictions  on  entering  into other
collaboration  agreements in certain significant fields,  including restrictions
on entering  into new  collaboration  agreements  granting  rights to Human Gene
Technology in the fields covered by the SB Collaboration Agreements.  SmithKline
Beecham and other  collaborators will have the right to control the development,
regulatory  approval and marketing of any products developed by them under these
collaboration  agreements.  If SmithKline Beecham or other collaborators fail to
develop  marketable   products,   to  obtain  regulatory  approvals  for  or  to
successfully  market products based on the genes identified by the Company,  the
Company's  ability to  achieve  profitability  could be  delayed  or  materially
adversely affected.

         The Company has entered  into  collaboration  agreements  with  several
companies with respect to  development of products based on genes  discovered by
the Company in certain areas not covered by the SB Collaboration  Agreements and
has also entered into  material  transfer  agreements  with a number of academic
institutions. In connection with these agreements, the Company is dependent upon
the success of these outside parties in performing their responsibilities.

         Conflicts  of  interest   could  arise  between  the  Company  and  its
collaborators.  Each  of the  Company's  collaborators  is  conducting  multiple
product development efforts. The Company's  collaborators may pursue existing or
alternative  technologies  in preference to products being  developed  under the
collaboration  agreements  with the  Company,  and this  could  have a  material
adverse  impact on the  Company's  receipt of  milestone  and royalty  revenues.
Additionally,  the  Company's  collaborators  may develop,  either alone or with
others,  products  that are similar to or in  competition  with  products  being
developed under collaboration agreements with the Company.

         PRODUCT  DEVELOPMENT  RISKS. The Company has recently begun to focus an
increasing  amount of its resources on the  development of  therapeutic  protein
product candidates.  The Company's ability to develop and commercialize products
based on therapeutic  proteins and, in the future, other products as to which it
has retained the rights to commercialize on its own will depend on the Company's
ability to develop internally product development,  preclinical  development and
testing,  clinical,  regulatory,  sales and marketing  resources,  or enter into
arrangements with third parties to provide such functions.  The Company has only
recently  commenced  such  product  development  activities,   and  has  limited
experience in connection with these  activities.  There can be no assurance that
the Company will be successful in developing

                                       7
<PAGE>



such resources or entering into  agreements  with third  parties.  Additionally,
there  can be no  assurance  that  the  Company  will  be  able  to  enter  into
collaboration agreements with respect to products being developed by the Company
on  favorable  terms,  to the extent that the  Company  seeks to enter into such
agreements.

         In  addition,   the  Company  has  limited   experience  in  conducting
preclinical  and clinical  development  activities  and intends to rely in large
part  on  its   collaborative   partners  and  third  party  clinical   research
organizations  to design and conduct most of such activities,  if required.  The
Company's  inability  to  contract  for any  necessary  clinical  activities  on
acceptable terms would impair or delay the Company's ability to complete product
development,  which  could  have a  material  adverse  effect  on  the  Company.
Moreover,  the Company's  reliance upon such collaborators and third parties for
preclinical  and  clinical  development  activities  will  reduce the  Company's
control  over such  activities  and will make the  Company  dependent  upon such
parties.

         COMPETITION. There is a finite number of genes in the human genome, and
the Company believes that the majority of such genes have been identified by the
Company or others  conducting  genomic  research and that  virtually all will be
identified within several years.  While the Company's goal has been to identify,
establish  the  utility  of and  ultimately  patent  as many  genes as it can as
rapidly as possible,  the Company  continues to face substantial  competition in
these  efforts both from  entities  using high  throughput  gene  sequencers  to
discover  genes,  as well as from  entities  using more  traditional  methods to
discover  genes related to particular  diseases.  Research to identify  genes is
also  being  conducted  by various  institutes  and  United  States and  foreign
government-financed  entities,  including British,  French,  German and Japanese
efforts, as well as numerous smaller  laboratories  associated with universities
or other  not-for-profit  entities.  In addition, a number of pharmaceutical and
biotechnology companies and government-financed  programs are engaged in or have
announced the intention to engage in areas of human genome  research  similar to
or competitive  with the Company's focus on gene discovery,  and other companies
are likely to enter the field. The gene sequencing  machines used by the Company
are  commercially  available  and are  currently  being  utilized  by many other
companies,  in some cases for business  purposes  competitive  with those of the
Company. In addition, a number of other companies have announced plans to engage
in gene discovery and could acquire similar machines and develop  procedures for
automated  sequencing  of genes.  Although the Company  believes  that its large
scale,  automated  processes  and  lead  time  provide  it  with  a  competitive
advantage,  any one of  these  companies  or other  entities  may  discover  and
establish a patent position in one or more genes that the Company has identified
and might have designated or considered designating as a product candidate.  Any
potential   products  based  on  genes  identified  by  the  Company  will  face
competition  both  from  companies  developing   gene-based  products  and  from
companies  developing  other forms of treatment  for diseases that may be caused
by, or related to, genes identified by the Company.

         The  Company's  potential   competitors   include   pharmaceutical  and
biotechnology  firms and other  companies,  not-for-profit  entities  and United
States   and   foreign   government-financed   programs,   many  of  which  have
substantially   greater  research  and  product  development   capabilities  and
financial,  scientific,  marketing and human  resources than the Company.  These
competitors may succeed in identifying genes or developing products earlier than
the Company or its  collaborators,  obtaining  approvals  from the United States
Food and Drug  Administration  (the "FDA") or other regulatory agencies for such
products more rapidly than the Company or its

                                       8
<PAGE>



collaborators,  or  developing  products  that are  more  effective  than  those
proposed to be developed by the Company or its  collaborators.  Certain of these
competitors  may be further  advanced than the Company in  developing  potential
products that may compete with potential  products of the Company.  There can be
no  assurance  that  research  and  development  by others  will not  render the
products that the Company or its  collaborators  may seek to develop obsolete or
uneconomical  or result in  treatments,  cures or  diagnostics  superior  to any
therapy or diagnostics  developed by the Company or its  collaborators,  or that
any therapy or diagnostics developed by the Company or its collaborators will be
preferred to any existing or newly developed  technologies.  The Company expects
that competition in this field will intensify.

         TECHNOLOGICAL  UNCERTAINTY;   RISK  OF  OBSOLESCENCE.   Development  of
products based on genes discovered by the Company is still in an early stage and
will require significant further research,  development,  testing and regulatory
approvals and is subject to the risks of failure  inherent in the development of
products based on innovative  technologies  and the risks  associated  with drug
development  generally.  These  risks  include  the  possibilities  that:  these
technologies or any or all of the products based on these  technologies  will be
found to be  ineffective  or  toxic,  or  otherwise  fail to  receive  necessary
regulatory clearances; the products, if safe and effective, will be difficult to
manufacture on a large scale or  uneconomical to market;  proprietary  rights of
third  parties will  preclude the Company or its  collaborators  from  marketing
products; or third parties will market superior or equivalent products.

         To date, relatively few products based on genes have been developed and
commercialized. Even if the Company identifies a gene and determines that it has
potential commercial value, the Company and its collaborators may not be able to
develop  a  commercially  feasible  product  based  on the  gene or the  protein
expressed  by the  gene.  Certain  areas  of  drug  discovery  conducted  by the
Company's  collaborators,  including  gene  therapy,  and other  areas,  such as
antisense drugs,  involve new technologies,  and existing data on the safety and
efficacy  of these  technologies  is very  limited.  At  present,  there  are no
products for patient use that have been  developed  from these  technologies  or
that have received FDA approval.  Several significant scientific challenges must
be  addressed  before the  therapeutic  potential of these  technologies  can be
commercially  realized.  The Company and its licensees or collaborators will not
be  able to  commercialize  any  products  for a  number  of  years,  if at all.
Additionally,  the areas in which the Company or its licensees or  collaborators
plan to develop  products  are new and  rapidly  evolving,  and are  expected to
continue  to  undergo  significant  and  rapid  technological   changes.   Rapid
technological development could result in actual and proposed products, services
or processes becoming obsolete before the Company recovers a significant portion
of its related research, development and capital expenses. In addition, new gene
sequencing  machines are being developed,  and, depending on the conditions upon
which they are made  available,  there can be no assurance that the Company will
be able to  obtain  access  to those  new  machines.  The  introduction  of gene
sequencing  machines  that  embody  new and  superior  technology  could  render
obsolete the gene  sequencers  used by the Company.  The  Company's  competitive
position would be adversely affected if it were unable to anticipate such future
developments and obtain access to the new technology.

         PATENTS AND PROPRIETARY  RIGHTS.  The Company's  commercial  success is
dependent in part on its ability to obtain patent protection on genes discovered
by it. The Company applies for patent protection for genes identified by partial
sequencing and, subsequently, for those genes

                                       9
<PAGE>



which it fully sequences.  However,  there is substantial  uncertainty as to the
patentability of genes based on partial sequences.  Even if patent protection is
afforded  for  such  sequences,   it  may  not  provide   effective   commercial
exclusivity.  While the Company's business might be enhanced by obtaining patent
protection  based on partial gene  sequences,  the Company does not believe that
its commercial success will be materially dependent on its ability to do so. The
Company has isolated and obtained  full-length  sequence information for many of
the genes that the Company or its  collaborators  intend to develop  further and
has  filed,  and  continues  to  file,  for  patent  protection  based  on  such
full-length sequences. However, the Company does not expect to isolate and fully
sequence a significant portion of the partial gene sequences it discovers.

         The  patent  positions  of  biotechnology  firms  generally  are highly
uncertain  and  involve  complex  legal  and  factual  questions.   There  is  a
substantial  backlog of biotechnology  patent  applications at the United States
Patent and Trademark Office ("PTO"),  and no clear policy has emerged  regarding
the breadth of claims  covered in  biotechnology  patents.  There have been, and
continue to be, intensive discussions on the scope of patent protection for both
gene fragments and full-length  genes. There have also been proposals for review
of the  appropriateness of patents on genes and gene fragments.  There can be no
assurance  that  these or other  proposals  will not  result in  changes  in, or
interpretations  of, the patent laws which will  adversely  affect the Company's
patent position. The biotechnology patent situation outside the United States is
even more  uncertain  and is  currently  undergoing  review and revision in many
countries.

         As of February 15, 1997,  the Company had filed  United  States  patent
applications  with  respect to more than 230  full-length  human genes and their
corresponding proteins. The Company has also filed U.S. patent applications with
respect to all or portions of genomes of five infectious  microorganisms and one
non-infectious  microorganism.  As of February  15,  1997,  the Company has five
issued U.S. patents covering  full-length human genes, which expire between 2013
and 2014.  There can be no assurance  that the remaining  applications  covering
full- length genes and their corresponding  proteins will result in the issuance
of any patent. While the Company identifies multiple uses for genes it has fully
sequenced,  these uses may not be sufficient to meet the statutory  requirements
for patentability in all cases. Additionally,  in view of the substantial number
of genes that may be covered by the Company's patent  applications,  the Company
cannot  predict what issues may arise in connection  with the  Company's  patent
applications or the timing of the grant of patents with respect to genes covered
by such patent applications. Moreover, in certain instances, the Company will be
dependent upon its collaborators to file and prosecute patent applications.

         The Company has also filed U.S. patent applications  claiming more than
190,000 partial human gene sequences. These applications seek to protect partial
human and non-human gene sequences,  the full-length gene sequences that include
the partial sequences,  as well as products derived therefrom and uses therefor.
These applications  identify possible biological functions for some of the genes
based in part on a comparison to genes included in public databases,  but do not
contain  any  laboratory  or  clinical  data  with  respect  to such  biological
functions.  There are certain court  decisions  indicating  that disclosure of a
partial  sequence  may not be  sufficient  to  support  the  patentability  of a
full-length sequence. In view of these court decisions,  as well as the position
of the PTO referred to below,  the Company  believes  that there is  significant
risk that patents will not issue based on patent disclosures  limited to partial
gene sequences. Finally, even

                                       10
<PAGE>



if patents issue on the basis of partial gene sequences, there is uncertainty as
to the scope of the coverage,  enforceability or commercial  protection provided
by any such patents.

         In June 1991,  the  National  Institutes  of Health (the "NIH") filed a
patent  application  seeking  protection for a substantial number of genes based
upon partial gene sequences.  The application generated substantial  controversy
in the scientific  community  regarding the  patentability of gene fragments and
the full-length gene based on only partial sequencing of genes,  particularly in
cases where the biological  function of the full-length  gene is not identified.
An  examiner  in the  PTO  rejected  the  patent  claims  contained  in the  NIH
application and the rejection was not appealed by the NIH. The Company  believes
that the  patent  applications  that have  been  filed by the  Company  based on
partial gene sequences may be considered similar to the application filed by the
NIH.  To date,  the Company  has not  received  notice from the PTO of a similar
rejection of its patent applications covering partial gene sequences.

         Publication  of  information  concerning  genes  prior  to the time the
Company  applies  for  patent  protection  based on the  full-length  gene could
adversely affect the Company's  ability to obtain patent protection with respect
to genes  identified by it.  Washington  University has identified genes through
partial sequencing pursuant to funding provided by Merck & Co. and has deposited
the partial sequences identified in a public database.  See "-- Competition." In
July 1994,  the Company,  TIGR and  SmithKline  Beecham  reached an agreement to
contribute  a number of partial cDNA  sequences  to a database  (the "Human cDNA
Database").  Pursuant to the  agreement,  the Human cDNA  Database is accessible
only to academic scientists and researchers at non-profit institutions that sign
access  agreements.  In October 1996, TIGR notified  SmithKline  Beecham and the
Company of its decision to terminate the Human cDNA Database Agreement according
to its terms,  effective in April 1997.  TIGR and  researchers  who are provided
access to  proprietary  data in the Human cDNA Database  have certain  rights to
publish human cDNA sequences in which the Company has rights. The termination of
the Human cDNA Database  Agreement in April 1997 will  eliminate  limitations on
publication of those sequences in the Human cDNA Database as of that date. While
the Company  believes that the  limitations  on  publication of sequences in the
Human cDNA  Database  have  generally  been  sufficient to permit the Company to
apply for  patent  protection  on genes in which it is  interested  in  pursuing
further  research,  there can be no  assurance  that such  publication  will not
affect the Company's ability to obtain patent protection for some genes in which
it may have an interest.

         In January 1997,  TIGR, in  collaboration  with the National Center for
Biological  Information (NCBI),  disclosed  full-length DNA sequences (which are
reportedly in excess of 35,000 sequences)  assembled from partial gene sequences
(EST's)  available in publicly  accessible  databases or sequenced at TIGR. Such
disclosure  might  limit the scope of  claims  or make  unpatentable  subsequent
patent applications on full length genes filed by the Company which, in the case
of genes of commercial significance, could have a material adverse effect on the
Company.  See  "--  Relationship  with  TIGR;  Funding  Obligations;   Potential
Dispute."

         In  addition,  others  have  filed and are likely to file in the future
patent  applications which have not yet been published covering genes or protein
sequences similar or identical to those of the Company.  Moreover, the number of
patent  applications  covering  genes and  proteins  expressed by genes has been
increasing, and is expected to continue to increase, as a result of the increase
in the number of entities conducting genomic research. See "-- Competition." The

                                       11
<PAGE>



Company has been notified that there may be patent  applications filed by others
which  cover  genes for which the Company  has filed  patent  applications.  The
priority  of  competing  patent  claims  would  be  decided  in an  interference
proceeding  before  the PTO.  No  assurance  can be given  that any such  patent
application  of third parties will not have  priority  over patent  applications
filed by the Company or that any patent  applications  filed by the Company will
result in issued patents.

         The Company is aware that patent applications have been filed by one or
more third  parties with respect to three of the Company's  therapeutic  protein
product  candidates.  The Company has been  granted a patent with respect to DNA
sequences encoding one of the three therapeutic proteins.  However,  proceedings
may be instituted in the PTO to determine  which of the Company or a third party
is entitled to a United States patent  covering such protein and/or DNA encoding
such protein. As to the remaining two therapeutic proteins, the Company has been
notified that the PTO is considering  instituting proceedings to determine which
of the  Company  or a third  party  is  entitled  to a patent  covering  the DNA
encoding one of such therapeutic  proteins,  and it is possible that proceedings
may be instituted as to the third therapeutic protein.

         Accordingly,  there can be no  assurance  that  patents  issued and any
additional patents, if issued, will provide commercially  meaningful  protection
against  competitors.  There can also be no assurance  that any patent issued to
the  Company  will  provide  it with  competitive  advantages,  or  will  not be
challenged by others.  Furthermore,  there can be no assurance  that others will
not independently develop similar products which could result in an interference
proceeding in the PTO.  Others may be able to design  around  issued  patents or
develop  products  providing  similar effect to products being  developed by the
Company  based on genes or proteins  expressed by genes which are not covered by
patents issued to the Company.  In addition,  others may discover uses for genes
or proteins other than those uses covered in the Company's patent  applications,
and these other uses may be separately patentable. In such case, the holder of a
use patent  covering an invention as to which the Company has a  composition  of
matter  patent claim could  exclude the Company from selling a product for a use
covered by such use patent.

         The  Company's  potential  products may conflict with patents that have
been  or  may  be  granted  to  competitors,  universities  or  others.  As  the
biotechnology  industry  expands and more patents are issued and other companies
engage in the  business  of  discovering  genes  through  the use of high  speed
sequencers,  the risk increases that the Company's  potential  products may give
rise to claims  that they  infringe  the patents of others.  Such other  persons
could bring legal actions  against the Company  claiming  damages and seeking to
enjoin clinical testing,  manufacturing and marketing of the affected  products.
If any such actions are successful,  in addition to any potential  liability for
damages,  the Company could be required to obtain a license in order to continue
to manufacture or market the affected  products.  There can be no assurance that
the Company would prevail in any such action or that any license  required under
any such  patent  would be made  available  on  acceptable  terms.  The  Company
believes that there will continue to be  significant  litigation in the industry
regarding patent and other intellectual  property rights. If the Company becomes
involved  in such  litigation,  it could  consume a  substantial  portion of the
Company's resources.


                                       12
<PAGE>



         In addition,  some of the genes  (representing  a small  percentage  of
sequences  covered by the Company's patent filings) covered by two of the patent
applications  in which  the  Company  has  rights  that  have  been  filed  were
identified  pursuant  to  research  funded  by  grants  from the  United  States
Department of Energy ("DOE").  TIGR is also receiving  funding from the DOE with
respect to certain  non-pathogenic  bacterial genomes it is sequencing.  The DOE
has a statutory right under certain  circumstances  (including lack of action on
the part of the holder of the patent rights to achieve practical  application of
the  invention  or a need to  alleviate  public  health or safety  concerns  not
reasonably  satisfied  by the  holder of the  patent  rights)  to grant to other
parties licenses under the patents which may be granted based on research funded
by the DOE.

         The Company also relies on trade secret protection for its confidential
and proprietary  information.  The Company believes it has developed proprietary
procedures for making cDNA libraries and  sequencing  and analyzing  genes.  The
Company has not sought patent protection for these procedures. Additionally, the
Company has developed a substantial  database concerning genes identified by it.
The Company has taken  security  measures to protect its data and  continues  to
explore  ways to further  enhance  the  security  for its data.  However,  trade
secrets  are   difficult  to  protect.   While  the  Company  has  entered  into
confidentiality  agreements  with employees and academic  collaborators  who are
provided data or materials under material transfer  agreements,  there can be no
assurance that such data or material will not be disclosed, that others will not
independently  develop  substantially  equivalent  proprietary  information  and
techniques or otherwise  gain access to the Company's  trade secrets or disclose
such technology, or that the Company can meaningfully protect its trade secrets.
In addition, certain trade secrets important to the Company's business have been
developed  by,  or  are  in  the  possession  of,  TIGR,  including  information
concerning  sequencing  procedures and genes  identified by TIGR.  Although TIGR
also enters into  confidentiality  agreements  with its  employees,  there is an
additional risk that such trade secrets cannot be meaningfully protected.

         RELATIONSHIP WITH TIGR; FUNDING  OBLIGATIONS;  POTENTIAL  DISPUTE.  The
Company has committed to pay TIGR  approximately $85 million during the ten-year
period ending  September 30, 2002,  approximately  $44 million of which had been
paid through  February  15,  1997.  In return,  the Company  received  exclusive
proprietary  rights to the intellectual  property resulting from TIGR's research
through  September 30, 2002.  Under the  Company's  agreements  with TIGR,  TIGR
generally has the right to direct its research activities independently from the
Company and there can be no assurance  that TIGR will conduct  research in areas
of interest to the Company.  The Company's  substantial  financial commitment to
fund TIGR's research continues regardless of whether the Company requires TIGR's
services or derives useful information therefrom.

         The Company's agreements with TIGR include  non-disclosure  obligations
on the  part of  TIGR.  The  Company  and TIGR  have  had  recent  disagreements
concerning  the scope of these  non-disclosure  obligations.  It has come to the
Company's  attention  that  certain  disclosures  by TIGR of sequence  and other
information  which  the  Company  believes  may  violate  such  non-  disclosure
obligations may have taken place or may take place in the future.  Disclosure of
information  by  TIGR  in  violation  of  its  non-disclosure   obligations  may
negatively   affect  the  Company's  ability  to  obtain  patent  protection  on
inventions  described  therein.  The Company is investigating this situation and
will determine what action, if any, should be taken to prevent

                                       13
<PAGE>



such  disclosures.  See "-- Patents  and  Proprietary  Rights."  There can be no
assurance  that these  disagreements  will not  materially  affect the Company's
relationship with TIGR. However,  TIGR has been primarily  sequencing  microbial
genes and not human genes in recent years, and the Company does not believe that
it is or will be dependent on TIGR.

         DEPENDENCE UPON KEY PERSONNEL. The Company is dependent on its Chairman
and Chief Executive  Officer,  William A. Haseltine,  Ph.D., and its Senior Vice
President,  Research  and  Development,  Craig A. Rosen,  Ph.D.  The Company has
entered into  employment  agreements  with each of Drs.  Haseltine and Rosen for
terms expiring in February 2000 and November 1997,  respectively.  Each of these
employment agreements automatically renews for a one year term unless terminated
by either party. The Company has not purchased  key-man life insurance on either
Dr. Haseltine or Dr. Rosen.  Competition among  pharmaceutical and biotechnology
companies  for  qualified  employees  is  intense,  and the  loss  of  qualified
employees,  or an inability to attract,  retain and motivate  additional  highly
skilled employees required for the expansion of the Company's activities,  could
adversely affect its business and prospects.  There can be no assurance that the
Company  will be able to retain its  existing  personnel  or to find and attract
additional qualified employees.

         UNCERTAINTY OF GOVERNMENT  REGULATORY  REQUIREMENTS;  LENGTHY  APPROVAL
PROCESS; NO ASSURANCE OF PRODUCT APPROVAL. Products such as those proposed to be
developed  by the  Company or its  collaborators  are  subject  to an  extensive
regulatory  approval  process  by the  FDA  and  comparable  agencies  in  other
countries.  The U.S.  government  has recently  established  a working  group to
assess  whether  additional  regulation  in the area of genetic  testing  may be
appropriate,  which may ultimately result in further regulation.  The regulation
of new  therapeutic  products and  diagnostics  is  extensive,  and the required
preclinical and clinical  testing is lengthy and expensive.  There can therefore
be no assurance that FDA approvals  will be obtained in a timely  manner,  if at
all.  The  Company or its  collaborators  may  encounter  significant  delays or
excessive costs in their efforts to secure necessary approvals or licenses. Even
if  FDA  regulatory  approvals  are  obtained,  the  FDA  extensively  regulates
manufacturing,  labeling,  distributing,  marketing,  promotion and  advertising
after  product  approval.  Moreover,  several  areas in which the Company or its
collaborators  may develop products  involve  relatively new technology and have
not been the subject of extensive product testing in patients.  Accordingly, the
regulatory  requirements governing such products and related clinical procedures
are uncertain and such products may be subject to substantial  additional review
by various  governmental  regulatory  authorities,  which could prevent or delay
regulatory  approval.  Regulatory  requirements  ultimately imposed on these and
other areas could  adversely  affect the Company's  ability to clinically  test,
manufacture or market products.

         The Company is also subject to regulation  under state and federal laws
regarding environmental protection and hazardous substances control. The Company
believes  it  is  in  material  compliance  with  applicable  laws  relating  to
environmental protection and hazardous substances control. The impact that these
laws or any changes in these laws may have on future  operations  of the Company
cannot be  predicted.  Moreover,  federal and state  agencies and  congressional
committees have expressed interest in further  regulation of biotechnology.  The
Company  is unable to  estimate  the  extent  and  impact of  regulation  in the
biotechnology  field  (including  genetic  testing)  resulting  from any  future
federal, state or local legislation or administrative action.

                                       14
<PAGE>



         DEPENDENCE UPON THIRD PARTIES FOR SUPPLY.  The Company currently relies
on  a  single  supplier,   Applied   Biosystems,   a  division  of  Perkin-Elmer
Corporation, to provide all of its gene sequencing machines and certain reagents
required  in  connection  with the gene  sequencing  process.  While  other gene
sequencing machines are available,  the Company does not believe that such other
machines  are as efficient as the  machines  currently  used by the Company.  No
assurance can be given that either the gene sequencing  machines or the reagents
will remain available in commercial  quantities at acceptable costs.  Should the
Company  be  unable to  obtain  additional  machines  or an  adequate  supply of
reagents or other  ingredients at commercially  reasonable rates, its ability to
continue to identify genes through gene sequencing would be adversely affected.

         The Company has contracted for the manufacture of therapeutic  proteins
for preclinical  testing and clinical  development from a single  supplier.  The
supplier is a recently  organized  entity which will manufacture the therapeutic
proteins in a new cGMP manufacturing  facility. The Company will be dependent on
this  company for its supply of  therapeutic  proteins.  Any failure or delay in
supplying  therapeutic proteins could affect the timing of preclinical tests and
clinical trials and could delay submission of products for regulatory approval.

         NO  MANUFACTURING  OR  MARKETING  CAPACITY.  The Company has  developed
in-house  capabilities  for  the  production  and  purification  of  recombinant
proteins for use in its research  activities,  but does not  currently  have any
manufacturing  facilities  capable of supplying  materials suitable for clinical
trials or for  commercial  sale or any  experience  in  manufacturing  materials
suitable for  clinical  trials or for  commercial  sale.  In the near term,  the
Company  intends  to rely on third  parties  for  production  of  certain of its
therapeutic proteins for use in pre- clinical and early clinical development and
has entered into an agreement with a third party to supply such  materials.  The
Company   will  depend  on  such  third  party  to  comply  with   current  good
manufacturing  practices  ("cGMPs")  and other  regulatory  requirements  and to
deliver  materials on a timely basis;  however,  there can be no assurance  that
such party will  perform.  Any  failures  by third  parties  may delay  clinical
development or the submission of products for regulatory approval,  or otherwise
impair the Company's competitive  position,  which could have a material adverse
effect on the Company's business.

         The Company is planning the  construction  of a pilot scale  production
and  process  development   facility  for  the  preparation  of  clinical  trial
quantities of its therapeutic proteins in compliance with cGMP requirements. The
Company  has  completed  the  conceptual  design  and has begun the  preliminary
engineering design and site selection process. Construction is expected to begin
by mid 1997 and be completed in mid to late 1998.  The facility will be designed
to allow for the production and purification of multiple  recombinant  proteins.
The Company  intends to use the  facility  for  production  of  preclinical  and
clinical  supplies of its therapeutic  proteins and for process  development and
scale-up.  A delay in completion of the facility could adversely affect the cost
and timing of  clinical  trials  and could  delay  submission  of  products  for
regulatory  approval.  Moreover,  the  Company  intends to seek  financing  with
respect to all or a portion of the  estimated $40 million  construction  cost of
such facility. There can be no assurance that the Company will be able to obtain
any such financing on terms  acceptable to the Company,  or at all. In the event
that financing is not available on acceptable  terms,  the Company may determine
to use its own capital resources to finance all or a portion of the cost of such
facility.

                                       15
<PAGE>



         The   Company's   long  range  plan  is  to   establish   manufacturing
capabilities to allow it to meet its clinical trial and commercial manufacturing
requirements.  However,  the Company may contract with third party manufacturers
or  develop   products  with  partners  and  take  advantage  of  the  partner's
manufacturing  capabilities.  There can be no assurance that the Company will be
able to successfully  establish  manufacturing  capabilities and manufacture its
products   economically  or  in  compliance  with  cGMPs  and  other  regulatory
requirements.

         The Company  generally expects to rely on its collaborators or on third
parties  with whom the Company may  contract to market any  products.  In either
case,  the  Company  will be  dependent  on such third  parties  for  marketing.
However,  in the future,  the  Company may co- promote or retain U.S.  marketing
rights to certain  of its  products.  Significant  additional  expenditures  and
management  resources  will be required  to develop an external  sales force and
implement  its  marketing  strategy  if the Company  decides to market  products
directly.  There can be no assurance that the Company's  collaborators  or other
third parties will be successful in marketing products, or that the Company will
be able to establish a successful marketing force.

         UNCERTAINTY RELATED TO CHANGES IN THE HEALTHCARE SYSTEM;  REIMBURSEMENT
POLICIES.  In recent  years,  there have been  numerous  proposals to change the
healthcare  system in the United States.  Some of these  proposals have included
measures that would limit or eliminate  payments for certain medical  procedures
and treatments or subject the pricing of pharmaceuticals to government  control.
In addition,  significant  uncertainty exists as to the reimbursement  status of
newly-approved healthcare products.  Government and other third-party payors are
increasingly  attempting to contain  healthcare  costs by limiting both coverage
and the level of reimbursement of new therapeutic and diagnostic products and by
refusing,  in some cases,  to provide any coverage of uses of approved  products
for disease indications other than those for which the FDA has granted marketing
approval.  It is uncertain  what  legislative  proposals will be adopted or what
actions  Federal,  state or private payors for healthcare goods and services may
take to limit their  payments for such goods and  services.  The Company  cannot
predict  the  effect  that  changes  in the  healthcare  system  may have on its
business,  and no  assurance  can be given that any such changes will not have a
material adverse effect on the Company.

         VOLATILITY  OF STOCK PRICE.  The market  prices for  securities of both
emerging and  biotechnology  companies,  including the market price of shares of
the Company's  Common Stock,  have  historically  been highly  volatile.  Future
announcements  concerning the Company or its competitors,  including the results
of clinical  testing,  technological  innovations  or new  commercial  products,
changes in government regulations, regulatory actions, announcements relating to
healthcare reform,  developments  concerning proprietary rights,  litigation and
public   concern  as  to  safety  of  the   Company's   products,   as  well  as
period-to-period  variances in financial results could cause the market price of
the Common Stock to fluctuate  substantially.  In addition, the stock market has
experienced  extreme  price  and  volume  fluctuations  that  have  particularly
affected the market price for many emerging and biotechnology companies and that
have often been unrelated to the operating performance of these companies. These
broad market  fluctuations  may adversely  affect the market price of the Common
Stock.

         SHARES  AVAILABLE FOR RESALE.  All of the  22,078,936  shares of Common
Stock that are outstanding are eligible for immediate sale in the public market,
subject in the case of  approximately  6,628,616 such shares to compliance  with
the provisions of Rule 144 under the

                                       16
<PAGE>



Securities Act of 1933, as amended (the "Securities Act"). Additionally, holders
of 6,075,760  shares of Common  Stock or warrants to purchase  Common Stock have
registration rights with respect to such shares. Sales of substantial amounts of
Common Stock pursuant to Rule 144 or otherwise may have an adverse effect on the
market price of the Common Stock.

SAFE HARBOR STATEMENT UNDER THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

         Certain statements contained in "The Company",  and "Risk Factors" such
as statements  concerning future collaboration  agreements,  royalties and other
payments under collaboration  agreements,  and product development and sales and
other  statements  contained  herein  regarding  matters that are not historical
facts are forward looking statements;  actual results may differ materially from
those  projected in the forward looking  statements,  which  statements  involve
risks and  uncertainties,  including  but not  limited  to, the  following:  the
scientific progress of the Company in its research and development programs; the
magnitude of these programs;  the ability of the Company to establish additional
collaborative  and  licensing  arrangements;  the  extent to which  the  Company
engages  in  clinical  development  of any  products  on its own;  the scope and
results of pre-clinical testing and clinical trials; the time and costs involved
in obtaining  regulatory  approvals;  the costs  involved in preparing,  filing,
prosecuting,  maintaining and enforcing patent claims;  competing  technological
and market  developments;  and whether  conditions to milestone payments are met
and the timing of such  payment.  Investors are also directed to the other risks
discussed  herein under "Risk  Factors," in the Company's  Annual Report on Form
10-K and in other documents filed by the Company with the Commission.




                                       17
<PAGE>



                             SELLING SECURITYHOLDER

         The  following  table sets forth  certain  information  as of March 31,
1997, hereof, with respect to the Common Stock held by the Selling  Stockholder.
Except  as set forth  below,  the  Selling  Stockholder  has not had a  material
relationship with the Company within the past three years other than as a result
of the  ownership  of the  Common  Stock.  The  Common  Stock  offered  by  this
Prospectus may be offered from time to time by the Selling Stockholder:

                    Number of Shares of
Name                 Beneficially Owned        Percentage of    Number of Shares
and Address            Common Stock         Shares Outstanding   Being Offered
- -----------            ------------         ------------------   -------------

Bear Stearns             86,181(1)                   *               50,871(1)
International
Limited
One Canada Square
London E14 5AD
England

*          less than 1%

(1)      Includes  50,871  shares  issuable on  exercise of Warrants  which were
         purchased from HealthCare Ventures III, L.P. ("HCV III") and HealthCare
         Ventures IV, L.P. ("HCV IV") on October 28, 1996.  James  Cavanaugh,  a
         director of the Company, is a general partner of the general partner of
         HCV III and HCV IV. The shares  included  in the table as  beneficially
         owned by the  Selling  Stockholder  exclude  shares held in the name of
         Bear Stearns Securities Corp., an affiliate of the Selling Stockholder,
         which are not held in discretionary or custodial accounts

         Bear, Stearns & Co., Inc. ("Bear Stearns"),  an affiliate of the Seller
Stockholder,  was  one of the  representatives  of the  underwriters  in  public
offerings of the Company's  securities  commenced on December 1, 1993, September
28, 1995 and March 13, 1997. In addition, Bear Stearns acts as a market-maker in
the shares of the Common Stock of the Company.

         The Selling Stockholder may offer all or part of the Common Stock which
they hold pursuant to the offering  contemplated by this Prospectus.  Therefore,
no estimate  can be given as to the amount of Common  Stock that will be held by
the Selling Stockholder upon completion of such offering.

                              PLAN OF DISTRIBUTION

         The Common Stock may be sold from time to time to  purchasers  directly
by the Selling Stockholder. Alternatively, the Selling Stockholder may from time
to time offer the Common Stock through underwriters,  dealers or agents, who may
receive  compensation  in the form of  underwriting  discounts,  concessions  or
commissions from the Selling  Stockholder  and/or the purchasers of Common Stock
for whom they may act as agent.  The Selling  Stockholder and any  underwriters,
dealers or agents that participate in the distribution of Common Stock may be

                                       18
<PAGE>



deemed to be  underwriters,  and any profit on the sale of Common  Stock by them
and any discounts, commissions or concessions received by any such underwriters,
dealers or agents might be deemed to be  underwriting  discounts and commissions
under the  Securities  Act. At the time a  particular  offer of Common  Stock is
made, to the extent required, a Prospectus  Supplement will be distributed which
will set  forth the terms of the  offering,  including  the name or names of any
underwriters,  dealers or agents,  any  discounts,  commissions  and other items
constituting  compensation  from  the  Selling  Stockholder  and any  discounts,
commissions or concessions allowed or reallowed or paid to dealers.

         The  Common  Stock  may be  sold  from  time  to  time  in one or  more
transactions  at a fixed  offering  price,  which may be changed,  or at varying
prices  determined  at the time of sale or at  negotiated  prices.  From time to
time, the Selling  Stockholder  may engage in short sales, or short sales versus
the box, and may sell and deliver the shares being offered  hereby in connection
therewith. In addition, the Selling Stockholder may sell such shares through the
writing of options  (whether  such options are listed on an options  exchange or
otherwise) on the shares, and in privately negotiated transactions.

         The Company will pay  substantially all of the expenses incident to the
offering and sale of the Common Stock to the public other than  commissions  and
discounts of underwriters,  dealers or agents.  Under an agreement  entered into
with the Company, the Selling Stockholder, and any underwriter they may utilize,
will be indemnified by the Company against certain civil liabilities,  including
liabilities under the Securities Act.

                                 USE OF PROCEEDS

         The Common Stock offered hereby are offered by the Selling Stockholder.
See "Selling  Securityholder"  and "Plan of Distribution".  The Company will not
receive any proceeds from the sale of the Common Stock.



              DISCLOSURE OF COMMISSION POSITION ON INDEMNIFICATION
                         FOR SECURITIES ACT LIABILITIES

         The Certificate of Incorporation and By-Laws of the Registrant  provide
that the Company shall indemnify any person to the full extent  permitted by the
Delaware General  Corporation Law (the "GCL").  Section 145 of the GCL, relating
to indemnification, is hereby incorporated herein by reference.

         In accordance  with Section  102(a)(7) of the GCL, the  Certificate  of
Incorporation of the Registrant  eliminates the personal  liability of directors
to the Company or its  stockholders for monetary damages for breach of fiduciary
duty as a  director  with  certain  limited  exceptions  set  forth  in  Section
102(a)(7).

         Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors,  officers or persons  controlling the Company
pursuant to the foregoing provisions,  the Company has been informed that in the
opinion of the Securities and Exchange

                                       19
<PAGE>

Commission  such  indemnification  is against  public policy as expressed in the
Securities Act and is therefore unenforceable.


                                     EXPERTS

         The financial  statements of the Company at December 31, 1995 and 1996,
and for the years then ended,  appearing in the  Company's  Annual  Report (Form
10-K) have been audited by Ernst & Young LLP, independent auditors,  and for the
year ended  December 31, 1994, by Richard A. Eisner & Company,  LLP  ("Eisner"),
independent  auditors, as set forth in their respective reports thereon included
therein,  and  incorporated  herein by reference  in reliance  upon such reports
given upon the  authority of such firms as experts in  accounting  and auditing.
The  Company  has  agreed  to  indemnify  Eisner  against  certain  liabilities,
including  liabilities  arising under the Securities  Act,  provided,  that such
indemnification  shall  not  be  effective  with  regard  to any  liability  for
professional malpractice or payment of settlement or judgement costs.


                                       20
<PAGE>



                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

         The estimated expenses payable by the Registrant in connection with the
issuance  and  distribution  of the  securities  being  registered  (other  than
underwriting discounts and commissions) are as follows:

                                                         Amount
                                                         ------
         SEC Registration Fee......................    $   501.00
         Accounting Fees and Expenses..............      5,000.00
         Legal Fees and Expenses...................     15,000.00
         Miscellaneous Expenses....................      4,499.00
                                                       ----------
              Total................................    $25,000.00
                                                       ==========



ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

         The Certificate of Incorporation and By-Laws of the Registrant  provide
that the Company shall indemnify any person to the full extent  permitted by the
Delaware General  Corporation Law (the "GCL").  Section 145 of the GCL, relating
to indemnification, is hereby incorporated herein by reference.

         In accordance  with Section  102(a)(7) of the GCL, the  Certificate  of
Incorporation of the Registrant  eliminates the personal  liability of directors
to the Company or its  stockholders for monetary damages for breach of fiduciary
duty as a  director  with  certain  limited  exceptions  set  forth  in  Section
102(a)(7).



ITEM 16.  EXHIBITS

3.1*           Restated  Certificate of Incorporation  (Fifth) of the Registrant
               (Filed  as  Exhibit  3.1 to the  Registrant's  Form  10-K for the
               fiscal year ended  December 31, 1993 and  incorporated  herein by
               reference).

3.2*           By-laws  of  the   Registrant   (Filed  as  Exhibit  3.2  to  the
               Registrant's  Form 10-K for the fiscal  year ended  December  31,
               1993 and incorporated herein by reference).

4.1*           Form of Common Stock certificate

5.1            Opinion of Bachner, Tally, Polevoy & Misher LLP


                                      II-1

<PAGE>



23.1           Consent of  Bachner,  Tally,  Polevoy & Misher LLP  (Included  in
               Exhibit 5.1)

23.2           Consent of Ernst & Young LLP, Independent Auditors

23.3           Consent of Richard A. Eisner & Co, LLP, Independent Auditors

24.1           Power of Attorney (Included on signature page)

- -------------
*        Incorporated by reference.


ITEM 17.  UNDERTAKINGS

         The undersigned registrant hereby undertakes:

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

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

          (ii) reflect in the prospectus any facts or events which, individually
               or together, represent a fundamental change in the information in
               the registration statement; and

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

         (2) That,  for the  purpose  of  determining  any  liability  under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

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

         The  undersigned  registrant  hereby  undertakes  that, for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
registrant's  annual report pursuant to Section 13(a) or 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.

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors,  officers and controlling  persons of
the  registrant  pursuant  to  the  foregoing  provisions,   or  otherwise,  the
registrant has been advised that in the opinion of the Commission

                                      II-2
<PAGE>



such  indemnification  is against  public policy as expressed in the Act and is,
therefore,  unenforceable. In the event that a claim for indemnification against
such liabilities  (other than the payment by the registrant of expenses incurred
or paid by a director,  officer or  controlling  person of the registrant in the
successful  defense of any  action,  suit or  proceeding)  is  asserted  by such
director,  officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.



                                      II-3
<PAGE>



                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
Registrant certifies that it has reasonable grounds to believe that it meets all
requirements  for filing on Form S-3 and has duly caused this  amendment  to its
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly authorized, in the City of Rockville,  State of Maryland on the 23rd day of
April, 1997.

                                      HUMAN GENOME SCIENCES, INC.,

                                      By:       /s/  William A. Haseltine, Ph.D.
                                               ---------------------------------
                                               William A. Haseltine, Ph.D.
                                               CHAIRMAN AND CHIEF EXECUTIVE
                                               OFFICER

                                POWER OF ATTORNEY

         KNOW  ALL MEN BY THESE  PRESENTS,  that  each  person  whose  signature
appears below under the heading "Signature"  constitutes and appoints William A.
Haseltine,  Ph.D. or Melvin D. Booth, his true and lawful  attorney-in-fact  and
agent with full power of  substitution  and  resubstitution,  for him and in his
name,  place and stead,  in any and all capacities to sign any or all amendments
to this registration statement,  and to file the same, with all exhibits thereto
and other  documents in connection  therewith,  with the Securities and Exchange
Commission,  granting unto said attorneys-in-fact and agents, each acting alone,
full  power  and  authority  to do and  perform  each and  every  act and  thing
requisite and  necessary to be done in and about the premises,  as fully for all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming all that said attorneys-in-fact and agents, each acting alone, or his
substitute or substitutes, may lawfully 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  by  the  following  persons  in  the
capacities and on the dates indicated.
<TABLE>
<CAPTION>
                     Signature                              Title                              Date
<S>                                               <C>                                     <C>

       /s/   William A. Haseltine, Ph.D.          Chairman of the Board                   April 23, 1997
  --------------------------------------------    and Chief Executive 
            William A. Haseltine, Ph.D.            Officer (principal 
                                                   executive officer) 
                                               

            /s/    Melvin D. Booth                President and Chief                     April 23, 1997
  --------------------------------------------     Operating Officer and 
                  Melvin D. Booth                  Director              
                                              



                                      II-4
<PAGE>



             /s/  Craig A. Rosen, Ph.D.           Senior Vice President                   April 23, 1997
   -------------------------------------------     -- Research and    
               Craig A. Rosen, Ph.D.               Development and    
                                                   Director           
                                              

              /s/ Bradley G. Lorimier             Senior Vice President                   April 23, 1997     
   -------------------------------------------     -- Business Development                                   
                Bradley G. Lorimier                and Director                                              
                                               


                  /s/   Steven Mayer              Senior Vice President                   April 23, 1997
  --------------------------------------------    and Chief Financial Officer  
                   Steven Mayer                   (principal financial and     
                                                  accounting officer)          
                                                  
             /s/ Robert A. Armitage               Director                                 ____________, 1997
  --------------------------------------------    
                Robert A. Armitage


  --------------------------------------------    Director                                 ____________, 1997
             James H. Cavanaugh, Ph.D.


            /s/  Beverly Sills Greenough          Director                                April 23, 1997
  -------------------------------------------
              Beverly Sills Greenough


               /s/   Donald D. Johnston           Director                                April 23, 1997
  -------------------------------------------
                Donald D. Johnston


                    /s/  Max Link                 Director                                April 23, 1997
  -------------------------------------------
                     Max Link


  -------------------------------------------     Director                                ____________, 1997
                    Joshua Ruch  



                  /s/   Robert Hormats            Director                                April 23, 1997
  -------------------------------------------
                  Robert Hormats


           /s/   James B. Wyngaarden, M.D.        Director                                April 23, 1997
  ------------------------------------------
             James B. Wyngaarden, M.D.

</TABLE>

                                      II-5




                                                                     Exhibit 5.1


                                 April 25, 1997



Human Genome Sciences, Inc.
9410 Key West Avenue
Rockville, Maryland  20850-3338

                     Re:  REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

         We have served as your counsel in connection  with the  preparation  of
your  Registration  Statement  on Form S-3 to be filed with the  Securities  and
Exchange  Commission under the Securities Act of 1933, as amended,  representing
the  offering and  issuance by a selling  stockholder  of an aggregate of 50,871
shares of the Common Stock,  $.01 par value (the "Common Stock") of Human Genome
Sciences, Inc. issuable on exercise of certain warrants.

         We have examined such corporate  records,  documents and matters of law
as we have considered appropriate for the purposes of this opinion.

         Based upon such examination and our participation in the preparation of
the Registration  Statement,  is it our opinion that the Common Stock, when sold
pursuant to the Registration  Statement,  will be validly issued, fully paid and
non-assessable.

         We  consent  to the  reference  made to our  firm  in the  Registration
Statement  and to the filing of this  opinion as an exhibit to the  Registration
Statement.

                                                Very truly yours,

                                                /s/ Bachner, Tally, Polevoy &
                                                Misher LLP

                                                BACHNER, TALLY, POLEVOY
                                                & MISHER LLP


                                                                    Exhibit 23.2

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

     We consent to the reference to our firm under the caption  "Experts" in the
Registration  Statement  (Form S-3 No.  333- ) and related  Prospectus  of Human
Genome  Sciences,  Inc. for the  registration  of 50, 871 shares of common stock
underlying  warrants and to the incorporation by reference therein of our report
dated  February 14,  1997,  with respect to the  financial  statements  of Human
Genome  Sciences,  Inc.  included in its Annual  Report (Form 10-K) for the year
ended December 31, 1996, filed with the Securities and Exchange Commission.



Vienna, Virginia
April 24, 1997                                           /s/ Ernst & Young LLP






                                                                    EXHIBIT 23.3


                        CONSENT OF INDEPENDENT AUDITORS

   We consent to the incorporation by reference in this  Registration  Statement
on Form S-3 of our report dated February 14, 1995 on the financial statements of
Human Genome  Sciences,  Inc. (the  "Company")  for the year ended  December 31,
1994,  included in the Company's  Annual Report on Form 10-K for the year  ended
December  31,  1996,  and to the  reference  to us under the  caption  "Experts"
included in the Prospectus.

                                        /s/ Richard A. Eisner & Company LLP


New York, New York
April 24, 1997


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