AMARILLO BIOSCIENCES INC
SB-2/A, 1996-07-02
PHARMACEUTICAL PREPARATIONS
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<PAGE>

   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 2, 1996 
                                                    REGISTRATION NO. 333-04413 

                      SECURITIES AND EXCHANGE COMMISSION 
                            Washington, D.C. 20549 
                                    ------ 
                               AMENDMENT NO. 1 
                                      TO 
                                  FORM SB-2 
                            REGISTRATION STATEMENT 
                                    Under 
                          THE SECURITIES ACT OF 1933 
                                    ------ 
                          AMARILLO BIOSCIENCES, INC. 
                (Name of Small Business Issuer in its Charter) 
<TABLE>

<S>                                               <C>                            <C>        
             Texas                                8731                           75-1974352 
(State or Other Jurisdiction of       (Primary Standard Industrial            (I.R.S. Employer 
 Incorporation or Organization)        Classification Code Number)            Identification No.) 
</TABLE>

                             800 West 9th Avenue 
                            Amarillo, Texas 79101 
                                (806) 376-1741 
(Address and Telephone Number of Principal Executive Offices and Principal 
                              Place of Business) 
                       Dr. Joseph M. Cummins, DVM, PhD 
                          Amarillo Biosciences, Inc. 
                             800 West 9th Avenue 
                            Amarillo, Texas 79101 
                                (806) 376-1741 
          (Name, Address and Telephone Number of Agent for Service) 
                                    ------ 
                                  Copies to: 
          ROBERT E. FISCHER, ESQ.                ROBERT J. MITTMAN, ESQ. 
 Lowenthal, Landau, Fischer & Bring, P.C.         Tenzer Greenblatt LLP 
              250 Park Avenue                     405 Lexington Avenue 
         New York, New York 10177               New York, New York 10174 
              (212) 986-1116                         (212) 885-5000 
       Facsimile No. (212) 986-0604           Facsimile No. (212) 885-5001 

   Approximate Date of Proposed Sale to the Public: As soon as practicable 
after this Registration Statement becomes effective. 

   If any of the securities being registered on this Form are to be offered 
on a delayed or continuous basis pursuant to Rule 415 under the Securities 
Act of 1933, check the following box. /X/ 

   If this Form is filed to register additional securities for an offering 
pursuant to Rule 462(b) under the Securities Act, please check the following 
box and list the Securities Act registration statement number of the earlier 
effective registration statement for the same offering. / /_____________ 

   If this Form is a post-effective amendment filed pursuant to Rule 462(c) 
under the Securities Act, check the following box and list the Securities Act 
registration statement number of the earlier effective registration statement 
for the same offering.  / /_____________ 

   If delivery of the prospectus is expected to be made pursuant to Rule 434, 
please check the following box.  / /
                                
                                     ------
   The Registrant hereby amends this Registration Statement on such date or 
dates as may be necessary to delay its effective date until the Registrant 
shall file a further amendment which specifically states that this 
Registration Statement shall thereafter become effective in accordance with 
Section 8(a) of the Securities Act of 1933 or until the Registration 
Statement shall become effective on such date as the Commission, acting 
pursuant to said Section 8(a), may determine. 
    


<PAGE>
                       CALCULATION OF REGISTRATION FEE 

<TABLE>
<CAPTION>
=================================================================================================== 
                                                           Proposed     Proposed 
                                                            Maximum      Maximum 
                                                           Offering     Aggregate     Amount of 
       Title of Each Class of            Amount to be      Price per    Offering     Registration 
    Securities to be Registered           Registered        Unit(1)     Price(1)         Fee 
- ---------------------------------------------------------------------------------------------------
<S>                                       <C>                   <C>         <C>           <C>
Shares of Common Stock, par value $.01 
  per share ...........................   2,300,000 shares (2)    $5.00     $11,500,000    $3,965.52 
Underwriter's Warrants to Purchase 
 Shares of Common Stock (3)  .........      200,000 warrants      $.001        $200           (4) 
Shares of Common Stock, par value 
 $.01 per share(5)  ..................        200,000 shares       $8.10     $1,620,000    $  558.62 
Total  .................................................................................   $4,524.14 
Less Amount Previously Paid  ...........................................................   $4,448.28 
Total Due  .............................................................................   $   75.86 
=====================================================================================================
</TABLE>
(1) Estimated solely for purposes of calculating the registration fee. 

(2) Includes 300,000 shares which the Underwriter has the option to purchase 
    from the Registrant solely to cover over-allotments. 

(3) Represents warrants to be issued by the Registrant and purchased by the 
    Underwriter at the time of delivery and acceptance of the shares of 
    Common Stock offered hereby. 

(4) None, pursuant to Rule 457(g). 

(5) Reserved for issuance upon exercise of the Underwriter's Warrants. 



                                      2 
<PAGE>

                          AMARILLO BIOSCIENCES, INC. 
                                    ------ 
                            CROSS REFERENCE SHEET 
                                    ------ 
   
<TABLE>
<CAPTION>
               Form SB-2 Item Nos. and Caption                                Prospectus Caption 
 -----------------------------------------------------------   ------------------------------------------------- 
<S>                                                           <C>
 1. Front of Registration Statement and Outside Front Cover 
     of Prospectus  ........................................  Outside Front Cover Page 
 2. Inside Front and Outside Back Cover Pages of 
    Prospectus  ............................................  Inside Front and Outside Back Cover Pages 
 3. Summary Information and Risk Factors  ..................  Prospectus Summary; Risk Factors 
 4. Use of Proceeds  .......................................  Use of Proceeds 
 5. Determination of Offering Price  .......................  Underwriting 
 6. Dilution  ..............................................  Dilution 
 7. Selling Security-Holders  ..............................  * 
 8. Plan of Distribution  ..................................  Outside Front Cover Page; Underwriting 
 9. Legal Proceedings  .....................................  * 
10. Directors, Executive Officers, Promoters and Control
     Persons ...............................................  Management
                                                              
11. Security Ownership of Certain Beneficial Owners and
     Management ............................................  Principal Shareholders                                  
                                                              Description of Common Stock; Shares Eligible For Future 
                                                              
12. Description of Securities  .............................  Sale 
13. Interest of Named Experts and Counsel  .................  Legal Matters; Experts 
14. Disclosure of Commission Position on Indemnification for 
    Securities Act Liabilities  ............................  * 
15. Organization Within Last Five Years  ...................  * 
16. Description of Business  ...............................  Prospectus Summary; Business 

17. Management's Discussion and Analysis or Plan of           
    Operation ..............................................  Management's Discussion and Analysis of Financial 
                                                              Condition and Results of Operations       
18. Description of Property  ...............................  Business 
19. Certain Relationships and Related Transactions  ........  Certain Transactions 
20. Market for Common Equity and Related Stockholder Matters 
                                                              * 
21. Executive Compensation  ................................  Management 
22. Financial Statements  ..................................  Consolidated Financial Statements 
23. Changes in and Disagreements with Accountants on 
     Accounting and Financial Disclosure  ..................  * 
    
</TABLE>

- ------ 
* Not applicable. 

<PAGE>

Information contained herein is subject to completion or amendment. A 
registration statement relating to these securities has been filed with the 
Securities and Exchange Commission. These securities may not be sold nor may 
offers to buy be accepted prior to the time the registration statement 
becomes effective. This prospectus shall not constitute an offer to sell or 
the solicitation of an offer to buy nor shall there be any sale of these 
securities in any state in which such offer, solicitation or sale would be 
unlawful prior to registration or qualification under the securities laws of 
any such state. 
   
                  PRELIMINARY PROSPECTUS DATED JULY 2, 1996 
                            SUBJECT TO COMPLETION 
    
[LOGO] 
                               2,000,000 SHARES 
                          AMARILLO BIOSCIENCES, INC. 
                                 COMMON STOCK 

   Prior to this offering, there has been no public market for the Common 
Stock and there can be no assurance that any such market will develop. It is 
anticipated that the Common Stock will be quoted on the NASDAQ Small Cap 
Market ("NASDAQ") under the symbol "AMAR." For a discussion of the factors 
considered in determining the initial public offering price, see 
"Underwriting." 
   
   Of the shares of Common Stock being sold in this offering, 600,000 shares 
have been reserved for sale, at the initial offering price, to Hayashibara 
Biochemical Laboratories, Inc. ("HBL"), a principal shareholder and supplier 
of the Company, or its designees. In addition, the Company has agreed to use 
$1,000,000 of the proceeds of this offering to pay a portion of the 
indebtedness owed by the Company to HBL. See "Use of Proceeds," "Principal 
Shareholders" and "Certain Transactions." 
                                    ------ 
THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK AND IMMEDIATE 
  SUBSTANTIAL DILUTION AND SHOULD NOT BE PURCHASED BY INVESTORS WHO CANNOT 
    AFFORD THE LOSS OF THEIR ENTIRE INVESTMENT. SEE "RISK FACTORS" 
               COMMENCING ON PAGE 6 AND "DILUTION" ON PAGE 17. 
    
                                    ------ 
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. 
===============================================================================
                                         Price       Underwriting    Proceeds 
                                          to        Discounts and      to 
                                        Public      Commissions(1)  Company(2) 
- -------------------------------------------------------------------------------
Per Share  ..........................    $5.00          $.50          $4.50 
- -------------------------------------------------------------------------------
Total(3)  ........................... $10,000,000    $1,000,000    $9,000,000 
===============================================================================
(1) In addition, the Company has agreed to pay to the Underwriter a 3% 
    nonaccountable expense allowance, to sell to the Underwriter warrants 
    (the "Underwriter's Warrants") to purchase up to 200,000 shares of Common 
    Stock and to retain the Underwriter as a financial consultant. The 
    Company has agreed to indemnify the Underwriter against certain 
    liabilities, including liabilities under the Securities Act of 1933, as 
    amended. See "Underwriting." 
(2) Before deducting expenses, including the nonaccountable expense allowance 
    in the amount of $300,000 ($345,000 if the Underwriter's over-allotment 
    option is exercised in full), estimated at $825,000, payable by the 
    Company. 
(3) The Company has granted the Underwriter an option, exercisable within 45 
    days from the date of this Prospectus, to purchase up to 300,000 
    additional shares of Common Stock, on the same terms as set forth above, 
    solely for the purpose of covering over-allotments, if any. If the 
    Underwriter's over-allotment option is exercised in full, the total price 
    to public, underwriting discounts and commissions and proceeds to Company 
    will be $11,500,000, $1,150,000 and $10,350,000 respectively. See 
    "Underwriting." 

   The shares of Common Stock are being offered, subject to prior sale, when, 
as and if delivered to and accepted by the Underwriter and subject to 
approval of certain legal matters by counsel and to certain other conditions. 
The Underwriter reserves the right to withdraw, cancel or modify the offering 
and to reject any order in whole or in part. It is expected that delivery of 
certificates representing the shares of Common Stock offered hereby will be 
made at the offices of the Underwriter, 650 Fifth Avenue, New York, New York 
10019, on or about         , 1996. 
                                    ------ 
   
                          WHALE SECURITIES CO., L.P. 
                The date of this Prospectus is         , 1996 
    
                                      
<PAGE>

   
   A graphic image of a man appears here showing the path of IFN|ga taken 
orally. Four circles surrounding the image display drawings of (i) a profile 
of the head of a person suffering from Sjogren's syndrome, (ii) the mouth of 
an individual with oral mucositis, (iii) an IFN|ga molecule and (iv) a 
microscopic view of a portion of a liver infected with the hepatitis virus. 
In addition to the graphic images, the following text appears: "The Company 
is currently focusing its research on human health indications for the use of 
low dose oral natural interferon alpha ("IFN|ga"). Based upon initial results, 
the Company intends to focus its development activities on the applications 
discussed below: Sjogren's Syndrome. Sjogren's syndrome is a chronic 
autoimmune disorder characterized by severe dryness of the eyes and mouth. 
The Company believes oral IFN|ga therapy helps to relieve the dryness 
associated with Sjogren's syndrome and may effectively supplement or be used 
in lieu of existing treatments. Oral Mucositis. Oral mucositis is a condition 
characterized by inflammation and sometimes ulcerations of the mucosal lining 
of the mouth. It is often associated with the use of chemotherapy or 
radiation therapy on cancer patients. The Company has filed and there is now 
in effect an Investigational New Drug Application for the use of IFN|ga to 
treat oral mucositis. Hepatitis B and Hepatitis C. Hepatitis is a family of 
diseases in which inflammation of the liver occurs. Hepatitis B and hepatitis 
C are two of the most common viruses which cause hepatitis. The Company 
believes that low dose oral IFN|ga therapy for chronic active hepatitis B 
disease might be as beneficial a treatment for the disease as parenteral IFN|ga 
and will be more economical. The Company believes that, by pretreating 
hepatitis C patients with low dose oral IFN|ga, the response rate of those 
patients to parenteral IFN|ga treatment may increase." 
    

                            AVAILABLE INFORMATION 

   
   As of the date of this Prospectus, the Company will become subject to the 
reporting requirements of the Securities Exchange Act of 1934, as amended 
(the "Exchange Act"), and, in accordance therewith, will file reports, proxy 
statements and other information with the Securities and Exchange Commission 
(the "Commission"). The Company intends to furnish its shareholders with 
annual reports containing audited financial statements and such other reports 
as the Company deems appropriate or as may be required by law. 

   IN CONNECTION WITH THIS OFFERING, THE UNDERWRITER MAY OVER-ALLOT OR EFFECT 
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK 
AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN MARKET. SUCH 
STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME. 
    

                                      2 
<PAGE>

                              PROSPECTUS SUMMARY 

   
   The following summary is qualified in its entirety by the more detailed 
information and consolidated financial statements, including the notes 
thereto, appearing elsewhere in this Prospectus. Each prospective investor is 
urged to read this Prospectus in its entirety. Unless otherwise indicated, 
all share and per share information in this Prospectus (i) gives retroactive 
effect to a 10-for-1 stock split effected in May 1993 and a 20% stock 
dividend effected in May 1996, and (ii) assumes that the Underwriter's 
over-allotment option is not exercised. See "Underwriting" and Notes 1 and 13 
of Notes to Consolidated Financial Statements. For definitions of certain 
terms used in this Prospectus see the Glossary beginning on page 46. 
    

                                 THE COMPANY 

   Amarillo Biosciences, Inc., a development-stage company (the "Company"), 
is engaged in developing biologics for the treatment of human and animal 
diseases. The Company is currently focusing its research on human health 
indications for the use of low dose oral natural interferon alpha ("IFN|ga"), 
particularly for the treatment of Sjogren's syndrome, oral mucositis in 
cancer patients and hepatitis B and C ("Primary Development Projects"). The 
Company believes that significant worldwide opportunities exist for the 
development of low dose oral natural IFN|ga as an inexpensive, non-toxic, 
efficacious alternative to the treatment of disease by injection of high 
doses of IFN|ga. In addition, the Company believes that low dose oral natural 
IFN|ga can be an effective treatment for diseases or conditions for which 
current therapies are inadequate. 

   
   The Company owns or licenses eleven United States patents relating to low 
dose oral natural IFN|ga. Since 1992, the Company has filed, and there now are 
in effect, seven Investigational New Drug Applications covering indicated 
uses for low dose oral IFN|ga, including treatment of Sjogren's syndrome and 
oral mucositis. The Company is seeking regulatory approvals in certain 
foreign countries to test and/or market low dose oral IFN|ga for the treatment 
of hepatitis B and C. 

   The Company is also testing oral IFN|ga in cats with herpesvirus-1 
infection, dogs with keratoconjunctivitis sicca and cattle with shipping 
fever or mastitis and has filed, and there are now in effect, Investigational 
New Animal Drug Notices for these and other indications for the product in 
animals. The Company is also testing a topical IFN|ga as a treatment for 
genital warts in humans. 
    

   The Company has formed a strategic alliance with Hayashibara Biochemical 
Laboratories, Inc. ("HBL") of Okayama, Japan, a subsidiary of Hayashibara 
Company, Ltd., a privately-owned Japanese holding corporation with 
diversified subsidiaries. To date, the Company has received from HBL research 
funding in the amount of $9,000,000. HBL has also purchased from the Company 
an aggregate of 461,520 shares of Common Stock for a total purchase price of 
$1,443,800 and has made loans to the Company aggregating $3,000,000, of which 
$1,000,000 borrowed after March 31, 1996 will be repaid simultaneously with 
the consummation of this offering. Pursuant to a Joint Development and 
Manufacturing/Supply Agreement between HBL and the Company (the "Development 
Agreement"), HBL manufactures and supplies exclusively to the Company IFN|ga 
for oral use in the development of human applications under the Company's 
patents for worldwide markets outside of Japan and for animal applications 
worldwide. The Company also has a non-exclusive license from HBL to use HBL's 
patented technology to produce IFN|ga lozenges with anhydrous maltose. This 
formulation significantly prolongs the stability of IFN|ga activity at room 
temperature. In addition, HBL has agreed to supply its IFN|ga exclusively to 
the Company in North America for non-oral (topical and parenteral) use. 

   The Company has also entered into manufacturing and supply and license 
agreements with Interferon Sciences, Inc. ("ISI") of New Brunswick, New 
Jersey, a subsidiary of National Patent Development, Inc., under which ISI, 
among other things, supplies exclusively to the Company, IFN|ga for oral use in 
animals. 

   The Company's objective is to exploit its proprietary technology to become 
a leader in the field of low dose oral IFN|ga applications. The Company's 
business strategy is to pursue those indications for low dose oral IFN|ga 
treatment for which initial clinical research has indicated the treatment is 
efficacious and 

                                      3 
<PAGE>

   
which in the opinion of the Company have the greatest commercial potential 
and are most likely to be approved by the United States Food and Drug 
Administration (the "FDA"). To the extent possible, the Company will attempt 
to minimize the cost to the Company of obtaining FDA approval by utilizing 
forms of IFN|ga already approved (in other dosage forms and for different 
indications) by the Japanese Ministry of Health and Welfare for human use or 
by the FDA for animal use. The Company believes that such minimized costs 
will be the result of more information available for use in preparing 
applications for approval. The Company will attempt to gain market share for 
approved products by forming alliances with strong marketing partners. 
    

   The Company is in the development stage and currently has no products 
approved for commercial use other than in Kenya. The Company's long-term 
viability, profitability and growth will depend upon successful 
commercialization of products resulting from its research and product 
development activities. To date, although the Company has recorded contract 
revenue relating to research and development pursuant to the Development 
Agreement, the Company has generated only limited revenues from product sales 
and licensing. Moreover, the Company has incurred significant losses, 
including losses of $129,239 and $311,579 for the years ended December 31, 
1994 and 1995, respectively, and $4,943,168 for the period from June 25, 1984 
(inception) through March 31, 1996. For the years ended December 31, 1994 and 
1995 and the three months ended March 31, 1996, the Company recorded contract 
revenues of $2,480,093, $1,361,395 and $402,574, respectively, as research 
and development and administrative costs were incurred. As of March 31, 1996, 
all but $14,566 of the $9,000,000 in research funding provided by HBL from 
1992 to 1994 pursuant to the Development Agreement had been recognized as 
contract revenue. HBL has no obligation to provide additional research 
funding to the Company nor does the Company currently have such a commitment 
from any other person. Inasmuch as the Company will continue to have a high 
level of research and development and general and administrative expenses 
(including compensation expense in 1996 of $515,156 relating to the issuance 
of restricted stock to three officers of the Company simultaneously with the 
sale of the Common Stock offered hereby) and will not have matching contract 
revenues as such expenditures are incurred, the Company anticipates that, 
commencing in the second quarter of 1996, losses will increase significantly 
and losses will continue until such time, if ever, as the Company is able to 
generate sufficient revenues to support its operations. The Company believes 
that its ability to generate sufficient revenues primarily depends on the 
success of the Company in completing development and obtaining regulatory 
approvals for the commercial sale of products, including approval of any 
manufacturing facilities established or maintained by the Company or its 
suppliers that produce such products. There can be no assurance that any of 
such events will occur, that the Company will attain revenues from 
commercialization of its products or that the Company will ever achieve 
profitable operations. See "Risk Factors." 

   The Company was incorporated in June 1984 in the State of Texas under the 
name of Amarillo Cell Culture Company, Incorporated. In May 1996, the Company 
changed its name to Amarillo Biosciences, Inc. The executive offices of the 
Company are located at 800 West 9th Avenue, Amarillo, Texas 79101 and its 
telephone number is (806) 376-1741. Unless the context otherwise requires, 
all references in this Prospectus to the Company include its wholly-owned 
subsidiaries, Vanguard Biosciences Inc., Veldona USA Inc., Veldona Inc., 
Veldona Africa Inc., Veldona Poland Inc. and Amarillo Cell of Canada Inc. 

                                 THE OFFERING 

Common Stock offered...........  2,000,000 shares 

Common Stock to be outstanding 
  after the offering (1).......  5,114,232 shares 

Use of Proceeds................  The Company intends to use approximately 
                                 $6,350,000 of the net proceeds of this 
                                 offering for research and development, 
                                 $1,000,000 for repayment of certain 
                                 short-term indebtedness to HBL and the 
                                 balance for working capital and general 
                                 corporate purposes. See "Use of Proceeds." 

                                      4 
<PAGE>

Risk Factors...................  The securities offered hereby are 
                                 speculative and involve a high degree of 
                                 risk and immediate substantial dilution and 
                                 should not be purchased by investors who 
                                 cannot afford the loss of their entire 
                                 investment. See "Risk Factors" and 
                                 "Dilution." 

Proposed NASDAQ symbol.........  AMAR 
   
- ------ 
(1) Includes 79,000 shares of Common Stock to be issued to three officers of 
    the Company simultaneously with the sale of the Common Stock offered 
    hereby pursuant to their employment agreements. Does not include (i) 
    200,000 shares of Common Stock reserved for issuance upon exercise of the 
    Underwriter's Warrants; (ii) an aggregate of 115,500 shares of Common 
    Stock reserved for issuance upon the exercise of stock options to be 
    outstanding under the Company's 1996 Employee Stock Option Plan and the 
    Company's Outside Director and Advisor Stock Option Plan (collectively, 
    the "Plans"), none of which options are currently exercisable; or (iii) 
    an aggregate of 134,500 shares of Common Stock reserved for issuance upon 
    exercise of stock options which are available for future grant under the 
    Plans. See "Management -- Employment Agreements," "-- Stock Option 
    Plans," "Principal Shareholders," "Certain Transactions" and 
    "Underwriting." 
    
                  SUMMARY CONSOLIDATED FINANCIAL INFORMATION 

   The summary consolidated financial information set forth below is derived 
from the consolidated financial statements appearing elsewhere in this 
Prospectus. Such information should be read in conjunction with such 
financial statements, including the notes thereto. 

CONSOLIDATED STATEMENT OF OPERATIONS DATA: 

<TABLE>
<CAPTION>
   
                                                                                      Cumulative From 
                                                                                       June 25, 1984 
                                                                                        (Inception) 
                                                          Three Months Ended March        Through 
                             Year Ended December 31,                31,                  March 31, 
                          ----------------------------   --------------------------   --------------- 
                               1994           1995           1995          1996            1996 
                           ------------   ------------    -----------   -----------   --------------- 
<S>                       <C>             <C>             <C>           <C>           <C>
Total revenues  ........    $2,653,331     $2,006,262     $  647,069    $  415,728      $10,570,886 
Total expenses  ........     2,782,570      2,317,841        722,003       402,921       15,514,054 
Net income (loss)  .....      (129,239)      (311,579)       (74,934)       12,807       (4,943,168) 
Net loss per share  ....          (.04)          (.10)          (.02)           -- 
Weighted average shares 
  outstanding ..........     3,005,592      3,034,339      3,031,609     3,035,232 

</TABLE>

CONSOLIDATED BALANCE SHEET DATA: 

<TABLE>
<CAPTION>
                                                                                 March 31, 1996 
                                                                        ------------------------------- 
                                                     December 31, 1995      Actual       As Adjusted(1) 
                                                     -----------------   -------------    -------------- 
<S>                                                  <C>                <C>              <C>
Cash and cash equivalents  .......................      $ 1,108,527       $   724,280      $ 8,664,280 
Working capital (deficiency)  ....................          (18,035)           (2,585)       8,062,102 
Total assets  ....................................        1,791,060         1,424,004        9,364,004 
Total liabilities  ...............................        3,152,957         2,743,094        2,618,407 
Deficit accumulated during the development stage .       (4,955,975)       (4,943,168)      (5,448,481) 
Shareholders' equity (deficit)  ..................       (1,361,897)       (1,319,090)       6,745,597 
</TABLE>
- ------ 
(1) Gives effect to the sale of 2,000,000 shares of Common Stock offered 
    hereby and the anticipated application of the estimated net proceeds 
    therefrom, including the payment of $235,000 to satisfy withholding tax 
    obligations of the Company arising in a transaction required under the 
    employment agreements of three officers in which the Company shall also 
    issue 79,000 shares of Common Stock to such officers. Subsequent to March 
    31, 1996, the Company borrowed $1,000,000 from HBL, which amount will be 
    repaid from the proceeds of this offering. See "Use of Proceeds" and 
    "Certain Transactions." 
    

                                      5 
<PAGE>

                                 RISK FACTORS 

   The shares of Common Stock offered hereby are speculative and involve a 
high degree of risk, including, but not necessarily limited to, the risk 
factors described below. Each prospective investor should carefully consider 
the following risk factors inherent in and affecting the business of the 
Company and this offering before making an investment decision. 

   Except for the historical information contained herein, the discussion in 
this Prospectus contains forward- looking statements that involve risks and 
uncertainties. The Company's actual results could differ materially from 
those discussed here. Factors that could cause or contribute to such 
difference include, but are not limited to, those discussed in "Risk 
Factors," "Management's Discussion and Analysis of Financial Condition and 
Results of Operations" and "Business" as well as those discussed elsewhere in 
this Prospectus. 

   Development Stage Company; Uncertainty of Product Development; Limited 
Relevant Operating History. The Company is in the development stage and 
currently has no products approved for commercial use other than in Kenya. 
The Company's long-term viability, profitability and growth will depend upon 
successful commercialization of products resulting from its research and 
product development activities. The Company will not be able to sell 
significant quantities of any product until such time, if ever, as it 
receives regulatory approval to commercially market the product. All of the 
Company's products will require significant additional development, 
laboratory and clinical testing and investment prior to obtaining such 
approvals for any product and prior to commercialization. The Company does 
not expect to receive regulatory approvals in the United States for any 
product for at least three years. Moreover, adverse or inconclusive results 
in clinical trials could significantly delay or ultimately preclude any such 
approvals and, even if obtained, there can be no assurance that any product 
approval will lead to the successful commercialization of such product. 
Further, as a development stage company, the Company has a limited relevant 
operating history upon which an evaluation of its prospects can be made. Such 
prospects must be considered in light of the risks, expenses and difficulties 
frequently encountered in establishing a new business in the evolving, 
heavily regulated pharmaceutical industry, which is characterized by an 
increasing number of market entrants, intense competition and a high failure 
rate. In addition, significant challenges are often encountered in shifting 
from development to commercialization of new products. See "Business." 

   
   History of Significant Losses; Anticipated Future Losses; Limited Product 
Revenues. To date, although the Company has recorded contract revenues 
relating to research and development pursuant to the Development Agreement, 
the Company has generated only limited revenues from product sales and 
licensing. Moreover, the Company has incurred significant losses, including 
losses of $129,239 and $311,579 for the years ended December 31, 1994 and 
1995, respectively, and $4,943,168 for the period from June 25, 1984 
(inception) through March 31, 1996. For the years ended December 31, 1994 and 
1995 and the three months ended March 31, 1996, the Company recorded contract 
revenues of $2,480,093, $1,361,395 and $402,574, respectively, as research 
and development and administrative costs were incurred. As of March 31, 1996, 
all but $14,566 of the $9,000,000 in research funding provided by HBL from 
1992 to 1994 pursuant to the Development Agreement had been recognized as 
contract revenue. HBL has no obligation to provide additional research 
funding to the Company nor does the Company currently have such a commitment 
from any other person. Inasmuch as the Company will continue to have a high 
level of research and development and general and administrative expenses 
(including compensation expense in 1996 of $515,156 relating to the issuance 
of restricted stock to three officers of the Company simultaneously with the 
sale of the Common Stock offered hereby) and will not have matching contract 
revenues as such expenditures are incurred, the Company anticipates that, 
commencing in the second quarter of 1996, losses will increase significantly 
and losses will continue until such time, if ever, as the Company is able to 
generate sufficient revenues to support its operations. The Company believes 
that its ability to generate sufficient revenues primarily depends on the 
success of the Company in completing development and obtaining regulatory 
approvals for the commercial sale of products, including approval of any 
manufacturing facilities established or maintained by the Company or its 
suppliers that produce such products. There can be no assurance that any of 
such events will occur, that the Company will attain revenues from 
commercialization of its products or that the Company will ever achieve 
profitable operations. See "Management's Discussion and Analysis of Financial 
Condition and Results of Operations," "Business" and Consolidated Financial 
Statements. 
    

   Significant Capital Requirements; Dependence on Proceeds of this Offering; 
Need for Additional Capital. The Company's capital requirements have been and 
will continue to be significant. To fund its capital 

                                      6 
<PAGE>

   
requirements to date, the Company has been dependent primarily on (i) an 
aggregate of $9,000,000 in funding received from HBL under the Development 
Agreement, (ii) the net cash proceeds of private placements of the Company's 
Common Stock, aggregating approximately $3,500,000 and (iii) loans from HBL 
aggregating $3,000,000, of which $1,000,000 borrowed after March 31, 1996 
will be repaid with a portion of the proceeds of this offering. The Company 
is dependent upon the proceeds of this offering to fund its research and 
development as well as other working capital requirements. The Company 
anticipates, based on its currently proposed plans and assumptions relating 
to its operations (including assumptions regarding the progress of its 
research and development and the timing and costs associated with the Primary 
Development Projects), that the net proceeds of this offering, together with 
the Company's existing capital resources, will be sufficient to satisfy the 
Company's estimated cash requirements for at least 12 months following the 
consummation of this offering. The Company estimates that an aggregate of 
$11,100,000 will be needed over approximately the next three years to 
complete its Primary Development Projects. Such amount is in excess of the 
net proceeds of this offering and the existing capital of the Company. 
Therefore, unless the Company generates significant revenues during such 
period, which the Company believes is unlikely, the Company will need 
additional financing to fully fund such development. The Company has no 
current arrangements with respect to, or sources of, additional financing and 
it is not anticipated that any of the officers, directors or shareholders of 
the Company (including HBL) will provide any portion of the Company's future 
financing requirements. There can be no assurance that, when needed, 
additional financing will be available to the Company on commercially 
reasonable terms, or at all. In the event that the Company's plans change, 
its assumptions change or prove inaccurate, or if the net proceeds of this 
offering, together with other capital resources, otherwise prove to be 
insufficient to fund operations, the Company could be required to seek 
additional financing sooner than currently anticipated. Any inability to 
obtain additional financing when needed would have a material adverse effect 
on the Company, including possibly requiring the Company to significantly 
curtail or possibly cease its operations. In addition, any additional equity 
financing may involve substantial dilution to the Company's then existing 
shareholders. See "Use of Proceeds," "Dilution," "Management's Discussion and 
Analysis of Financial Condition and Results of Operations," "Business" and 
"Certain Transactions." 
    

   Patent Claims Made By Roche. Hoffmann La-Roche, Inc. ("Roche") has 
asserted to both HBL and ISI that the manufacture, sale and use of their 
respective forms of IFN|ga infringe United States Patent 4,503,035 and foreign 
counterparts thereof owned by Roche relating to IFN|ga (collectively, the 
"Roche Patent"). The Roche Patent expires in March 2002 in the United States 
and at various times in other jurisdictions. HBL has informed the Company 
that it believes that the claims of the Roche Patent are not applicable to 
the manufacture and sale of HBL IFN|ga . HBL has prevailed at the trial level 
in litigation initiated by Roche in Japan concerning the dispute and Roche 
has appealed the decision. The Company is not a party to the litigation 
between Roche and HBL in Japan. 

   
   The Company believes that it is likely that Roche would commence suit 
against the Company if the Company were to sell or attempt to sell HBL IFN|ga 
for commercial use in the United States or any other country where the Roche 
Patent has issued with IFN|ga composition claims and is still in effect. 
However, under applicable United States patent law, the use of a patented 
product solely for uses reasonably related to the development and submission 
of information for seeking FDA approval of a biologic for indicated uses in 
humans is not an act of infringement. Thus, the Company believes that it is 
unlikely that it would be sued by Roche prior to commercialization of the 
Company's IFN|ga products. Roche would also not assert infringement claims with 
respect to the Company's sale of ISI IFN|ga , because in March 1995 ISI entered 
into a license agreement with Roche pursuant to which ISI was granted a 
license to use the Roche Patent in exchange for specified royalties. 

   The Company believes that its oral IFN|ga dosage forms do not infringe any 
claims of the Roche Patent. However, there can be no assurance that, if the 
Company sells or attempts to sell HBL IFN|ga for commercial use in one or more 
countries in which the Roche Patent has issued, such sale or attempted sale 
would not be determined to be an infringement of the Roche Patent under 
applicable law. HBL has agreed to indemnify the Company for litigation 
expenses incurred in defending suits brought by Roche against the Company for 
infringement of the Roche Patent and for any damages the Company may be 
required to pay to Roche in the event that Roche is successful in any such 
suit. Nevertheless, a determination of infringement could have a material 
adverse effect on the business and operations of the Company. See 
"Business-Patents and Proprietary Rights" and Certain Transactions." 
    

                                      7 
<PAGE>

   Government Regulation. The development, manufacture, testing and marketing 
of all of the Company's products are subject to extensive regulation by 
numerous authorities in the United States and other countries. In the United 
States, before new pharmaceutical products (including biologics) are 
permitted to be marketed commercially, they must undergo extensive 
preclinical and clinical testing to satisfy the FDA that they are safe and 
efficacious in each clinical indication (the specific condition intended to 
be treated) for which approval is sought. Additionally, approval by analogous 
regulatory authorities in other countries must be obtained prior to 
commencing marketing of pharmaceutical products in those countries. The 
approval process varies from country to country and approval of a drug for 
sale in one country does not ensure approval in other countries. Delays in 
obtaining regulatory approvals may adversely affect the development, testing 
or marketing of the Company's products and the ability of the Company to 
generate revenues from the sale or licensing of such products. There can be 
no assurance that the Company will obtain regulatory approvals for its 
products in a timely manner, or at all. 

   Since 1992 the Company has filed and there are now in effect, seven INDs 
covering indicated uses for low dose oral IFN|ga. The Company intends to use a 
portion of the proceeds of this offering to do clinical testing of the use of 
low dose oral IFN|ga in treating Sjogren's syndrome and oral mucositis, two of 
the indications covered by the INDs granted to the Company. There can be no 
assurance that regulatory approvals will be obtained by the Company in the 
United States or any other country to sell IFN|ga for such purposes. In 
addition, INADs have been filed and are now in effect for testing of low dose 
oral IFN|ga in cats, dogs, swine, horses and cattle. 

   Manufacturers of therapeutic products sold in the United States are 
required to satisfy the FDA that their manufacturing facilities and processes 
adhere to the agency's good manufacturing practices ("GMP") regulations and 
to engage in extensive record keeping and reporting. Even if regulatory 
approval for a product is granted, the facilities in which the product is 
manufactured will be subject to periodic review and inspections by the FDA or 
the analogous regulatory authorities of other countries for compliance with 
GMP or similar foreign regulatory standards. Compliance with such regulations 
requires substantial time and attention, and is costly. In addition, each 
domestic manufacturing establishment must be registered with and approved by 
the FDA. For biologics, except certain well-characterized ones, this requires 
the filing of an establishment license application for the facilities at 
which the product will be produced. Failure to comply with the applicable 
regulatory requirements by either the Company or its strategic partners 
could, among other things, result in criminal prosecution and fines, product 
recalls, product seizures and operating restrictions. 

   The Company has not yet sought FDA approval for the commercial sale of any 
of its products or for the manufacturing processes or facilities of any of 
its strategic partners. The Company has obtained approval in Kenya for the 
use of oral IFN|ga for the treatment of certain symptoms of AIDS and has made 
application in Poland for the use of oral IFN|ga as a treatment for hepatitis B 
and AIDS, but has not yet received approval for commercial sales in Poland. 
The approval process applicable to products of the type being developed by 
the Company usually takes many years and typically requires substantial 
expenditures. Moreover, even if approval is granted, such approval may impose 
limitations on the indicated uses for which a product may be marketed. 

   Inasmuch as the Company may manufacture products in the United States and 
seek to market or license other domestic manufacturers to market products 
throughout the world, the Company may become subject to United States laws 
and regulations applicable to exporting drugs, including biologics. The 
Federal Food, Drug, and Cosmetic Act stipulates that, prior to FDA approval 
for commercial sale, a drug manufactured in the United States may be 
exported, without prior FDA authorization, only to certain countries listed 
in Section 802 of that act. This list contains 25 countries to which such a 
drug may be exported, provided certain requirements are met, including that: 
(i) at least one of the 25 countries has granted approval for such drug for 
commercial sale, (ii) the product is manufactured in substantial compliance 
with the FDA's GMP regulations, (iii) the FDA is notified of the exportation, 
and (iv) the FDA has not determined that the probability of reimportation 
presents an imminent hazard to the public health and safety of the United 
States. Drugs for investigational use in any of the 25 countries may be 
exported without notification to the FDA. Thus, the ability of the Company or 
its licensees to export products manufactured in the United States prior to 
receiving commercial approval in the United States will be subject to certain 
restrictions. Therefore, there can be no assurance that the Company or its 
licensees would be able to export for investigational use or commercial sale 
in any countries products manufactured in the United States which have not 
received FDA approval. 

                                      8 
<PAGE>

   The Company is also subject to the regulations of the United States 
Environmental Protection Agency as well as other federal, state and local 
laws and regulations governing the use and disposal of hazardous materials. 
Compliance with these laws and regulations is time-consuming and expensive 
and failure to comply could have a material adverse effect on the Company. 

   The adoption by federal, state or local governments of significant new 
laws or regulations or a change in the interpretation of existing laws or 
regulations relating to environmental or other regulatory matters could 
increase the cost of producing the products manufactured by the Company or 
its strategic partners or otherwise adversely affect the demand for the 
Company's products. Adverse governmental regulation which might arise from 
future legislative or administrative action cannot be predicted. See 
"Business-Government Regulation." 

   
   Dependence on HBL; Possible Conflict of Interest. The success of the 
Company's business will depend upon many factors beyond the Company's 
control, including its contractual and working relationship with HBL. The 
Company relies and will rely on HBL to supply HBL IFN|ga to the Company in 
sufficient quantities to support development and regulatory approval of 
products for oral and topical use in humans and animals. The ability of the 
Company to commercialize its oral IFN|ga products in Japan will be dependent 
upon the efforts of HBL, to which it has granted exclusive marketing rights 
in such country. To date HBL has provided to the Company an aggregate of 
$9,000,000 of funding pursuant to the Development Agreement. HBL has also 
purchased from the Company an aggregate of 461,520 shares of Common Stock for 
a total purchase price of $1,443,800 and has made loans to the Company 
aggregating $3,000,000. Of such loans, $1,000,000 principal amount bearing 
interest at 6% per annum is due in September 1996 and $1,000,000 principal 
amount bearing interest at 6% per annum is due in September 1997, provided in 
each case that principal and accrued interest thereon are required to be paid 
only out of 10% of the Company's gross revenues from its sale of IFN. The 
remaining $1,000,000 principal amount of the loans bears interest at the rate 
of 4% per annum and is required to be, and will be, repaid with a portion of 
the proceeds of this offering. Of the shares of Common Stock to be sold in 
this offering, 600,000 shares have been reserved for sale to HBL or its 
designees. Giving effect to the sale of 2,000,000 shares of the Company's 
Common Stock pursuant to this offering, including 600,000 shares to HBL, and 
the issuance of 79,000 shares to three officers of the Company simultaneously 
with the sale of the Common Stock offered hereby, HBL will own approximately 
31.9% of the Company's Common Stock. Despite its substantial investment in 
the Company, HBL is not obligated to provide any additional funding to the 
Company. The initial term of the Development Agreement expires in March 1999, 
but the agreement is automatically renewable for successive three year terms, 
subject to the prior written agreement of the parties. Commencing in March 
2002, HBL may also terminate the Development Agreement if sales by the 
Company or its sublicensees of oral products containing HBL IFN|ga shall not 
have exceeded $100,000 during the calendar year prior to the termination. If 
such agreement is terminated, the Company would lose its only current source 
of supply of IFN|ga for use in humans and there can be no assurance that 
alternate sources of supply would be available on satisfactory terms, or at 
all. Such loss could severely limit the Company's ability to conduct clinical 
trials for the development of applications for its products or to sell its 
products. The termination of the Company's relationship with HBL could also 
adversely affect the Company's ability to develop and maintain business 
relationships with other companies. HBL is a principal shareholder of the 
Company and one of the directors of the Company is an employee of HBL. The 
Development Agreement and other agreements and arrangements with HBL may from 
time to time require further negotiation with the Company and there can be no 
assurance that conflicts of interest will not arise with respect to the 
foregoing agreements or arrangements or that conflicts will be resolved in a 
manner favorable to the Company. See "Business -- Strategic Alliance with 
HBL" and "Certain Transactions." 
    

   Limited Manufacturing Capability and Experience. To be successfully 
commercialized, the Company's products must be manufactured in large 
quantities in compliance with regulatory requirements and at an acceptable 
cost. The Company does not intend to build manufacturing facilities for such 
purpose. Rather, it currently intends to obtain all of its requirements of 
bulk IFN|ga for oral use in humans from HBL and all of its requirements of bulk 
IFN|ga for animal use from either ISI or HBL. HBL manufactures IFN|ga at its 
plant in Okayama, Japan, which the Company believes will have sufficient 
capacity to produce all of the Company's requirements of the product for the 
foreseeable future. HBL will be required to obtain FDA approval for 
commercial-scale manufacturing of products sold in the United States which 
contain HBL IFN|ga , which approval has not yet been sought or obtained. ISI 
manufactures IFN|ga at its plant in New Brunswick, New Jersey. The FDA has 
approved an establishment license application for such facility. The Company 
has entered into a supply agreement with ISI pursuant to which ISI is 
obligated to use its best efforts to supply the Company's requirements of 
IFN|ga for 

                                      9 
<PAGE>

animal use. However, such agreement may be terminated by ISI under certain 
circumstances. If for any reason HBL and ISI were unwilling or unable to 
supply to the Company IFN|ga, the Company would be required to seek alternate 
sources of such product. The availability of such alternate sources of 
supply, on terms satisfactory to the Company, or at all, is not assured. The 
Company's failure to obtain adequate supplies of IFN|ga at a competitive cost 
or in a timely manner could have a material adverse effect on the Company. 
See "Business." 

   
   Risks Related to Obtaining, Maintaining and Defending Patents and 
Proprietary Technology. The Company's success will depend in part on its 
ability to obtain or license patents, protect trade secrets for its 
technology and operate without infringing on the proprietary rights of 
others. The Company owns two United States patents which expire in 2008 and 
2010 and licenses from HBL and two universities or their affiliates a total 
of nine United States patents which expire on various dates between 2001 and 
2014. The Company also owns or licenses numerous foreign counterparts of such 
patents. The Company's licensors also have eight United States patent 
applications pending. While all claims in seven of such pending applications 
have been initially rejected by the patent examiner, the Company's licensors 
are continuing prosecution of all of such applications to counter the 
rejections with the goal of patent grants. The issued patents are primarily 
"use" patents (which cover the use of IFN|ga for particular purposes). However, 
the patents licensed by the Company from HBL cover certain forms of maltose 
and their use in the manufacture of pharmaceutical dosage forms. The Company 
and its licensors have filed patent applications in certain other areas of 
the world and expect to make additional patent applications in the United 
States and other countries with respect to the use of low doses of IFN|ga for 
oral mucosal administration. There can be no assurance, however, that either 
the Company's or its licensors' existing patent applications will mature into 
issued patents or, if issued, that such patents will be adequate to protect 
the Company's products or processes. In addition, there can be no assurance 
that the Company will be able to obtain any necessary or desired additional 
licenses to patents or technologies of others or that the Company will be 
able to develop its own additional patentable technologies. 

   The Company believes that the patent position of pharmaceutical companies 
generally involves complex legal and factual questions. There can be no 
assurance that any future patent applications or any patents issued to the 
Company will provide it with competitive advantages or that the Company's use 
of its technology will not be challenged as infringing upon the patents or 
proprietary rights of others, or that the patents or proprietary rights of 
others will not have an adverse effect on the ability of the Company to do 
business. Furthermore, there can be no assurance that others will not 
independently develop similar technology or that others will not design 
technology to circumvent the Company's existing or future patents or 
proprietary rights. In the event that the Company's technology were deemed to 
be infringing upon the rights of others, the Company could be subject to 
damages or enjoined from using such technology or the Company could be 
required to obtain licenses to utilize such technology. No assurance can be 
given that any such licenses would be made available on terms acceptable to 
the Company, or at all. If the Company were unable to obtain such licenses, 
it could encounter significant delays in introducing products to the market 
while it attempts to design around the patents or rights infringed upon, or 
the Company's development, manufacture and sale of products requiring such 
licenses could be foreclosed. In addition, the Company could experience a 
loss of revenues and may incur substantial costs in defending itself and 
indemnifying its strategic partners in patent infringement or other actions 
based on proprietary rights violations brought against it or its strategic 
partners. The Company could also incur substantial costs in the event it 
finds it necessary to assert claims against third parties to prevent the 
infringement of its patents and proprietary rights by others. 
    

   The Company relies on proprietary know-how and confidential information 
and employs various methods, such as entering into confidentiality and 
noncompete agreements with its current employees and with third parties to 
whom it has divulged proprietary information, to protect the processes, 
concepts, ideas and documentation associated with its technologies. Such 
methods may afford incomplete protection and there can be no assurance that 
the Company will be able to protect adequately its trade secrets or that 
other companies will not acquire information which the Company considers to 
be proprietary. The Company will be materially adversely affected if it 
cannot maintain its proprietary technologies. See "Business--Patents and 
Proprietary Rights." 

   Competition. The pharmaceutical industry is an expanding and rapidly 
changing industry characterized by intense competition. The Company believes 
that its ability to compete will be dependent in large part upon its ability 
to continually enhance and improve its products and technologies. In order to 
do so, the Company must effectively utilize and expand its research and 
development capabilities and, once developed, expeditiously convert new 
technology into products and processes which can be commercialized. 
Competition is based primarily 

                                      10 
<PAGE>

   
on scientific and technological superiority, technical support, availability 
of patent protection, access to adequate capital, the ability to develop, 
acquire and market products and processes successfully, the ability to obtain 
governmental approvals and the ability to serve the particular needs of 
commercial customers. Corporations and institutions with greater resources 
than the Company may, therefore, have a significant competitive advantage. 
The Company's potential competitors include entities that develop and produce 
therapeutic agents for treatment of human and animal diseases. These include 
numerous public and private academic and research organizations and 
pharmaceutical and biotechnology companies pursuing production of, among 
other things, biologics from cell cultures, genetically engineered drugs and 
natural and chemically synthesized drugs. Almost all of these potential 
competitors have substantially greater capital resources, research and 
development capabilities, manufacturing and marketing resources and 
experience than the Company. The Company's competitors may succeed in 
developing products or processes that are more effective or less costly than 
any that may be developed by the Company, or that gain regulatory approval 
prior to the Company's products. The Company also expects that the number of 
its competitors and potential competitors will increase as more IFN|ga products 
receive commercial marketing approvals from the FDA or analogous foreign 
regulatory agencies. Any of these competitors may be more successful than the 
Company in manufacturing, marketing and distributing its products. There can 
be no assurance that the Company will be able to compete successfully. See 
"Business-Competition." 
    

   Technological Change. The pharmaceutical industry is subject to rapid and 
significant technological change, and the ability of the Company to compete 
is dependent in large part on its ability continually to enhance and improve 
its products and technologies. In order to do so, the Company must 
effectively utilize and expand its research and development capabilities, 
and, once developed, expeditiously convert new technology into products and 
processes which can be commercialized. The Company's competitors may succeed 
in developing technologies, products and processes that render the Company's 
processes and products obsolete. Certain companies, such as Roche, have filed 
applications for or have been issued patents and may obtain additional 
patents and proprietary rights relating to products or processes competitive 
with or otherwise related to those of the Company. The scope and viability of 
these patents, the extent to which the Company may be required to obtain 
licenses under these patents or under other proprietary rights and the cost 
and availability of licenses are unknown, but these factors may limit the 
Company's ability to market its products. See "Business-- Competition." 

   Product Liability Exposure; Uncertainty of Availability of Insurance. The 
Company's business exposes it to potential product liability risks which are 
inherent in the testing, manufacturing, marketing and sale of therapeutic 
products. While the Company will take precautions it deems appropriate, there 
can be no assurance that it will be able to avoid significant product 
liability exposure. Product liability insurance for the pharmaceutical 
industry generally is expensive, to the extent it is available at all. 
Although the Company is currently making limited sales of IFN|ga in Kenya and 
is using IFN|ga in clinical trials, it has not yet sought to obtain product 
liability coverage. The Company intends to obtain product liability insurance 
coverage at such time, if any, that the volume of sales of its products in 
its opinion warrants such coverage. There can be no assurance that it will be 
able to obtain coverage on acceptable terms or that any insurance policy will 
provide adequate protection against potential claims. A successful claim 
brought against the Company in excess of any insurance coverage could have a 
material adverse effect upon the Company. 

   
   Uncertainty of Healthcare Reimbursement and Reform. The healthcare 
industry is subject to changing political, economic and regulatory influences 
that may affect the procurement practices and operations of healthcare 
industry participants. During the past several years, state and federal 
government regulation of reimbursement rates and capital expenditures in the 
United States has increased. Lawmakers continue to propose programs to reform 
the United States healthcare system, which may contain programs to increase 
governmental involvement in healthcare, lower Medicare and Medicaid 
reimbursement rates or otherwise change the operating environment in the 
healthcare industry. Healthcare industry participants may react to these 
proposals by curtailing or deferring use of new treatments for disease, 
including treatments utilizing the biologics that the Company is developing. 
    

   Dependence on Management. The success of the Company will be largely 
dependent on the abilities and continued personal efforts of Dr. Joseph 
Cummins, the Company's founder, Chairman of the Board, President and Chief 
Executive Officer, as well as, to a lesser extent, Dr. Alan Richards, its 
Director of Clinical and Regu 

                                      11 
<PAGE>

latory Affairs, and Charles Hughes, its Vice President-Finance and 
Administration and Chief Financial Officer. Dr. Cummins is employed by the 
Company under an employment agreement expiring December 31, 1999. Dr. 
Richards and Mr. Hughes each have an employment agreement with the Company 
which is terminable by either the individual or the Company on six months 
prior written notice to the other. The loss of the services of Dr. Cummins 
would have a material adverse effect on the Company. The Company is the 
beneficiary of a key man life insurance policy on Dr. Cummins in the amount 
of $2,000,000. It does not own policies covering any other officer or 
employee. The Company is seeking the services of an additional experienced 
senior executive. There can be no assurance that the Company will be able to 
attract such a person. See "Management." 

   Continuing Control by Existing Shareholders. Upon the consummation of this 
offering, HBL and Dr. Joseph Cummins, the Chairman of the Board, President 
and Chief Executive Officer of the Company, will beneficially own 
approximately 31.9% and 13.6%, respectively, of the shares of Common Stock 
outstanding. Katsuaki Hayashibara, the Director of the Research and 
Development Center of HBL, is a director of the Company. In the event that 
HBL and Dr. Cummins were to act in concert, they would be in a position 
generally to control the affairs of the Company. These two shareholders may 
be able to control the outcome of shareholder votes, including votes 
concerning the election of directors, the adoption of amendments to the 
Company's Restated Certificate of Incorporation or By-laws and the approval 
of certain mergers and other significant corporate transactions, including a 
sale of substantially all of the Company's assets. Such control by existing 
shareholders could also have the effect of delaying, deferring or preventing 
a change in control of the Company. Moreover, purchasers of the shares 
offered hereby (other than HBL) will be minority shareholders and, although 
entitled to vote on matters submitted to a vote of shareholders, they will 
not control the outcome of such a vote. See "Principal Shareholders" and 
"Description of Common Stock." 

   Indemnification of Directors and Officers. The Company's By-laws provide 
for the Company to indemnify each director and officer of the Company against 
liabilities imposed upon him (including reasonable amounts paid in 
settlement) and expenses incurred by him in connection with any claim made 
against him or any action, suit or proceeding to which he may be a party by 
reason of his being or having been a director or officer of the Company. The 
Company has also entered into Indemnification Agreements with each officer 
and director pursuant to which the Company will, in general, indemnify such 
persons to the maximum extent permitted by the Company's By-laws and the laws 
of the State of Texas against any expenses (including attorneys' fees), 
judgments, fines and amounts paid in settlement incurred in connection with 
any actual or threatened action or proceeding to which such director or 
officer is made or threatened to be made a party by reason of the fact that 
such person is or was a director or officer of the Company. The foregoing 
provisions may reduce the likelihood of derivative litigation against 
directors and may discourage or deter shareholders or management from suing 
directors for breaches of their duty of care, even though such an action, if 
successful, might otherwise benefit the Company and its shareholders. See 
"Management -- Indemnification of Directors and Officers." 

   
   Broad Discretion by Management in Application of Proceeds. Although the 
Company currently intends to use approximately $6,350,000 (77.7%) of the net 
proceeds of this offering to fund the Primary Development Projects, it will 
have broad discretion in the use of such funds as circumstances warrant. In 
addition, approximately $825,000 (10.1%) of the estimated net proceeds from 
this offering has been allocated to working capital and general corporate 
purposes. Accordingly, the Company's management will have broad discretion as 
to the application of such proceeds. See "Use of Proceeds." 

   No Assurance of Public Market; Arbitrary Determination of Offering Price; 
Possible Volatility of Market Price of Common Stock. Prior to this offering, 
there has been no public trading market for the Common Stock. Consequently, 
the initial public offering price has been determined by negotiation between 
the Company and the Underwriter and is not necessarily related to the 
Company's asset value, net worth or other criteria of value. Among the 
factors considered in determining the offering price were the Company's 
financial condition and prospects, management, market prices of similar 
securities of comparable publicly-traded companies, certain financial and 
operating information of companies engaged in activities similar to those of 
the Company and the general condition of the securities market. There can be 
no assurance that a regular trading market will develop after this offering 
or that, if developed, it will be sustained. The market prices for securities 
of biotechnology companies have been volatile. Announcements of technological 
innovations or new products by the Company or 
    

                                      12 
<PAGE>

its competitors, developments concerning proprietary rights (including 
patents and litigation matters), publicity regarding actual or potential 
clinical testing relating to products under development by the Company or 
others, regulatory developments in both the United States and foreign 
countries, public concern as to the safety of biotechnology products and 
economic and other external factors, as well as period-to-period fluctuations 
in financial results, may have a significant impact on the market price of 
the Common Stock. Additionally, in recent years, the stock market has 
experienced a high level of price and volume volatility and market prices for 
the stock of many companies, particularly the common stock of small and 
emerging growth companies that trade in the over-the-counter market, have 
experienced wide price fluctuations not necessarily related to the operating 
performance of such companies. See "Underwriting." 

   
   Benefits of Offering to Existing Shareholders. Upon the consummation of 
this offering, the existing shareholders of the Company will receive 
substantial benefits, including the creation of a public trading market for 
their securities and the corresponding facilitation of sales by such 
shareholders of their shares of Common Stock in the secondary market, as well 
as an immediate increase in net tangible book value of $1.77 per share to 
such shareholders based upon the pro forma net tangible book value per share 
after this offering and the initial public offering price per share of the 
Common Stock offered hereby. The existing shareholders of the Company have 
acquired their respective equity interests at costs substantially below the 
offering price. Accordingly, to the extent that the Company incurs losses, 
the investors purchasing shares in this offering will bear a disproportionate 
risk of such losses. If, at the time the existing shareholders are able to 
sell their shares of Common Stock in the public market, the market price per 
share remains at the $5.00 initial public offering price (of which there can 
be no assurance) such shareholders would realize an aggregate gain of 
$11,951,082 ($3.84 per share) on the sale of all of their existing shares. 
Additionally, $1,000,000 of the proceeds of this offering will be used to 
repay indebtedness owing by the Company to HBL, which is an existing 
shareholder. See "Use of Proceeds," "Dilution" and "Shares Eligible for 
Future Sale." 

   Shares Eligible for Future Sale. Upon the consummation of this offering, 
the Company will have 5,114,232 shares of Common Stock outstanding. Up to 
600,000 of the 2,000,000 shares offered hereby may be purchased by HBL and, 
if purchased, will be subject to certain restrictions on sale imposed under 
the federal securities laws. The remaining shares of Common Stock offered 
hereby will be freely tradeable without restriction or further registration 
under the Securities Act of 1933, as amended (the "Securities Act"). All of 
the 3,035,232 shares of Common Stock outstanding as of the date of this 
Prospectus are, and all of the 79,000 shares to be issued to three officers 
of the Company simultaneously with the consummation of the sale of the Common 
Stock offered hereby, including 30,000 shares to each of Dr. Cummins and Dr. 
Richards and 19,000 shares to Mr. Hughes, will be, "restricted securities" as 
that term is defined under Rule 144 promulgated under the Securities Act. 
Such shares may only be sold pursuant to a registration statement under the 
Securities Act, in compliance with the exemptive provisions of Rule 144 or 
pursuant to another exemption under the Securities Act. Of such 3,114,232 
restricted shares of Common Stock, an aggregate of 1,040,976 shares are 
immediately eligible for sale, without registration, under Rule 144 (subject 
to the contractual restrictions described below). An additional 1,964,616 
shares will become eligible for sale (subject to the volume limitations 
prescribed in Rule 144 and such contractural restrictions) commencing 90 days 
after the date of this Prospectus. The balance of such shares will become 
eligible for sale at various times commencing in January 1997. In general, 
under Rule 144 as currently in effect, subject to the satisfaction of certain 
other conditions, a person (or persons whose shares are aggregated for this 
purpose), including an affiliate of the Company, who has owned restricted 
shares of Common Stock beneficially for at least two years is permitted to 
sell in the open market within any three- month period a number of shares 
that does not exceed the greater of 1% of the outstanding shares of the same 
class or, if the Common Stock is quoted on NASDAQ, the average weekly trading 
volume during the four calendar weeks preceding the filing of the required 
notice of sale. A person who has not been an affiliate of the Company for at 
least the three months immediately preceding the sale and who has 
beneficially owned shares of Common Stock as described above for at least 
three years is entitled to sell such shares under Rule 144 without regard to 
any of the limitations described above. The Company and its officers and 
directors and shareholders owning of record more than 99% of the Common Stock 
outstanding as of the date of this Prospectus, have agreed with the 
Underwriter not to sell or otherwise dispose of any shares of Common Stock 
for a period of 12 months after the date of this Prospectus, without the 
Underwriter's prior written consent. No predictions can be made of the 
effect, if any, that sales of Common Stock in the market or the availability 
of shares of Common Stock for sale under Rule 144 will have on the market 
price of Common Stock prevailing from time to time. 
    

                                      13 
<PAGE>

Nevertheless, the possibility that substantial amounts of Common Stock may be 
sold in the public market may adversely affect prevailing market prices for 
the Common Stock and could impair the Company's ability to raise capital 
through the sale of its equity securities. See "Shares Eligible for Future 
Sale" and "Underwriting." 

   
   Outstanding Options. Upon the consummation of this offering, there will be 
40,500 shares of Common Stock reserved for issuance upon the exercise of 
stock options outstanding under the Company's 1996 Employee Stock Option Plan 
(the "Employee Plan") and 75,000 shares of Common Stock reserved for issuance 
upon exercise of stock options outstanding under the Company's Outside 
Director and Advisor Stock Option Plan (the "Director Plan" and together with 
the Employee Plan, the "Plans"). None of the foregoing options is currently 
exercisable. An additional 134,500 shares are reserved for issuance upon 
exercise of options available for future grant under the Plans. All of the 
options outstanding upon consummation of this offering will be exercisable at 
a price of $5.00 per share. To the extent the market price of Common Stock at 
the time of exercise exceeds the exercise price, the exercise of the 
foregoing options will have a dilutive effect on the Company's shareholders. 
Moreover, the terms upon which the Company may be able to obtain additional 
equity may be adversely affected, since the holders of the options can be 
expected to exercise them at a time when the Company would, in all 
likelihood, be able to obtain any needed capital on terms more favorable to 
the Company than those provided in the options. See "Management - Stock 
Option Plans" and "Shares Eligible for Future Sale." 

   Immediate and Substantial Dilution. This offering involves an immediate 
and substantial dilution of $3.69 (73.8%) between the pro forma net tangible 
book value per share of Common Stock after the offering and the initial 
public offering price of $5.00 per share. See "Dilution." 

   No Dividends. To date, the Company has not paid any cash dividends on its 
Common Stock and it does not expect to declare or pay dividends on the Common 
Stock in the foreseeable future. In addition, future agreements or credit 
facilities may restrict dividend payments. See "Dividend Policy" and 
"Description of Common Stock." 

   Possible Delisting of Securities from NASDAQ System; Risks of Low-Priced 
Stocks. It is anticipated that the Company's Common Stock will be quoted on 
NASDAQ on the date of this Prospectus. However, in order to continue to be 
listed on NASDAQ, a company must maintain $2,000,000 in total assets, a 
$200,000 market value of the public float and $1,000,000 in total capital and 
surplus. In addition, continued inclusion requires two market makers and a 
minimum bid price of $1.00 per share; provided, however, that if a company 
falls below such minimum bid price, it will remain eligible for continued 
inclusion on NASDAQ if the market value of the public float is at least 
$1,000,000 and the company has $2,000,000 in capital and surplus. The failure 
to meet these maintenance criteria in the future may result in the delisting 
of the Company's Common Stock from NASDAQ and trading, if any, in the 
Company's Common Stock would thereafter be conducted in the non- NASDAQ 
over-the-counter market. As a result of such delisting, an investor may find 
it more difficult to dispose of, or to obtain accurate quotations as to the 
market value of, the Company's Common Stock. 

   In addition, if the Common Stock were to become delisted from trading on 
NASDAQ and the trading price of the Common Stock were to fall below $5.00 per 
share, trading in the Common Stock would also be subject to the requirements 
of certain rules promulgated under the Securities Exchange Act of 1934, as 
amended (the "Exchange Act"), which require additional disclosure by 
broker-dealers in connection with any trades involving a stock defined as a 
"penny stock" (generally, any non-NASDAQ equity security that has a market 
price of less than $5.00 per share, subject to certain exceptions). Such 
rules require the delivery, prior to any penny stock transaction, of a 
disclosure schedule explaining the penny stock market and the risks 
associated therewith, and impose various sales practice requirements on 
broker-dealers who sell penny stocks to persons other than established 
customers and accredited investors (generally defined as an investor with a 
net worth in excess of $1,000,000 or annual income exceeding $200,000, 
$300,000 together with a spouse). For these types of transactions, the 
broker-dealer must make a special suitability determination for the purchaser 
and have received the purchaser's written consent to the transaction prior to 
sale. The broker-dealer also must disclose the commissions payable to the 
broker-dealer, current bid and offer quotations for the penny stock and, if 
the broker-dealer is the sole market-maker, the broker-dealer must disclose 
this fact and the broker-dealer's presumed control over the market. Such 
information must be provided to the customer orally or in writing prior to 
effecting the transaction and in writing before or with the customer 
confirmation. Monthly statements must be sent disclosing recent price 
information for the penny stock held in the account and information on the 
limited market in penny stocks. The additional burdens imposed upon 
broker-dealers by such requirements may discourage them from effecting 
transactions in the Common Stock, which could severely limit the liquidity of 
the Common Stock and the ability of purchasers in this offering to sell the 
Common Stock in the secondary market. 
    

                                      14 
<PAGE>

                               USE OF PROCEEDS 

   The net proceeds to the Company from the sale of the 2,000,000 shares of 
Common Stock offered hereby, after deducting underwriting discounts and 
commissions and other expenses of the offering are estimated to be 
approximately $8,175,000 ($9,480,000 if the Underwriter's over-allotment 
option is exercised in full). The Company expects to use such net proceeds 
approximately as follows: 

<TABLE>
<CAPTION>
                                                      Approximate      Approximate 
                                                        Dollar        Percentage of 
Application of Proceeds                                 Amount        Net Proceeds 
 -------------------------------------------------   -------------   --------------- 
<S>                                                  <C>             <C>
Research and development(1)  .....................    $6,350,000           77.7% 
Repayment of indebtedness to HBL (2)  ............     1,000,000           12.2 
Working capital and general corporate purposes(3) .      825,000           10.1 
                                                     -------------   --------------- 
    Total  .......................................    $8,175,000          100.0% 
                                                     =============   =============== 

</TABLE>

- ------ 
(1) Represents a portion of the costs associated with the Primary Development 
    Projects, including the cost of conducting clinical trials to determine 
    the safety, efficacy and optimal dosages of low dose oral IFN|ga for 
    indicated uses as well as other direct and indirect costs. The Company 
    estimates that the amounts required to complete the Primary Development 
    Projects will be substantially in excess of the portion of the proceeds 
    allocated to research and development. See "Business--Research and 
    Development." 

(2) The Company has borrowed $3,000,000 from HBL, of which $1,000,000 
    borrowed after March 31, 1996, bearing interest at the rate of 4% per 
    annum, is required to be repaid upon the consummation of the sale of 
    Common Stock offered hereby. The Company has used the proceeds of loans 
    made to it by HBL for research and development and general corporate 
    purposes. 

(3)  Pursuant to agreements between the Company and three of its officers, 
     simultaneously with the consummation of this offering the Company was to 
     have issued an aggregate of 126,000 shares to such officers. In 
     satisfaction of such obligation, the Company will issue 79,000 shares 
     and use $235,000 of the proceeds of this offering to satisfy required 
     tax withholding relating to such transaction. In addition, a portion of 
     the proceeds allocated to working capital is expected to be utilized to 
     pay the salaries of the Company's three executive officers, which 
     salaries are anticipated to aggregate approximately $281,500 for the 12 
     months following the consummation of this offering. See "Management" and 
     "Certain Transactions." 

   If the Underwriter exercises its over-allotment option in full, the 
Company will receive additional net proceeds of approximately $1,305,000, 
which amount will be utilized for research and development. 

   The allocation of the net proceeds of this offering set forth above 
represents the Company's best estimates based upon its current plans and 
certain assumptions regarding the Company's future revenues and expenditures. 
If any of these factors change, the Company may find it necessary or 
advisable to reallocate some of the proceeds within the above-described 
categories or to use portions thereof for other purposes. 

   
   The Company estimates that, over approximately the next three years, 
approximately $4,500,000 and $3,800,000 will be needed for regulatory 
compliance and clinical trials with respect to low dose oral IFN|ga therapy for 
the treatment of Sjogren's syndrome and oral mucositis, respectively, 
approximately $2,000,000 will be needed for HCV testing in Mexico and Canada 
and approximately $800,000 will be needed for HBV testing in Mexico, subject 
to obtaining regulatory approvals in such countries. The amounts actually 
expended by the Company for these activities may vary significantly from the 
foregoing estimates as a result of a variety of factors, including the timing 
of regulatory approvals (if such approvals are given at all), the status of 
competitive products, technological advances made by the Company or others, 
the progress of the Company's research and development efforts, the 
availability of funding from institutions or corporate sponsors and 
determinations regarding the commercial potential of the Company's products, 
including other products the Company is currently developing and new products 
the Company may identify. The Company may abandon, deemphasize or expand its 
activities with respect to one or more of the Primary Development Projects 
and may use a portion of the proceeds of this offering for other projects as 
circumstances warrant. 
    

                                      15 
<PAGE>

   
   The Company anticipates, based on its currently proposed plans and 
assumptions relating to its operations (including assumptions regarding the 
progress of its research and development and the timing and costs associated 
with the Primary Development Projects), that the net proceeds of this 
offering, together with the Company's existing capital resources, will be 
sufficient to satisfy the Company's estimated cash requirements for at least 
12 months following the consummation of this offering. As set forth above, 
the Company estimates that an aggregate of $11,100,000 will be needed over 
approximately the next three years to complete the Primary Development 
Projects. Such amount is in excess of the net proceeds of this offering and 
the existing capital of the Company. Therefore, unless the Company generates 
significant revenues during such period, which the Company believes is 
unlikely, the Company will need additional financing to fully fund such 
development. The Company has no current arrangements with respect to, or 
sources of, additional financing and it is not anticipated that any of the 
officers, directors or shareholders of the Company (including HBL) will 
provide any portion of the Company's financing requirements. There can be no 
assurance that, when needed, any additional financing will be available to 
the Company on commercially reasonable terms, or at all. In the event the 
Company's plans change, its assumptions change or prove to be inaccurate, or 
if the net proceeds of this offering, together with other capital resources, 
otherwise prove to be insufficient to fund operations, the Company could be 
required to seek additional financing sooner than currently anticipated. 
    

   Proceeds not immediately required for the purposes described above will be 
invested principally in United States Government securities, bank 
certificates of deposit, money market funds or other short-term interest- 
bearing investments. 

                               DIVIDEND POLICY 

   To date, the Company has not declared or paid any cash dividends on its 
Common Stock and does not expect to declare or pay any dividends in the 
foreseeable future. Instead, the Company intends to retain all earnings, if 
any, for use in the Company's business operations. 

                                      16 
<PAGE>

                                   DILUTION 

   The difference between the public offering price per share of the Common 
Stock and the pro forma net tangible book value per share of the Common Stock 
after completion of this offering constitutes the dilution to investors in 
this offering. Net tangible book value per share on any given date is 
determined by dividing the Company's net tangible book value (total tangible 
assets less total liabilities) on such date by the number of outstanding 
shares of Common Stock. 

   
   At March 31, 1996, the negative net tangible book value of the Company was 
$(1,383,475) or approximately $(.46) per share of Common Stock. After giving 
effect to the sale by the Company of 2,000,000 shares of Common Stock offered 
hereby (less underwriting discounts and commissions and estimated expenses of 
this offering and assuming no exercise of the Underwriter's over-allotment 
option or the Underwriter's Warrants) and the issuance of 79,000 shares and 
the use of $235,000 of the proceeds of this offering simultaneously with such 
sale to satisfy withholding tax obligations relating to such transaction, the 
pro forma net tangible book value of the Company at March 31, 1996 would have 
been $6,681,212, or approximately $1.31 per share of Common Stock. This 
represents an immediate increase in net tangible book value of $1.77 per 
share to the existing shareholders and an immediate dilution of $3.69 per 
share (73.8%) to new investors. The following table illustrates this dilution 
to new investors on a per share basis: 
    

<TABLE>
<CAPTION>
<S>                                                     <C>            <C>
 Public offering price  ..........................                     $5.00 
     Negative net tangible book value before offering    $(.46) 
     Increase attributable to new investors  ....         1.77 
                                                        -------- 
Pro forma net tangible book value after offering .                      1.31 
                                                                       ------- 
Dilution to new investors  ......................                      $3.69 

</TABLE>

   The following table sets forth, with respect to the Company's existing 
shareholders (including three employees of the Company who will be issued an 
aggregate of 79,000 shares simultaneously with the consummation of the sale 
of the Common Stock offered hereby) and new investors in this offering a 
comparison of the number of shares of Common Stock purchased from the 
Company, the percentage ownership of such shares, the total consideration 
paid, the percentage of total consideration paid and the average price per 
share: 

<TABLE>
<CAPTION>
                                                                                  Average 
                                                                                 Price Per 
                            Shares Purchased          Total Consideration          Share 
                        ------------------------   --------------------------   ----------- 
                           Number       Percent        Amount       Percent 
                         -----------   ---------    -------------   --------- 
<S>                     <C>            <C>          <C>             <C>         <C>
Existing shareholders .   3,114,232       60.9%     $ 3,620,078       26.6%        $1.16 
New investors  .......    2,000,000       39.1       10,000,000       73.4          5.00 
                         -----------   ---------    -------------   ---------   ----------- 
  Total  .............    5,114,232      100.0%     $13,620,078      100.0% 
                         ===========   =========    =============   ========= 

</TABLE>

   The above table assumes no exercise of the Underwriter's over-allotment 
option. If the Underwriter's over- allotment option is exercised in full, the 
new investors will have paid $11,500,000 or 76.1% of the total consideration, 
for 2,300,000 shares, or approximately 42.5% of the total number of shares of 
Common Stock outstanding. See "Underwriting." 

                                      17 
<PAGE>

                                CAPITALIZATION 

   The following table sets forth the capitalization of the Company as of 
March 31, 1996 on a historical basis and as adjusted to give effect to the 
Company's sale of 2,000,000 shares of Common Stock offered hereby and the 
application of the estimated net proceeds therefrom. 

<TABLE>
<CAPTION>
                                                               March 31, 1996 
                                                      ------------------------------- 
                                                          Actual       As Adjusted(1) 
                                                       -------------   -------------- 
<S>                                                   <C>              <C>
Notes payable to related party(2)  .................    $ 2,000,000     $ 2,000,000 
                                                       -------------   -------------- 
Shareholders' equity (deficit) 
        Common Stock, $.01 par value, 10,000,000 shares 
          authorized, 3,048,672 shares issued, 
          5,114,232 shares as adjusted(3)  .........         30,487          51,142 
        Additional paid-in capital .................      3,589,591      12,112,936 
        Deficit accumulated during the development 
          stage.  ..................................     (4,943,168)     (5,448,481) 
        Unrealized gain on marketable securities ...         30,000          30,000 
        Treasury stock -- 13,440 shares(4) .........        (26,000)             -- 
                                                       -------------   -------------- 
          Total shareholders' equity (deficit) .....     (1,319,090)      6,745,597 
                                                       -------------   -------------- 
            Total capitalization ...................    $   680,910     $ 8,745,597 
                                                       =============   ============== 

</TABLE>

- ------ 
(1) Gives effect to the issuance of 79,000 shares of Common Stock to three 
    officers of the Company and the use of $235,000 of the proceeds of this 
    offering simultaneously with the sale of the Common Stock offered hereby 
    to satisfy withholding tax obligations relating to such transaction. See 
    "Management-Employment Agreements." 

(2) Represents the outstanding principal amounts of two $1,000,000 promissory 
    notes issued to HBL in September 1991 and September 1992, respectively. 
    Accrued interest on such notes was $483,699 as of March 31, 1996. The 
    notes are due on September 16, 1996 and September 25, 1997, respectively, 
    provided that principal and accrued interest thereon are required to be 
    paid only out of 10% of the Company's gross revenues from its sales of 
    IFN. The notes bear interest at the rate of 6% per annum. Since repayment 
    of the notes is dependent on future sales of IFN by the Company, material 
    amounts of which are not expected within the next year, they are 
    classified as non-current liabilities. 

   
(3) Does not include (i) 200,000 shares of Common Stock reserved for issuance 
    upon exercise of the Underwriter's Warrants; (ii) an aggregate of 115,500 
    shares of Common Stock reserved for issuance upon the exercise of stock 
    options to be outstanding under the Plans, none of which options are 
    currently exercisable; or (iii) an aggregate of 134,500 shares of Common 
    Stock reserved for issuance upon exercise of stock options which are 
    available for future grant under the Plans. See "Management-Stock Option 
    Plans," "Principal Shareholders," "Certain Transactions" and 
    "Underwriting." 

(4) On May 14, 1996, the Board of Directors of the Company approved the 
    cancellation of all treasury shares. 
    

                                      18 
<PAGE>

                           SELECTED FINANCIAL DATA 

   
   The selected financial data presented below under the captions 
"Consolidated Statement of Operations Data" and "Consolidated Balance Sheet 
Data" for the two years ended December 31, 1995 and as of December 31, 1995 
are derived from the consolidated financial statements of the Company and its 
subsidiaries (companies in the development stage) included elsewhere in this 
Prospectus, which financial statements have been audited by Ernst & Young 
LLP, independent auditors. Financial data for the three months ended March 
31, 1995 and March 31, 1996 and the period from June 25, 1984 (inception) 
through March 31, 1996 and as of March 31, 1996 are unaudited and, in the 
opinion of the Company's management, contain all adjustments (consisting only 
of normal recurring adjustments) necessary for a fair presentation thereof. 
Results for the three months ended March 31, 1996 are not indicative of the 
results that may be expected for the full 1996 fiscal year. The selected 
financial data should be read in conjunction with the consolidated financial 
statements, the related notes and the independent auditors' report, appearing 
elsewhere in this Prospectus. 
    

CONSOLIDATED STATEMENT OF OPERATIONS DATA: 

<TABLE>
<CAPTION>
                                                                                              
                                                                                              Cumulative From 
                                                                                               June 25, 1984  
                                                                  Three Months Ended March      (Inception)   
                                     Year Ended December 31,                31,                   Through     
                                  ----------------------------   --------------------------      March 31,    
                                       1994           1995           1995          1996            1996 
                                   ------------   ------------    -----------   -----------   --------------- 
<S>                               <C>             <C>             <C>           <C>           <C>
Total revenues  ................    $2,653,331     $2,006,262     $  647,069    $  415,728      $10,570,886 
Total expenses  ................     2,782,570      2,317,841        722,003       402,921       15,514,054 
Net income (loss)  .............      (129,239)      (311,579)       (74,934)       12,807       (4,943,168) 
Net loss per share  ............          (.04)          (.10)          (.02)           -- 
Weighted average shares 
  outstanding ..................     3,005,592      3,034,339      3,031,609     3,035,232 

</TABLE>

CONSOLIDATED BALANCE SHEET DATA: 

<TABLE>
<CAPTION>
                                                                                 March 31, 1996 
                                                                        ------------------------------- 
                                                     December 31, 1995      Actual       As Adjusted(1) 
                                                     -----------------   -------------    -------------- 
<S>                                                  <C>                <C>              <C>
Cash and cash equivalents  .......................      $ 1,108,527       $   724,280      $ 8,664,280 
Working capital (deficiency)  ....................          (18,035)           (2,585)       8,062,102 
Total assets  ....................................        1,791,060         1,424,004        9,364,004 
Total liabilities  ...............................        3,152,957         2,743,094        2,618,407 
Deficit accumulated during the development stage .       (4,955,975)       (4,943,168)      (5,448,481) 
Shareholders' equity (deficit)  ..................       (1,361,897)       (1,319,090)       6,745,597 

</TABLE>

- ------ 
(1) Gives effect to the sale of 2,000,000 shares of Common Stock offered 
    hereby and the anticipated application of the estimated net proceeds 
    therefrom, including the payment of $235,000 to satisfy withholding tax 
    obligations of the Company arising in a transaction required under the 
    employment agreements of three officers in which the Company shall also 
    issue 79,000 shares of Common Stock to such officers. Subsequent to March 
    31, 1996, the Company borrowed $1,000,000 from HBL, which amount will be 
    repaid from the proceeds of this offering. See "Use of Proceeds" and 
    "Certain Transactions." 

                                      19 
<PAGE>

                   MANAGEMENT'S DISCUSSION AND ANALYSIS OF 
                FINANCIAL CONDITION AND RESULTS OF OPERATIONS 

GENERAL 

   Since June 1984, the Company, a development stage company, has been 
engaged almost exclusively in research and development activities focused on 
developing biologics for the treatment of human and animal diseases. Other 
than limited sales of natural IFN|ga in Kenya, the Company has not yet 
commenced any significant product commercialization and, until such time as 
it does, will not generate significant product revenues. The Company has 
incurred significant operating losses since its inception resulting in an 
accumulated deficit of $4,943,168 at March 31, 1996. Beginning in April 1996, 
the rate of loss increased and such losses are expected to continue for the 
foreseeable future and until such time, if ever, as the Company is able to 
attain sales levels sufficient to support its operations. 

RESULTS OF OPERATIONS 
THREE MONTHS ENDED MARCH 31, 1996 COMPARED TO THREE MONTHS ENDED MARCH 31, 
1995 

   During the three months ended March 31, 1996 (the "1996 Quarter") and the 
three months ended March 31, 1995 (the "1995 Quarter") the Company recorded 
total revenues of $415,728 and $647,069, respectively. $402,574 of the 1996 
revenues and $618,266 of the 1995 revenues were contract revenues recognized 
during the respective periods. Other revenues consisted primarily of interest 
income of $11,154 and $28,803 for the 1996 and 1995 quarters, respectively. 
Of the $9 million contract revenues received from HBL from 1992 through 1994, 
all but $14,566 has been recognized as income as of the end of the 1996 
Quarter. Beginning in April 1996, the Company will no longer have contract 
revenues to offset expenditures as they are incurred. Accordingly, the 
Company anticipates a significant increase in net losses. 

   During the 1996 Quarter, research and development expenses were $134,209 
as compared to $247,978 for the 1995 Quarter. The decrease of $113,769 was 
the result of fewer clinical studies conducted and completed in the 1996 
Quarter. 

   General and administrative expenses were $238,712 during the 1996 Quarter 
as compared to $444,025 during the 1995 Quarter. The primary reason for the 
decrease was fewer employees in the 1996 Quarter (eight compared to eleven) 
and litigation expense in the 1995 Quarter of $103,737 compared to none in 
the 1996 Quarter. 

YEAR ENDED DECEMBER 31, 1995 COMPARED TO YEAR ENDED DECEMBER 31, 1994 

   During the year ended December 31, 1995, the Company had total revenues of 
$2,006,262 compared to total revenues of $2,653,331 during the year ended 
December 31, 1994. $550,000 of the revenues for 1995 were received in 
connection with the settlement of a patent infringement action brought by the 
Company in New Zealand. Of the total settlement amount, $50,000 was in 
exchange for the grant by the Company of a sublicense of the technology that 
was the subject of the lawsuit and $500,000 was a reimbursement of research 
and development cost incurred by the Company. Other revenues for 1995 
consisted of interest income of $94,867 and deferred contract revenues 
recognized in the amount of $1,361,395. Had the Company not received the 
$500,000 payment toward research and development costs from the settlement, 
the remaining balance of deferred contract revenue ($417,140) would have been 
recognized as contract revenue in 1995. During 1994, deferred contract 
revenues of $2,480,093 were recorded as earned based on research and 
development and administrative costs incurred. Other 1994 revenues consisted 
of interest income of $132,713 and interferon sales of $40,525. 

   During 1995, research and development expenses were $875,093 as compared 
to $1,364,042 during 1994. The decrease of $488,949 in 1995 was the result of 
certain clinical studies being completed in 1994 and the continuation of 
certain other studies into 1996. It is anticipated that approximately $76,000 
will be paid by the Company in 1996 for 1995 studies which will be completed 
in 1996. 

   During 1995 and 1994, the Company incurred general and administrative 
expenses of $1,322,748 and $1,298,528, respectively. Over all, general and 
administrative expenses for 1995 were lower than 1994. However, the Company 
recorded a $150,000 discount on its investment in ISI common stock due to 
certain restric- 

                                      20 
<PAGE>

tions placed on the sale of such stock. The Company acquired 312,500 shares 
of ISI common stock for $625,000, or $2.00 per share, representing the quoted 
market price of ISI stock at that time. The stock was acquired as a result of 
an agreement with ISI to allow the sublicense by the Company to others of 
certain products previously exclusively licensed to ISI. 

LIQUIDITY AND CAPITAL RESOURCES 

   At March 31, 1996, the Company had cash of $724,280 with accounts payable 
of $100,175 and other funding commitments for clinical studies of 
approximately $36,000. Deferred contract revenues of $14,566 at March 31, 
1996 represents contract revenues received from HBL in advance of services to 
be performed for research and development activities. 

   
   The Company has borrowed $2 million from HBL and the notes accrue interest 
at the rate of 6% per annum with accrued interest of $483,699 at March 31, 
1996. The accrued interest and principal are to be paid only from 10% of the 
Company's gross revenues from sales of IFN. The Company has borrowed from HBL 
an additional $500,000 in May 1996 and $500,000 in June 1996. Such additional 
loans bear interest at the rate of 4% per annum and will be paid in full 
simultaneously with the consummation of this offering. 
    

   At the present time, the Company's only sales of IFN|ga are to Kenya and 
such sales are insignificant. Accordingly, the Company believes that losses 
from operations will continue until such time, if ever, as the Company 
receives approval from the FDA, so that commercial marketing of the Company's 
products can begin in the United States. Also, approval is being sought in 
certain foreign countries for product sales. However, there can be no 
assurance that such approvals will occur. 

   
   The Company anticipates, based on its currently proposed plans and 
assumptions relating to its operations (including assumptions regarding the 
progress of its research and development and the timing and costs associated 
with the Primary Development Projects), that the net proceeds of this 
offering, together with the Company's existing capital resources, will be 
sufficient to satisfy the Company's estimated cash requirements for at least 
12 months following the consummation of this offering. The Company estimates 
that an aggregate of $11,100,000 will be needed over approximately the next 
three years to complete its Primary Development Projects. Such amount is in 
excess of the net proceeds of this offering and the existing capital of the 
Company. Therefore, unless the Company generates significant revenues during 
such period, which the Company believes is unlikely, the Company will need 
additional financing to fully fund such development. The Company has no 
current arrangements with respect to, or sources of, additional financing and 
it is not anticipated that any of the officers, directors or shareholders of 
the Company (including HBL) will provide any portion of the Company's future 
financing requirements. There can be no assurance that, when needed, 
additional financing will be available to the Company on commercially 
reasonable terms, or at all. In the event that the Company's plans change, 
its assumptions change or prove inaccurate, or if the net proceeds of this 
offering, together with other capital resources, otherwise prove to be 
insufficient to fund operations, the Company could be required to seek 
additional financing sooner than currently anticipated. Any inability to 
obtain additional financing when needed would have a material adverse effect 
on the Company, including requiring the Company to significantly curtail or 
possibly cease its operations. 
    

                                      21 
<PAGE>

                                   BUSINESS 

GENERAL 

   The Company, a development-stage company, is engaged in developing 
biologics for the treatment of human and animal diseases. The Company is 
currently focusing its research on human health indications for the use of 
low dose oral natural IFN|ga, particularly for the treatment of Sjogren's 
syndrome, oral mucositis in cancer patients and hepatitis B and C. The 
Company believes that significant worldwide opportunities exist for the 
development of low dose oral natural IFN|ga as an inexpensive, non-toxic, 
efficacious alternative to the treatment of disease by injection of high 
doses of IFN|ga. In addition, the Company believes that low dose oral natural 
IFN|ga can be an effective treatment for diseases or conditions for which 
current therapies are inadequate. 

   
   The Company owns or licenses eleven United States patents relating to low 
dose oral natural IFN|ga. Since 1992, the Company has filed, and there now are 
in effect, seven Investigational New Drug Applications covering indicated 
uses for low dose oral IFN|ga, including treatment of Sjogren's syndrome and 
oral mucositis. The Company is seeking regulatory approvals in certain 
foreign countries to test and/or market low dose oral IFN|ga for the treatment 
of hepatitis B and C. 
    

   The Company is also testing oral IFN|ga in cats with herpesvirus-1 
infection, dogs with keratoconjunctivitis sicca and cattle with shipping 
fever or mastitis and has filed and there are now in effect Investigational 
New Animal Drug Applications for these and other indications for the product 
in animals. The Company is also testing a topical IFN|ga as a treatment for 
genital warts in humans. 

   The Company's objective is to exploit its proprietary technology to become 
a leader in the field of low dose oral IFN|ga applications. The Company's 
business strategy is to pursue those indications for low dose oral IFN|ga 
treatment for which initial clinical research has indicated the treatment is 
efficacious and which in the opinion of the Company have the greatest 
commercial potential and are most likely to be approved by the FDA. To the 
extent possible, the Company will attempt to minimize the cost to the Company 
of obtaining FDA approval by utilizing forms of IFN|ga already approved (in 
other dosage forms and for different indications) by the Japanese Ministry of 
Health and Welfare for human use or by the FDA for animal use. The Company 
believes such minimized costs will be the result of more information 
available for use in preparing applications for such approvals. The Company 
will attempt to gain market share for approved products by forming alliances 
with strong marketing partners. 

IFN|ga 

   The bodies of humans and animals maintain delicately balanced immune 
systems that fight disease and injury. Substances such as IFN|ga, which are 
produced by the body in small quantities, play important roles in the 
maintenance of these systems. The Company believes that IFN|ga and other 
biologics show great promise as weapons against disease and for use in 
therapy. 

   IFN|ga has antiviral, antiproliferative and immunomodulatory properties and 
is used therapeutically in humans with various chronic disorders. IFN|ga may 
reduce inflammation by eliminating persistent viral infection, modulating the 
allergic response or attenuating factors which cause inflammation. 

   In recent years IFN|ga has been used as a biologic and various techniques 
have been discovered for the mass production of IFN|ga and other biologics. The 
prevailing view is that for IFN|ga to be effective, sufficient concentrations 
of the substance must reach the disease site, by means of either local or 
distal administration of the IFN|ga. If IFN|ga is disseminated in the 
bloodstream, high doses of IFN|ga would be required to assure that sufficient 
amounts of IFN|ga reach the diseased tissue. Such approaches have proven 
effective in many instances, but high-dose systemic IFN|ga therapy has the 
disadvantage of significant side effects in many cases as well as expense. 

   The Company has focused its efforts on the use of IFN|ga in low doses since 
such use mimics the way the body naturally produces and utilizes the 
substance. It has accumulated data that indicate that oral administration 

                                      22 
<PAGE>

of IFN|ga , at very low doses, can trigger systemic alterations which augment 
the body's disease-fighting mechanisms. Such oral application of low dose 
IFN|ga is without the adverse side effects of high-dose IFN|ga administration. 
Moreover, low dose treatment which is administered orally or topically is 
more economical than treatment by injection of high dose IFN|ga. 

   The Company has conducted preliminary research on various human and animal 
indications for the use of low dose oral IFN|ga therapy and, based upon initial 
results, intends to focus its development activities on the applications 
discussed below. 

HUMAN HEALTH APPLICATIONS 

   Sjogren's Syndrome. Sjogren's syndrome is a chronic autoimmune disorder 
characterized by severe dryness of the eyes and mouth. It can exist as a 
primary disorder or in association with other autoimmune diseases such as 
rheumatoid arthritis, systemic lupus erythematosus and progressive systemic 
sclerosis. Patients with primary Sjogren's syndrome may have clinical signs 
such as rash, arthritis, pneumonitis and nephritis. Typical symptoms include 
burning eyes, dry mouth, stinging tongue, painful throat, swollen glands and 
dry vagina. Oral candidiasis (a fungus infection of the mouth) may also arise 
as a result of the absence of naturally occurring anti-yeast substances which 
are contained in saliva. Although Sjogren's syndrome is not life threatening, 
it can cause extreme discomfort. 

   The National Institutes of Health ("NIH") estimates that there are 
approximately two to four million people in the United States who suffer from 
Sjogren's syndrome. The Company believes that the incidence of Sjogren's 
syndrome worldwide is similar to its incidence in the United States. 

   Topical use of artificial tears is the prevailing treatment for the dry 
eye symptom of the disease. Artificial tears must be used on a regular basis. 
Intensive oral hygiene is prescribed to prevent progressive periodontal 
problems that may develop as a result of the disease. 

   
   The Company believes that oral IFN|ga therapy helps to relieve the dryness 
associated with Sjogren's syndrome and may effectively supplement or be used 
in lieu of existing treatments. In a study conducted by the Company from 
October 1994 to January 1996 at two universities, the Company found that oral 
IFN|ga therapy administered to Sjogren's syndrome patients led to increased 
saliva production in six of 14 patients. 
    

   The Company has filed and there is now in effect an IND for the use of 
oral IFN|ga to treat Sjogren's syndrome. The Company intends to spend 
approximately $4.5 million to conduct and evaluate additional clinical trials 
of the treatment during the next three years. 

   Oral Mucositis. Oral mucositis is a condition characterized by 
inflammation and sometimes ulcerations of the mucosal lining of the mouth. It 
is often associated with the use of chemotherapy or radiation therapy on 
cancer patients, and in many cases is a dose limiting factor for the 
chemotherapy treatment cancer patients receive. Current treatments for oral 
mucositis, including oral hygiene, topical agents and oral rinses, are 
generally ineffective. 

   The Company has filed and there is now in effect an IND for the use of 
oral IFN|ga to treat oral mucositis. The Company sponsored a Phase 1/Phase 2 
clinical trial at three oncology research centers. Seven out of ten patients 
experienced a clinically significant reduction in their oral mucositis when 
IFN|ga was given with particular chemotherapy compared to a previous cycle of 
chemotherapy without IFN|ga given to the same patients. The Company believes 
that in the United States approximately 400,000 patients per year will suffer 
from oral mucositis. The Company intends to spend approximately $3.8 million 
to conduct and evaluate additional clinical trials during the next three 
years. 

   Hepatitis. Hepatitis is a family of diseases in which inflammation of the 
liver occurs. The most common cause of hepatitis is viral infection by one of 
six distinct viruses. Two of the most common of such viruses are HBV and HCV. 

   Symptoms of acute hepatitis, regardless of which viral agent causes the 
illness, are similar and include fever, nausea, vomiting and jaundice. While 
acute viral hepatitis can be debilitating, it is seldom fatal or permanently 
disabling. However, HBV and HCV can result in a lifelong chronic state. This 
chronic condition is usu- 

                                      23 
<PAGE>

ally found in two forms. One form is a "chronic carrier" state in which the 
individual does not have the clinical signs of the disease but is infectious. 
A chronic carrier can spread the disease for years without being aware of it. 
The second chronic state is termed "chronic active hepatitis." In this 
condition, the person is both infectious and has mild to severe hepatitis 
symptoms. According to the World Health Organization ("WHO"), HBV chronically 
infects (including both carrier and active states) 300-400 million people 
worldwide. WHO lists HBV as the ninth leading cause of death, responsible for 
up to 2 million deaths each year. 

   Hepatitis B 

   HBV is transmitted through blood, blood products and sexual contact. About 
6-10% of patients infected with HBV become carriers and 5-8% of all HBV 
patients develop chronic disease. 

   Currently, the only effective and widely approved treatment for chronic 
HBV is IFN|ga administered parenterally in high doses three times per week for 
16 to 24 weeks. However, new parenteral IFN|ga treatment regimens last for up 
to 48 weeks. Fewer than 40% of HBV patients respond favorably to parenteral 
IFN|ga treatment. The therapy has been shown to be almost totally ineffective 
in carrier cases. 

   High dose parenteral IFN|ga therapy often results in adverse reactions, 
including fever, headache, muscular pain, anorexia, fatigue, chills, 
weakness, nausea, hair loss, depression and personality changes. Parenteral 
high- dose IFN|ga treatment is also costly. Moreover, its use requires the 
additional expense of syringes and needles, and necessitates close medical 
supervision. Some of the additional required medical expense is in the form 
of doctor visits and treatment for the adverse effects associated with the 
parenteral IFN|ga. While no specific cost estimates are available, the costs 
are substantial, especially in countries where the health system is already 
overburdened. 

   
   The Company believes that low dose oral IFN|ga therapy for chronic HBV might 
be as beneficial a treatment for the disease as, and will be more economical 
than, parenteral IFN. Up to 105 million chronic HBV patients may qualify for 
low dose oral IFN|ga therapy worldwide. 
    

   Since 1990, the Company has been involved in an open-labelled (non-placebo 
controlled) safety and efficacy study of oral IFN|ga therapy for chronic HBV 
patients conducted at two clinical centers in Poland. The therapy appears to 
have had as beneficial an effect in this patient population as parenteral 
IFN|ga and to have produced fewer adverse side effects. Care needs to be taken 
in the interpretation of the results of the study since it was not 
placebo-controlled. However, the data generated to date indicate that the low 
dose oral IFN|ga therapy would represent significant improvement over 
parenteral therapy because it is less toxic and less expensive. 

   The Company intends to spend approximately $800,000 to conduct and 
evaluate clinical trials of oral IFN|ga treatment in Mexico with the goal of 
obtaining regulatory approval for marketing in Mexico. The Company has 
designed a study to be conducted at a hepatitis treatment center in Mexico 
City, which the Company believes will require approximately two years to 
complete. The Company is seeking temporary approval to market IFN|ga for 
treatment of HBV in China while clinical testing is being conducted. The 
Company intends to seek permanent marketing approval in China for such 
treatment after clinical testing has been completed. 

   Hepatitis C 

   
   HCV is transmitted primarily through blood and blood products and, to a 
lesser extent, by sexual contact. However, in up to 40% of HCV cases, no 
source of infection can be identified. Symptoms of the acute phase of the 
disease are similar to HBV, though usually less severe, with fatigue being 
the most common complaint. Of individuals infected with HCV, 20-30% will 
resolve their infection, 20-30% will become chronic carriers and the 
remaining 40-60% will develop chronic active hepatitis. The latter group is 
at great risk of developing cirrhosis and/or liver cancer. It is estimated 
that the number of chronic infections (including carriers) is 60 million 
worldwide, and the number is increasing rapidly. While infection via blood, 
blood products and sexual contact can be controlled to a certain extent, the 
20 to 40% of cases with an unknown method of transmission have resulted in 
great concern in the international health care community. Because HCV was not 
identified until 1989, the full extent of the epidemic is still unknown. 
    

   As with HBV, parenterally administered IFN|ga is the only widely approved 
therapy for HCV infection. Current therapy consists of high dosages of IFN|ga 
that are administered by injection three times per week for 24 

                                      24 
<PAGE>

weeks. Relapse after parenteral IFN|ga administration is common in HCV 
patients. Of the 30-50% of patients who initially respond to treatment, about 
half will revert to active disease, leaving only 15-25% of treated patients 
who experience a lasting benefit from therapy. Parenteral IFN|ga treatment of 
HCV is associated with the same high cost and adverse side effects attendant 
to such therapy for HBV. Costs can be even greater in treating HCV since 
patients who fail to respond to parenteral IFN|ga therapy or who relapse after 
therapy often receive multiple treatment courses, sometimes consisting of 
even greater doses and/or duration, in an attempt to forestall the frequently 
life-threatening consequences of long-term chronic HCV. 

   
   Recent clinical pilot work completed by the Company in association with a 
university in Canada indicates that chronic HCV patients treated with 
low-dose oral IFN|ga followed by a standard course of parenteral IFN|ga had an 
initial response rate twice that recorded in patients given parenteral IFN|ga 
alone. HBL has provided the Company with data that demonstrates that HCV 
patients in Japan who were treated with injectable IFN|ga preceded by low-dose 
oral IFN|ga experienced a greater than expected sustained rate of response. It 
should be noted that these data were generated from open-label treatment and 
should be interpreted accordingly. The Company has licensed such technology 
from the Canadian university and intends to use approximately $2,000,000, to 
prepare an Investigational New Drug submission in Canada and a similar 
application in Mexico, and, if such applications are approved, to conduct 
clinical trials in such countries to evaluate, and thereafter develop, oral 
IFN|ga pre-treatment as a means of increasing the effectiveness of parenteral 
IFN|ga therapy. An estimated 40 million worldwide chronic cases of HCV are 
believed to be candidates for this treatment. 
    

   Other Applications and Products. The Company has also filed and there are 
currently in effect INDs for the use of oral IFN|ga to treat aphthous 
stomatitis, fibromyalgia, the common cold and chronic fatigue syndrome in 
humans. However, the Company does not currently have, nor does it believe 
that in the foreseeable future it will have, the financial or human resources 
to actively pursue research and development activities with respect to these 
or other diseases or conditions. Any such additional activities would require 
arrangements to be made with strategic partners. There can be no assurance 
that any such development would occur. 

   In April 1996, the NIH announced that it will be conducting a clinical 
trial of the use of low dose oral IFN|ga therapy for the treatment of 
AIDS-related symptoms. The study will enroll 560 AIDS patients and test three 
different forms of IFN|ga , including the form produced by HBL as well as forms 
produced by two licensees of the Company. While the Company has filed an IND 
for the use of oral IFN|ga to treat AIDS, and assisted the NIH in the 
finalization of the study protocol as well as the coordination of the 
packaging of clinical supplies for the study, the Company currently plans 
only limited further development work for this indication until the NIH study 
has been completed. The extent of further development work undertaken by the 
Company may depend upon the results of the NIH study. 

   The Company is currently testing IFN|ga in ointment form for the treatment 
of genital warts. A pilot study has been conducted in Mexico on eight 
volunteers. The Company is also conducting laboratory tests on the product at 
an American university. 

ANIMAL HEALTH 

   
   The 1996 American Veterinary Medical Association Membership Directory and 
Resource Manual reports that there are approximately 52 million dogs in 34 
million households and 57 million cats in 29 million households in the United 
States. The United States Department of Agriculture estimates that the total 
number of cattle in the United States at the end of last year was 103 
million. 
    

   While the Company does not currently intend to devote significant 
financial or human resources to animal health, it is testing oral IFN|ga as a 
treatment for keratoconjunctivitis sicca ("KCS") in dogs, feline 
herpesvirus-1 infection ("FVR") in cats and shipping fever and mastitis in 
cattle. 

   KCS. KCS occurs whenever there is decreased production of tears or 
increased evaporation or break-up of the tear film. The disease is most 
common in dogs but occasionally occurs in cats and horses. Current treatment 
for the condition involves stimulation of tear production by a topical 
administration of cyclosporine formulation, topical applications or oral 
administration of antibiotics and use of artificial tear solutions. The 
Company has conducted a pilot study in which low dose oral IFN|ga resulted in 
significantly increased tear production in dogs. 

                                      25 
<PAGE>

   FVR. Veterinarians can trace 80 to 90% of all feline upper-respiratory 
tract infections to two known viruses. Although both viruses cause similar 
clinical effects, FVR (also known as feline viral rhinotracheitis) usually 
causes a more severe illness. A cat suffering from infection by the virus may 
sneeze frequently, become lethargic, salivate excessively and lose its 
appetite. Some cats also develop conjunctivitis and in some cases, pneumonia. 
In a pilot study on the use of oral IFN|ga in the treatment of FVR conducted by 
the Company at an American university in 1995, cats given IFN|ga for only two 
days had a significant benefit over cats given a placebo in terms of reduced 
nasal discharges, reduced fever and other clinical variables. 

   Shipping Fever. The term "shipping fever" is used to describe the bovine 
respiratory disease complex observed in cattle after shipment either into 
feedlots or onto pasture. Affected cattle experience fever, loss of appetite, 
cough, nasal discharge and irregular breathing. In studies conducted by Dr. 
Cummins at an American university from 1982 to 1988, human IFN|ga given orally 
to calves was found to provide significant reduction in fever, improvement in 
feed intake, and a decrease in mortality. The Company has filed an INAD and 
intends to conduct clinical trials with respect to use of oral IFN|ga as a 
treatment for shipping fever when a development partner is found. 

   Mastitis. The inflammation of the mammary gland in dairy cows is the most 
important and costly disease in the dairy industry. Ajinomoto Co., Inc. of 
Tokyo, Japan has agreed to conduct a pilot study, at its sole expense, on the 
use of low dose oral IFN|ga as a treatment for mastitis. 

   
   Development Agreement for Animal Health Products. In May 1996, the Company 
entered into an agreement with Virbac S.A., a manufacturer and distributor of 
pharmaceuticals and biologics for animals ("Virbac"), pursuant to which it 
granted to Virbac an exclusive worldwide license, except in Japan, to use the 
Company's patents and technology for development and sale of oral IFN|ga for 
dog and cat applications. Under the agreement the Company will work with 
Virbac, at Virbac's expense, to achieve regulatory approvals for such 
applications. The Company will also supply bulk IFN|ga to Virbac for the 
manufacture, formulation, testing and marketing of oral dosage forms of 
licensed products by Virbac and Virbac will pay the Company for such IFN|ga at 
specified rates. Virbac will also pay to the Company certain additional fees 
and reimbursements. 
    

STRATEGIC ALLIANCE WITH HBL 

   HBL was established in 1970 to engage in biotechnical research and 
development. It is a subsidiary of Hayashibara Company Ltd., a 
privately-owned Japanese holding corporation with diversified subsidiaries. 
For more than 100 years the Hayashibara Company, Ltd. and its predecessors 
have been applying microbiological technology in the starch industry for the 
production of maltose and other sugars. 

   
   In 1981, HBL established the Fujisaki Institute to accelerate development 
of industrial methods for the production of biologics and to sponsor clinical 
trials for such products. In 1985, HBL built the Fujisaki Cell Center to 
support basic research. In 1987, HBL successfully accomplished the mass 
production of human cells in an animal host by producing human cells in 
hamsters. This made it possible to economically produce a natural form of 
human IFN|ga and other biologics. HBL also has developed and obtained patents 
for technology relating to the production of IFN|ga - containing lozenges by 
which the stability of the IFN|ga activity can be maintained for up to 18 
months at room temperature and up to three years if the product is 
refrigerated. The Company believes that the use of such lozenges gives it 
advantages over competitive technologies in terms of cost, taste and ease of 
handling. 

   In 1989, the Company and HBL entered into a manufacturing and supply 
agreement pursuant to which HBL granted the Company a license to use and 
distribute HBL IFN|ga and committed to supply to the Company its requirements 
of HBL IFN|ga and the Company agreed to pay HBL perpetual royalties on net 
sales of products containing IFN|ga (whether supplied by HBL or others) along 
with certain fees for the sublicensing of the Company's rights. In March 
1992, HBL and the Company terminated the 1989 agreement and entered into a 
Joint Development and Manufacturing/Supply Agreement (the "Development 
Agreement") pursuant to which HBL agreed to supply to the Company HBL IFN|ga 
and granted to the Company an exclusive license to market (with the right to 
sublicense such rights to others, subject to HBL's approval of the 
sublicensees) HBL IFN|ga for low dosage oral use in humans worldwide, except in 
Japan (where HBL has retained exclusive marketing rights), and 
    

                                      26 
<PAGE>

   
for low dosage oral use in animals worldwide. 

   Subject to certain conditions, HBL also agreed to provide to the Company 
$9,000,000 in research funding. All of such funding was provided to the 
Company during the three years ended December 31, 1994 and has been expended. 
The Company also increased HBL's perpetual royalties on net sales by the 
Company of IFN|ga- containing products for oral use. 

   Under the Development Agreement, the Company has granted to HBL an 
exclusive license to use the Company's technology and certain of its patents 
for the marketing of HBL IFN|ga for oral use in humans in Japan and HBL agreed 
to pay to the Company perpetual royalties on net sales of HBL IFN|ga for oral 
use by humans in Japan by HBL, its affiliates and licensees. The initial term 
of the Development Agreement expires in March 1999, but the agreement is 
automatically renewable for successive three year terms subject to the prior 
written agreement of the parties. 

   In January 1993, the Company entered into a license agreement with HBL 
pursuant to which it granted a license to HBL for the marketing by HBL of HBL 
IFN|ga for oral use in animals in Japan in exchange for HBL's agreement to pay 
royalties on net sales of the product for such use in Japan by HBL, its 
affiliates and licensees. Such agreement terminates in January 2000 but is 
automatically renewable for successive three year terms subject to the prior 
written agreement of the parties. 

   In June 1994, the Company and HBL entered into a Manufacturing/Supply 
Agreement under which HBL granted to the Company an exclusive license to use, 
formulate, test and market HBL IFN|ga for non-oral (topical or parenteral) use 
in both humans and animals in North America and HBL agreed to supply to the 
Company its IFN|ga for such purposes. Under the agreement the Company agreed to 
pay to HBL a specified price for the HBL IFN|ga it purchases for non-oral use. 
    

AGREEMENTS WITH ISI AND OTHERS 

   
   In October 1989, the Company entered into a Manufacturing and Supply 
Agreement with ISI, under which ISI granted to the Company an exclusive 
worldwide license to market ISI IFN|ga for oral use in animals and agreed to 
supply ISI IFN|ga for such use exclusively to the Company. Pursuant to the 
agreement, ISI receives a specified price for ISI IFN|ga sold to the Company. 
ISI is also entitled to receive royalties on net sales as well as a 
percentage of any license fee, option fee or other payment, except royalty or 
specific research or patent expense reimbursements, which the Company 
receives for the assignment or sublicense of the Company's rights under the 
license agreement. 
    

   Since 1994, the Company has been required to expend a minimum of $50,000 
per year toward development of products under the Manufacturing and Supply 
Agreement in order to keep it in force. The Company has done so, and 
currently intends to continue to make such expenditures. The Manufacturing 
and Supply Agreement will continue for seven years after the Company's first 
purchase order for Manufactured Products under the Agreement, and will be 
automatically renewed for successive three-year terms thereafter, subject to 
termination by the Company, with or without cause, and subject to termination 
by ISI at any time after the first renewal term, if net sales for a calendar 
year do not exceed $100,000. The seven-year term has not yet commenced, since 
the Company has not yet placed an order with ISI for Manufactured Products. 
"Manufactured Products" is defined in the agreement as ISI IFN|ga, packaged in 
accordance with FDA approved dosage forms. The FDA has not yet approved any 
dosage form within the meaning of the agreement. 

   In October 1989, the Company and ISI entered into a license agreement 
pursuant to which the Company granted to ISI a license (co-exclusive with the 
Company) of the Company's patented technology for the use and sale of IFN|ga - 
containing products for use in humans worldwide, except for Japan (where the 
Company has granted to HBL an exclusive license), for a royalty on net sales 
of licensed products made during the term of the agreement. The original term 
of the license agreement was to expire on October 20, 1994, but ISI extended 
its term as therein permitted. As amended in April 1995, the agreement will 
continue in force for the life of the licensed patents, subject only to ISI's 
right to terminate the agreement with or without cause (in which case ISI 
must cease any use or sale of the licensed products), and the Company's right 
to terminate for breach of the agreement by ISI, or upon certain other 
events. 

                                      27 
<PAGE>

   In April 1995, in connection with the settlement of certain patent and 
infringement litigation brought by the Company in New Zealand against Fernz 
Corporation Limited, Pharma Pacific Management Pty. Ltd. ("PPM") and certain 
other companies and certain opposition proceedings brought by PPM against the 
Company and certain of the Company's licensors in Australia and Europe, the 
Company entered into a non-exclusive license agreement with PPM. Pursuant to 
such agreement, the Company licenses to PPM worldwide, except in Japan, the 
right to use the Company's patented technology for the use and sale of IFN|ga - 
containing products in humans and PPM is obligated to pay the Company a 
royalty based on sales of the product in countries where any of the licensed 
patents has issued. To the Company's knowledge, PPM is not selling products 
covered by the license in any such country. PPM also paid to the Company 
$500,000 as a reimbursement of a portion of the Company's research and 
expenses related to the licensed technology and a $50,000 license fee to be 
credited against future royalties. In connection with the settlement, ISI and 
the Company agreed to an amendment of ISI's license from the Company to 
prohibit any sublicensing by ISI of the licensed technology (except that ISI 
retained the right to sublicense such technology in connection with the use 
and sale of ISI IFN|ga products) and the Company purchased, for $625,000, 
312,500 shares of the Common Stock of ISI, a public company. 

MANUFACTURING 

   The Company depends on HBL and ISI for the production and purification of
IFN|ga for use in clinical trials and intends to rely on them to supply it with
IFN|ga in bulk for formulation in products commercially sold by the Company. HBL
produces all of its IFN|ga (including injectable IFN|ga and IFN|ga formulated in
lozenges) at its Kibi Pharmaceutical Plant outside Okayama, Japan. The plant has
not yet been approved by the FDA for production of IFN|ga . ISI produces all of
its IFN|ga at an FDA-approved plant in New Brunswick, New Jersey. The Company
uses ISI IFN|ga for oral administration in animal testing.

MARKETING AND SALES 

   The Company anticipates that its products eventually will be marketed in 
all countries where approval to sell such products is obtained. The Company 
expects to sell products for human use to pharmaceutical distributors who 
will undertake the marketing of human products. It hopes to sell the products 
for animal use to animal health distributors who will undertake the marketing 
of the products. However, the Company does not expect that it will have 
significant sales for at least three years. 

   
   In November 1990, the Company entered into an agreement (the "Marketing 
Agreement") with Mitsubishi Corporation ("Mitsubishi") under which it has 
appointed Mitsubishi its marketing representative for the Company's low-dose 
oral IFN|ga products for human use. The agreement is exclusive worldwide, 
except for the United States, Japan, Thailand and certain countries in 
Africa. Pursuant to the Marketing Agreement, Mitsubishi is assisting the 
Company in developing a global marketing strategy. Mitsubishi will also 
identify and negotiate with potential licensees where the Company determines 
that licensing is the most effective method of commercializing a product; 
establish distribution channels for such products, if any, that may be 
produced under the Company's own auspices; arrange for shipment and delivery 
of products to licensees, distributors and customers; and assist the Company 
in obtaining regulatory approval for the Company's products. For its 
services, Mitsubishi will receive stated percentages of all license or option 
fees and stated percentages of any royalties paid to the Company under any 
license agreements entered into by the Company in Mitsubishi's exclusive 
market area during the term of the Marketing Agreement or any license 
agreement entered into within two years after the term with licensees 
contacted by Mitsubishi or introduced to the Company by Mitsubishi prior to 
the expiration of the Marketing Agreement. In addition, Mitsubishi is 
entitled to a percentage commission on the net sales value (as defined in the 
agreement) of products shipped to any person in Mitsubishi's exclusive 
marketing area during the same periods discussed above with respect to 
licenses. The initial term of the Marketing Agreement expires in November 
2000, but the term shall automatically be extended for successive three year 
periods unless either party elects not to extend the agreement by written 
notice to the other not less than 12 months prior to the end of the term or 
renewal term. 
    

                                      28 
<PAGE>

PATENTS AND PROPRIETARY RIGHTS 

   The Company seeks patent protection for its technology and products. It 
typically files United States patent applications and related foreign patent 
applications as soon as such technology and products are developed. The 
Company files foreign patent applications on some of its technology and 
products in countries where, in the Company's opinion, business 
considerations warrant such filings. The foreign countries in which the 
Company files patent applications usually include Japan, Canada, Australia, 
and countries of the European Economic Community. 

   
   The Company owns two United States patents which expire in 2008 and 2010 
and licenses from HBL and two universities or their affiliates, a total of 
nine United States patents which expire on various dates between 2001 and 
2014. The Company's licensors have eight United States patent applications 
pending relating to oral IFN|ga. Numerous foreign patent applications which 
correspond to certain of these United States patent applications have also 
been filed and are pending. Although the patent examiner has initially 
rejected all claims in seven of the pending United States patent 
applications, the Company's licensors are prosecuting the applications to 
counter the rejections, with the goal of patent grants. There can be no 
assurance, however, that the Company's licensors' existing patent 
applications will mature into issued patents, or, if issued, that such 
patents will be adequate to protect the Company's products or processes. In 
addition, there can be no assurance that the Company will be able to obtain 
any necessary or desired additional licenses to patents or technologies of 
others or that the Company will be able to develop its own additional 
patentable technologies. 
    

   The Company's license agreements with its licensors provide for the 
payment to licensors of various license issue fees, percentage royalties on 
net sales of licensed products by the Company (including certain minimum 
annual royalties) and stated percentages of license, option or other front- 
end payments and royalty payments received by the Company from sublicensees. 
The Company's licenses extend for the life of the licensed patents, subject 
to earlier termination without cause by the Company or with cause by 
licensors. 

   
   The Company believes that the patent position of pharmaceutical companies 
involves complex legal and factual questions. There can be no assurance that 
any future patent applications or any patents issued to the Company will 
provide it with competitive advantages or that the Company's use of its 
technology will not be challenged as infringing upon the patents or 
proprietary rights of others, or that the patents or proprietary rights of 
others will not have an adverse effect on the ability of the Company to do 
business. Furthermore, there can be no assurance that others will not 
independently develop similar technology or that others will not design 
technology to circumvent the Company's existing or future patents or 
proprietary rights. In the event that the Company's technology were deemed to 
be infringing upon the rights of others, the Company could be subject to 
damages or enjoined from using such technology or the Company could be 
required to obtain licenses to utilize such technology. No assurance can be 
given that any such licenses would be made available on terms acceptable to 
the Company, or at all. If the Company were to be unable to obtain such 
licenses, it could encounter significant delays in introducing products to 
the market while it attempts to design around the patents or rights infringed 
upon, or the Company's development, manufacture and sale of products 
requiring such licenses could be foreclosed. In addition, the Company could 
experience a loss of revenues and may incur substantial costs in defending 
itself and indemnifying its strategic partners in patent infringement or 
other actions based on proprietary rights violations brought against it or 
its strategic partners. The Company could also incur substantial costs in the 
event it finds it necessary to assert claims against third parties to prevent 
the infringement of its patents and proprietary rights by others. 

   Roche has asserted to both HBL and ISI that the manufacture, sale and use 
of their respective forms of IFN|ga infringe United States Patent 4,503,035 and 
foreign counterparts thereof owned by Roche relating to IFN|ga (collectively, 
the "Roche Patent"). The Roche Patent expires in March 2002 in the United 
States and at various times in other jurisdictions. HBL has informed the 
Company that it believes that the claims of the Roche Patent are not 
applicable to the manufacture and sale of HBL IFN|ga. HBL has prevailed at the 
trial level in litigation initiated by Roche in Japan concerning the dispute 
and Roche has appealed the decision. The Company is not a party to the 
litigation between Roche and HBL in Japan. 
    

                                      29 
<PAGE>

   The Company believes that it is likely that Roche would commence suit 
against the Company if the Company were to sell or attempt to sell HBL IFN|ga 
for commercial use in the United States or any other country where the Roche 
Patent has issued with IFN|ga composition claims and is still in effect. 
However, under applicable United States patent law, the use of a patented 
product solely for uses reasonably related to the development and submission 
of information for seeking FDA approval of a biologic for indicated uses in 
humans is not an act of infringement. Thus, the Company believes that it is 
unlikely that it would be sued by Roche prior to commercialization of the 
Company's IFN|ga products. Roche would also not assert infringement claims with 
respect to the Company's sale of ISI IFN|ga, because in March 1995 ISI entered 
into a license agreement with Roche pursuant to which ISI was granted a 
license to use the Roche Patent in exchange for specified royalties. 

   The Company believes that its oral IFN|ga dosage forms do not infringe any 
claims of the Roche Patent. However, there can be no assurance that, if the 
Company sells or attempts to sell HBL IFN|ga for commercial use in one or more 
countries in which the Roche Patent has issued, such sale or attempted sale 
would not be determined to be an infringement of the Roche Patent under 
applicable law. HBL has agreed to indemnify the Company for litigation 
expenses incurred in defending suits brought by Roche against the Company for 
infringement of the Roche Patent and for any damages the Company may be 
required to pay to Roche in the event that Roche is successful in any such 
suit. Nevertheless, a determination of infringement could have a material 
adverse effect on the business and operations of the Company. See "Certain 
Transactions." 

   
   In response to patent infringement claims made by the Company against PPM 
and certain other persons, PPM contested the validity of granted claims of 
certain Company-licensed patents in Australia, New Zealand and Europe. In 
addition, a former employee of the Company contested the validity of one of 
the United States patents licensed by the Company. All of the disputes were 
settled or dismissed without final resolution of the patent validity issues. 
However, in connection with the settlement of the litigation with PPM, the 
Company granted to PPM a non-exclusive royalty-bearing license to use the 
patented technology worldwide, except in Japan. See "-- Agreements with ISI 
and Others." 

   The Company relies on proprietary know-how and confidential information 
and employs various methods, such as entering into confidentiality and 
noncompete agreements with its current employees and with third parties to 
whom it has divulged proprietary information, to protect the processes, 
concepts, ideas and documentation associated with its technologies. Such 
methods may afford incomplete protection and there can be no assurance that 
the Company will be able to protect adequately its trade secrets or that 
other companies will not acquire information which the Company considers to 
be proprietary. The Company will be materially adversely affected if it 
cannot maintain its proprietary technologies. 
    

COMPETITION 

   
   The pharmaceutical industry is an expanding and rapidly changing industry 
characterized by intense competition. The Company believes that its ability 
to compete will be dependent in large part upon its ability to continually 
enhance and improve its products and technologies. In order to do so, the 
Company must effectively utilize and expand its research and development 
capabilities and, once developed, expeditiously convert new technology into 
products and processes which can be commercialized. Competition is based 
primarily on scientific and technological superiority, technical support, 
availability of patent protection, access to adequate capital, the ability to 
develop, acquire and market products and processes successfully, the ability 
to obtain governmental approvals and the ability to serve the particular 
needs of commercial customers. Corporations and institutions with greater 
resources than the Company may, therefore, have a significant competitive 
advantage. The Company's potential competitors include entities that develop 
and produce therapeutic agents for treatment of human and animal disease. 
These include numerous public and private academic and research organizations 
and pharmaceutical and biotechnology companies pursuing production of, among 
other things, biologics from cell cultures, genetically engineered drugs and 
natural and chemically synthesized drugs. Almost all of these potential 
competitors have substantially greater capital resources, research and 
development capabilities, manufacturing and marketing resources and 
experience than the Company. The Company's competitors may succeed in 
developing products or processes that are more effective or less costly than 
any that may be developed by the Company, or that gain regulatory approval 
prior to the Company's products. The Company also expects that the number of 
its competitors and potential competitors will increase as more IFN|ga products 
receive commercial 
    

                                      30 
<PAGE>

marketing approvals from the FDA or analogous foreign regulatory agencies. 
Any of these competitors may be more successful than the Company in 
manufacturing, marketing and distributing its products. There can be no 
assurance that the Company will be able to compete successfully. 

GOVERNMENT REGULATION 

   The Company's research and development activities are subject to 
comprehensive regulation by numerous governmental authorities in the United 
States and other countries. If the Company is able to produce and market 
products, such production and marketing will place the Company under 
continued regulation. Among the applicable regulations in the United States, 
pharmaceutical products are subject to the Federal Food, Drug and Cosmetic 
Act, the Public Health Service Act, other federal statutes and regulations, 
and certain state and local regulations. These statutes and regulations 
govern the development, testing, formulation, manufacture, labeling, storage, 
record keeping, quality control, advertising, promotion, sale, distribution 
and approval of pharmaceutical products. Failure to comply with applicable 
requirements can result in fines, recall or seizure of products, total or 
partial suspension of production, refusal by the government to approve 
marketing of the product and criminal prosecution. 

   A new drug may not be legally marketed for commercial use in the United 
States without FDA approval. In addition, upon approval, a drug may only be 
marketed for the indications, in the formulations and at the dosage levels 
approved by the FDA. The FDA also has the authority to withdraw approval of 
drugs in accordance with applicable statutes and regulations. Analogous 
foreign regulators impose similar approval requirements relating to 
commercial marketing of a drug in their respective countries and may impose 
similar restrictions and limitations after approval. 

   In order to obtain FDA approval of a new product, the Company and its 
strategic partners, if any, must submit proof of safety, efficacy, purity, 
and stability, and the Company must demonstrate validation of its 
manufacturing process. The testing and application process is expensive and 
time consuming, often taking years to complete. There is no assurance that 
the FDA will act favorably or quickly in reviewing applications. With respect 
to patented products, processes or technologies, delays imposed or caused by 
the governmental approval process may materially reduce the period during 
which the Company will have the exclusive right to exploit them. Delays could 
also affect the commercial advantages derived from proprietary processes. 
There is no assurance that the regulatory agencies will find present or 
future submissions of the Company to be adequate. 

   The FDA approval process for a pharmaceutical product such as oral IFN|ga 
includes review of (i) preclinical laboratory and animal studies to enable 
FDA review of an Investigational New Drug Application ("IND") or 
Investigational New Animal Drug Notice ("INAD"), (ii) initial clinical 
studies to define safety and dose parameters and (iii) well-controlled 
clinical trials to demonstrate product efficacy and safety, followed by 
submission and FDA approval of a Product License Application ("PLA") 
concerning biologics and a New Drug Application ("NDA") with respect to 
drugs. FDA approval of the NDA and/or PLA is required prior to any commercial 
sale or shipment of the product, except as to certain exports. 

   Preclinical studies involve laboratory evaluation of product 
characteristics and animal studies to assess the safety of the product. The 
results of the preclinical tests are submitted to the FDA as part of the IND 
or INAD application and are reviewed by the FDA. Unless the FDA objects to an 
IND, the application will become effective 30 days following its receipt by 
the FDA. INADs need only be filed prior to the shipment of the drug or 
biologic for testing. There can be no certainty that the FDA will not object 
to the commencement of clinical studies concerning any drug or biologic. 

   Human clinical trials are typically conducted in three sequential phases 
with some amount of overlap allowed. Phase 1 trials normally consist of 
testing the product in a small number of patient volunteers for establishing 
safety (adverse effects), dosage tolerance, metabolism, distribution, 
excretion and clinical pharmacology. In Phase 2, the continued safety and 
initial efficacy of the product are evaluated in a somewhat larger patient 
population, and appropriate dosage amounts and treatment intervals are 
determined. Phase 3 trials typically involve more definitive testing of the 
appropriate dose for safety and clinical efficacy in an expanded patient 
population at multiple clinical testing centers. A clinical plan, or 
"protocol," accompanied by the approval of the institution participating in 
the trials, must be submitted to the FDA prior to commencement of each 
clinical trial. 

                                      31 
<PAGE>

Each clinical study must be conducted under the auspices of an Institutional 
Review Board ("IRB") at the institution performing the clinical study. An IRB 
may require changes in a protocol, and there can be no assurance that an IRB 
will permit any given study to be initiated or completed. In addition, the 
FDA may order the temporary or permanent discontinuation of clinical trials 
at any time. In light of this process, the Company must necessarily rely on 
other persons and institutions to conduct studies. The Company cannot 
guarantee that such persons and institutions will conduct studies properly. 
There also can be no assurance that Phase 1, Phase 2 and Phase 3 testing of 
the Company's products will be completed successfully within any specified 
time period, if at all. 

   All the results of the preclinical and clinical studies on a 
pharmaceutical product are submitted to the FDA in the form of a PLA or NDA, 
for approval to commence commercial distribution. Submission of a PLA or NDA 
does not assure FDA approval for marketing. The application review process 
takes more than two years on average to complete. However, the process may 
take substantially longer if the FDA has questions or concerns about a 
product or studies regarding the product. In general, the FDA requires at 
least two adequate and well-controlled clinical studies demonstrating 
efficacy with sufficient levels of statistical assurance. However, additional 
support may be required. The FDA also may request additional information 
relating to safety or efficacy, such as long- term toxicity studies. In 
responding to a PLA or NDA, the FDA may grant marketing approval, require 
additional testing and/or information or deny the application. Accordingly, 
there can be no assurance about any specific time frame for approval, if any, 
of products by the FDA. The FDA also may require post-marketing testing and 
surveillance to monitor the safety record of a product and its continued 
compliance with regulatory requirements. 

   
   The facilities of each pharmaceutical manufacturer must be registered with 
and approved by the FDA as compliant with the agency's good manufacturing 
practice regulations ("GMP"). For biologics, except certain 
well-characterized ones, this requires the filing of an establishment license 
application ("ELA") that must be approved by the FDA for the facility in 
which the product is maintained. While the ELA and PLA are separate 
documents, they must be submitted at the same time and both documents must be 
approved before the sale of the biologic. Continued registration also 
requires compliance with the FDA's GMP regulations. Products must be 
formulated in accordance with the FDA's GMP requirements and preclinical 
tests must be conducted by laboratories that comply with FDA regulations 
governing the testing of drugs in humans and animals. In order to comply with 
GMP, manufacturers must continue to expend time, money and effort in 
production, record keeping and quality control. In addition, manufacturers 
must comply with regulations promulgated by the United States Drug 
Enforcement Administration and similar state and local regulatory authorities 
if they handle controlled substances, and they must be registered with the 
United States Environmental Protection Agency and similar state and local 
regulatory authorities if they generate toxic or dangerous waste streams. 
Other regulatory agencies, such as the Occupational Safety and Health 
Administration, also monitor manufacturing facilities for compliance with 
workplace safety regulations. Each of these organizations conducts periodic 
establishment inspections to confirm continued compliance with its 
regulations. Failure to comply with any of these regulations could mean 
fines, interruption of production and even criminal prosecution. 
    

   For foreign markets, a pharmaceutical company is subject to regulatory 
requirements, review procedures and product approvals which, generally, may 
be as extensive, if not more extensive, as those in the United States. 
Although the technical descriptions of the clinical trials are different, the 
trials themselves are often substantially the same as those in the United 
States. Approval of a product by regulatory authorities of foreign countries 
must be obtained prior to commencing commercial product marketing in those 
countries, regardless of whether FDA approval has been obtained. The time and 
cost required to obtain market approvals in foreign countries may be greater 
than required for FDA approval and may be subject to delay. There can be no 
assurance that regulatory authorities of foreign countries will grant 
approval. 

RESEARCH AND DEVELOPMENT 

   
   During the years ended December 31, 1994 and 1995 and the three months 
ended March 31, 1996, the Company incurred expenses of $1,364,042, $875,093 
and $134,209, respectively, resulting from Company- sponsored research and 
development activities. Research and development is expected to remain a 
significant component of the Company's business. In the short term, the 
Company expects to concentrate on the Primary 
    

                                      32 
<PAGE>

Development Projects and intends to use approximately $6,350,000 of the 
estimated net proceeds of this offering and other funds, to the extent they 
are, or may become, available, for such projects. However, the Company may 
abandon or deemphasize its research and development activities with respect 
to the Primary Development Projects and expand research and development of 
other products as circumstances warrant. The Company has contracted out 
substantially all of its clinical research and intends to continue to do so 
while utilizing its staff for monitoring such research. 

PROPERTY 

   The Company's executive and administrative offices are located at 800 West 
9th Avenue, Amarillo, Texas in a 5,200 square foot facility owned by the 
Company. The building contains offices, meeting rooms and a biologic storage 
area. The Company believes that the facility is adequate for its present and 
anticipated uses. 

EMPLOYEES 

   The Company currently has eight full-time employees, three of whom are 
executive officers, three of whom assist in the design and monitoring of 
clinical trials and the conduct of regulatory affairs for such trials, and 
two of whom are clerical staff. The Company believes that its relations with 
its employees are good. None are covered by a collective bargaining agreement 
with the Company. 

                                      33 
<PAGE>

                                  MANAGEMENT 

DIRECTORS AND EXECUTIVE OFFICERS 

   The current directors and executive officers of the Company are as 
follows: 

<TABLE>
<CAPTION>
 Name                           Age     Position 
 -----------------------------   -----   ------------------------------------------- 
<S>                              <C>    <C>
Joseph Cummins, DVM, PhD (1) .    53    Chairman of the Board, President, 
                                        Chief Executive Officer and Director 
                                        Vice President--Finance and 
Charles Hughes  ..............    56    Administration, Chief Financial Officer 
Alan Richards, PhD  ..........    46    and Treasurer 
Edward L. Morris  ............    51    Director of Clinical and Regulatory Affairs 
Stephen Chen, PhD (2)  .......    47    Secretary 
James Cook (1)(3)  ...........    61    Director 
Katsuaki Hayashibara (2)  ....    52    Director 
Dennis Moore, DVM (1)(3)  ....    49    Director 
James Page, MD (2)  ..........    69    Director 
  Director 
</TABLE>

- ------ 
(1) Member of the Executive Committee. 
(2) Member of the Compensation Committee. 
(3) Member of the Audit Committee. 

   Joseph Cummins has been the Chairman of the Board of the Company since he 
founded it in June 1984. Dr. Cummins has also served as President of the 
Company since December 1994 and from June 1984 to September 1992. He received 
a PhD degree in veterinary microbiology from the University of Missouri in 
1978 and a doctor of veterinary medicine degree from Ohio State University in 
1966. Dr. Cummins has been conducting research concerning IFN since 1969. 

   Charles Hughes has been Vice President -- Finance and Administration, 
Chief Financial Officer and Treasurer of the Company since April 1993. From 
August 1991 to March 1993 he was a Vice President of First National Bank of 
Amarillo, and from July 1989 to July 1991 he was Vice President of Finance 
and Administration of the Cattlemen's Beef Promotion and Research Board, an 
industry organization. From September 1985 to July 1989, he was a financial 
consultant and from May 1979 to September 1985 he was the Chief Financial 
Officer of Friona Industries, Inc., a public company engaged in agribusiness. 
Mr. Hughes is a certified public accountant. 

   Alan Richards has served the Company in various capacities since June 
1990, most recently as Director of Clinical and Regulatory Affairs. From 1986 
to 1990, Dr. Richards was a member of the faculty of Campbell University 
teaching microbiology, immunology, genetics and biotechnology. He received a 
PhD degree in veterinary microbiology and immunology from Texas A&M 
University in 1984. 

   Edward Morris has served as Secretary of the Company since 1986. Since 
1983, Mr. Morris has been a partner in the law firm of Morris, Moore, Moss & 
Douglass, P.C., which firm provides legal services to the Company. 

   Stephen Chen has been a director of the Company since February 1996. He 
has been President and Chief Executive Officer of STC International, Inc., a 
healthcare investment firm, since May 1992. From August 1989 to May 1992 he 
was Director of Pharmaceutical Research and Development for the Ciba Consumer 
Pharmaceuticals Division of Ciba-Geigy. 

   James Cook has been a director of the Company since 1988. He has been the 
President and Chief Executive Officer of the First National Bank of Arvada 
since January 1992 and from April 1987 to December 1991 he was Executive Vice 
President of First National Bank of Amarillo. 

   Katsuaki Hayashibara has been a director of the Company since 1994. Since 
1988, Mr. Hayashibara has been the Director of Research and Development for 
HBL. 

                                      34 
<PAGE>

   Dennis Moore has been a director of the Company since 1986. Dr. Moore has 
been a doctor of veterinary medicine since 1972 and was in private practice 
from 1972 to 1995. 

   James Page has been a director of the Company since February 1996. Prior 
to retiring in 1991 as a Vice President with Adria Laboratories, Inc., a 
pharmaceutical company specializing in therapy given to cancer and AIDS 
patients, Dr. Page held various upper management level positions with Carter 
Wallace, Inc., Merck Sharpe & Dohme Research Laboratories and Wyeth 
Laboratories. 

   The Company's directors are elected at the annual meeting of shareholders 
to hold office until the annual meeting of shareholders for the ensuing year 
or until their successors have been duly elected and qualified. The Company 
pays directors who are not employees of the Company a fee of $1,000 per 
regularly scheduled Board meeting attended (or $250 for participation in a 
regularly scheduled Board meeting by conference telephone). The Company 
reimburses all directors for their expenses in connection with their 
attendance at such meetings. 

   Officers are elected annually by the Board of Directors and serve at the 
discretion of the Board. 

   The Company has agreed, for a period of five years from the date of this 
Prospectus, if so requested by the Underwriter, to nominate and use its best 
efforts to elect a designee of the Underwriter as a director of the Company 
or, at the Underwriter's option, as a non-voting advisor to the Company's 
Board of Directors. The Company's officers and directors and substantially 
all of its existing shareholders have agreed to vote their shares of Common 
Stock in favor of such designee. The Underwriter has not yet exercised its 
right to designate such a person. 

   The Company is the owner and beneficiary of a $2,000,000 insurance policy 
on the life of Dr. Joseph Cummins. 

EXECUTIVE COMPENSATION 

   The following table sets forth for the three years ended December 31, 1995 
compensation paid by the Company to its Chairman of the Board, President and 
Chief Executive Officer. None of the Company's other executive officers had 
annual compensation in excess of $100,000 for services rendered during any of 
the three years ended December 31, 1995. 

                          SUMMARY COMPENSATION TABLE 

<TABLE>
<CAPTION>
                                                   Annual Compensation 
                                        --------------------------------------- 
                                                                  Other Annual 
                                                                  Compensation 
Name and Principal Position      Year    Salary($)    Bonus($)         ($) 
 ----------------------------   ------   ----------    --------   -------------- 
<S>                             <C>     <C>           <C>         <C>
Dr. Joseph Cummins, Chairman 
  of the Board, President and 
  Chief Executive Officer ...    1995     $120,000     $   500      $      -- 
                                 1994      120,000          --             -- 
                                 1993      120,000      27,308       30,000(1) 
</TABLE>

- ------ 
(1) Represents the amount allocated to Mr. Cummins of contributions made by 
    the Company to employees under the Company's Profit Sharing Plan which 
    was discontinued in 1995. 

EMPLOYMENT AGREEMENTS 

   Joseph Cummins, the Chairman of the Board, President and Chief Executive 
Officer of the Company, is employed under an employment agreement entered 
into by the parties in March 1994, as amended in May 1996. As amended, the 
agreement provides for a term expiring on December 31, 1999. Pursuant to the 
agreement Dr. Cummins is required to devote his full time to the affairs of 
the Company and receives an annual salary of $120,000. The agreement also 
contains provisions (i) prohibiting disclosure of confidential information, 
(ii) granting to the Company rights to intellectual property developed by Dr. 
Cummins that relate to the Company's business and are developed in the course 
of his employment by the Company, and (iii) prohibiting competition with the 
Company during, and for a period of three years after, Dr. Cummins' 
employment by the Company. The employment agreement also sets forth the 
amended terms of a restricted stock grant awarded to Dr. Cum- 

                                      35 
<PAGE>

mins by the Company. In accordance with and in full satisfaction of such 
terms, simultaneously with the sale of the Common Stock offered hereby, the 
Company will issue to Dr. Cummins 30,000 shares of Common Stock and use 
$90,000 to satisfy withholding tax obligations arising as a result of such 
issuance. See "Certain Transactions." 

   Alan Richards, the Company's Director of Clinical and Regulatory Affairs, 
and Charles Hughes, its Vice President - Finance and Administration and Chief 
Financial Officer, respectively, are employed pursuant to employment 
agreements entered into in March 1994 and June 1994, respectively. Pursuant 
to the agreements, Dr. Richards and Mr. Hughes each is required to devote his 
full time to the affairs of the Company and receive annual salaries of 
$87,500 and $74,000, respectively. The employment agreements contain the same 
provisions regarding confidentiality, non-competition and ownership of 
intellectual property rights as contained in Dr. Cummins' employment 
agreement. The employment agreements were amended in May 1996 to modify the 
terms of certain restricted stock grants previously awarded to the employees. 
In accordance with and in full satisfaction of the amended terms of the 
restricted stock grants, simultaneously with the sale of the Common Stock 
offered hereby, the Company will issue 30,000 and 19,000 shares of Common 
Stock, respectively, to Dr. Richards and Mr. Hughes and use an aggregate of 
$145,000 to satisfy withholding tax obligations relating to such issuances. 
Each employment agreement is for an indefinite term, but is terminable by 
either party upon six months prior written notice to the other. See "Certain 
Transactions." 

   For a period of three years after the date of this Prospectus, the Company 
may not, without the prior written consent of the Underwriter, increase the 
compensation of Messrs. Cummins, Richards or Hughes. Such approval shall be 
predicated upon, among other things, the performance of the Company, the 
performance of the employee, inflationary trends and other economic 
conditions. 

SCIENTIFIC ADVISORY BOARD 

   The Company's Scientific Advisory Board (the "Advisory Board") was 
organized to review and evaluate the Company's research and development 
programs and to advise the Company generally in addressing various scientific 
issues. The Company generally selects for membership persons who are experts 
in infectious diseases. Members of the Advisory Board ("Advisors") may meet 
as a group or individually with management of the Company. They are not 
employed by the Company and may have commitments to, or consulting or 
advisory agreements with, other entities that may limit their availability to 
the Company. These entities may also be competitors of the Company. The 
Company is not aware of any conflict of interest between work performed by 
Advisors on behalf of the Company and work performed by them on behalf of 
other parties. The Company requires each Advisor to execute a confidentiality 
agreement upon the commencement of his or her relationship with the Company. 
The agreements generally provide that all confidential information made known 
to the individual during the term of the relationship is the exclusive 
property of the Company and shall be kept confidential and not disclosed to 
third parties. The current members of the Advisory Board are as follows: 

   
<TABLE>
<S>                                              <C>
Steven L. Berk, M.D.                             Michael Lange, M.D. 
Chairman of the Scientific Advisory Board        Associate Chief of Infectious Diseases 
Professor and Chairman of Medicine               St. Luke's-Roosevelt Hospital Center 
East Tennessee State University                  New York, New York 

Masashi Kurimoto                                 Jun Minowada, M.D., DMS 
Member of Executive                              Retired 
Board of HBL, Director of                        Former Executive Director of HBL and Director of 
Fujisaki Institute                               Fujisaki Cell Center 

Wayne A. Tompkins, Ph.D.                         James Page, M.D. 
Professor of Immunology and Director             Director of the Company 
of Graduate Programs, North Carolina 
State University 
</TABLE>

    

   The Company has entered into consulting agreements with each Advisor. Each 
agreement is for a one year term. Under each agreement the Company is 
required to pay the Advisor $1,200 per day for consultation services 
requested by the Company and performed by such person. Advisors also receive 
reimbursement of travel 

                                      36 
<PAGE>

   
expenses connected with Company business and stock options and related stock 
appreciation rights under the Director Plan. Consultation services include 
assisting the Company in the development of a research plan to elucidate the 
biological effects, safety and efficacy of the Company's products and 
assisting the Company in analyzing data from research trials and other 
studies concerning the Company's products. The Company anticipates that each 
Advisor will devote approximately six days per year to the affairs of the 
Company in his capacity as an Advisor, consisting of three one-day meetings 
of the Scientific Advisory Board to be held each year and preparation for 
such meetings. 
    

INDEMNIFICATION OF DIRECTORS AND OFFICERS 

   The Company's By-laws provide for the Company to indemnify each director 
and officer of the Company against liabilities imposed upon him (including 
reasonable amounts paid in settlement) and expenses incurred by him in 
connection with any claim made against him or any action, suit or proceeding 
to which he may be a party by reason of his being or having been a director 
or officer of the Company. The Company has also entered into Indemnification 
Agreements with each officer and director pursuant to which the Company will, 
in general, indemnify such persons to the maximum extent permitted by the 
Company's By-Laws and the laws of the State of Texas against any expenses 
(including attorneys' fees), judgments, fines and amounts paid in settlement 
incurred in connection with any actual or threatened action or proceeding to 
which such director or officer is made or threatened to be made a party by 
reason of the fact that such person is or was a director or officer of the 
Company. The foregoing provisions may reduce the likelihood of derivative 
litigation against directors and may discourage or deter shareholders or 
management from suing directors for breaches of their duty of care, even 
though such an action, if successful, might otherwise benefit the Company and 
its shareholders. 

STOCK OPTION PLANS 

   
   In May 1996, the Board of Directors adopted and the shareholders of the 
Company approved both the 1996 Employee Stock Option Plan (the "Employee 
Plan") and the Outside Director and Advisor Stock Option Plan (the "Director 
Plan" and together with the Employee Plan, the "Plans"). 
    

EMPLOYEE PLAN 

   The purpose of the Employee Plan is to serve as an incentive to employees 
for continuous employment with the Company, to maintain competitive 
compensation levels for employees and to more closely align the interests of 
shareholders and employees of the Company. 

   Awards under the Employee Plan shall be in the form of incentive stock 
options ("ISOs"), as defined in Section 422 of the Internal Revenue Code of 
1986, as amended. Limited stock appreciation rights ("Limited Rights") 
relating to such ISOs may also be granted. An aggregate of 150,000 shares of 
Common Stock are reserved for issuance upon the exercise of ISOs granted 
under the Employee Plan. 

   The Employee Plan is administered by a committee of at least two directors 
of the Company (the "Committee") which has the authority, in its sole 
discretion, to grant ISOs and Limited Rights to eligible employees, to 
determine the timing and amount of such awards, to impose limitations, 
restrictions and conditions upon such awards and to interpret the Employee 
Plan and related rules and agreements. 

   All ISOs granted to employees who do not possess more than 10% of the 
total combined voting power of all classes of stock of the Company will be 
exercisable at a price equal to 100% of the fair market value of a share of 
Common Stock on the date of grant and will vest at the rate of 20% per year, 
commencing on the first anniversary of the date of grant. All ISOs granted to 
10% shareholders will be exercisable at a price equal to 110% of the fair 
market value of a share of Common Stock on the date of grant and will vest at 
the rate 25% per year, commencing on the first anniversary of the date of 
grant. The aggregate fair market value of the shares covered by ISOs granted 
under the Employee Plan that become exercisable by a holder for the first 
time in any calendar year is subject to a $100,000 limit. The maximum number 
of shares of Common Stock with respect to which ISOs may be granted in any 
one year to any employee shall not exceed 50,000. 

   ISOs granted to employees who are not 10% shareholders must be exercised 
prior to the expiration of ten years from the date of grant and ISOs granted 
to 10% shareholders must be exercised prior to the expiration of 

                                      37 
<PAGE>

   
five years from the date of grant. ISOs are exercisable only during the 
holder's employment, and, in the case of an involuntary termination of the 
employee, for a period of up to 90 days after the termination of such 
holder's employment to the extent the ISOs were exercisable at the date of 
termination or become exercisable within the 90 days after termination of 
employment. However, in the case of the termination of an optionee's 
employment by reason of his disability or retirement, the ISOs held by him 
may be exercised for a period of 36 months after such termination to the 
extent the ISOs were exercisable at the date of termination. In the case of 
the death of an optionee, any ISO exercisable on the date of the employee's 
death may be exercised by the employee's estate or beneficiaries if such 
exercise occurs within the remaining term of the option but in no event after 
one year after the employee's death. ISOs may not be transferred other than 
by will or the laws of descent and distribution, or pursuant to certain 
qualified domestic relations orders. 
    

   Concurrently with or subsequent to the award of any ISO, the Committee may 
award a Limited Right with respect to each ISO permitting the optionee to be 
paid the appreciation on the Common Stock in lieu of (but not in addition to) 
exercising the ISO. A Limited Right is fully exercisable and must be 
exercised immediately preceding or simultaneously with a Change in Control 
(as defined in the Employee Plan), except that if a Change of Control occurs 
without notice to the holder of the Limited Right or an opportunity by the 
holder of the Limited Right to exercise it, the Limited Right must be 
exercised as soon as practicable after the Change of Control occurs. 

   Any shares of Common Stock subject to an option which has been terminated 
unexercised or expires shall again be available for issuance under the 
Employee Plan, except that shares subject to an option which are not issued 
because the optionee has elected to be paid upon the exercise of a related 
Limited Right shall not again be available for issuance under the Employee 
Plan. 

   In May 1996, the Company granted ISOs to purchase 7,500 shares of Common 
Stock at an exercise price of $5.00 per share to each of Joseph Cummins, 
Charles Hughes and Alan Richards. 

DIRECTOR PLAN 

   The purpose of the Director Plan is to provide an incentive to outside 
directors and members of the Company's Scientific Advisory Board ("Advisors") 
for continuous association with the Company and to reinforce the relationship 
between participants' rewards and shareholder gains. 

   Awards under the Director Plan are in the form of so-called non-qualified 
stock options and Limited Rights relating to such options. An aggregate of 
100,000 shares of Common Stock are reserved for issuance upon exercise of 
options granted under the Director Plan. Options under the Director Plan may 
be granted only to directors or Advisors who are not officers or employees of 
the Company. 

   The Director Plan is administered by a committee of at least two directors 
of the Company which has the authority, in its sole discretion, to interpret 
the Plan, to adopt, amend and rescind rules and regulations relating to the 
Plan and to otherwise administer the Plan. However, all options and Limited 
Rights granted under the Plan are automatic and non-discretionary. 

   The Director Plan provides that on the day following the date of this 
Prospectus or, if later, the date a person first becomes an outside director 
of or Advisor to the Company, each outside director or Advisor shall be 
awarded options to purchase an aggregate of 10,000 and 5,000 shares, 
respectively, of Common Stock, except any outside director who is an Advisor 
shall be granted options to purchase 10,000 shares of Common Stock as a 
director and shall not be granted any options as an Advisor. Concurrently 
with the award of options, each director and Advisor shall also be awarded an 
equal number of Limited Rights. 

   All options granted under the Director Plan will be exercisable at a price 
equal to 100% of the fair market value of a share of Common Stock on the date 
of grant and will vest at the rate of 20% per year, commencing on the first 
anniversary of the date of grant. Options must be exercised prior to the 
expiration of ten years from the date of grant. 

   The provisions of the Director Plan relating to exercisability of 
outstanding options after the optionee's termination of association with the 
Company by virtue of his death, disability or the involuntary termination of 
the optionee's employment and the exercise of Limited Rights are the same as 
the provisions of the Employee Plan relating thereto. Options under the 
Director Plan may not be transferred other than by will or the laws of 
descent and distribution. 

                                      38 
<PAGE>

   On the day after the date of this Prospectus, options to purchase an 
aggregate of 10,000 shares of Common Stock at an exercise price of $5.00 per 
share will be granted to each of Stephen Chen, James Cook, Katsuaki 
Hayashibara, Dennis Moore and James Page, each of whom is a director of the 
Company, and options to purchase an aggregate of 5,000 shares of Common Stock 
at an exercise price of $5.00 per share will be granted to each of Steven 
Berk, Masashi Kurimoto, Wayne Tompkins, Michael Lange and Jun Minowada, each 
of whom is an Advisor. 

                                      39 
<PAGE>

                            PRINCIPAL SHAREHOLDERS 

   The following table sets forth information as of the date of this 
Prospectus and as adjusted to reflect the sale of 2,000,000 shares offered 
hereby, based upon information obtained from the persons named below, 
relating to the beneficial ownership of shares of Common Stock by (i) each 
person known to the Company to own five percent or more of the outstanding 
Common Stock, (ii) each director of the Company and (iii) all officers and 
directors of the Company as a group. 

<TABLE>
<CAPTION>
                                                      
                                                       Amount and Nature   
                                                         of Beneficial     Percentage of Shares Owned 
                                                           Ownership       -------------------------  
Name and Address                                                        Before Offering      Before         After     
of Beneficial Owner                                           (1)           Offering    Offering (2) 
- ---------------------------------------------------   -----------------   ----------    ------------ 
<S>                                                    <C>                <C>           <C>
Hayashibara Biochemical 
 Laboratories, Inc. 
2-3, Shimoishii 1-chome 
Okayama 700, Japan  ................................       1,032,756          34.0%         31.9%(3) 
Dr. Joseph Cummins 
800 West 9th Avenue 
Amarillo, Texas 79101  .............................         666,804(4)       22.0%         13.6% 
Mesa, Inc. 
P.O. Box 2009 
Amarillo, Texas 79189-2009  ........................         315,120          10.4%          6.2% 
Dr. Dennis Moore 
P.O. Box 1553 
Hamilton, Montana 59840  ...........................         149,616           4.9%          2.9% 
Katsuaki Hayashibara 
Hayashibara Biochemical 
 Laboratories, Inc. 
1-2-3, Shimoishii 
Okayama 700, Japan  ................................          48,240(5)        1.6%             * 
Dr. Stephen Chen 
6 Persimmon Court 
East Brunswick, New Jersey 08816  ..................              --          --            -- 
James Cook 
13711 Basalt Court 
Broomfield, Colorado 80020  ........................          66,600(6)        2.2%          1.3% 
Dr. James Page 
103 Clubhouse Lane 
Naples, Florida 33942  .............................              --          --            -- 
All officers and directors as a group (nine persons)       1,033,824(7)       34.1%         21.8% 

</TABLE>

   
- ------ 
* Less than 1% 
    

(1) A person is deemed to be the beneficial owner of securities that can be 
    acquired by such person within 60 days from the date of this Prospectus 
    upon the exercise of options or warrants. Each beneficial owner's 
    percentage ownership is determined by assuming that options that are held 
    by such person (but not those held by any other person) and that are 
    exercisable within 60 days from the date of this Prospectus have been 
    exercised. Except as otherwise indicated, the Company believes that each 
    of the persons named has sole voting and investment power with respect to 
    the shares shown as beneficially owned by him. 

(2) Gives effect to the issuance of 30,000 shares of Common Stock to Joseph 
    Cummins and an aggregate of 49,000 shares of Common Stock to two officers 
    simultaneously with the consummation of the sale of the Common Stock 
    offered hereby - See "Management-Employment Agreements" and "Certain 
    Transactions." 

   
(3) Gives effect to the purchase by HBL of 600,000 of the 2,000,000 shares 
    offered hereby. 
    

(4) Includes an aggregate of 337,666 shares of Common Stock held by Joseph 
    Cummins as trustee under certain trusts for the benefit of his children 
    and 360 shares owned by Dr. Cummins wife. 

(5) Does not include 1,032,756 shares owned by HBL. 

(6) All of such shares are owned jointly with Mr. Cook's wife. 

   
(7) Includes an aggregate of 22,344 shares of Common Stock held by one 
    officer as trustee of a trust, an aggregate of 33,044 shares of Common 
    Stock held by such officer as the executor of an estate, an aggregate of 
    960 shares of Common Stock held by such officer as the trustee of a 
    profit sharing plan and an aggregate of 17,616 shares of Common Stock 
    owned by a law firm of which such officer is a member. 
    

   Joseph Cummins and HBL may be deemed "parents" of the Company and Joseph 
Cummins may be deemed a "promoter" of the Company, as such terms are defined 
under the federal securities laws. 

                                      40 
<PAGE>

                             CERTAIN TRANSACTIONS 

   
   The Company has relied significantly on HBL, the principal shareholder of 
the Company, for a substantial portion of its capital requirements. From 1989 
to the date of this Prospectus, HBL has provided an aggregate of $9,000,000 
of funding pursuant to the Development Agreement, purchased from the Company 
an aggregate of 461,520 shares of Common Stock for a total purchase price of 
$1,443,800 and made loans to the Company aggregating $3,000,000, of which 
$1,000,000 loaned after March 31, 1996 will be repayable simultaneously with 
the consummation of this offering. As of March 31, 1996, the outstanding 
amount of the Company's indebtedness to HBL (including accrued interest) was 
$2,483,699. Of the shares of Common Stock being sold in this offering, 
600,000 shares of Common Stock have been reserved for sale, at the initial 
public offering price, to HBL or its designees. Giving effect to the sale of 
2,000,000 shares of the Company's Common Stock pursuant to this offering, 
including 600,000 shares to HBL, HBL will own approximately 31.9% of the 
Company's Common Stock. In addition to the Development Agreement, HBL and the 
Company are parties to various license and manufacturing and supply 
agreements pursuant to which the Company licenses certain technology to or 
from HBL and HBL supplies formulations of its IFN|ga to the Company. 
    

   In May 1996, the Company amended the employment agreements of three 
officers to provide that in lieu of issuing an aggregate of 126,000 shares of 
Common Stock that were originally to be issued to such persons as a result of 
their satisfying certain criteria under which the Common Stock becomes 
issuable, the Company will issue an aggregate of 79,000 shares and use 
$235,000 of the proceeds of this offering to satisfy withholding tax 
obligations relating to such issuances. The amended employment agreement 
between the Company and Dr. Cummins provides for the term of Dr. Cummins' 
employment agreement to be extended to December 31, 1999. See "Management -- 
Employment Agreements." 

   Pursuant to a Contract Termination and Severance Agreement with Edward 
Sherwood, a former President of the Company, in January 1995 the Company 
issued to Mr. Sherwood an aggregate of 29,640 shares of Common Stock and 
satisfied the withholding tax obligations relating to such issuance. 

   
   Pursuant to a Stock Purchase Agreement entered into in September 1987 
between the Company and Mesa, Inc. ("Mesa"), which owns 315,120 shares of 
Common Stock as of the date of this Prospectus, the Company has agreed that 
for as long as Mesa is a shareholder of the Company, the Company shall not 
without the prior written approval of Mesa engage in any repurchase or 
redemption of its issued and outstanding shares of Common Stock, unless such 
repurchase or redemption is offered, pro rata, to all then existing 
shareholders. 
    

   During the year ended December 31, 1995, the Company accrued an aggregate 
of $68,700 for legal services rendered by Morris, Moore, Moss and Douglas, 
P.C. Edward Morris, the Secretary of the Company, is a member of such firm. 

   Effective upon the consummation of the sale of Common Stock offered 
hereby, HBL has agreed to indemnify the Company and its officers, directors, 
employees and agents for litigation expenses, losses, damages and amounts 
paid in settlement arising out of litigation which may be brought by Roche or 
its affiliates relating to the Roche Patent. 

   
   Although the Company believes that the foregoing transactions were on 
terms no less favorable to the Company than would have been available from 
unaffiliated third parties in arm's length transactions, there can be no 
assurance that this is the case. All future transactions and loans between 
the Company and its officers, directors and 5% shareholders will be on terms 
no less favorable to the Company than could be obtained from independent, 
third parties. There can be no assurance, however, that future transactions 
or arrangements between the Company and its affiliates will be advantageous, 
that conflicts of interest will not arise with respect thereto or that if 
conflicts do arise, that they will be resolved in favor of the Company. 
    

                                      41 
<PAGE>

                         DESCRIPTION OF COMMON STOCK 

   The Company is authorized to issue 10,000,000 shares of Common Stock, par 
value $.01 per share. As of the date of this Prospectus, there are 3,035,232 
shares outstanding (not including an aggregate of 79,000 shares to be issued 
to three officers simultaneously with the sale of the Common Stock offered 
hereby) which are held by 135 holders of record. 

   
   The holders of Common Stock are entitled to one vote for each share held 
of record on all matters to be voted on by shareholders. There is no 
cumulative voting with respect to the election of directors, with the result 
that the holders of more than 50% of the shares voting for the election of 
directors can elect all of the directors. The holders of Common Stock are 
entitled to receive dividends when, as and if declared by the Board of 
Directors in its discretion, out of funds legally available therefor. In the 
event of liquidation, dissolution or winding up of the Company, the holders 
of Common Stock are entitled to share ratably in the assets of the Company, 
if any, legally available for distribution to them after payment of debts and 
liabilities of the Company and after provision has been made for each class 
of stock, if any, having liquidation preference over the Common Stock. 
Holders of shares of Common Stock have no conversion, preemptive or other 
subscription rights, and there are no redemption or sinking fund provisions 
applicable to the Common Stock. 

   The Company has agreed that for so long as Mesa is a shareholder of the 
Company, the Company shall not without the prior written approval of Mesa 
engage in any repurchase or redemption of its issued and outstanding shares 
of Common Stock, unless such repurchase or redemption is offered, pro rata, 
to all the existing shareholders. 

   All of the outstanding shares of Common Stock are, and the shares of 
Common Stock offered hereby will be, when issued upon payment of the 
consideration set forth in this Prospectus, fully paid and non-assessable. 
    

TRANSFER AGENT AND REGISTRAR 

   The Transfer Agent and Registrar for the Common Stock is American Stock 
Transfer & Trust Company, 40 Wall Street, New York, New York 10005. 

REPORTS TO SHAREHOLDERS 

   The Company intends to furnish its shareholders annual reports containing 
audited financial statements and such other periodic reports as the Company 
may determine to be appropriate or as may be required by law. 

   The Company has agreed, subject to the sale of the shares offered hereby, 
that on or before the date of this Prospectus, it will register its Common 
Stock under the provisions of Section 12(g) of the Exchange Act and has 
agreed with the Underwriter that it will use its best efforts to maintain 
such registration for five years. Such registration will require the Company 
to comply with periodic reporting, proxy solicitation and certain other 
requirements of the Exchange Act. 

                       SHARES ELIGIBLE FOR FUTURE SALE 

   
   Upon the consummation of this offering, the Company will have 5,114,232 
shares of Common Stock outstanding (assuming no exercise of the Underwriter's 
over-allotment option or other outstanding options). Up to 600,000 of the 
2,000,000 shares offered hereby may be purchased by HBL and, if purchased, 
will be subject to certain restrictions on sale imposed under the federal 
securities laws. The remaining shares of Common Stock being offered hereby 
will be immediately tradeable without restriction or further registration 
under the Securities Act. All of the 3,035,232 shares of Common Stock 
outstanding as of the date of this Prospectus are, and all of the 79,000 
shares to be issued to three officers of the Company simultaneously with the 
consummation of the sale of the Common Stock offered hereby will be, deemed 
to be "restricted securities," as that term is defined under Rule 144 
promulgated under the Securities Act, in that such shares were acquired by 
the shareholders of the Company in transactions not involving a public 
offering, and, as such, may only be sold pursuant to a registration statement 
under the Securities Act, in compliance with the exemption provisions of Rule 
144, or pursuant to another exemption under the Securities Act. Of such 
3,114,232 restricted shares of Common Stock, an aggregate of 1,040,976 shares 
are immediately eligible for sale, without registration, under Rule 144 
(subject to 
    

                                      42 
<PAGE>

the contractual restrictions described below). An additional 1,964,616 shares 
will become eligible for sale (subject to the volume limitations prescribed 
in Rule 144 and such contractual restrictions) commencing 90 days after the 
date of this Prospectus. The balance of such shares will become so eligible 
at various times commencing in January 1997. Notwithstanding the foregoing, 
stockholders of the Company owning of record more than 99% of the Common 
Stock outstanding as of the date of this Prospectus, have agreed not to sell 
or otherwise dispose of any shares of Common Stock beneficially owned by them 
for a period of 12 months from the date of this Prospectus without the 
Underwriter's prior written consent. 

   In general, under Rule 144 as currently in effect, any person (or persons 
whose shares are aggregated) who has beneficially owned restricted shares for 
at least two years is entitled to sell, within any three-month period, a 
number of shares that does not exceed the greater of 1% of the then 
outstanding shares of the issuer's common stock or the average weekly trading 
volume during the four calendar weeks preceding such sale, provided that 
certain public information about the issuer as required by Rule 144 is then 
available and the seller complies with certain other requirements. Affiliates 
will be subject to the provisions of Rule 144, except that the holding period 
requirement does not apply to sales by affiliates of shares which are not 
restricted securities. A person who is not an affiliate, has not been an 
affiliate within three months prior to sale, and has beneficially owned the 
restricted shares for at least three years is entitled to sell such shares 
under Rule 144 without regard to any of the limitations described above. 

   Prior to this offering, there has been no market for the Common Stock and 
no prediction can be made as to the effect, if any, that market sales of 
Common Stock or the availability of such shares for sale will have on the 
market price prevailing from time to time. Nevertheless, the possibility that 
substantial amounts of Common Stock may be sold in the public market may 
adversely affect prevailing market prices for the Common Stock and could 
impair the Company's ability to raise capital through the sale of its equity 
securities. 

                                 UNDERWRITING 

   Whale Securities Co., L.P. (the "Underwriter") has agreed, subject to the 
terms and conditions contained in the Underwriting Agreement, to purchase 
2,000,000 shares of Common Stock from the Company. The Underwriter is 
committed to purchase and pay for all of the Common Stock offered hereby if 
any of such securities are purchased. The shares of Common Stock are being 
offered by the Underwriter, subject to prior sale, when, as and if delivered 
to and accepted by the Underwriter and subject to approval of certain legal 
matters by counsel and to certain other conditions. 

   The Underwriter has advised the Company that it proposes to offer the 
Common Stock to the public at the public offering price set forth on the 
cover page of this Prospectus. The Underwriter may allow to certain dealers 
who are members of the National Association of Securities Dealers, Inc. (the 
"NASD") concessions, not in excess of $   per share of Common Stock, of which 
not in excess of $   per share of Common Stock may be reallowed to other 
dealers who are members of the NASD. 

   The Company has granted to the Underwriter an option, exercisable for 45 
days from the date of this Prospectus, to purchase up to 300,000 additional 
shares of Common Stock at the public offering price set forth on the cover 
page of this Prospectus, less the underwriting discounts and commissions. The 
Underwriter may exercise this option in whole or, from time to time, in part, 
solely for the purpose of covering over-allotments, if any, made in 
connection with the sale of the shares of Common Stock offered hereby. 

   The Company has agreed to pay to the Underwriter a non-accountable expense 
allowance of 3% of the gross proceeds of this offering (including gross 
proceeds received as a result of the exercise of the Underwriter's 
over-allotment option), of which $50,000 has been paid as of the date of this 
Prospectus. The Company has also agreed to pay all expenses in connection 
with qualifying the shares of Common Stock offered hereby for sale under the 
laws of such states as the Underwriter may designate, including expenses of 
counsel retained for such purpose by the Underwriter. 

   
   The Company has agreed to sell to the Underwriter and its designees for an 
aggregate of $200, warrants (the "Underwriter's Warrants") to purchase up to 
200,000 shares of Common Stock at a purchase price of $8.10 per share. The 
Underwriter's Warrants may not be sold, transferred, assigned or hypothecated 
for one year from the date of this Prospectus, except to the officers and 
partners of the Underwriter and members of the selling 
    

                                      43 
<PAGE>

group, and are exercisable during the four-year period commencing one year 
after the date of this Prospectus (the "Warrant Exercise Term"). During the 
Warrant Exercise Term, the holders of the Underwriter's Warrants are given, 
at nominal cost, the opportunity to profit from a rise in the market price of 
the Company's Common Stock. To the extent that the Underwriter's Warrants are 
exercised, dilution to the interests of the Company's stockholders will 
occur. Further, the terms upon which the Company will be able to obtain 
additional equity capital may be adversely affected since the holders of the 
Underwriter's Warrants can be expected to exercise them at a time when the 
Company would, in all likelihood, be able to obtain any needed capital on 
terms more favorable to the Company than those provided in the Underwriter's 
Warrants. Any profit realized by the Underwriter on the sale of the 
Underwriter's Warrants or the underlying shares of Common Stock may be deemed 
additional underwriting compensation. Subject to certain limitations and 
exclusions, the Company has agreed, at the request of the holders of a 
majority of the Underwriter's Warrants, at the Company's expense, to register 
the Underwriter's Warrants and the shares of Common Stock issuable upon 
exercise of the Underwriter's Warrants under the Securities Act on one 
occasion during the Warrant Exercise Term and to include the Underwriter's 
Warrants and all such underlying securities in any appropriate Registration 
Statement which is filed by the Company during the seven years following the 
date of this Prospectus. 

   The Company has agreed for a period of five years from the date of this 
Prospectus, if so requested by the Underwriter, to nominate and use its best 
efforts to elect a designee of the Underwriter as a director of the Company, 
or, at the Underwriter's option, as a non-voting advisor to the Company's 
Board of Directors. The Underwriter has not yet exercised its right to 
designate such a person. 

   In addition, the Company has agreed to retain the Underwriter as a 
financial consultant for a period of two years from the consummation of this 
offering at an annual fee of $30,000, the entire $60,000 payable in full, in 
advance, upon the consummation of this offering. The consulting agreement 
will not require the consultant to devote a specific amount of time to the 
performance of its duties thereunder. It is anticipated that these consulting 
services will be provided by principals of the Underwriter and/or members of 
the Underwriter's corporate finance department who, however, have not been 
designated as of the date hereof. In the event that the Underwriter 
originates a financing or a merger, acquisition, joint venture or other 
transaction to which the Company is a party, the Underwriter will be entitled 
to receive a finder's fee in consideration for origination of such 
transaction. 

   The Underwriter has informed the Company that it does not expect sales 
made to discretionary accounts to exceed 1% of the securities offered hereby. 

   The Company has agreed to indemnify the Underwriter against certain 
liabilities, including liabilities under the Securities Act. 

   All of the officers and directors and shareholders of the Company owning 
of record more than 99% of the Common Stock outstanding as of the date of 
this Prospectus, have agreed that they will not sell any shares of Common 
Stock of the Company for a period of 12 months after the date of this 
Prospectus without the prior written consent of the Underwriter. 

   Prior to this offering, there has been no public trading market for the 
Common Stock. Consequently, the initial public offering price of the Common 
Stock has been determined by negotiation between the Company and the 
Underwriter and is not necessarily related to the Company's asset value, net 
worth or other established criteria of value. Among the factors considered in 
determining the offering price were the Company's financial condition and 
prospects, management, market prices of similar securities of comparable 
publicly-traded companies, certain financial and operating information of 
companies engaged in activities similar to those of the Company and the 
general condition of the securities market. 

                                LEGAL MATTERS 

   The legality of the Common Stock offered hereby will be passed upon for 
the Company by Lowenthal, Landau, Fischer & Bring, P.C., New York, New York. 
Certain legal matters have been passed upon for the Underwriter by Tenzer 
Greenblatt LLP, New York, New York. 

                                      44 
<PAGE>

                                   EXPERTS 

   
   The consolidated financial statements of the Company and its subsidiaries 
(companies in the development stage) at December 31, 1995 and for each of the 
two years in the period ended December 31, 1995, appearing in this Prospectus 
and Registration Statement have been audited by Ernst & Young LLP, 
independent auditors, as set forth in their report thereon appearing 
elsewhere herein, and are included in reliance upon such report given upon 
the authority of such firm as experts in accounting and auditing. 
    

                            ADDITIONAL INFORMATION 

   
   The Company has filed with the Commission a Registration Statement under 
the Securities Act with respect to the Common Stock offered by this 
Prospectus. This Prospectus, filed as a part of such Registration Statement, 
does not contain all of the information set forth in, or annexed as exhibits 
to, the Registration Statement, certain parts of which are omitted in 
accordance with the rules and regulations of the Commission. For further 
information with respect to the Company and this offering, reference is made 
to the Registration Statement, including the exhibits filed therewith, which 
may be inspected without charge at the Commission's principal office at 
Judiciary Plaza, 450 Fifth Street, N.W., Washington D.C. 20549, at the 
Chicago Regional Office, 500 West Madison Street, Chicago, Illinois 
60601-2511, and at the New York Regional Office, 7 World Trade Center, New 
York, New York 10048. Copies of the Registration Statement may be obtained 
from the Commission's Public Reference Section upon payment of prescribed 
fees. Statements contained in this Prospectus as to the contents of any 
contract or other document are not necessarily complete and, where the 
contract or other document has been filed as an exhibit to the Registration 
Statement, each statement is qualified in all respects by reference to the 
applicable document filed with the Commission. 

                                      45 
    
<PAGE>

   
                                   GLOSSARY 
    

<TABLE>
<CAPTION>
<S>                                  <C>
AIDS  .............................  Acquired Immunodeficiency Syndrome 
ANTIPROLIFERATIVE  ................  Slowing or stopping the multiplication of cells. 
APHTHOUS STOMATITIS  ..............  Painful ulcers occurring in the mucosal lining of the mouth. 
BIOLOGIC  .........................  A product derived from living cells which is used to treat 
                                     or diagnose disease. 
CIRRHOSIS  ........................  Fibrosis of the liver with hardening caused by excessive 
                                     formation of connective tissue followed by contraction. 
CLINICAL TRIALS  ..................  The investigational use of a product in humans or animals. 
                                     Phase I trials test the product for general safety and 
                                     metabolism. Phase II trials test various dosages for efficacy 
                                     and Phase III trials test the chosen dosage in many patients. 
DISTAL  ...........................  Far from the point of origin. 
FELINE HERPESVIRUS-1 INFECTION  ...  Feline viral rhinotracheitis - a viral disease of the upper 
                                     respiratory tract of cats. 
FIBROMYALGIA  .....................  A debilitating disease characterized by pain at specific 
                                     "trigger points", fatigue, sleeplessness, headaches and 
                                     stiffness. 
HEPATITIS B (HBV)  ................  Disease of the liver caused by a DNA virus. 
HEPATITIS C (HCV)  ................  Disease of the liver caused by an RNA virus. 
IMMUNOMODULATORY  .................  That which modulates (augments or diminishes) immune responses. 
INDICATION  .......................  A specific condition intended to be treated by a drug or biologic. 
INTERFERON (IFN)  .................  A natural protein produced by all species of animals in response 
                                     to infection by viruses and other intracellular microorganisms. 
IFN|ga  ...........................  Interferon alpha, a distinct class of IFN. 
INTERNATIONAL UNIT (IU)  ..........  An internationally accepted measure of IFN|ga anti- viral 
                                     activity. 
INAD  .............................  Notice of Claimed Investigational Exemption for a New Animal 
                                     Drug. A document that must be submitted to the FDA before 
                                     animal clinical trials can be conducted using a new drug or 
                                     biologic. 
IND  ..............................  Investigational New Drug Application. A document that must 
                                     be submitted to the FDA before human clinical trials can be 
                                     conducted using a new drug or biologic. 
KERATOCONJUNCTIVITIS SICCA  .......  Inflammation of the cornea and conjunctiva of the eye resulting 
                                     in a decrease in tear production. 
LOZENGE  ..........................  A solid dosage formulation designed to dissolve in the mouth 
                                     and deliver a drug, biologic or active ingredient to the oral 
                                     cavity. 
MASTITIS  .........................  Inflammation of the mammary gland. 
ORAL MUCOSITIS  ...................  Inflammation and ulcers of the mucosal lining of the mouth, 
                                     often associated with the use of chemotherapy and/or radiation 
                                     therapy in cancer patients. 
PARENTERAL  .......................  By injection, not by the digestive tract. 

                                      46 
<PAGE>

SHIPPING FEVER  ...................  A bovine respiratory disease complex observed in cattle after 
                                     shipment. Usually shipping fever is a combination of viral 
                                     and bacterial infections. 
SJOGREN'S SYNDROME  ...............  A symptom complex of unknown cause marked by 
                                     keratoconjunctivitis sicca (dry eye) and xerostomia (dry 
                                     mouth). 
</TABLE>

                                      47 
<PAGE>

                 AMARILLO BIOSCIENCES, INC. AND SUBSIDIARIES 
                     (COMPANIES IN THE DEVELOPMENT STAGE) 
                  INDEX TO CONSOLIDATED FINANCIAL STATEMENTS 

<TABLE>
<CAPTION>
                                                                                                          Page 
                                                                                                        -------- 
<S>                                                                                                        <C>
Report of Independent Auditors  ......................................................................     F-2 
Consolidated Balance Sheets as of December 31, 1995 and March 31, 1996 (Unaudited)  ..................     F-3 
Consolidated Statements of Operations for the years ended December 31, 1994 and 1995 and the unaudited 
  three months ended March 31, 1995 and 1996 and cumulative from June 25, 1984 (inception) through 
  March 31, 1996 (unaudited) .........................................................................     F-4 
Consolidated Statements of Shareholders' Deficit for the years ended December 31, 1994 and 1995 
  and the three months ended March 31, 1996 (unaudited) and cumulative from June 25, 1984 (inception) 
  through March 31, 1996 (unaudited) .................................................................     F-5 
Consolidated Statements of Cash Flows for the years ended December 31, 1994 and 1995 and the unaudited 
  three months ended March 31, 1995 and 1996 and cumulative from June 25, 1984 (inception) through 
  March 31, 1996 (unaudited) ..........................................................................    F-6 
Notes to Consolidated Financial Statements  ..........................................................     F-7 
</TABLE>

                                       F-1
<PAGE>

                        REPORT OF INDEPENDENT AUDITORS 

The Board of Directors 
Amarillo Biosciences, Inc. 
We have audited the accompanying consolidated balance sheet of Amarillo 
Biosciences, Inc. and subsidiaries (companies in the development stage) as of 
December 31, 1995, and the related consolidated statements of operations, 
shareholders' deficit and cash flows for each of the two years in the period 
ended December 31, 1995. These financial statements are the responsibility of 
the Company's management. Our responsibility is to express an opinion on 
these financial statements based on our audits. 

We conducted our audits in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement. An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements. 
An audit also includes assessing the accounting principles used and 
significant estimates made by management, as well as evaluating the overall 
financial statement presentation. We believe that our audits provide a 
reasonable basis for our opinion. 

In our opinion, the consolidated financial statements referred to above 
present fairly, in all material respects, the consolidated financial position 
of Amarillo Biosciences, Inc. and subsidiaries at December 31, 1995, and the 
consolidated results of their operations and their cash flows for each of the 
two years in the period ended December 31, 1995, in conformity with generally 
accepted accounting principles. 
                                                     ERNST & YOUNG LLP 
Dallas, Texas 
February 1, 1996, 
  except for Note 13, as to which the date is 
  May 14, 1996 

                                       F-2
<PAGE>

                 AMARILLO BIOSCIENCES, INC. AND SUBSIDIARIES 
                     (COMPANIES IN THE DEVELOPMENT STAGE) 
                         CONSOLIDATED BALANCE SHEETS 
   

<TABLE>
<CAPTION>
                                                                          December 31,      March 31, 
                                                                              1995            1996 
                                                                         --------------   ------------- 
                                                                                           (Unaudited) 
<S>                                                                      <C>              <C>
Assets 
Current assets: 
   Cash and cash equivalents .........................................    $ 1,108,527      $   724,280 
   Prepaid expenses ..................................................         26,395           16,229 
                                                                         --------------   ------------- 
          Total current assets  ......................................      1,134,922          740,509 
Property and equipment, net (Note 2)  ................................        114,593          114,110 
Patent license, net of accumulated amortization of $59,118 and $60,946 
   at December 31, 1995 and March 31, 1996 (unaudited), respectively (Note 
   5) ................................................................         65,882           64,054 
Organizational costs, net of accumulated amortization of $6,335 and $6,667 
   at December 31, 1995 and March 31, 1996 (unaudited), respectively .            663              331 
Investment in ISI common stock (Note 12)  ............................        475,000          505,000 
                                                                         --------------   ------------- 
Total assets  ........................................................    $ 1,791,060      $ 1,424,004 
                                                                         ==============   ============= 
Liabilities and Shareholders' Deficit 
Current liabilities: 
   Deferred contract revenues (Note 4) ...............................    $   417,140      $    14,566 
   Accounts payable ..................................................        148,274          100,175 
   Accrued interest expense ..........................................        453,699          483,699 
   Accrued restricted stock grants ...................................        114,844          124,687 
   Other accrued expenses ............................................         19,000           19,967 
                                                                         --------------   ------------- 
          Total current liabilities  .................................      1,152,957          743,094 
Notes payable to related party (Note 3)  .............................      2,000,000        2,000,000 
                                                                         --------------   ------------- 
Total liabilities  ...................................................      3,152,957        2,743,094 
                                                                         --------------   ------------- 
Commitments and contingencies (Notes 4, 5, 6, and 10) 

Shareholders' deficit (Notes 7 and 13): 
Common stock, $.01 par value: 
   Authorized shares - 10,000,000 
   Issued shares - 3,048,672 .........................................         30,487           30,487 
   Additional paid-in capital ........................................      3,589,591        3,589,591 
   Deficit accumulated during the development stage ..................     (4,955,975)      (4,943,168) 
   Unrealized gain on marketable securities ..........................             --           30,000 
   Treasury stock - 13,440 shares, at cost ...........................        (26,000)         (26,000) 
                                                                         --------------   ------------- 
Total shareholders' deficit  .........................................     (1,361,897)      (1,319,090) 
                                                                         --------------   ------------- 
Total liabilities and shareholders' deficit  .........................    $ 1,791,060      $ 1,424,004 
                                                                         ==============   ============= 
    
</TABLE>

See accompanying notes. 

                                       F-3
<PAGE>

                 AMARILLO BIOSCIENCES, INC. AND SUBSIDIARIES 
                     (COMPANIES IN THE DEVELOPMENT STAGE) 
                    CONSOLIDATED STATEMENTS OF OPERATIONS 
   
<TABLE>
<CAPTION>
                                                                                                          Cumulative 
                                                                                                             from 
                                                                                                           June 25, 
                                                                                                             1984 
                                                                                                          (Inception) 
                                                  Year ended                  Three months ended            through 
                                         December 31,     December 31,      March 31,     March 31,        March 31, 
                                             1994             1995            1995           1996            1996 
                                        --------------   --------------    ------------   -----------   --------------- 
                                                                           (Unaudited)   (Unaudited)      (Unaudited) 
<S>                                     <C>              <C>              <C>            <C>            <C>
Revenues: 
   Contract revenues (Note 4) .......   $2,480,093       $1,361,395       $  618,266      $  402,574      $ 8,985,434 
   Interferon sales .................       40,525               --               --           2,000          415,773 
   Interest income ..................      132,713           94,867           28,803          11,154          520,430 
   Sublicense fees (Note 12) ........           --           50,000               --              --          108,334 
   Royalty income ...................           --               --               --              --           31,544 
   Other (Note 12) ..................           --          500,000               --              --          509,371 
                                        --------------   --------------    ------------   -----------   --------------- 
                                         2,653,331        2,006,262          647,069         415,728       10,570,886 

Expenses: 
   Research and development expenses. .  1,364,042          875,093          247,978         134,209        6,585,071 
   Selling, general, and administrative 
     expenses  ......................    1,298,528        1,322,748          444,025         238,712        8,408,162 
   Interest expense .................      120,000          120,000           30,000          30,000          485,821 
                                        --------------   --------------    ------------   -----------   --------------- 
                                         2,782,570        2,317,841          722,003         402,921       15,479,054 
                                        --------------   --------------    ------------   -----------   --------------- 

Income (loss) before income taxes  ..     (129,239   )     (311,579   )      (74,934   )      12,807       (4,908,168) 
Income tax expense (Note 9)  ........           --               --               --              --           35,000 
                                        --------------   --------------    ------------   -----------   --------------- 
Net income (loss)  ..................   $  (129,239   )  $  (311,579   )  $   (74,934   ) $   12,807      $ (4,943,168) 
                                        ==============   ==============    ============   ===========   =============== 
Income (loss) per share  ............   $        (.04)   $        (.10)   $        (.02)  $       -- 
                                        ==============   ==============    ============   =========== 
Weighted average shares outstanding .    3,005,592        3,034,339        3,031,609       3,035,232 
                                        ==============   ==============    ============   =========== 

    
</TABLE>

See accompanying notes. 

                                       F-4
<PAGE>

                 AMARILLO BIOSCIENCES, INC. AND SUBSIDIARIES 
                     (COMPANIES IN THE DEVELOPMENT STAGE) 
               CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT 
     CUMULATIVE FROM JUNE 25, 1984 (INCEPTION) THROUGH DECEMBER 31, 1996 
   
<TABLE>
<CAPTION>
                                                   Issuance           Common Stock 
                                                               ------------------------- 
                                                     Price      Shares Issued    Amount 
                                                  -----------   -------------    -------- 
<S>                                               <C>          <C>               <C>
1984: 
Initial issuance for cash  ....................      $.29            84,000      $   840 
Initial issuance in exchange for legal fees  ..       .29            30,000          300 
Initial issuance in exchange for services and 
  research and development costs ..............       .01         1,086,000       10,860 
1985: 
Issuance for cash  ............................       .83           102,000        1,020 
Issuance in exchange for professional fees, 
  salaries, and research services .............       .83            10,800          108 
1986: 
Issuance in exchange for professional fees, 
  salaries, and services ......................       .83            22,800          228 
Treasury stock purchase, 11,040 shares at cost                           --           -- 
Issuance for cash  ............................    .83 -1.25        182,352        1,824 
Issuance in exchange for professional fees, 
  salaries, and research services .............       .83            19,020          190 
1987: 
Issuance for cash  ............................   1.25 - 2.08       309,648        3,096 
Treasury stock purchase, 2,400 shares at cost                            --           -- 
1988: 
Issuance for cash  ............................      1.88           120,972        1,210 
1989: 
Issuance for cash  ............................      2.08             2,568           26 
Issuance for cash  ............................      2.50           227,748        2,277 
1990: 
Issuance for cash  ............................   1.72 - 2.50       592,584        5,926 
Issuance for cash  ............................      4.17           174,000        1,740 
Issuance in exchange for note receivable from 
  shareholder .................................      2.50            54,540          545 
1991: 
Repayment of note receivable from shareholder                            --           -- 
Net loss cumulative from June 25, 1984 
  (inception) through December 31, 1991 .......                          --           -- 
1992: 
Net loss for year ended December 31, 1992  ....                          --           -- 
                                                  -----------   -------------    -------- 
Balance at December 31, 1992  .................                   3,019,032       30,190 
1993: 
Net loss for year ended December 31, 1993  ....                          --           -- 
                                                  -----------   -------------    -------- 
Balance at December 31, 1993  .................                   3,019,032       30,190 
1994: 
Net loss for year ended December 31, 1994  ....                          --           -- 
Adjustment to unrealized losses on marketable 
  securities ..................................                          --           -- 
                                                  -----------   -------------    -------- 
Balance at December 31, 1994  .................                   3,019,032       30,190 
1995: 
Issuance for stock grant  .....................      2.50            29,640          297 
Net loss for year ended December 31, 1995  ....                          --           -- 
Adjustment to unrealized losses on marketable 
  securities ..................................                          --           -- 
                                                  -----------   -------------    -------- 
Balance at December 31, 1995  .................                   3,048,672       30,487 
1996: 
Net income for three months ended March 31, 
  1996 (unaudited) ............................                          --           -- 
Adjustment to unrealized gain on marketable 
  securities (unaudited) ......................                          --           -- 
                                                  -----------   -------------    -------- 
Balance at March 31, 1996 (unaudited)  ........                   3,048,672      $30,487 
                                                  ===========   =============    ======== 
    
</TABLE>

<PAGE>
   

<TABLE>
<CAPTION>
                                                                     Deficit                                                  
                                                                   Accumulated    Unrealized      Note                   
                                                                     During the Gain (Loss) on  Receivable                Total  
                                                    Additional     Development    Marketable      From       Treasury Shareholders' 
                                                  Paid-in Capital     Stage       Securities   Shareholder    Stock     Deficit    
                                                  ---------------  ------------   ------------  -----------   --------- -----------
<S>                                               <C>              <C>           <C>          <C>            <C>         <C>
1984: 
Initial issuance for cash  ....................     $   23,660     $        --    $     --     $      --     $     --     $ 24,500 
Initial issuance in exchange for legal fees  ..          8,450              --          --            --           --        8,750 
Initial issuance in exchange for services and 
  research and development costs ..............         (9,955)             --          --            --           --          905 
1985: 
Issuance for cash  ............................         83,980              --          --            --           --       85,000 
Issuance in exchange for professional fees, 
  salaries, and research services .............          8,892              --          --            --           --        9,000 
1986: 
Issuance in exchange for professional fees, 
  salaries, and services ......................         18,772              --          --            --           --       19,000 
Treasury stock purchase, 11,040 shares at cost              --              --          --            --      (22,500)     (22,500) 
Issuance for cash  ............................        154,626              --          --            --           --      156,450 
Issuance in exchange for professional fees, 
  salaries, and research services .............         15,660              --          --            --           --       15,850 
1987: 
Issuance for cash  ............................        445,974              --          --            --           --      449,070 
Treasury stock purchase, 2,400 shares at cost               --              --          --            --       (3,500)      (3,500) 
1988: 
Issuance for cash  ............................        225,613              --          --            --           --      226,823 
1989: 
Issuance for cash  ............................          5,324              --          --            --           --        5,350 
Issuance for cash  ............................        567,093              --          --            --           --      569,370 
1990: 
Issuance for cash  ............................      1,108,634              --          --            --           --    1,114,560 
Issuance for cash  ............................        723,260              --          --            --           --      725,000 
Issuance in exchange for note receivable from 
  shareholder .................................        135,805              --          --      (136,350)          --          -- 
1991: 
Repayment of note receivable from shareholder               --              --          --       136,350           --      136,350 
Net loss cumulative from June 25, 1984 
  (inception) through December 31, 1991 .......             --      (3,901,236)         --            --           --   (3,901,236) 
1992: 
Net loss for year ended December 31, 1992  ....             --        (505,558)         --            --           --     (505,558) 
                                                  --------------   ------------  -----------   -----------   ---------  -----------
Balance at December 31, 1992  .................      3,515,788      (4,406,794)         --            --      (26,000)    (886,816) 
1993: 
Net loss for year ended December 31, 1993  ....             --        (108,363)         --            --           --     (108,363) 
                                                  --------------   ------------  -----------   -----------   ---------  -----------
Balance at December 31, 1993  .................      3,515,788      (4,515,157)         --            --      (26,000)    (995,179) 
1994: 
Net loss for year ended December 31, 1994  ....             --        (129,239)         --            --           --     (129,239) 
Adjustment to unrealized losses on marketable 
  securities ..................................             --              --     (57,316)           --           --      (57,316) 
                                                  --------------   ------------  -----------   -----------   --------- ------------
Balance at December 31, 1994  .................      3,515,788      (4,644,396)    (57,316)           --      (26,000)  (1,181,734) 
1995: 
Issuance for stock grant  .....................         73,803              --          --            --           --       74,100 
Net loss for year ended December 31, 1995  ....             --        (311,579)         --            --           --     (311,579) 
Adjustment to unrealized losses on marketable 
  securities ..................................             --              --      57,316            --           --       57,316 
                                                  --------------   ------------  -----------   -----------   --------- ------------
Balance at December 31, 1995  .................      3,589,591      (4,955,975)         --            --      (26,000)  (1,361,897) 
1996: 
Net income for three months ended March 31, 
  1996 (unaudited) ............................             --          12,807          --            --           --       12,807 
Adjustment to unrealized gain on marketable 
  securities (unaudited) ......................             --              --      30,000            --           --       30,000 
                                                  --------------   ------------  -----------   -----------   --------- ------------
Balance at March 31, 1996 (unaudited)  ........     $3,589,591     $(4,943,168)   $ 30,000     $      --     $(26,000) $(1,319,090) 
                                                  ==============   ============  ===========   ===========   ========= ============ 
    
</TABLE>

See accompanying notes. 

                                       F-5
<PAGE>

                 AMARILLO BIOSCIENCES, INC. AND SUBSIDIARIES 
                     (COMPANIES IN THE DEVELOPMENT STAGE) 
                    CONSOLIDATED STATEMENTS OF CASH FLOWS 


   
<TABLE>
<CAPTION>
                                                                                                                       Cumulative 
                                                                                                                          from 
                                                                                                                        June 25, 
                                                                                                                          1984 
                                                                                                                      (Inception) 
                                                               Year ended                  Three months ended           through 
                                                      December 31,     December 31,      March 31,     March 31,       March 31, 
                                                          1994             1995            1995           1996            1996 
                                                     --------------   --------------    ------------   -----------   ------------- 
                                                                                        (Unaudited)   (Unaudited)     (Unaudited) 
   
<S>                                                  <C>        <C>                     <C>           <C>            <C>
Operating Activities 
Net income (loss)  ...............................    $   (129,239)    $   (311,579)     $  (74,934)   $   12,807     $(4,943,168) 
Adjustments to reconcile net income (loss) to net cash 
  used in operating activities: 
     Depreciation and amortization  ..............         29,282           23,652           6,387          5,110         204,830 
   
     Discount on investment in ISI  ..............             --          150,000              --             --         150,000 
   
     Recognition of deferred sublicense fees  ....             --               --              --             --         (32,844) 
     Organization costs  .........................             --               --              --             --          (9,953) 
     Gain on sale of equipment, net  .............             --               --              --             --          (8,375) 
     Common stock issued for stock grant  ........             --           74,100          74,100             --          74,100 
   
     Common stock issued for services  ...........             --               --              --             --          53,505 
   
     Changes in operating assets and liabilities: 
          Other current assets  ..................        (26,323)           5,000         (12,983)        10,166         (16,229) 
          Accounts payable  ......................         25,692            7,282         (82,643)       (48,099)        100,175 
   
          Accrued expenses  ......................        246,926           98,126         (20,634)        40,810         628,353 
   
          Deferred contract revenue  .............       (980,092)      (1,361,395)       (618,266)      (402,574)         14,566 
   
                                                     --------------   --------------    ------------   ----------- -------------- 
Net cash used in operating activities  ...........       (833,754)      (1,314,814)       (728,973)      (381,780)     (3,785,040) 
Investing Activities 
Sale (purchase) of marketable securities  ........     (1,999,336)       1,999,336              --             --              -- 
   
Capital expenditures  ............................         (2,468)              --              --         (2,467)       (253,442) 
Proceeds from the sale of equipment  .............             --               --              --             --          13,445 
   
Purchase of patent license  ......................             --               --              --             --        (125,000) 
Investment in ISI  ...............................             --         (625,000)             --             --        (625,000) 
Deposits  ........................................        (85,000)          85,000              --             --              -- 
                                                     --------------   --------------    ------------   -----------  -------------- 
Net cash provided by (used in) investing 
   activities ....................................     (2,086,804)       1,459,336              --         (2,467)       (989,997) 
Financing Activities 
Receipt of sublicense fees  ......................    $        --      $        --       $      --     $       --     $    32,844 
   
Proceeds from notes payable  .....................             --               --              --             --       2,000,000 
   
Repayment of note receivable from shareholder for 
   purchase of common stock ......................             --               --              --             --         136,350 
   
Issuance of common stock  ........................             --               --              --             --       3,356,123 
   
Acquisition of treasury stock  ...................             --               --              --             --         (26,000) 
                                                     --------------   --------------    ------------   -----------   ------------- 
Net cash provided by financing activities  .......             --               --              --             --       5,499,317 
   
                                                     --------------   --------------    ------------   -----------  -------------- 
Net increase (decrease) in cash and cash 
   equivalents ...................................     (2,920,558)         144,522        (728,973)      (384,247)        724,280 
   
Cash and cash equivalents at beginning of period .      3,884,563          964,005         964,005      1,108,527              -- 
                                                     --------------   --------------    ------------   -----------  ------------- 
Cash and cash equivalents at end of period  ......    $   964,005      $ 1,108,527       $ 235,032     $  724,280     $   724,280 
                                                     ==============   ==============    ============   ===========  ============== 
Supplemental Disclosure of Cash Flow 
   Information 
Cash paid for income taxes  ......................    $     7,084      $        --       $      --     $       --     $    37,084 
                                                     ==============   ==============    ============   =========== ============== 
    
</TABLE>

See accompanying notes. 

                                       F-6
<PAGE>

                 AMARILLO BIOSCIENCES, INC. AND SUBSIDIARIES 
                     (COMPANIES IN THE DEVELOPMENT STAGE) 
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES 

Organization 

   
   Amarillo Biosciences, Inc. (the Company), formerly Amarillo Cell Culture 
Company, Inc. (Note 13), is a development stage company incorporated on June 
25, 1984, for the purpose of developing and marketing, within the United 
States and internationally, eleven patents and eight pending applications 
relating to low dosage oral and non-oral natural interferon alpha used in the 
treatment of human and animal diseases. The Company has obtained certain 
patent rights through licensing agreements (see Note 5) and is currently 
conducting clinical studies as part of the process of obtaining regulatory 
approval from the United States Food and Drug Administration (FDA), so that 
commercial marketing can begin in the United States. 
    

   The Company's viability is dependent upon successful commercialization of 
products resulting from its research and product development activities. All 
of the Company's products will require significant additional development, 
laboratory and clinical testing and investment prior to obtaining regulatory 
approval to commercially market its product(s). Accordingly, for at least the 
next few years, the Company will continue to incur research and development 
and general and administrative expenses and likely will not generate 
sufficient revenues from product sales to support its operations. 

   The Company has been dependent upon financing from its shareholders. The 
Company's development- stage-through-1991 activities were financed primarily 
through the issuance of common stock. Since 1991, such activities have been 
financed under agreements (described in Note 4) with a major shareholder. The 
Company anticipates, based on its currently proposed plans and expectations 
relating to its operations (including expectations regarding the progress of 
its research and development and the timing and costs associated therewith), 
that its existing capital resources together with the proceeds from a 
$1,000,000 loan expected from a major shareholder, will be sufficient to 
satisfy the Company's estimated cash requirements through December 31, 1996. 
However, the Company estimates that an aggregate of $11,100,000 will be 
needed over the next three years to complete its primary research and 
development projects. 

   The Company has no current arrangements with respect to further sources of 
financing and there can be no assurance that any of its officers, directors 
or shareholders (including the major shareholder) will provide any portion of 
the Company's future financing requirements. The possible inability to obtain 
further financing would have a material adverse effect on the Company, 
including possibly requiring the Company to cease operations. 

Principles of Consolidation 

   The accompanying consolidated financial statements include the financial 
statements of the Company and its wholly-owned subsidiaries, Amarillo Cell of 
Canada, Inc. (a Texas corporation), Veldona Africa, Inc. (a Texas 
corporation), Veldona, Inc. (A Canada corporation), Veldona Poland, Inc., 
Veldona USA, Inc. and Vanguard Biosciences, Inc. (Texas corporations). All 
significant intercompany balances and transactions have been eliminated in 
consolidation. The effect of translation of foreign currencies is not 
material. 

Marketable Securities 

   Marketable securities are classified as available-for-sale. 
Available-for-sale securities are carried at fair value, with any unrealized 
gain or loss reported as a separate component of shareholders' equity. 

Cash and Cash Equivalents 

   The Company considers all highly liquid investments with a maturity of 
three months or less when purchased to be cash equivalents. 

                                       F-7
<PAGE>

                 Amarillo Biosciences, Inc. and Subsidiaries 
                     (companies in the development stage) 
          Notes to Consolidated Financial Statements  - (Continued) 

1. Organization and Summary of Significant Accounting Policies  - (Continued) 

Property and Equipment 

   Property and equipment are stated at cost. Depreciation is calculated 
using methods that approximate the declining balance method over the 
estimated useful lives of the assets. 

Patent License 

   The patent license represents payments made under one of the license 
agreements described in Note 5. The agreement remains in effect over the life 
of the underlying patents. Accordingly, the patent license fee is being 
amortized over 17 years using the straight-line method. 

Organizational Costs 

   Organizational costs are amortized using the straight-line method over 
five years. 

Income Taxes 

   The Company files a consolidated income tax return with its domestic 
subsidiaries, Amarillo Cell of Canada, Inc., Veldona Africa, Inc., Veldona 
Poland, Inc., Veldona USA, Inc., and Vanguard Biosciences, Inc. Veldona, Inc. 
files a separate income tax return in Canada. 

   On January 1, 1993, the Company changed its method of accounting for 
income taxes from the deferred method to the liability method required by 
Statement of Financial Accounting Standards No. 109, "Accounting for Income 
Taxes" (Statement No. 109). As permitted by the new rules, prior years' 
financial statements have not been restated. The effect of adopting Statement 
No. 109 was not material. 

Revenue Recognition 

   Contract revenue for research and development performed under the 
manufacturing and supply agreement with Hayashibara Biochemical Laboratories, 
Inc. (HBL) (see Note 4) is recorded as earned based on research and 
administrative costs incurred. Amounts received in advance of services to be 
performed are recorded as deferred revenue until expenses are incurred. 

Research and Development 

   Research and development costs are expensed as incurred. 

Use of Estimates 

   The preparation of financial statements in conformity with generally 
accepted accounting principles requires management to make estimates and 
assumptions that affect the reported amounts of assets and liabilities and 
disclosure of contingent assets and liabilities at the date of the financial 
statements and the reported amounts of revenues and expenses during the 
reporting period. Actual results could differ from those estimates. 

Stock Split 

   In May 1993, the Company approved a ten-for-one stock split for all issued 
and outstanding shares. As described in Note 13, during 1996 a six-for-five 
stock split was effected. All references to common stock and per share data 
have been restated to give effect to these splits. 

                                       F-8
<PAGE>

                 Amarillo Biosciences, Inc. and Subsidiaries 
                     (companies in the development stage) 
            Notes to Consolidated Financial Statements -- (Continued)

2. PROPERTY AND EQUIPMENT 

   Property and equipment are stated at cost and consist of the following: 

<TABLE>
<CAPTION>
                                                                December 31, 
                                                                    1995 
                                                                -------------- 
<S>                                                              <C>
Land  ....................................................         $  8,000 
Building  ................................................           94,532 
Furniture and equipment  .................................          114,354 
                                                                -------------- 
                                                                    216,886 
Less accumulated depreciation ............................          102,293 
                                                                -------------- 
                                                                   $114,593 
                                                                ============== 
</TABLE>

   
3. NOTES PAYABLE 
    

   In September 1991, the Company borrowed $1,000,000 under a note payable 
agreement with HBL. In September 1992, the Company borrowed an additional 
$1,000,000 under a similar note agreement with HBL. The unsecured notes 
accrue interest at a rate of 6%, and the entire principal and interest is due 
on September 16, 1996 and September 25, 1997, respectively, provided that the 
principal and accrued interest be paid only from 10% of the Company's gross 
revenues from sales of interferon. All payments are to be applied first to 
accrued interest. As repayment of the notes is dependent on future sales, 
management is unable to estimate the fair value of the notes at December 31, 
1995. Because material amounts of sales are not expected in the next twelve 
months, the notes continue to be classified as non-current liabilities. 

4. MANUFACTURING AND SUPPLY AGREEMENTS 

   The Company was a party to the following manufacturing and supply 
agreements at December 31, 1995: 

   On March 13, 1992, the Company entered into a Joint Development and 
Manufacturing/ Supply Agreement with HBL (the "Development Agreement"), a 
major shareholder (see Note 7), under which HBL will formulate, manufacture, 
and supply HBL interferon for the Company or any sublicensee. In exchange, 
HBL is entitled to receive a transfer fee, specified royalties and a portion 
of any payment received by the Company for sublicense of rights under this 
agreement. The agreement further provides that the Company sublicense to HBL 
the right to market HBL interferon for oral use in humans and in nonhuman, 
warm-blooded species in Japan, in exchange for the Company receiving a 
royalty fee based on net sales. On June 1, 1994, HBL entered into an 
additional agreement with HBL to make the Company HBL's exclusive agent for 
the development of HBL interferon for non-oral use in humans and in nonhuman, 
warm-blooded species in North America. In exchange, HBL is entitled to 
receive a transfer fee based on units of interferon supplied. 

   
   Under the Development Agreement, HBL has provided $9,000,000 in research 
funding to the Company as follows: $3,500,000 in 1992, $4,000,000 in 1993, 
and $1,500,000 in 1994. Costs incurred under the Development Agreement 
amounted to $2,480,093 and $1,361,395 in the years ended December 31, 1994 
and 1995, respectively, $618,266 and $402,574 in the three months ended March 
31, 1995 and 1996 (unaudited), respectively, and $8,985,434 cumulative from 
June 25, 1984 (inception) through March 31, 1996 (unaudited). The agreement 
also provides that a royalty fee be paid to HBL. The initial term of the 
agreement is for seven years, but will be renewed automatically for 
successive three-year terms subject to prior written agreement. HBL can 
terminate the agreement at any time after the end of the first renewal term 
if certain conditions are not met. 
    

   On October 20, 1989, the Company entered into a manufacturing and supply 
agreement with Interferon Sciences, Inc. (ISI), a 2% shareholder of the 
Company, under which ISI will manufacture and utilize ISI interferon to 
formulate and supply interferon-containing compositions to the Company for 
use in nonhuman species. Under the Agreement, ISI is entitled to receive 
certain transfer fees, manufacturing and supply fees, and a portion of any 
payments received by the Company related to the use of ISI interferon. The 
initial five-year term of the agreement has been extended to October 20, 
1996, and may be terminated or further extended if certain conditions are 
met. 

                                      F-9
<PAGE>

                 Amarillo Biosciences, Inc. and Subsidiaries 
                     (companies in the development stage) 
          Notes to Consolidated Financial Statements  - (Continued) 

4. Manufacturing and Supply Agreements  - (Continued) 

   On October 1, 1991, Veldona, Inc. entered into an agreement with a 
Canadian pharmaceutical firm which is to manufacture interferon tablets. As 
of December 31, 1995, minimum purchase requirements have not been established 
pending completion of validation trials. If the agreement is terminated, 
Veldona, Inc. is required to purchase any finished product, raw materials, or 
packaging components in possession of the manufacturer. The agreement is 
effective until December 31, 1996, with one year renewal options beyond that 
date. 

5. LICENSE AND SUBLICENSE AGREEMENTS 

   The Company holds patent rights for which the Company has paid certain 
license fees under three license agreements. Under these agreements, the 
Company will pay the licensor a portion of any sublicense fee received by the 
Company with respect to the manufacturing, use or sale of a licensed product, 
as well as a royalty fee based on the net selling price of licensed products, 
subject to a minimum annual royalty. 

   The Company has also entered into various sublicense agreements under 
which the Company is entitled to receive royalties based on the net sales 
value of licensed products. 

6. RESEARCH AGREEMENTS 

   The Company contracts with third parties throughout the world to conduct 
research, including studies and clinical trials. These agreements are 
generally less than one year in duration. At December 31, 1995, the Company 
had commitments to provide additional funding of approximately $76,000 under 
these agreements. 

7. COMMON STOCK 

   In May 1993, the shareholders of the Company approved an amendment to the 
Articles of Incorporation to increase the total number of authorized shares 
of common stock of the Company from one million shares to ten million shares. 
The shareholders also approved a ten-for-one stock split for the currently 
issued and outstanding shares of the Company. 

   Since 1984, the Company has issued common stock in exchange for various 
professional, research, and consulting services. The stock issued for noncash 
consideration was assigned a value based on the fair value of the services 
received. 

   In December 1989, the Company issued 218,400 shares of stock to HBL for 
$2.50 per share. In February 1990, an additional 174,000 shares were issued 
to HBL for $4.17 per share, and in November 1990, an additional 69,120 shares 
were issued to HBL for $2.50 per share. These shares, combined with purchases 
from various other shareholders, give HBL control of 34% of the outstanding 
common stock, or 1,032,756 shares at December 31, 1995. 

   In July 1992, the Board of Directors approved restricted stock grants to 
three employees which would allow the Company to issue, under certain 
conditions, up to 180,000 shares of its authorized but unissued shares of 
common stock. In May 1994, the Board of Directors approved restricted stock 
grants to an additional employee which would allow the Company to issue, 
under certain conditions, up to 30,000 shares of its authorized but unissued 
shares of common stock. In January 1995, 29,640 shares of common stock (net 
of required federal withholdings of 12,360 shares) were issued to a former 
employee under a Contract Termination and Severance Agreement. The issuance 
and withholding were in full satisfaction of the employee's original 84,000 
shares in stock grants. 

   
   Under a stock purchase agreement with a shareholder, Mesa, Inc. (Mesa), 
the Company is prohibited from repurchasing or redeeming any of its issued 
and outstanding shares without the prior written approval of Mesa unless such 
redemption or repurchase is offered pro rata to all shareholders. 
    

                                      F-10
<PAGE>

                 Amarillo Biosciences, Inc. and Subsidiaries 
                     (companies in the development stage) 
            Notes to Consolidated Financial Statements - (Continued)

8. EMPLOYEE BENEFIT PLAN 

   The Company discontinued a defined contribution retirement plan for 
eligible employees in August 1995. Profit sharing expense for the years ended 
December 31, 1994 and 1995, and cumulative from June 25, 1984 (inception) 
through March 31, 1996 was approximately $0, $0, and $154,500, respectively. 

9. INCOME TAXES 

   Deferred income taxes reflect the net tax effects of temporary differences 
between the carrying amounts of assets and liabilities for financial 
reporting purposes and the amounts used for income tax reporting purposes. 
Significant components of the Company's deferred tax liabilities and assets 
are as follows at December 31, 1995: 

<TABLE>
<CAPTION>
<S>                                                              <C>
 Deferred tax liabilities: 
  Prepaid expenses  ...................................          $     8,975 
                                                                 ------------- 
Total deferred tax liabilities  .......................                8,975 
Deferred tax assets: 
     Net operating loss and AMT carryforwards  ........            1,277,286 
     Accrued interest  ................................              154,258 
     Depreciation and amortization  ...................               59,192 
     Deferred revenue  ................................              141,828 
     Accrued stock grants  ............................               39,047 
     Other  ...........................................               56,873 
                                                                 ------------- 
                                                                   1,728,484 
Valuation allowance for deferred tax assets  ..........           (1,719,509) 
                                                                 ------------- 
Total deferred tax assets, net of valuation allowance .                8,975 
                                                                 ------------- 
Net deferred taxes  ...................................          $         -- 
                                                                 ============= 

</TABLE>

   At December 31, 1995, the Company has net operating loss carryforwards of 
approximately $3,292,000 for federal income tax purposes expiring in 2006 
through 2010. The ability of the Company to utilize these carryforwards may 
be limited should changes in shareholder ownership occur in the future. 

   At December 31, 1995, the Company had approximately $36,000 of alternative 
minimum tax credits which may be carried forward indefinitely. 

   The difference between the reported income tax provision and the benefit 
normally expected by applying the statutory rate to the loss before income 
taxes results primarily from the inability of the Company to recognize its 
tax losses. 

10. CONTINGENCIES 

   
   Hoffmann La-Roche, Inc. ("Roche") has asserted to HBL that the 
manufacture, sale and use of its form of IFN|ga infringes United States Patent 
4,503,035 and foreign counterparts thereof owned by Roche relating to IFN|ga 
(collectively, the "Roche Patent"). The Roche Patent expires in March 2002 in 
the United States and at various times in other jurisdictions. HBL has 
informed the Company that it believes that the claims of the Roche Patent are 
not applicable to the manufacture and sale of HBL IFN|ga . HBL has prevailed at 
the trial level in litigation initiated by Roche in Japan concerning the 
dispute and Roche has appealed the decision. The Company is not a party to 
the litigation between Roche and HBL in Japan. 
    

   The Company is not a party to any litigation related to these issues; 
however, there is a possibility of litigation against the Company regarding 
these matters at some point in the future. Management of the Company believes 
that litigation which might result from these disputes will not have an 
adverse effect on current opera 

                                      F-11
<PAGE>

                 Amarillo Biosciences, Inc. and Subsidiaries 
                     (companies in the development stage) 
          Notes to Consolidated Financial Statements  - (Continued) 

10. Contingencies  - (Continued) 

tions, as the Company is not currently selling or attempting to sell HBL 
interferon in any country where Roche has a patent. However, since the 
Company currently has no interferons under license except ISI interferon and 
HBL interferon, an ultimate determination adverse to the Company could impact 
future expansion of the Company's sales. 

11. RELATED PARTY TRANSACTIONS 

   In the ordinary course of business, the Company has and expects to have 
transactions with related parties, including shareholders. In addition to the 
transactions disclosed elsewhere in these financial statements, such related 
party transactions included legal fees of approximately $50,400 and $68,700 
paid to Morris, Moore, Moss and Douglass, P.C., a member of which is an 
officer and shareholder of the Company, in 1994 and 1995, respectively. The 
Company also employs various shareholders as researchers and consultants and 
pays fees based on contractual agreements. 

12. SETTLEMENT OF LITIGATION 

   Commencing in 1993, the Company was the plaintiff in litigation involving 
a patent infringement action in New Zealand. In May 1995, a settlement was 
reached whereby the Company: (1) amended its manufacturing and supply 
agreement with ISI to allow the sublicense of certain products previously 
exclusively licensed to ISI and purchased 312,500 shares of ISI common stock 
for $625,000, or $2 per share, representing the quoted market price of ISI 
stock at that time; and (2) received $550,000 cash from the defendant in the 
lawsuit, comprising $50,000 in exchange for a sublicense of the technology 
that was the subject of the lawsuit and $500,000 as a payment toward research 
and development costs incurred by the Company. 

   As a result of restrictions on the sale by the Company of its ISI stock 
until May 1997, the Company has discounted the ISI stock (quoted price of 
$1.875 per share at December 31, 1995) to a carrying value of $475,000 at 
December 31, 1995, and as a result charged $150,000 to selling, general, and 
administrative expenses. The ISI stock is classified as available-for-sale. 
The $500,000 contribution toward research and development costs has been 
recorded as other revenue in 1995. 

13. SUBSEQUENT EVENTS 

   On May 14, 1996, the shareholders of the Company approved a name change 
from Amarillo Cell Culture Company, Inc. to Amarillo Biosciences, Inc. and 
approved a six-for-five stock split to be effected through a 20% stock 
dividend on the issued and outstanding shares of the Company at the record 
date of April 16, 1996. All references to common stock and per share data 
have been restated to give effect to the split. 

   During May 1996, the Company executed two notes with HBL under which it 
expects to borrow $500,000 on May 31, 1996 and $500,000 on June 28, 1996. The 
notes bear interest at 4% per annum and mature one year after the borrowing 
date. If the Company successfully consummates an initial public offering, the 
notes are payable in full from the proceeds of such offering. 

14. UNAUDITED INFORMATION 

   The unaudited interim financial statements have been prepared pursuant to 
the rules and regulations of the Securities and Exchange Commission. Certain 
information and note disclosures normally included in annual financial 
statements prepared in accordance with generally accepted accounting 
principles have been condensed or omitted pursuant to those rules and 
regulations, although the Company believes that the disclosures made are 
adequate to make the information presented not misleading. The unaudited 
interim financial statements reflect, in the opinion of management, all 
adjustments (which include only normal recurring adjustments) necessary to 
fairly present the financial position, results of operations, and cash flows 
as of and for the periods presented. The unaudited interim financial 
information should be read in conjunction with the audited financial 
statements and related notes thereto. The results for the interim periods 
presented are not necessarily indicative of results to be expected for the 
full year. 

                                      F-12
<PAGE>
==============================================================================

No dealer, salesperson or any other individual has been authorized to give 
any information or to make any representation not contained in this 
Prospectus in connection with the offer made by this Prospectus and, if given 
or made, such information or representation must not be relied upon as having 
been authorized by the Company or the Underwriter. This Prospectus does not 
constitute an offer to sell, or a solicitation of an offer to buy, any 
securities other than the securities offered by this Prospectus, or an offer 
to sell or a solicitation of an offer to buy any security by any person in 
any jurisdiction in which such offer or solicitation is unlawful. Neither the 
delivery of this Prospectus nor any sale made hereunder shall, under any 
circumstances, imply that the information in this Prospectus is correct as of 
any time subsequent to the date of this Prospectus. 

                                    ------ 

   
                              TABLE OF CONTENTS 
                                                        Page 
                                                       -------- 
Prospectus Summary  ........................               3 
Risk Factors  ..............................               6 
Use of Proceeds  ...........................              15 
Dividend Policy  ...........................              16 
Dilution  ..................................              17 
Capitalization  ............................              18 
Selected Financial Data  ...................              19 
Management's Discussion and Analysis of 
  Financial Condition and Results of Operations           20 
Business  ..................................              22 
Management  ................................              34 
Principal Shareholders  ....................              40 
Certain Transactions  ......................              41 
Description of Common Stock ................              42 
Shares Eligible for Future Sale  ...........              42 
Underwriting  ..............................              43 
Legal Matters  .............................              44 
Experts  ...................................              45 
Additional Information  ....................              45 
Glossary  ..................................              46 
Index to Financial Statements  .............             F-1 
    

   Until       , 1996 (25 days after the date of this Prospectus), all 
dealers effecting transactions in the registered securities, whether or not 
participating in this distribution, may be required to deliver a Prospectus. 
This is in addition to the obligation of dealers to deliver a Prospectus when 
acting as underwriters and with respect to their unsold allotments or 
subscriptions. 

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

                              


                                2,000,000 SHARES




                          AMARILLO BIOSCIENCES, INC




                                    [LOGO] 



                                 COMMON STOCK 




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




                          WHALE SECURITIES CO., L.P. 





                                       , 1996 

==============================================================================
<PAGE>
                                   PART II 

INFORMATION NOT REQUIRED IN PROSPECTUS 

ITEM 24. INDEMNIFICATION OF DIRECTORS AND OFFICERS. 

   Article 2.02-1 of the Texas Business Corporation Act (the "Texas 
Corporation Law") empowers a Texas corporation to indemnify any person who 
was, is or is threatened to be made a named defendant or respondent in any 
threatened, pending or completed action, suit or proceeding, whether civil, 
criminal, administrative, arbitrative or investigative, any appeal in any 
such action, suit or proceeding and any inquiry or investigation that could 
lead to such an action, suit or proceeding (individually, a "Proceeding") by 
reason of the fact that he 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, partner, venturer, proprietor, trustee, employee, agent 
or similar functionary of another foreign or domestic corporation, 
partnership, joint venture, sole proprietorship, trust or other enterprise, 
against reasonable expenses (including court costs and attorneys' fees), 
judgments, penalties (including excise and similar taxes), fines and amounts 
paid in settlement actually incurred by him in connection with such 
Proceeding if he conducted himself in good faith and in a manner he 
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 his conduct was unlawful. The termination of any 
Proceeding by judgment, order, settlement, conviction, or upon plea of nolo 
contendere, or its equivalent, is not, of itself, determinative that the 
person did not act in good faith and in a manner which he 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 reasonable cause to believe 
that his conduct was lawful. 

   A person may be indemnified in respect of a Proceeding (a) in which the 
person is found liable on the basis that personal benefit was improperly 
received by him whether or not the benefit resulted from an action taken in 
the person's official capacity or (b) in which the person is found liable to 
the corporation. However, indemnification in the foregoing circumstances is 
limited to reasonable expenses actually incurred by the person in connection 
with the Proceeding. In no event shall any indemnification be made in respect 
of a Proceeding in which the person shall have been liable for willful or 
intentional misconduct in the performance of his duty to the corporation. A 
person shall be deemed to have been found liable in respect of any claim, 
issue or matter only after the person shall have been so adjudged by a court 
of competent jurisdiction after exhaustion of all appeals therefrom. 

   
   Reasonable expenses incurred by a director, officer, employee or agent of 
a Texas corporation who was, is, or is threatened to be made a named 
defendant or respondent in a Proceeding may be paid or reimbursed by the 
corporation, in advance of the final disposition of the Proceeding, after the 
corporation receives a written affirmation by the director of his good faith 
belief that he has met the standard of conduct necessary for indemnification 
under the Texas Corporation Law and a written undertaking by or on behalf of 
the person to repay the amount paid or reimbursed if it is ultimately 
determined that he has not met that standard or if it is ultimately 
determined that indemnification of the person against expenses incurred by 
him in connection with that Proceeding is prohibited by the Texas Corporation 
Law. 
    

   If, upon application of a person, a court of competent jurisdiction 
determines, after giving any notice the court considers necessary, that the 
person is fairly and reasonably entitled to indemnification in view of all 
the relevant circumstances, the court may order the indemnification that the 
court determines is proper and equitable. 

   Article 2.02-1 of the Texas Corporation Law further provides that, subject 
to restrictions on the circumstances in which indemnification is required 
which may be set forth in the corporation's articles of incorporation, a 
Texas corporation is required to indemnify a director or officer against 
reasonable expenses incurred by him in connection with any Proceeding in 
which he is a named defendant or respondent because he is or was a director 
or officer, if he has been successful on the merits or otherwise in the 
defense of the Proceeding; that a corporation may also, consistent with law, 
indemnify and advance expenses to persons as may be provided in the 
corporation's articles of incorporation, bylaws or by general or specific 
action of the corporation's board of directors, or contract or as permitted 
or required under common law; and empowers the corporation to purchase and 
maintain insurance or another arrangement on behalf of any person who is or 
was a director, officer, 

                                      II-1
<PAGE>

employee or agent of the corporation or who is or was serving at the request 
of the corporation as a director, officer, partner, venturer, proprietor, 
trustee, employee, agent, or similar functionary of another domestic or 
foreign corporation, partnership, joint venture, sole proprietorship, trust, 
employee benefit plan, or any other enterprise against any such liability 
asserted against him and incurred by him in any such capacity or arising out 
of his status as such whether or not the corporation would have the power to 
indemnify him against liability under Article 2.02-1. A Texas corporation may 
provide indemnification only as authorized in the specific case upon a 
determination that person has met the applicable standard of conduct. Such 
determination is to be made (i) by the members of the board of directors by a 
majority vote of a quorum consisting of directors who were not named 
defendants or respondents in the Proceeding, or (ii) if such a quorum is not 
obtainable, by a majority vote of a committee of the board of directors 
designated to act in the matter by a majority vote of all directors, 
consisting solely of two or more directors who are not named defendants or 
respondents in the Proceeding or (iii) by special legal counsel selected by 
the board of directors or a committee thereof. 

   Article IV of the By-Laws of the Company also provides for indemnification 
of current or former directors and officers of the Company and any person who 
has served at the request of the Company as a director or officer of another 
corporation in which the Company owns shares of capital stock or of which it 
is a creditor against liabilities imposed upon him and expenses reasonably 
incurred by him in connection with any claim made against him, or any action, 
suit or proceeding to which he may be a party by reason of his being or 
having been such director or officer; provided that no director or officer 
shall be indemnified with respect to matters as to which he shall be adjudged 
liable for negligence or misconduct in performance of his duty or with 
respect to matters for which such indemnification could be against public 
policy. Indemnification of such a person is also authorized against such sums 
as independent legal counsel selected by the board of directors shall deem 
reasonable payment in settlement of claims primarily with a view of avoiding 
expenses of litigation. 

   The Company has entered into indemnification agreements with each of its 
directors and executive officers whereby the Company will, in general, 
indemnify such directors and executive officers, to the extent permitted by 
the Company's Certificate of Incorporation or the laws of the State of Texas, 
against any expenses (including attorneys' fees), judgments, fines and 
amounts paid in settlement incurred in connection with any actual or 
threatened action or proceeding to which such director or officer is made or 
threatened to be made a party by reason of the fact that such person is or 
was a director or officer of the Company. 

   The Company has obtained liability insurance for each director and officer 
for certain losses arising from claims or charges made against them while 
acting in their capacities as directors or officers of the Company. 

   The Underwriting Agreement, which is filed as Exhibit 1.1, provides for 
indemnification of the directors and certain officers of the Company by the 
Underwriter against certain civil liabilities, including liabilities under 
the Securities Act of 1933. 

   Effective upon the consummation of the offering made pursuant to this 
Registration Statement, HBL has agreed to indemnify the Company and its 
officers and directors for litigation expenses, losses, damages and amounts 
paid in settlement arising out of litigation which may be brought by Roche or 
its affiliates relating to the Roche Patent. 

                                      II-2
<PAGE>

ITEM 25. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION. 

   The following table sets forth an itemized statement of all expenses in 
connection with the issuance and distribution of the securities being 
registered (all of which are estimated other than the filing fees of the 
Securities and Exchange Commission, NASDAQ and the National Association of 
Securities Dealers, Inc. and the consulting fee to the Underwriter), other 
than underwriting discounts and commissions and the Underwriter's 
non-accountable expense allowance: 

<TABLE>
<CAPTION>
<S>                                                                 <C>
   
Securities and Exchange Commission filing fee  ............        $   4,524 
NASDAQ fee  ...............................................         $  10,415 
National Association of Securities Dealers, Inc. filing fee         $   1,813 
Printing and engraving expenses  ..........................         $ 100,000 
Legal Fees and expenses  ..................................         $ 210,000 
Registrar and transfer agent fees  ........................         $   5,000 
Accounting fees and expenses  .............................         $  75,000 
Blue sky fees and expenses  ...............................         $  45,000 
Consulting fee to Underwriter  ............................         $  60,000 
Miscellaneous  ............................................         $  13,248 
                                                                    ---------- 
     Total  ...............................................         $525,000 
                                                                    ========== 
    

</TABLE>

   
ITEM 26. RECENT SALES OF UNREGISTERED SECURITIES. 
    

   On May 24, 1993 the Company issued 2,264,274 shares of Common Stock to 
effect a 10 for 1 stock split. The shares issued in the stock split did not 
require registration under the Securities Act in that the stock split was not 
a "sale," "offer for sale" or "offer" as such terms are defined in the 
Securities Act. 

   On January 12, 1995 the Company issued to a former employee 29,640 shares 
of Common Stock pursuant a Contract Termination and Severance Agreement 
between the Company and such person. The issuance was in consideration of the 
settlement of certain obligations of the Company to the employee. The 
employee did not pay any cash to the Company for the shares. All of the 
shares were issued pursuant to an exemption from the registration 
requirements of the Securities Act afforded by Section 4(2) of the Securities 
Act. 

   On May 6, 1996 the Company made a 20% stock dividend to all holders of 
record of its Common Stock as of April 16, 1996. The Company issued 505,872 
shares in connection with the stock dividend. The shares issued in the stock 
dividend did not require registration under the Securities Act in that the 
stock dividend was not a "sale," "offer for sale" or "offer" as such terms 
are defined in the Securities Act. 

   On the date this Registration Statement is declared effective by the 
Securities Exchange Commission the Company shall issue to Joseph Cummins, 
Alan Richards and Charles Hughes 30,000, 30,000 and 19,000 shares, 
respectively, of the Company's Common Stock in accordance with the terms of 
conditional stock grants awarded by the Company to Messrs. Cummins and 
Richards in July 1992 and Mr. Hughes in June 1994. All of the shares were 
issued pursuant to an exemption from the registration requirements of the 
Securities Act afforded by Section 4(2) of the Securities Act. 

                                      II-3
<PAGE>

ITEM 27. EXHIBITS 

<TABLE>
<CAPTION>
 Number      Description 
 -------     ----------------------------------------------------------------------------------------------- 
<S>           <C>
 **1.1       Form of Underwriting Agreement.                                                                                    
  *3.1       Restated Articles of Incorporation of the Company. 
  *3.2       Articles of Amendment of Restated Articles of Incorporation of the Company. 
  *3.3       Bylaws of the Company. 
 **4.1       Specimen Common Stock Certificate. 
 **4.2       Form of Underwriter's Warrant. 
 **5.1       Opinion of Lowenthal, Landau, Fischer & Bring, P.C. 
 *10.1       Agreement dated as of April 1, 1984 between University Patents, Inc. and the Company. 
 *10.2       License Agreement dated as of March 22, 1988 between the Company and The Texas A&M University System. 
 *10.3       License Agreement dated October 20, 1989 between the Company and ISI.*** 
 *10.4       Manufacturing and Supply Agreement dated October 20, 1989 between the Company and ISI.*** 
 *10.5       Joint Development and Manufacturing/Supply Agreement dated March 13, 1992 between the Company and 
             HBL, as amended.*** 
 *10.6       Amended and Restated Agreement dated as of November 24, 1992 between Mitsubishi and the Company. 
 *10.7       Japan Animal Health License Agreement dated January 20, 1993 between the Company and HBL.*** 
 *10.8       Employment Agreement dated as of March 4, 1994 between the Company and Dr. Alan B. Richards, as amended. 
 *10.9       Employment Agreement dated as of March 4, 1994 between the Company and Dr. Joseph M. Cummins, as 
             amended. 
 *10.10      Employment Agreement dated as of June 1, 1994 between the Company and Charles Hughes, as amended. 
 *10.11      Manufacturing/Supply Agreement dated June 1, 1994 between the Company and HBL. 
 *10.12      Settlement Agreement dated April 27, 1995 among the Company, ISI, Pharma Pacific Management Pty. 
             Ltd. ("PPM"), Pharma Pacific Pty. Ltd., Pharma Pacific Ltd., and Fernz Corporation Limited. 
 *10.13      Amendment of ACC/ISI License Agreement dated April 27, 1995 between the Company and ISI. 
 *10.14      PPM/ACC Sub-license Agreement dated April 27, 1995 between PPM and the Company.*** 
 *10.15      License and Supply Agreement dated July 10, 1995 between Veldona Africa, Inc. ("VAF") and Innovative 
             Therapeutics, Ltd. ("ITL").*** 
 *10.16      Pricing Amendment, dated December 5, 1995 between VAF and ITL.*** 
 *10.17      License Agreement dated September 25, 1995 between McGill University and the Company. 
 *10.18      Form of Consulting Agreement between the Company and the Underwriter. 
 *10.19      Research Agreement dated March 25, 1996 between the Company and Ajinomoto Co., Inc. 
 *10.20      1996 Employee Stock Option Plan 
 *10.21      1996 Outside Director and Advisor Stock Option Plan 
 *10.22      Form of Indemnification Agreement between the Company and officers and directors of the Company. 
**10.23      Indemnification Agreement between HBL and the Company. 
</TABLE>
       
                                      II-4
<PAGE>

<TABLE>
<CAPTION>
Number        Description 
- -------       ------------
<S>           <C>                                             
**10.24       Stock Purchase Agreement dated as of September 21, 1987 between Mesa Operating Limited Partnership 
              and the Company. 
**10.25       Research License and Supply Agreement dated May 20, 1996 between the Company and Virbac S.A. 
**23.1        Consent of Lowenthal, Landau, Fischer & Bring, P.C. (included in Exhibit 5.1). 
**23.2        Consent of Ernst & Young LLP 
 *24.1        Powers of Attorney (contained on signature page of Registration Statement). 

</TABLE>

   
- ------ 
  * Previously filed. 
 ** Filed herewith. 
*** Confidential treatment has been requested with respect to portions of 
    this document. Omitted portions have been filed separately with the 
    Securities and Exchange Commisssion. 
    

ITEM 28. UNDERTAKINGS. 

   The Company hereby undertakes that: it will file, during any period in 
which it offers or sells securities, a post-effective amendment to this 
Registration Statement to: 

       (a) Include any prospectus required under Section 10(a) of the 
   Securities Act; 
       (b) Reflect in the prospectus any facts or events which, individually 
   or together, represent a fundamental change in the information in this 
   Registration Statement. Notwithstanding the foregoing, any increase or 
   decrease in volume of securities offered (if the total dollar value of 
   securities offered would not exceed that which was registered) and any 
   deviation from the low or high end of the estimated maximum offering range 
   may be reflected in the form of prospectus filed with the Commission 
   pursuant to Rule 424(b) if, in the aggregate, the changes in volume and 
   price represent no more than a 20 percent change in the maximum aggregate 
   offering price set forth in the "Calculation of Registration Fee" table in 
   the effective registration statement; and 
       (c) Include any additional or changed material information on the plan 
   of distribution. 

   (2) For determining liability under the Securities Act, treat each 
post-effective amendment as a new registration statement of the securities 
offered, and the offering of the securities at that time to be the initial 
bona fide offering. 

   (3) File a post-effective amendment to remove from registration any of the 
securities that remain unsold at the end of the offering. 

   Insofar as indemnification for liabilities arising under the Securities 
Act may be permitted to directors, officers and controlling persons of the 
Company pursuant to the provisions described under Item 24 above, or 
otherwise, the Company 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 Company of expenses incurred or paid by a director, 
officer or controlling person of the Company in the successful defense of any 
action, suit or proceeding) is asserted against the Company by such director, 
officer or controlling person in connection with the securities being 
registered, the Company 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. 

   The Company hereby undertakes that (i) for purposes of determining 
liability under the Securities Act, the information omitted from the form of 
Prospectus filed as part of this Registration Statement in reliance upon Rule 
430A and contained in a form of Prospectus filed by the Company pursuant to 
Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to 
be a part of this Registration Statement as of the time it was 

                                      II-5
<PAGE>
   
declared effective; and (ii) for purposes of determining any liability under 
the Securities Act, each post-effective amendment that contains a form of 
Prospectus shall be deemed to be a new Registration Statement relating to the 
securities offered therein, and the offering of such securities at that time 
shall be deemed to be the initial bona fide offering thereof. 

   The Company will provide to the Underwriter at the closing specified in 
the Underwriting Agreement certificates in such denominations and registered 
in such names as required by the Underwriter to permit prompt delivery to 
each purchaser. 
    



























                                      II-6

<PAGE>

                                  SIGNATURES 

   
   In accordance with 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 SB-2 and authorized this amendment 
to the registration statement to be signed on its behalf by the undersigned, 
thereto duly authorized, in the City of Amarillo, State of Texas, on July 2, 
1996. 
                                               AMARILLO BIOSCIENCES, INC. 
                                               By: /s/ Joseph M. Cummins 

                                               ------------------------------- 
                                                  Joseph M. Cummins, 
                                                  Chairman of the Board 

   In accordance with the requirements of the Securities Act of 1933, this 
amendment to the registration statement has been signed by the following 
persons in the capacities and on the dates stated. 
    

<TABLE>
<CAPTION>
         Signature                               Title                             Date 
 -------------------------   ----------------------------------------------   -------------- 
 <S>                        <C>                                              <C>
  /s/ Joseph M. Cummins     Chairman of the Board and President              July 2, 1996 
  ------------------------  (Chief Executive Officer) and Director 
     Joseph M. Cummins 
             *              Vice President-Finance and Administration        July 2, 1996 
  ------------------------  and Treasurer (Chief Financial Officer and 
     Charles H. Hughes      Chief Accounting Officer) 
             *              Secretary                                        July 2, 1996 
  ------------------------ 
      Edward L. Morris 
             *              Director                                         July 2, 1996 
  ------------------------ 
        Stephen Chen 
             *              Director                                         July 2, 1996 
  ------------------------ 
    Katsuaki Hayashibara 
             *              Director                                         July 2, 1996 
  ------------------------ 
        Dennis Moore 
             *              Director                                         July 2, 1996 
  ------------------------ 
         James Page 
             *              Director                                         July 2, 1996 
  ------------------------ 
         James Cook 
  /s/ Joseph M. Cummins 
  ------------------------ 
     *Joseph M. Cummins 
      Attorney-in-fact 

</TABLE>


                                      II-7
                                
<PAGE>
                                  EXHIBIT INDEX

<TABLE>
<CAPTION>

 Number      Description 
 -------     ------------
<S>              <C>
 **1.1      Form of Underwriting Agreement.                                                                             
  *3.1      Restated Articles of Incorporation of the Company. 
  *3.2      Articles of Amendment of Restated Articles of Incorporation of the Company. 
  *3.3      Bylaws of the Company. 
 **4.1      Specimen Common Stock Certificate. 
 **4.2      Form of Underwriter's Warrant. 
 **5.1      Opinion of Lowenthal, Landau, Fischer & Bring, P.C. 
 *10.1      Agreement dated as of April 1, 1984 between University Patents, Inc. and the Company. 
 *10.2      License Agreement dated as of March 22, 1988 between the Company and The Texas A&M University System. 
 *10.3      License Agreement dated October 20, 1989 between the Company and ISI.*** 
 *10.4      Manufacturing and Supply Agreement dated October 20, 1989 between the Company and ISI.*** 
 *10.5      Joint Development and Manufacturing/Supply Agreement dated March 13, 1992 between the Company and 
            HBL, as amended.*** 
 *10.6      Amended and Restated Agreement dated as of November 24, 1992 between Mitsubishi and the Company. 
 *10.7      Japan Animal Health License Agreement dated January 20, 1993 between the Company and HBL.*** 
 *10.8      Employment Agreement dated as of March 4, 1994 between the Company and Dr. Alan B. Richards, as amended. 
 *10.9      Employment Agreement dated as of March 4, 1994 between the Company and Dr. Joseph M. Cummins, as 
            amended. 
 *10.10     Employment Agreement dated as of June 1, 1994 between the Company and Charles Hughes, as amended. 
 *10.11     Manufacturing/Supply Agreement dated June 1, 1994 between the Company and HBL. 
 *10.12     Settlement Agreement dated April 27, 1995 among the Company, ISI, Pharma Pacific Management Pty. 
            Ltd. ("PPM"), Pharma Pacific Pty. Ltd., Pharma Pacific Ltd., and Fernz Corporation Limited. 
 *10.13     Amendment of ACC/ISI License Agreement dated April 27, 1995 between the Company and ISI. 
 *10.14     PPM/ACC Sub-license Agreement dated April 27, 1995 between PPM and the Company.*** 
 *10.15     License and Supply Agreement dated July 10, 1995 between Veldona Africa, Inc. ("VAF") and Innovative 
            Therapeutics, Ltd. ("ITL").*** 
 *10.16     Pricing Amendment, dated December 5, 1995 between VAF and ITL.*** 
 *10.17     License Agreement dated September 25, 1995 between McGill University and the Company. 
 *10.18     Form of Consulting Agreement between the Company and the Underwriter. 
 *10.19     Research Agreement dated March 25, 1996 between the Company and Ajinomoto Co., Inc. 
 *10.20     1996 Employee Stock Option Plan 
 *10.21     1996 Outside Director and Advisor Stock Option Plan 
 *10.22     Form of Indemnification Agreement between the Company and officers and directors of the Company. 

</TABLE>

<PAGE>

<TABLE>
<CAPTION>

Number        Description 
 -----------   ----------------------------------------------------------------------------------------------- 
<S>           <C>                                                      
**10.23       Indemnification Agreement between HBL and the Company. 
**10.24       Stock Purchase Agreement dated as of September 21, 1987 between Mesa Operating Limited Partnership           
              and the Company. 
**10.25       Research License and Supply Agreement dated May 20, 1996 between the Company and Virbac S.A. 
**23.1        Consent of Lowenthal, Landau, Fischer & Bring, P.C. (included in Exhibit 5.1). 
**23.2        Consent of Ernst & Young LLP 
 *24.1        Powers of Attorney (contained on signature page of Registration Statement). 
</TABLE>

   
- ------ 
  * Previously filed. 
 ** Filed herewith. 
*** Confidential treatment has been requested with respect to portions of 
    this document. Omitted portions have been filed separately with the 
    Securities and Exchange Commisssion. 
    







<PAGE>

                           AMARILLO BIOSCIENCES, INC.

                        2,000,000 Shares of Common Stock

                                ($.01 Par Value)

                             UNDERWRITING AGREEMENT

Whale Securities Co., L.P.                                    New York, New York
650 Fifth Avenue                                              ___________, 1996
New York, New York  10019

Dear Sirs:

                  Amarillo Biosciences, Inc., a Texas corporation (the
"Company"), proposes to issue and sell to Whale Securities Co., L.P. (the
"Underwriter") 2,000,000 shares of common stock, par value $.01 per share (the
"Offered Shares"), which Offered Shares are presently authorized but unissued
shares of the common stock, par value $.01 per share (individually a "Common
Share" and collectively the "Common Shares"), of the Company. In addition, the
Underwriter, in order to cover over-allotments in the sale of the Offered
Shares, may purchase for its own account an aggregate of not more than 300,000
Common Shares (the "Optional Shares"; the Offered Shares and the Optional Shares
are hereinafter sometimes collectively referred to as the "Shares"). The Shares
are described in the Registration Statement, as defined below. The Company also
proposes to issue and sell to the Underwriter for its own account and the
accounts of its designees, warrants to purchase an aggregate of 200,000 Common
Shares at an exercise price of $8.10 per share (the "Underwriter's Warrants"),
which sale will be consummated in accordance with the terms and conditions of
the form of Underwriter's Warrant filed as an exhibit to the Registration
Statement.

                  The Company hereby confirms its agreement with the Underwriter
as follows:

   
                   1. Purchase and Sale of Offered Shares. On the basis of the
representations and warranties herein contained, but subject to the terms and
conditions herein set forth, the Company hereby agrees to sell the Offered
Shares to the Underwriter, and the Underwriter agrees to purchase the Offered
Shares from the Company, at a purchase price of $4.50 per Offered Share. The
Underwriter plans to offer the Shares to the public at a public offering price
of $5.00 per Offered Share.
    



<PAGE>



                  2.       Payment and Delivery.


   
                           (a) Payment for the Offered Shares will be made to
the Company by same day funds or wire transfer payable to its order in New York
Clearing House funds, at the offices of the Underwriter, 650 Fifth Avenue, New
York, New York 10019, against delivery of the Offered Shares to the Underwriter.
Such payment and delivery will be made at _________, New York City time, on the
third business day following the Effective Date as defined below, the date and
time of such payment and delivery being herein called the "Closing Date." The
certificates representing the Offered Shares to be delivered will be in such
denominations and registered in such names as the Underwriter may request not
less than one full business day prior to the Closing Date, and will be made
available to the Underwriter for inspection, checking and packaging at the
office of the Company's transfer agent or correspondent in New York City,
American Stock Transfer & Trust Company, 40 Wall Street, New York, New York
10005 not less than one full business day prior to the Closing Date.
    

                           (b) On the Closing Date, the Company will sell the
Underwriter's Warrants to the Underwriter or to its designees (limited to
officers of the Underwriter). The Underwriter's Warrants will be in the form of,
and in accordance with, the provisions of the Underwriter's Warrant attached as
an exhibit to the Registration Statement. The aggregate purchase price for the
Underwriter's Warrants is $200. The Underwriter's Warrants will be restricted
from sale, transfer, assignment or hypothecation for a period of one year from
the Effective Date, except to officers and partners of the Underwriter and
members of the selling group and/or their officers or partners. Payment for the
Underwriter's Warrants will be made to the Company by check or checks payable to
its order on the Closing Date against delivery of the certificates representing
the Underwriter's Warrants. The certificates representing the Underwriter's
Warrants will be in such denominations and such names as the Underwriter may
request prior to the Closing Date.

                  3.       Option to Purchase Optional Shares.

                           (a) For the purposes of covering any overallotments
in connection with the distribution and sale of the Offered Shares as
contemplated by the Prospectus as defined below, the Underwriter is hereby
granted an option to purchase all or any part of the Optional Shares from the
Company. The purchase price to be paid for the Optional Shares will be the same
price per Optional Share as the price per Offered Share set forth in Section 1
hereof. The option granted hereby may be exercised by the Underwriter as to all
or any part of the Optional Shares at any time within 45 days after the
Effective Date. The Underwriter will not be under any


                                        2


<PAGE>



obligation to purchase any Optional Shares prior to the exercise of
such option.

                           (b) The option granted hereby may be exercised by the
Underwriter by giving oral notice to the Company, which must be confirmed by a
letter, telex or telegraph setting forth the number of Optional Shares to be
purchased, the date and time for delivery of and payment for the Optional Shares
and stating that the Optional Shares referred to therein are to be used for the
purpose of covering over-allotments in connection with the distribution and sale
of the Offered Shares. If such notice is given prior to the Closing Date, the
date set forth therein for such delivery and payment will not be earlier than
either two full business days thereafter or the Closing Date, whichever occurs
later. If such notice is given on or after the Closing Date, the date set forth
therein for such delivery and payment will not be earlier than five full
business days thereafter. In either event, the date so set forth will not be
more than 15 full business days after the date of such notice. The date and time
set forth in such notice is herein called the "Option Closing Date." Upon
exercise of such option, the Company will become obligated to convey to the
Underwriter, and, subject to the terms and conditions set forth in Section 3(d)
hereof, the Underwriter will become obligated to purchase, the number of
Optional Shares specified in such notice.


   
                           (c) Payment for the Optional Shares purchased will be
made to the Company by same day funds or wire transfer payable to its order in
New York Clearing House funds, at the office of the Underwriter, against
delivery of the Optional Shares purchased to the Underwriter. The certificates
representing the Optional Shares to be delivered will be in such denominations
and registered in such names as the Underwriter requests not less than two full
business days prior to the Option Closing Date, and will be made available to
the Underwriter for inspection, checking and packaging at the aforesaid office
of the Company's transfer agent or correspondent not less than one full business
day prior to the Option Closing Date.
    

                           (d) The obligation of the Underwriter to purchase and
pay for any of the Optional Shares is subject to the accuracy and completeness
(as of the date hereof and as of the Option Closing Date) of and compliance in
all material respects with the representations and warranties of the Company
herein, to the accuracy and completeness of the statements of the Company or its
officers made in any certificate or other document to be delivered by the
Company pursuant to this Agreement, to the performance in all material respects
by the Company of its obligations hereunder, to the satisfaction by the Company
of the conditions, as of the date hereof and as of the Option Closing Date, set
forth in Section


                                        3


<PAGE>



3(b) hereof, and to the delivery to the Underwriter of opinions, certificates
and letters dated the Option Closing Date substantially similar in scope to
those specified in Section 5, 6(b), (c), (d) and (e) hereof, but with each
reference to "Offered Shares" and "Closing Date" to be, respectively, to the
Optional Shares and the Option Closing Date.

                   4.      Representations and Warranties of the Company.  The
Company represents and warrants to, and agrees with, the Underwriter that:

                           (a) The Company is a corporation duly organized,
validly existing and in good standing under the laws of the State of Texas, with
full power and authority, corporate and other, to own or lease and operate its
properties and to conduct its business as described in the Registration
Statement and to execute, deliver and perform this Agreement and the
Underwriter's Warrants and to consummate the transactions contemplated hereby
and thereby. The Company is duly qualified to do business as a foreign
corporation and is in good standing in all jurisdictions wherein such
qualification is necessary and failure so to qualify could have a material
adverse effect on the financial condition, results of operations, business or
properties of the Company. Other than the companies listed on Schedule A to this
Agreement (the "Subsidiaries"), the Company has no subsidiaries.

                           Each Subsidiary is a corporation duly organized,
validly existing and in good standing under the laws of the jurisdiction in
which it was incorporated, with full power and authority, corporate and other,
to own or lease and operate its properties and to conduct its business as
described in the Registration Statement. Each Subsidiary is duly qualified to do
business as a foreign corporation and is in good standing in all jurisdictions
wherein such qualification is necessary and failure so to qualify could have a
material adverse effect on the financial condition, results of operations,
business or properties of such Subsidiary.

                           The Company owns all of the issued and outstanding
shares of capital stock of each Subsidiary, free and clear of any security
interests, liens, encumbrances, claims and charges, and all of such shares have
been duly authorized and validly issued and are fully paid and nonassessable.
There are no options or warrants for the purchase of, or other rights to
purchase, or outstanding securities convertible into or exchangeable for, any
capital stock or other securities of any Subsidiary.


   
                           (b) Each of this Agreement and the Consulting
Agreement described in Section 5(r) hereof (the "Consulting Agreement") has been
duly executed and delivered by the Company and
    


                                        4


<PAGE>



   
upon the due execution and delivery thereof by the other parties thereto will
constitute the valid and binding obligation of the Company, and the
Underwriter's Warrants, when executed and delivered by the Company and paid for
by the Underwriter in accordance with the terms of the Underwriter's Warrant
Agreement on the Closing Date, will be the valid and binding obligations of the
Company, enforceable against the Company in accordance with their respective
terms. The execution, delivery and performance of this Agreement, the Consulting
Agreement and the Underwriter's Warrants by the Company, the consummation by the
Company of the transactions herein and therein contemplated and the compliance
by the Company with the terms of this Agreement, the Consulting Agreement and
the Underwriter's Warrants have been duly authorized by all necessary corporate
action and do not and will not, with or without the giving of notice or the
lapse of time, or both, (i) result in any violation of the articles of
incorporation or by-laws of the Company; (ii) result in a breach of or conflict
with any of the terms or provisions of, or constitute a default under, or result
in the modification or termination of, or result in the creation or imposition
of any lien, security interest, charge or encumbrance upon any of the properties
or assets of the Company or any Subsidiary pursuant to any indenture, mortgage,
note, contract, commitment or other agreement or instrument to which the Company
or any Subsidiary is a party or by which the Company or any Subsidiary or any of
their respective properties or assets is or may be bound or affected; (iii)
violate any existing applicable law, rule, regulation, judgment, order or decree
of any governmental agency or court, domestic or foreign, having jurisdiction
over the Company or any Subsidiary or any of their respective properties or
business; or (iv) have any effect on any permit, certification, registration,
approval, consent, license or franchise necessary for the Company or any
Subsidiary to own or lease and operate its properties and to conduct its
business or the ability of the Company to make use thereof.
    

                           (c) No authorization, approval, consent, order,
registration, license or permit of any court or governmental agency or body,
other than under the Securities Act of 1933, as amended (the "Act"), the
Regulations (as hereinafter defined) and applicable state securities or Blue Sky
laws, is required for the valid authorization, issuance, sale and delivery of
the Shares to the Underwriter, and the consummation by the Company of the
transactions contemplated by this Agreement, the Consulting Agreement or the
Underwriter's Warrants and if so required, all such authorizations, approvals,
consents, orders, registrations, licenses or permits have been duly obtained and
are in full force and effect.

                           (d) The conditions for use of a registration
statement on Form SB-2 set forth in the General Instructions to


                                        5


<PAGE>



   
Form SB-2 have been satisfied with respect to the Company, the transactions
contemplated herein and in the Registration Statement. The Company has prepared
in conformity with the requirements of the Act and the rules and regulations
(the "Regulations") of the Securities and Exchange Commission (the "Commission")
and filed with the Commission a registration statement (File No. 333-04413) on
Form SB-2 and has filed one or more amendments thereto, covering the
registration of the securities under the Act, including the related preliminary
prospectus or preliminary prospectuses (each thereof being herein called a
"Preliminary Prospectus") and a proposed final prospectus. Each Preliminary
Prospectus was endorsed with the legend required by Item 501(a)(5) of Regulation
S-B of the Regulations and, if applicable, Rule 430A of the Regulations. Such
registration statement including any documents incorporated by reference therein
and all financial schedules and exhibits thereto, as amended at the time it
becomes effective, and the final prospectus included therein are herein,
respectively, called the "Registration Statement" and the "Prospectus," except
that, (i) if the prospectus filed by the Company pursuant to Rule 424(b) of the
Regulations differs from the Prospectus, the term "Prospectus" will also include
the prospectus filed pursuant to Rule 424(b), and (ii) if the Registration
Statement is amended or such Prospectus is supplemented after the effective date
of the Registration Statement (the "Effective Date") and prior to the Option
Closing Date, the terms "Registration Statement" and "Prospectus" shall include
the Registration Statement as amended or supplemented.
    

                           (e) Neither the Commission nor, to the best of the
Company's knowledge, any state regulatory authority has issued any order
preventing or suspending the use of any Preliminary Prospectus or has instituted
or, to the best of the Company's knowledge, threatened to institute any
proceedings with respect to such an order.

                           (f) The Registration Statement when it becomes
effective, the Prospectus (and any amendment or supplement thereto) when it is
filed with the Commission pursuant to Rule 424(b), if applicable, and both
documents as of the Closing Date or the Option Closing Date referred to below,
will contain all statements which are required to be stated therein in
accordance with the Act and the Regulations and will in all material respects
conform to the requirements of the Act and the Regulations, and neither the
Registration Statement nor the Prospectus, nor any amendment or supplement
thereto, on such dates, will 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, except that this representation and warranty does not
apply to statements or omissions made in reliance upon and in

                                       6
<PAGE>

conformity with information furnished in writing to the Company in connection
with the Registration Statement or Prospectus or any amendment or supplement
thereto by the Underwriter expressly for use therein.

                           (g) The Company had at the date or dates indicated in
the Prospectus a duly authorized and outstanding capitalization as set forth in
the Registration Statement and the Prospectus. Based on the assumptions stated
in the Registration Statement and the Prospectus, the Company will have on the
Closing Date the adjusted stock capitalization set forth therein. Except as set
forth in the Registration Statement or the Prospectus, on the Effective Date and
on the Closing Date, there will be no options to purchase, warrants or other
rights to subscribe for, or any securities or obligations convertible into, or
any contracts or commitments to issue or sell shares of the Company's capital
stock or any such warrants, convertible securities or obligations. Except as set
forth in the Prospectus, no holders of any of the Company's securities has any
rights, "demand," "piggyback" or otherwise, to have such securities registered
under the Act.

                           (h) The descriptions in the Registration Statement
and the Prospectus of contracts and other documents are accurate and present
fairly the information required to be disclosed, and there are no contracts or
other documents required to be described in the Registration Statement or
Prospectus or to be filed as exhibits to the Registration Statement under the
Act or the Regulations which have not been so described or filed as required.

                           (i) Ernst & Young LLP, the accountants who have
certified certain of the consolidated financial statements filed and to be filed
with the Commission as part of the Registration Statement and the Prospectus,
are independent public accountants within the meaning of the Act and
Regulations. The consolidated financial statements and schedules and the notes
thereto filed as part of the Registration Statement and included in the
Prospectus are complete, correct and present fairly the financial position of
the Company as of the dates thereof, and the results of operations and changes
in financial position of the Company for the periods indicated therein, all in
conformity with generally accepted accounting principles applied on a consistent
basis throughout the periods involved except as otherwise stated in the
Registration Statement and the Prospectus. The selected financial data set forth
in the Registration Statement and the Prospectus present fairly the information
shown therein and have been compiled on a basis consistent with that of the
audited and unaudited financial statements included in the Registration
Statement and the Prospectus.

                           (j) The Company and each Subsidiary has filed with


                                        7


<PAGE>


the appropriate federal, state and local governmental agencies, and all foreign
countries and political subdivisions thereof, all tax returns, including
franchise tax returns, which are required to be filed or has duly obtained
extensions of time for the filing thereof and has paid all taxes shown on such
returns and all assessments received by it to the extent that the same have
become due; and the provisions for income taxes payable, if any, shown on the
consolidated financial statements filed with or as part of the Registration
Statement are sufficient for all accrued and unpaid foreign and domestic taxes,
whether or not disputed, and for all periods to and including the dates of such
consolidated financial statements. Except as disclosed in writing to the
Underwriter, neither the Company nor any Subsidiary has executed or filed with
any taxing authority, foreign or domestic, any agreement extending the period
for assessment or collection of any income taxes and is not a party to any
pending action or proceeding by any foreign or domestic governmental agency for
assessment or collection of taxes; and no claims for assessment or collection of
taxes have been asserted against the Company or any Subsidiary.

                           (k) The outstanding Common Shares and outstanding
options to purchase Common Shares have been duly authorized and validly issued.
The outstanding Common Shares are fully paid and nonassessable. The outstanding
options and warrants to purchase Common Shares constitute the valid and binding
obligations of the Company, enforceable in accordance with their terms. None of
the outstanding Common Shares and options to purchase Common Shares has been
issued in violation of the preemptive rights of any shareholder of the Company.
None of the holders of the outstanding Common Shares is subject to personal
liability solely by reason of being such a holder. The offers and sales of the
outstanding Common Shares and outstanding options to purchase Common Shares were
at all relevant times either registered under the Act and the applicable state
securities or Blue Sky laws or exempt from such registration requirements. The
authorized Common Shares and outstanding options to purchase Common Shares
conform to the descriptions thereof contained in the Registration Statement and
Prospectus. Except as set forth in the Registration Statement and the
Prospectus, on the Effective Date and the Closing Date, there will be no
outstanding options or warrants for the purchase of, or other outstanding rights
to purchase, Common Shares or securities convertible into Common Shares.

                           (l) No securities of the Company have been sold by
the Company or by or on behalf of, or for the benefit of, any person or persons
controlling, controlled by, or under common control with the Company within the
three years prior to the date hereof, except as disclosed in the Registration
Statement.



                                       8


<PAGE>



                           (m) The issuance and sale of the Shares have been
duly authorized and, when the Shares have been issued and duly delivered against
payment therefor as contemplated by this Agreement, the Shares will be validly
issued, fully paid and nonassessable, and the holders thereof will not be
subject to personal liability solely by reason of being such holders. The Shares
will not be subject to preemptive rights of any shareholder of the Company.

                           (n) The issuance and sale of the Common Shares
issuable upon exercise of the Underwriter's Warrants have been duly authorized
and, when such Common Shares have been duly delivered against payment therefor,
as contemplated by the Underwriter's Warrants, such Common Shares will be
validly issued, fully paid and nonassessable. Holders of Common Shares issuable
upon the exercise of the Underwriter's Warrants will not be subject to personal
liability solely by reason of being such holders. Neither the Underwriter's
Warrants nor the Common Shares issuable upon exercise thereof will be subject to
preemptive rights of any shareholder of the Company. The Common Shares issuable
upon exercise of the Underwriter's Warrants have been duly reserved for issuance
upon exercise of the Underwriter's Warrants in accordance with the provisions of
the Underwriter's Warrants. The Underwriter's Warrants conform to the
descriptions thereof contained in the Registration Statement and Prospectus.


   
                           (o) Neither the Company nor any Subsidiary is in
violation of, or in default under, (i) any term or provision of its Articles of
Incorporation, as amended, or By-Laws; (ii) any material term or provision or
any financial covenants of any indenture, mortgage, contract, commitment or
other agreement or instrument to which it is a party or by which it or any of
its property or business is or may be bound or affected; or (iii) any existing
applicable law, rule, regulation, judgment, order or decree of any governmental
agency or court, domestic or foreign, having jurisdiction over the Company or
any Subsidiary or any of the Company's or any Subsidiary's properties or
business. The Company and each Subsidiary owns, possesses or has obtained all
governmental and other (including those obtainable from third parties) licenses,
permits, certifications, registrations, approvals or consents and other
authorizations necessary to own or lease, as the case may be, and to operate its
properties, whether tangible or intangible, and to conduct any of the business
or operations of the Company as presently conducted and all such licenses,
permits, certifications, registrations, approvals, consents and other
authorizations are outstanding and in good standing, and there are no
proceedings pending or, to the best of the Company's knowledge, threatened, or
any basis therefor, seeking to cancel, terminate or limit such licenses,
permits, certifications, registrations, approvals or consents or other
    


                                        9


<PAGE>



authorizations.
                           (p) Except as set forth in the Prospectus, there are
no claims, actions, suits, proceedings, arbitrations, investigations or
inquiries before any governmental agency, court or tribunal, domestic or
foreign, or before any private arbitration tribunal, pending, or, to the best of
the Company's knowledge, threatened against the Company or any Subsidiary or
involving its or any Subsidiary's properties or business which, if determined
adversely to the Company or any Subsidiary, would, individually or in the
aggregate, result in any material adverse change in the financial position,
shareholders' equity, results of operations, properties, business, management or
affairs or business prospects of the Company or any Subsidiary or which question
the validity of the capital stock of the Company or this Agreement or of any
action taken or to be taken by the Company pursuant to, or in connection with,
this Agreement; nor, to the best of the Company's knowledge, is there any basis
for any such claim, action, suit, proceeding, arbitration, investigation or
inquiry (except as may arise from the Hoffmann LaRoche patent described in the
Registration Statement, the description thereof being accurate and complete in
all material respects). There are no outstanding orders, judgments or decrees of
any court, governmental agency or other tribunal naming the Company or any
Subsidiary and enjoining the Company or any Subsidiary from taking, or requiring
the Company or any Subsidiary to take, any action, or to which the Company or
any Subsidiary or the Company's or any Subsidiary's properties or businesses is
bound or subject.

                           (q) Neither the Company nor any of its affiliates has
incurred any liability for any finder's fees or similar payments in connection
with the transactions herein contemplated.

                           (r) The Company and each of the Subsidiaries owns or
possesses adequate and enforceable rights to use all patents, patent
applications, trademarks, service marks, copyrights, rights, trade secrets,
confidential information, processes and formulations used or proposed to be used
in the conduct of their businesses as described in the Prospectus (collectively
the "Intangibles"); to the best of the Company's knowledge, neither the Company
nor any Subsidiary has infringed or is infringing with the rights of others with
respect to Intangibles; and except as set forth in the Registration Statement,
the description thereof being accurate and complete in all material respects,
neither the Company nor any Subsidiary has received any notice of conflict with
the asserted rights of others with respect to Intangibles which could, singly or
in the aggregate, materially adversely affect its business as presently
conducted or prospects, financial condition or results of operations of the
Company or any Subsidiary, and the Company knows of no basis therefor; and, to
the best of the Company's knowledge,


                                       10


<PAGE>



no others have infringed upon the Intangibles of the Company or any Subsidiary.

                           (s) Since the respective dates as of which
information is given in the Registration Statement and the Prospectus and the
Company's latest consolidated financial statements, neither the Company nor any
Subsidiary has incurred any material liability or obligation, direct or
contingent, or entered into any material transaction, whether or not in the
ordinary course of business, and has not sustained any material loss or
interference with its business from fire, storm, explosion, flood or other
casualty, whether or not covered by insurance, or from any labor dispute or
court or governmental action, order or decree; and since the respective dates as
of which information is given in the Registration Statement and the Prospectus,
there have not been, and prior to the Closing Date referred to below there will
not be, any changes in the capital stock or any material increases in the
long-term debt of the Company or any material adverse change in or affecting the
general affairs, management, financial condition, shareholders' equity, results
of operations or prospects of the Company or any Subsidiary, otherwise than as
set forth or contemplated in the Prospectus.

                           (t) The Company and each Subsidiary has good and
marketable title in fee simple to all real property and good title to all
personal property (tangible and intangible) owned by it, free and clear of all
security interests, charges, mortgages, liens, encumbrances and defects, except
such as are described in the Registration Statement and Prospectus or such as do
not materially affect the value or transferability of such property and do not
interfere with the use of such property made, or proposed to be made, by the
Company or any Subsidiary. The leases, licenses or other contracts or
instruments under which the Company and each Subsidiary leases, holds or is
entitled to use any property, real or personal, are valid, subsisting and
enforceable only with such exceptions as are not material and do not interfere
with the use of such property made, or proposed to be made, by the Company or
any Subsidiary, and all rentals, royalties or other payments accruing thereunder
which became due prior to the date of this Agreement have been duly paid, and
neither the Company nor any Subsidiary, nor, to the best of the Company's
knowledge, any other party, is in default thereunder and, to the best of the
Company's knowledge, no event has occurred which, with the passage of time or
the giving of notice, or both, would constitute a default thereunder. Neither
the Company nor any Subsidiary has received notice of any violation of any
applicable law, ordinance, regulation, order or requirement relating to its
owned or leased properties. The Company and each Subsidiary has adequately
insured its properties against loss or damage by fire or other casualty and
maintains, in adequate amounts, such other insurance as is usually maintained by
companies



                                       11


<PAGE>



engaged in the same or similar businesses located in its geographical area.

                           (u) Each contract or other instrument (however
characterized or described) to which the Company or any Subsidiary is a party or
by which its property or business is or may be bound or affected and to which
reference is made in the Prospectus has been duly and validly executed, is in
full force and effect in all material respects and is enforceable against the
parties thereto in accordance with its terms, and none of such contracts or
instruments has been assigned by the Company or any Subsidiary, and neither the
Company nor any Subsidiary, nor, to the best of the Company's knowledge, any
other party is in default thereunder and, to the best of the Company's
knowledge, no event has occurred which, with the lapse of time or the giving of
notice, or both, would constitute a default thereunder.


   
                           None of the material provisions of such contracts or
instruments violates any existing applicable law, rule, regulation, judgment,
order or decree of any governmental agency or court having jurisdiction over the
Company or any of its Subsidiaries or any of their respective assets or
businesses, including, without limitation, those relating to the production,
development, research, marketing or commercialization of biologics.
    

                           (v) The employment, consulting, confidentiality and
non-competition agreements between the Company and between each Subsidiary and
their respective officers, employees and consultants, described in the
Registration Statement, are binding and enforceable obligations upon the
respective parties thereto in accordance with their respective terms, except as
such enforceability may be limited by applicable bankruptcy, insolvency,
moratorium or other similar laws or arrangements affecting creditors' rights
generally and subject to principles of equity.

                           (w) Except as set forth in the Prospectus, the
Company has no employee benefit plans (including, without limitation, profit
sharing and welfare benefit plans) or deferred compensation arrangements that
are subject to the provisions of the Employee Retirement Income Security Act of
1974.


   
                           (x) Except as set forth in the Prospectus, neither
the Company nor any Subsidiary manufactures, fabricates or markets any product
or performs any service which is subject to regulation by the federal Food and
Drug Administration (the "FDA"), or to any provision of the Food, Drug and
Cosmetic Act, as amended (the "FDA Act"), or any rule or regulation promulgated
thereunder.
    

                           To the best of the Company's knowledge, with respect
to the products manufactured, fabricated or marketed by the Company



                                       12


<PAGE>



   
and/or any Subsidiary and the services performed by them which are subject to
such regulation, the Company and each Subsidiary are in compliance with the
provisions of the FDA Act and the rules and regulations promulgated thereunder.
    

                           (y) To the best of the Company's knowledge, no labor
problem exists with any of the Company's or any Subsidiary's employees or is
imminent which could adversely affect the Company or any Subsidiary.

                           (z) The Company has not, directly or indirectly, at
any time (i) made any contributions to any candidate for political office, or
failed to disclose fully any such contribution in violation of law or (ii) made
any payment to any state, federal or foreign governmental officer or official,
or other person charged with similar public or quasi-public duties, other than
payments or contributions required or allowed by applicable law. The Company's
internal accounting controls and procedures are sufficient to cause the Company
to comply in all material respects with the Foreign Corrupt Practices Act of
1977, as amended.


   
                           (aa) The Shares have been approved for listing on the
National Association of Securities Dealers, Inc. ("NASDAQ") Small Cap Market.
    

                           (ab) The Company's response to the Corporate Review
Memorandum of Tenzer Greenblatt LLP, counsel to the Underwriter ("Underwriter's
Counsel"), dated March 13, 1996, is true, accurate and complete.

                           (ac) Veldona, Inc., a subsidiary of Amarillo Cell of
Canada, Inc., a subsidiary of the Company, is inactive and conducts no business.

                           Any certificate signed by an officer of the Company
or of any subsidiary and delivered to the Underwriter or to counsel for the
Underwriter shall be deemed to be a representation and warranty by the Company
to the Underwriter as to the matters covered thereby.

                  5. Certain Covenants of the Company. The Company covenants
with the Underwriter as follows:

                           (a) The Company will not at any time, whether before
the Effective Date or thereafter during such period as the Prospectus is
required by law to be delivered in connection with the sales of the Shares by
the Underwriter or a dealer, file or publish any amendment or supplement to the
Registration Statement or Prospectus of which the Underwriter has not been
previously 



                                       13


<PAGE>



advised and furnished a copy, or to which the Underwriter shall object in
writing.

                           (b) The Company will use its best efforts to cause
the Registration Statement to become effective and will advise the Underwriter
immediately, and, if requested by the Underwriter, confirm such advice in
writing, (i) when the Registration Statement, or any post-effective amendment to
the Registration Statement or any supplemented Prospectus is filed with the
Commission; (ii) of the receipt of any comments from the Commission; (iii) of
any request of the Commission for amendment or supplementation of the
Registration Statement or Prospectus or for additional information; and (iv) of
the issuance by the Commission of any stop order suspending the effectiveness of
the Registration Statement or of any order preventing or suspending the use of
any Preliminary Prospectus, or of the suspension of the qualification of the
Shares for offering or sale in any jurisdiction, or of the initiation of any
proceedings for any of such purposes. The Company will use its best efforts to
prevent the issuance of any such stop order or of any order preventing or
suspending such use and to obtain as soon as possible the lifting thereof, if
any such order is issued.

                           (c) The Company will deliver to the Underwriter,
without charge, from time to time until the Effective Date, as many copies of
each Preliminary Prospectus as the Underwriter may reasonably request, and the
Company hereby consents to the use of such copies for purposes permitted by the
Act. The Company will deliver to the Underwriter, without charge, as soon as the
Registration Statement becomes effective, and thereafter from time to time as
requested, such number of copies of the Prospectus (as supplemented, if the
Company makes any supplements to the Prospectus) as the Underwriter may
reasonably request. The Company has furnished or will furnish to the Underwriter
two signed copies of the Registration Statement as originally filed and of all
amendments thereto, whether filed before or after the Registration Statement
becomes effective, two copies of all exhibits filed therewith and two signed
copies of all consents and certificates of experts.

                           (d) The Company will comply with the Act, the
Regulations, the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), and the rules and regulations thereunder so as to permit the continuance
of sales of and dealings in the Offered Shares and in any Optional Shares which
may be issued and sold. If, at any time when a prospectus relating to the Shares
is required to be delivered under the Act, any event occurs as a result of which
the Registration Statement and Prospectus as then amended or supplemented would
include an untrue statement of a material fact or omit to state a material fact
necessary to make the statements therein, in light of the circumstances under
which


                                       14


<PAGE>



they were made, not misleading, or if it shall be necessary to amend or
supplement the Registration Statement and Prospectus to comply with the Act or
the regulations thereunder, the Company will promptly file with the Commission,
subject to Section 5(a) hereof, an amendment or supplement which will correct
such statement or omission or which will effect such compliance.

                           (e) The Company will furnish such proper information
as may be required and otherwise cooperate in qualifying the Shares for offering
and sale under the securities or Blue Sky laws relating to the offering or for
sale in such jurisdictions as the Underwriter may reasonably designate, provided
that no such qualification will be required in any jurisdiction where, solely as
a result thereof, the Company would be subject to service of general process or
to taxation or qualification as a foreign corporation doing business in such
jurisdiction.

                           (f) The Company will make generally available to its
security holders, in the manner specified in Rule 158(b) under the Act, and
deliver to the Underwriter as soon as practicable and in any event not later
than 45 days after the end of its fiscal quarter in which the first anniversary
date of the effective date of the Registration Statement occurs, an earning
statement meeting the requirements of Rule 158(a) under the Act covering a
period of at least 12 consecutive months beginning after the effective date of
the Registration Statement.

   
                           (g) For a period of five years from the Effective
Date, the Company will deliver to the Underwriter and to Underwriter's Counsel
on a timely basis (i) a copy of each report or document, including, without
limitation, reports on Forms 8-K, 10-C, 10-K, 10- KSB and 10-Q, 10- QSB and
exhibits thereto, filed or furnished to the Commission, any securities exchange
or the National Association of Securities Dealers, Inc. (the "NASD") on the date
each such report or document is so filed or furnished; (ii) as soon as
practicable, copies of any reports or communications (financial or other) of the
Company mailed to its security holders; (iii) as soon as practicable, a copy of
any Schedule 13D, 13G, 14D-1 or 13E-3 received or prepared by the Company from
time to time; (iv) monthly statements setting forth such information regarding
the Company's results of operations and financial position (including balance
sheet, profit and loss statements and data regarding outstanding purchase
orders) as is regularly prepared by management of the Company; and (v) such
additional information concerning the business and financial condition of the
Company as the Underwriter may from time to time reasonably request and which
can be prepared or obtained by the Company without unreasonable effort or
expense. The Company will furnish to its shareholders annual reports containing
audited financial statements and such other periodic reports as it may
    




                                       15


<PAGE>


determine to be appropriate or as may be required by law. Any such information
7 of a non-public nature shall be kept confidential by the Underwriter to the
extent required by applicable securities laws.

                           (h) Neither the Company nor any person that controls,
is controlled by or is under common control with the Company will take any
action designed to or which might be reasonably expected to cause or result in
the stabilization or manipulation of the price of the Common Stock.

                           (i) If the transactions contemplated by this
Agreement are consummated, the Underwriter shall retain the $50,000 previously
paid to it, and the Company will pay or cause to be paid the following: all
costs and expenses incident to the performance of the obligations of the Company
under this Agreement, including, but not limited to, the fees and expenses of
accountants and counsel for the Company, the preparation, printing, mailing and
filing of the Registration Statement (including financial statements and
exhibits), Preliminary Prospectuses and the Prospectus, and any amendments or
supplements thereto, the printing and mailing of the Selected Dealer Agreement,
the issuance and delivery of the Shares to the Underwriter; all taxes, if any,
on the issuance of the Shares; the fees, expenses and other costs of qualifying
the Shares for sale under the Blue Sky or securities laws of those states in
which the Shares are to be offered or sold, the cost of printing and mailing the
"Blue Sky Survey" and fees and disbursements of counsel in connection therewith,
including those of such local counsel as may have been retained for such
purpose; the filing fees incident to securing any required review by the NASD;
the cost of furnishing to the Underwriter copies of the Registration Statement,
Preliminary Prospectuses and the Prospectus as herein provided; the costs of
placing "tombstone advertisements" in any publications which may be selected by
the Underwriter, and all other costs and expenses incident to the performance of
its obligations hereunder which are not otherwise specifically provided for in
this Section 5(i).

                           In addition, at the Closing Date or the Option
Closing Date, as the case may be, the Underwriter will deduct from the payment
for the Offered Shares or the Optional Shares three percent (3%) of the gross
proceeds of the offering (less the sum of $50,000 previously paid to the
Underwriter), as payment for the Underwriter's non-accountable expense allowance
relating to the transactions contemplated hereby, which amount will include the
fees and expenses of counsel for the Underwriter.

                           (j) If the transactions contemplated by this
Agreement or related hereto are not consummated for any reason, then the
Underwriter may retain only an amount equal to its

                                       16


<PAGE>


accountable out-of-pocket expenses up to the sum of $50,000 previously paid to
it; provided, however, that if the Company shall terminate this Agreement
pursuant to Section 10(a) hereof or if the Underwriter shall terminate this
Agreement pursuant to Sections 6 (except Section 6(g) and except if the failure
to satisfy the conditions set forth in Section 6 results from the failure of the
underwriting arrangements to satisfy the requirements of the NASD or from
objection thereto by the Commission or the NASD), 10(b)(i) or 10(b)(ii) hereof,
then the Company will reimburse the Underwriter only for its accountable
out-of-pocket expenses up to a maximum of $75,000, less such $50,000. In no
event, however, will the Underwriter, in the event the offering is terminated,
be entitled to retain or receive more than an amount equal to its actual
accountable out-of-pocket expenses.


   
                           (k) The Company intends to apply the net proceeds
from the sale of the Shares for the purposes set forth in the Prospectus. No
portion of the net proceeds from the sale of the Shares will be used to repay
any indebtedness other than the repayment of $1,000,000 plus interest accrued
thereon from May 19, 1996 to Hayashibara Biochemical Laboratories, Inc. The
Company will file with the Commission all required reports on Form SR in
accordance with the provisions of Rule 463 promulgated under the Act and will
provide a copy of each such report to the Underwriter and its counsel.

                           (l) During the twelve (12) months following the
Effective Date, without the consent of the Underwriter, (i) the Company will not
file any registration statement relating to the offer or sale of any of the
Company's securities, including any registration statement on Form S-8; (ii)
neither the Company nor any of its officers, directors and securityholders will
sell or otherwise dispose of any securities of the Company; provided that,
notwithstanding the foregoing, a group of securityholders beneficially owning
less than [three thousand (3,000)] shares of Common Stock, individually, and
less than thirty thousand (30,000) shares of Common Stock, in the aggregate
(such securityholders being referred to herein as the "Minority Shareholders")
may be excluded from the provisions of this clause (ii); and (iii) no holders of
registration rights relating to securities of the Company will exercise any such
registration rights. The Company will deliver to the Underwriter the agreements
of its officers, directors , securityholders (other than the Minority
Shareholders) and registration rights holders to such effect prior to the
Closing Date.
    

                                       17


<PAGE>



                           (m) The Company will not file any registration
statement relating to the offer or sale of any of the Company's securities,
including any registration statement on Form S-8, during the twelve (12) months
following the date hereof without the Underwriter's prior written consent.

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

                           (o) The Company will use its best efforts to maintain
the listing of the Shares on NASDAQ and, if so qualified, on the National Market
System of NASDAQ for so long as the Shares are qualified for such listing.

                           (p) The Company will, concurrently with the Effective
Date, register the class of equity securities of which the Shares are a part
under Section 12(g) of the Exchange Act and the Company will maintain the
registration for a minimum of five years after the Effective Date.


   
                           (q) Subject to the sale of the Offered Shares, the
Underwriter and its successors will have the right to designate a nominee for
election, at its or their option, either as a member of or a non-voting advisor
to the Board of Directors of the Company, and the Company will use its best
efforts to cause such nominee to be elected and continued in office as a
director of the Company or as such advisor until the expiration of five years
from the Effective Date. Each of the Company's current officers, directors and
security holders other than the Minority Shareholders agrees to vote all of the
Common Shares owned by such person so as to elect and continue in office such
nominee of the Underwriter. Following the election of such nominee as a director
or advisor, such person shall receive no more or less compensation than is paid
to other non-officer directors of the Company for attendance at meetings of the
Board of Directors of the Company and shall be entitled to receive reimbursement
for all reasonable costs incurred in attending such meetings including, but not
limited to, food, lodging and transportation. The Company agrees to indemnify
and hold such director or advisor harmless, to the maximum extent permitted by
law, against any and all claims,
    


                                       18


<PAGE>



actions, awards and judgments arising out of his service as a director or
advisor and, in the event the Company maintains a liability insurance policy
affording coverage for the acts of its officers and directors, to include such
director or advisor as an insured under such policy. The rights and benefits of
such indemnification and the benefits of such insurance shall, to the extent
possible, extend to the Underwriter insofar as it may be or may be alleged to be
responsible for such director or advisor. The Company will deliver to the
Underwriter the undertakings as of the date hereof of its current officers,
directors and security holders to vote their shares of Common Stock in
accordance with the provisions of this Section 5(q).

                                    If the Underwriter does not exercise its
option to designate a member of or advisor to the Company's Board of Directors,
the Underwriter shall nonetheless have the right to send a representative (who
need not be the same individual from meeting to meeting) to observe each meeting
of the Board of Directors. The Company agrees to give the Underwriter notice of
each such meeting and to provide the Underwriter with an agenda and minutes of
the meeting no later than it gives such notice and provides such items to the
directors.


   
                           (r) The Company agrees to employ the Underwriter or a
designee of the Underwriter as a financial consultant on a non-exclusive basis
for a period of two years from the Closing Date, pursuant to a separate written
consulting agreement between the Company and the Underwriter and/or such
designee, at an annual rate of Thirty Thousand Dollars ($30,000) (exclusive of
any accountable out-of-pocket expenses) payable in full in advance, with the
first payment to be made on the Closing Date. In addition, the consulting
agreement shall provide that the Company will pay the Underwriter a finder's fee
in the event that the Underwriter originates a merger, acquisition, joint
venture or other transaction to which the Company is a party. The Company
further agrees to deliver a duly and validly executed copy of said consulting
agreement, in form and substance acceptable to the Underwriter, on the Closing
Date.
    

                           (s) The Company shall retain a transfer agent for the
Common Shares, reasonably acceptable to the Underwriter, for a period of five
years following the Effective Date. In addition, for a period of five years from
the Effective Date, the Company, at its own expense, shall cause such transfer
agent to provide the Underwriter, if so requested in writing, with copies of the
Company's daily transfer sheets and when requested by the Underwriter, a current
list of the Company's security holders, including a list of the beneficial
owners of securities held by a depository trust company and other nominees.


                                       19


<PAGE>




                           (t) The Company hereby agrees, at its sole cost and
expense, to supply and deliver to the Underwriter, within a reasonable period
from the date hereof, four bound volumes, including the Registration Statement,
as amended or supplemented, all exhibits to the Registration Statement, the
Prospectus and all other underwriting documents.

                           (u) The Company shall, as of the date hereof, have
applied for listing in Standard & Poor's Corporation Records Service (including
annual report information) or Moody's Industrial Manual (Moody's OTC Industrial
Manual not being sufficient for these purposes) and shall use its best efforts
to have the Company listed in such manual at or prior to the Effective Date and
shall maintain such listing for a period of five years from the Effective Date.

                           (v) For a period of five years from the Effective
Date, the Company shall provide the Underwriter, on a not less than annual
basis, with internal forecasts setting forth projected results of operations for
each quarterly and annual period in the two fiscal years following the
respective dates of such forecasts. Such forecasts shall be provided to the
Underwriter more frequently than annually if prepared more frequently by
management, and revised forecasts shall be prepared and provided to the
Underwriter when required to reflect more current information, revised
assumptions or actual results that differ materially from those set forth in the
forecasts.

                           (w) For a period of five (5) years from the Effective
Date, or until such earlier time as the Common Shares are listed on the New York
Stock Exchange or the American Stock Exchange, the Company shall cause its legal
counsel to provide the Underwriter with a list, to be updated at least annually,
of those states in which the Common Shares may be traded in non-issuer
transactions under the Blue Sky laws of the 50 states.

                           (x) For a period of five years from the Effective
Date, the Company shall continue to retain Ernst & Young LLP (or such other
nationally recognized accounting firm acceptable to the Underwriter) as the
Company's independent public accountants.

   
                           (y) For a period of five years from the Effective
Date, the Company, at its expense, shall cause its independent certified public
accountants, as described in Section 5(x) above, to review (but not audit) the
Company's financial statements for each of the first three fiscal quarters prior
to the announcement of quarterly financial information, the filing of the
Company's 10-QSB quarterly report and the mailing of quarterly financial
information to shareholders.
    


                                       20


<PAGE>



   
                           (z) For a period of three (3) years following the
Effective Date, the Company will not, without the Underwriter's prior written
consent, increase or authorize an increase in the compensation of Joseph
Cummins, Charles Hughes or Alan Richards without the prior written approval of
the Underwriter, which such approval shall be predicated upon, among other
things (i) the performance of the Company, (ii) the performance of the employee,
and (iii) inflationary trends and other economic conditions; further, the
Company and Joseph Cummins shall have entered into an amendment to his
employment agreement extending its term to a date which is at least three (3)
years after the Effective Date;

                           (aa) For a period of twenty-five days from the
Effective Date, the Company will not issue press releases or engage in any other
publicity without the Underwriter's prior written consent, other than normal and
customary releases issued in the ordinary course of the Company's business or
those releases required by law.

                           (ab) The Company will retain a financial public
relations firm reasonably acceptable to the Underwriter;

                           (ac) For a period of three (3) years following the
Effective Date, the Company will promptly submit to the Underwriter copies of
all accountants' management reports and similar correspondence between the
Company's accountants and the Company;

                           (ad) For a period of three (3) years following the
Effective Date, the Company will not offer or sell any of its securities
pursuant to Regulation S without the prior written consent of the Underwriter;
and

                           (ae) For a period of four (4) years following the
Effective Date, the Company will provide to the Underwriter ten (10) days
written notice prior to any issuance by the Company of any equity securities or
securities exchangeable for or convertible into equity securities of the
Company, except for (i) shares of Common Stock issuable upon exercise of
currently outstanding options and warrants or conversion of currently
outstanding convertible securities and (ii) options available for future grant
pursuant to any stock option plan in effect on the Effective Date.
    


                  6. Conditions of the Underwriter's Obligation to Purchase
Shares from the Company. The obligation of the Underwriter to purchase and pay
for the Offered Shares which it has agreed to purchase from the Company is
subject (as of the date hereof and the Closing Date) to the accuracy of and
compliance in all material respects with the representations and warranties of
the Company herein, to the accuracy of the statements of the 


                                       21


<PAGE>



Company or its officers made pursuant hereto, to the performance in all material
respects by the Company of its obligations hereunder, and to the following
additional conditions:

                           (a) The Registration Statement will have become
effective not later than ______.M., New York City time, on the day following the
date of this Agreement, or at such later time or on such later date as the
Underwriter may agree to in writing; prior to the Closing Date, no stop order
suspending the effectiveness of the Registration Statement will have been issued
and no proceedings for that purpose will have been initiated or will be pending
or, to the best of the Underwriter's or the Company's knowledge, will be
contemplated by the Commission; and any request on the part of the Commission
for additional information will have been complied with to the satisfaction of
Underwriter's Counsel.

                           (b) At the time that this Agreement is executed and
at the Closing Date, there will have been delivered to the Underwriter a signed
opinion of Lowenthal, Landau, Fischer & Bring, P.C., special counsel for the
Company ("Company Counsel"), dated as of the date hereof or the Closing Date, as
the case may be (and any other opinions of counsel referred to in such opinion
of Company Counsel or relied upon by Company Counsel in rendering their
opinion), reasonably satisfactory to Underwriter's Counsel, to the effect that:


   
                                    (i) The Company is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Texas, with full corporate power and authority, and all licenses, permits,
certifications, registrations, approvals, consents and franchises to own or
lease and operate its properties and to conduct its business as described in the
Registration Statement. The Company is duly qualified to do business as a
foreign corporation and is in good standing in all jurisdictions wherein such
qualification is necessary and failure so to qualify could have a material
adverse effect on the financial condition, results of operations, business or
properties of the Company. To the best of Company Counsel's knowledge, other
than the Subsidiaries the Company has no subsidiaries.

                                    Each Subsidiary is a corporation duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its incorporation, with full corporate power and authority, and
all licenses, permits, certifications, registrations, approvals, consents and
franchises to own or lease and operate its properties and to conduct its
business as described in the Registration Statement. Each Subsidiary is duly
qualified to do business as a foreign corporation and is in good standing in all
jurisdictions wherein such qualification is necessary and failure so to qualify
    


                                       22


<PAGE>



   
could have a material adverse effect on the financial condition, results of
operations, business or properties of the Company and its Subsidiaries taken as
a whole.
    

                                    The Company owns all of the issued and
outstanding shares of capital stock of each Subsidiary, free and clear of any
security interests, liens, encumbrances, claims and charges, and all of such
shares have been duly authorized and validly issued and are fully paid and
nonassessable.


   
                                    (ii) The Company has full power and
authority, corporate and other, to execute, deliver and perform this Agreement,
the Consulting Agreement and the Underwriter's Warrants and to consummate the
transactions contemplated hereby and thereby. The execution, delivery and
performance of this Agreement, the Consulting Agreement and the Underwriter's
Warrants by the Company, the consummation by the Company of the transactions
herein and therein contemplated and the compliance by the Company with the terms
of this Agreement, the Consulting Agreement and the Underwriter's Warrants have
been duly authorized by all necessary corporate action, and each of this
Agreement and the Consulting Agreement has been duly executed and delivered by
the Company. This Agreement is (assuming for the purposes of this opinion that
it is valid and binding upon the other party thereto) and the Consulting
Agreement and, when executed and delivered by the Company on the Closing Date
and assuming that the exercise price of the Underwriter's Warrants is paid in
full in accordance with its term, the Underwriter's Warrants will be, valid and
binding obligations of the Company, enforceable in accordance with their
respective terms, subject, as to enforcement of remedies, to applicable
bankruptcy, insolvency, reorganization, moratorium and other laws affecting the
rights of creditors generally and the discretion of courts in granting equitable
remedies and except that enforceability of the indemnification provisions set
forth in Section 7 hereof and the contribution provisions set forth in Section 8
hereof may be limited by the federal securities laws or public policy underlying
such laws.

                                    (iii) The execution, delivery and
performance of this Agreement, the Consulting Agreement and the Underwriter's
Warrants by the Company, the consummation by the Company of the transactions
herein and therein contemplated and the compliance by the Company with the terms
of this Agreement, the Consulting Agreement and the Underwriter's Warrants do
not, and will not, with or without the giving of notice or the lapse of time, or
both, (A) result in a violation of the articles of incorporation or by-laws of
the Company, (B) result in a breach of or conflict with any terms or provisions
of, or constitute a default under, or result in the modification or

    


                                       23


<PAGE>



termination of, or result in the creation or imposition of any lien, security
interest, charge or encumbrance upon any of the properties or assets of the
Company or any Subsidiary pursuant to any indenture, mortgage, note, contract,
commitment or other material agreement or instrument to which the Company or any
Subsidiary is a party or by which the Company or any Subsidiary or any of the
Company's or any Subsidiary's properties or assets are or may be bound or
affected; (C) violate any existing applicable law, rule, regulation, judgment,
order or decree of any governmental agency or court, domestic or foreign, having
jurisdiction over the Company or any Subsidiary or any of the Company's or any
Subsidiary's properties or business; or (D) have any effect on any permit,
certification, registration, approval, consent, license or franchise necessary
for the Company or any Subsidiary to own or lease and operate its properties and
to conduct its business or the ability of the Company to make use thereof. The
opinions described in clauses (B) and (D) of this Section 6(b)(iii) may be given
to the best of Company Counsel's knowledge.

                           (iv) To the best of Company Counsel's knowledge, no
authorization, approval, consent, order, registration, license or permit of any
court or governmental agency or body (other than under the Act, the Regulations
and applicable state securities or Blue Sky laws) is required for the valid
authorization, issuance, sale and delivery of the Shares or the Underwriter's
Warrants to the Underwriter, and the consummation by the Company of the
transactions contemplated by this Agreement, the Consulting Agreement or the
Underwriter's Warrants.

                           (v) The Registration Statement has become effective
under the Act; to the best of Company Counsel's knowledge, no stop order
suspending the effectiveness of the Registration Statement has been issued, and
no proceedings for that purpose have been instituted or are pending, threatened
or contemplated under the Act or applicable state securities laws.

                           (vi) The Registration Statement and the Prospectus,
as of the Effective Date, and each amendment or supplement thereto as of its
effective or issue date (except for the financial statements and other financial
data included therein or omitted therefrom, as to which Company Counsel need not
express an opinion) comply as to form in all material respects with the
requirements of the Act and Regulations; and the conditions for use of a
registration statement on Form SB-2 have been satisfied by the Company.

                           (vii) The descriptions in the Registration Statement
and the Prospectus of statutes, regulations, government classifications,
contracts and other documents (including opinions of such counsel); and the
response to Item 13 of Form SB-2 have



                                       24


<PAGE>



been reviewed by Company Counsel, and, based upon such review, are accurate in
all material respects and present fairly the information required to be
disclosed, and there are no material statutes, regulations or government
classifications, or, to the best of Company Counsel's knowledge, material
contracts or documents, of a character required to be described in the
Registration Statement or the Prospectus or to be filed as exhibits to the
Registration Statement, which are not so described or filed as required.

                           None of the material provisions of the contracts or
instruments described above violates any existing applicable law, rule,
regulation, judgment, order or decree of any governmental agency or court having
jurisdiction over the Company or any Subsidiary or any of their assets or
businesses, including, without limitation, those relating to the production,
development, research, marketing or commercialization of biologics.


   
                           (viii) The outstanding Common Shares and outstanding
options to purchase Common Shares have been duly authorized and validly issued.
The outstanding Common Shares are fully paid and nonassessable. The outstanding
options and warrants to purchase Common Shares constitute the valid and binding
obligations of the Company, enforceable in accordance with their terms, except
as such enforceability may be limited by applicable bankruptcy, insolvency,
moratorium or other similar laws or arrangements affecting creditors' rights
generally and subject to principles of equity. None of the outstanding Common
Shares or options to purchase Common Shares has been issued in violation of the
preemptive rights of any shareholder of the Company. None of the holders of the
outstanding Common Shares is subject to personal liability solely by reason of
being such a holder. The offers and sales of the outstanding Common Shares and
outstanding options to purchase Common Shares were at all relevant times either
registered under the Act and the applicable state securities or Blue Sky laws or
exempt from such registration requirements. The authorized Common Shares and
outstanding options to purchase Common Shares conform to the description thereof
contained in the Registration Statement and Prospectus. To the best of Company
Counsel's knowledge, except as set forth in the Prospectus, no holder of any of
the Company's securities has any rights, "demand", "piggyback" or otherwise, to
have such securities registered under the Act.
    

                           (ix) The issuance and sale of the Shares have been
duly authorized and, when the Shares have been issued and duly delivered against
payment therefor as contemplated by this Agreement, the Shares will be validly
issued, fully paid and nonassessable, and the holders thereof will not be
subject to personal liability solely by reason of being such holders. The



                                       25


<PAGE>




Shares are not subject to preemptive rights of any shareholder of the Company.
The certificates representing the Shares are in proper legal form.

                           (x) The issuance and sale of the Common Shares
issuable upon exercise of the Underwriter's Warrants have been duly authorized
and, when such Common Shares have been duly delivered against payment therefor,
as contemplated by the Underwriter's Warrants, such Common Shares will be
validly issued, fully paid and nonassessable. Holders of Common Shares issuable
upon exercise of the Underwriter's Warrants will not be subject to personal
liability solely by reason of being such holders. Neither the Underwriter's
Warrants nor the Common Shares issuable upon exercise thereof will be subject to
preemptive rights of any shareholder of the Company. The Common Shares issuable
upon exercise of the Underwriter's Warrants have been duly reserved for issuance
upon exercise of the Underwriter's Warrants in accordance with the provisions of
the Underwriter's Warrants.

                           (xi) Upon delivery of the Offered Shares to the
Underwriter against payment therefor as provided in this Agreement, the
Underwriter (assuming it is a bona fide purchaser within the meaning of the
Uniform Commercial Code) will acquire good title to the Offered Shares, free and
clear of all liens, encumbrances, equities, security interests and claims.

                           (xii) Assuming that the Underwriter exercises the
over-allotment option to purchase the Optional Shares and makes payment therefor
in accordance with the terms of this Agreement, upon delivery of the Optional
Shares to the Underwriter hereunder, the Underwriter (assuming it is a bona fide
purchaser within the meaning of the Uniform Commercial Code) will acquire good
title to the Optional Shares, free and clear of any liens, encumbrances,
equities, security interests and claims.

                           (xiii) To the best of Company Counsel's knowledge,
there are no claims, actions, suits, proceedings, arbitrations, investigations
or inquiries before any governmental agency, court or tribunal, foreign or
domestic, or before any private arbitration tribunal, pending or threatened
against the Company or any Subsidiary, or involving the Company's or any
Subsidiary's properties or business, other than as described in the Prospectus,
such description being accurate, and other than litigation incident to the kind
of business conducted by the Company which, individually and in the aggregate,
is not material.

   
                           (xiv)
    

                                       26


<PAGE>



       

   
Company Counsel has participated in reviews and discussions in connection with
the preparation of the Registration Statement and the Prospectus, and in the
course of such reviews and discussions and such other investigation as Company
Counsel deemed necessary, no facts came to its attention which lead it to
believe that (A) the Registration Statement (except as to the financial
statements and other financial data contained therein, and as to patent issues
[Patent counsel will have to give a 10b-5 opinion for any issues excepted out of
Lowenthal's opinion] as to which Company Counsel need not express an opinion),
on the Effective Date, contained any untrue statement of a material fact
required to be stated therein or omitted 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, or that (B) the
Prospectus (except as to the financial statements and other financial data
contained therein, and as to patent issues as to which Company Counsel need not
express an opinion) contains any untrue statement of a material fact or omits to
state any material fact necessary in order to make the
    

statements therein, in the light of the circumstances under which they were
made, not misleading.


   
                           In rendering its opinion, Company Counsel may rely
upon (A) opinions of Morris, Moore, Moss & Douglass, P.C. with respect to
matters relating to the laws of the State of Texas; and (B) the certificates of
government officials and officers of the Company as to matters of fact, provided
that Company Counsel shall state that they have no reason to believe, and do not
believe, that they are not justified in relying upon such opinions or such
    


                                       27


<PAGE>


                           certificates of government officials and officers of
the Company as to matters of fact, as the case may be.

                           The opinion letter delivered pursuant to this Section
6(b) shall state that any opinion given therein qualified by the phrase "to the
best of our knowledge" is being given by Company Counsel after due investigation
of the matters therein discussed.

                           (c) At the time that this Agreement is executed and
at the Closing Date, there will have been delivered to the Underwriter a signed
joint opinion of Browdy and Neimark, P.L.L.C. and Barnes & Thornburg, P.C.,
intellectual property counsel for the Company ("Patent Counsel"), dated as of
the date hereof or the Closing Date, as the case may be, reasonably satisfactory
to Underwriter's Counsel, in the form of Exhibit A attached hereto.

                           The opinion letter delivered pursuant to this Section
6(c) shall state that any opinion given therein qualified by the phrase "to the
best of our knowledge" is being given by Patent Counsel after due investigation
of the matters therein discussed.

   
                           (d) At the Closing Date, there will have been
delivered to the Underwriter a signed opinion of Underwriter's Counsel, dated as
of the Closing Date, to the effect that the opinions delivered pursuant to
Section 6(b) and 6(c) hereof appear on their face to be appropriately responsive
to the requirements of this Agreement, except to the extent waived by the
Underwriter, specifying the same, and with respect to such other matters as the
Underwriter may require.

                           (e) At the Closing Date (i) the Registration
Statement and the Prospectus and any amendments or supplements thereto will
contain all material statements which are required to be stated therein in
accordance with the Act and the Regulations and will conform in all material
respects to the requirements of the Act and the Regulations, and neither the
Registration Statement
    


                                       28


<PAGE>



   
nor the Prospectus nor any amendment or supplement thereto will 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; (ii) since the
respective dates as of which information is given in the Registration Statement
and the Prospectus, there will not have been any material adverse change in the
financial condition, results of operations or general affairs of the Company
from that set forth or contemplated in the Registra-tion Statement and the
Prospectus, except changes which the Registration Statement and the Prospectus
indicates might occur after the Effective Date; (iii) since the respective dates
as of which information is given in the Registration Statement and the
Prospectus, there shall have been no material transaction, contract or agreement
entered into by the Company, other than in the ordinary course of business,
which would be required to be set forth in the Registration Statement and the
Prospectus, other than as set forth therein; and (iv) no action, suit or
proceeding at law or in equity will be pending or, to the best of the Company's
knowledge, threatened against the Company which is required to be set forth in
the Registration Statement and the Prospectus, other than as set forth therein,
and no proceedings will be pending or, to the best of the Company's knowledge,
threatened against the Company before or by any federal, state or other
commission, board or administrative agency wherein an unfavorable decision,
ruling or finding would materially adversely affect the business, property,
financial condition or results of operations of the Company, other than as set
forth in the Registration Statement and the Prospectus. At the Closing Date,
there will be delivered to the Underwriter a certificate signed by the Chairman
of the Board or the President or a Vice President of the Company, dated the
Closing Date, evidencing compliance with the provisions of this Section 6(e) and
stating that the representations and warranties of the Company set forth in
Section 4 hereof were accurate and complete in all material respects when made
on the date hereof and are accurate and complete in all material respects on the
Closing Date as if then made; that the Company has performed all covenants and
complied with all conditions required by this Agreement to be performed or
complied with by the Company prior to or as of the Closing Date; and that, as of
the Closing Date, no stop order suspending the effectiveness of the Registration
Statement has been issued and no proceedings for that purpose have been
initiated or, to the best of his knowledge, are contemplated or threatened. In
addition, the Underwriter will have received such other and further certificates
of officers of the Company as the Underwriter or Underwriter's Counsel may
reasonably request.

                           (f) At the time that this Agreement is executed and
at the Closing Date, the Underwriter will have received a signed letter from
Ernst & Young LLP, dated the date
    

                                       29


<PAGE>



   
such letter is to be received by the Underwriter and addressed to it, confirming
that it is a firm of independent public accountants within the meaning of the
Act and Regulations and stating that: (i) insofar as reported on by them, in
their opinion, the financial statements of the Company included in the
Prospectus comply as to form in all material respects with the applicable
accounting requirements of the Act and the applicable Regulations; (ii) on the
basis of procedures and inquiries (not constituting an examination in accordance
with generally accepted auditing standards) consisting of a reading of the
unaudited interim financial statements of the Company, if any, appearing in the
Registration Statement and the Prospectus and the latest available unaudited
interim financial statements of the Company, if more recent than that appearing
in the Registration Statement and Prospectus, inquiries of officers of the
Company responsible for financial and accounting matters as to the transactions
and events subsequent to the date of the latest audited financial statements of
the Company, and a reading of the minutes of meetings of the shareholders, the
Board of Directors of the Company and any committees of the Board of Directors,
as set forth in the minute books of the Company, nothing has come to their
attention which, in their judgment, would indicate that during the period from
the date of the latest financial statements of the Company appearing in the
Registration Statement and Prospectus to a specified date not more than three
business days prior to the date of such letter, there have been any decreases in
net current assets or net assets as compared with amounts shown in such
financial statements or decreases in net sales or increases in total or per
share net loss compared with the corresponding period in the preceding year or
any change in the capitalization or long-term debt of the Company, except in all
cases as set forth in or contemplated by the Registration Statement and the
Prospectus, and (iii) [on the basis of reviews of interim financial information
performed in accordance with SAS 71, "Interim Financial Information," nothing
has come to their attention which would indicate that] the unaudited interim
financial statements of the Company appearing in the Registration Statement and
the Prospectus, do not comply as to form in all material respects with the
applicable accounting requirements of the Act and the Regulations or are not
fairly presented in conformity with generally accepted accounting principles and
practices on a basis substantially consistent with the audited financial
statements included in the Registration Statement or the Prospectus; and (iv)
they have compared specific dollar amounts, numbers of shares, numerical data,
percentages of revenues and earnings, and other financial information pertaining
to the Company set forth in the Prospectus (with respect to all dollar amounts,
numbers of shares, percentages and other financial information contained in the
Prospectus, to the extent that such amounts, numbers, percentages and
information may be derived from the general accounting records of the Company,
and
    


                                       30


<PAGE>




excluding any questions requiring an interpretation by legal counsel) with the
results obtained from the application of specified readings, inquiries and other
appropriate procedures (which procedures do not constitute an examination in
accordance with generally accepted auditing standards) set forth in the letter,
and found them to be in agreement.

   
                           (g) There shall have been duly tendered to the
Underwriter certificates representing the Offered Shares to be sold on the
Closing Date.

                           (h) The NASD shall have indicated that it has no
objection to the underwriting arrangements pertaining to the sale of the Shares
by the Underwriter.

                           (i) No action shall have been taken by the Commission
or the NASD the effect of which would make it improper, at any time prior to the
Closing Date or the Option Closing Date, as the case may be, for any member firm
of the NASD to execute transactions (as principal or as agent) in the Shares,
and no proceedings for the purpose of taking such action shall have been
instituted or shall be pending, or, to the best of the Underwriter's or the
Company's knowledge, shall be contemplated by the Commission or the NASD. The
Company represents at the date hereof, and shall represent as of the Closing
Date or Option Closing Date, as the case may be, that it has no knowledge that
any such action is in fact contemplated by the Commission or the NASD.

                           (j) The Company meets the current and any existing
proposed criteria for inclusion of the Shares in NASDAQ Small Cap Market.

                           (k) All proceedings taken at or prior to the Closing
Date or the Option Closing Date, as the case may be, in connection with the
authorization, issuance and sale of the Shares shall be reasonably satisfactory
in form and substance to the Underwriter and to Underwriter's Counsel, and such
counsel shall have been furnished with all such documents, certificates and
opinions as they may request for the purpose of enabling them to pass upon the
matters referred to in Section 6(d) hereof and in order to evidence the accuracy
and completeness of any of the representations, warranties or statements of the
Company, the performance of any covenants of the Company, or the compliance by
the Company with any of the conditions herein contained.
    

                           If any of the conditions specified in this Section 6
have not been fulfilled, this Agreement may be terminated by the Underwriter on
notice to the Company.



                                       31


<PAGE>



                  7.       Indemnification.

                           (a) The Company agrees to indemnify and hold harmless
the Underwriter, each officer, director, partner, employee and agent of the
Underwriter, and each person, if any, who controls the Underwriter within the
meaning of Section 15 of the Act or Section 20(a) of the Exchange Act, from and
against any and all losses, claims, damages, expenses or liabilities, joint or
several (and actions in respect thereof), to which they or any of them may
become subject under the Act or under any other statute or at common law or
otherwise, and, except as hereinafter provided, will reimburse the Underwriter
and each such person, if any, for any legal or other expenses reasonably
incurred by them or any of them in connection with investigating or defending
any actions, whether or not resulting in any liability, insofar as such losses,
claims, damages, expenses, liabilities or actions arise out of or are based upon
any untrue statement or alleged untrue statement of a material fact contained
(i) in the Registration Statement, in any Preliminary Prospectus or in the
Prospectus (or the Registration Statement or Prospectus as from time to time
amended or supplemented) or (ii) in any application or other document executed
by the Company, or based upon written information furnished by or on behalf of
the Company, filed in any jurisdiction in order to qualify the Shares under the
securities laws thereof (hereinafter "application"), or arise out of or are
based upon the omission or alleged omission to state therein a material fact
required to be stated therein or necessary in order to make the statements
therein not misleading, in light of the circumstances under which they were
made, unless such untrue statement or omission was made in such Registration
Statement, Preliminary Prospectus, Prospectus or application in reliance upon
and in conformity with information furnished in writing to the Company in
connection therewith by the Underwriter or any such person through the
Underwriter expressly for use therein; provided, however, that the indemnity
agreement contained in this Section 7(a) with respect to any Preliminary
Prospectus will not inure to the benefit of the Underwriter (or to the benefit
of any other person that may be indemnified pursuant to this Section 7(a)) if
(A) the person asserting any such losses, claims, damages, expenses or
liabilities purchased the Shares which are the subject thereof from the
Underwriter or other indemnified person; (B) the Underwriter or other
indemnified person failed to send or give a copy of the Prospectus to such
person at or prior to the written confirmation of the sale of such Shares to
such person; and (C) the Prospectus did not contain any untrue statement or
alleged untrue statement or omission or alleged omission giving rise to such
cause, claim, damage, expense or liability.

                           (b) The Underwriter agrees to indemnify and hold
harmless the Company, each of its directors, each of its officers who have
signed the Registration Statement and each person, if any,



                                       33


<PAGE>



who controls the Company within the meaning of Section 15 of the Act or Section
20(a) of the Exchange Act, from and against any and all losses, claims, damages,
expenses or liabilities, joint or several (and actions in respect thereof), to
which they or any of them may become subject under the Act or under any other
statute or at common law or otherwise, and, except as hereinafter provided, will
reimburse the Company and each such director, officer or controlling person for
any legal or other expenses reasonably incurred by them or any of them in
connection with investigating or defending any actions, whether or not resulting
in any liability, insofar as such losses, claims, damages, expenses, liabilities
or actions arise out of or are based upon any untrue statement or alleged untrue
statement of a material fact contained (i) in the Registration Statement, in any
Preliminary Prospectus or in the Prospectus (or the Registration Statement or
Prospectus as from time to time amended or supplemented) or (ii) in any
application (including any application for registration of the Shares under
state securities or Blue Sky laws), or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary in order to make the statements therein not
misleading, in light of the circumstances under which they were made, but only
insofar as any such statement or omission was made in reliance upon and in
conformity with information furnished in writing to the Company in connection
therewith by the Underwriter expressly for use therein.


   
                           (c) Promptly after receipt of notice of the
commencement of any action in respect of which indemnity may be sought against
any indemnifying party under this Section 7, the indemnified party will notify
the indemnifying party in writing of the commencement thereof, and the
indemnifying party will, subject to the provisions hereinafter stated, assume
the defense of such action (including the employment of counsel satisfactory to
the indemnified party and the payment of expenses) insofar as such action
relates to an alleged liability in respect of which indemnity may be sought
against the indemnifying party. After notice from the indemnifying party of its
election to assume the defense of such claim or action, the indemnifying party
shall no longer be liable to the indemnified party under this Section 7 for any
legal or other expenses subsequently incurred by the indemnified party in
connection with the defense thereof other than reasonable costs of
investigation; provided, however, that if (whether because of actual or possible
conflict of interest or other bona fide reason) in the reasonable judgment of
the indemnified party or parties, it is advisable for the indemnified party or
parties to be represented by separate counsel, the indemnified party or parties
shall have the right to employ a single counsel to represent the indemnified
parties who may be subject to liability arising out of any claim in respect of
which indemnity may be sought by the indemnified parties thereof against the
indemnifying party, in which event the fees and
    


                                       33


<PAGE>



expenses of such separate counsel shall be borne by the indemnifying party. Any
party against whom indemnification may be sought under this Section 7 shall not
be liable to indemnify any person that might otherwise be indemnified pursuant
hereto for any settlement of any action effected without such indemnifying
party's consent, which consent shall not be unreasonably withheld.

                  8. Contribution. To provide for just and equitable
contribution, if (i) an indemnified party makes a claim for indemnification
pursuant to Section 7 hereof (subject to the limitations thereof) and it is
finally determined, by a judgment, order or decree not subject to further
appeal, that such claim for indemnification may not be enforced, even though
this Agreement expressly provides for indemnification in such case; or (ii) any
indemnified or indemnifying party seeks contribution under the Act, the Exchange
Act, or otherwise, then the Company (including, for this purpose, any
contribution made by or on behalf of any director of the Company, any officer of
the Company who signed the Registration Statement and any controlling person of
the Company) as one entity and the Underwriter (including, for this purpose, any
contribution by or on behalf of each person, if any, who controls the
Underwriter within the meaning of Section 15 of the Act or Section 20(a) of the
Exchange Act and each officer, director, partner, employee and agent of the
Underwriter) as a second entity, shall contribute to the losses, liabilities,
claims, damages and expenses whatsoever to which any of them may be subject, so
that the Underwriter is responsible for the proportion thereof equal to the
percentage which the underwriting discount per Share set forth on the cover page
of the Prospectus represents of the initial public offering price per Share set
forth on the cover page of the Prospectus and the Company is responsible for the
remaining portion; provided, however, that if applicable law does not permit
such allocation, then, if applicable law permits, other relevant equitable
considerations such as the relative fault of the Company and the Underwriter in
connection with the facts which resulted in such losses, liabilities, claims,
damages and expenses shall also be considered. The relative fault, in the case
of an untrue statement, alleged untrue statement, omission or alleged omission,
shall be determined by, among other things, whether such statement, alleged
statement, omission or alleged omission relates to information supplied by the
Company or by the Underwriter, and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such statement,
alleged statement, omission or alleged omission. The Company and the Underwriter
agree that it would be unjust and inequitable if the respective obligations of
the Company and the Underwriter for contribution were determined by pro rata or
per capita allocation of the aggregate losses, liabilities, claims, damages and
expenses or by any other method of allocation that does not reflect the
equitable considerations referred to in this Section 8. No person


                                       34


<PAGE>





   
guilty of a fraudulent misrepresentation (within the meaning of Section 11(f) of
the Act) will be entitled to contribution from any person who is not guilty of
such fraudulent misrepresentation. For purposes of this Section 8, each person,
if any, who controls the Underwriter within the meaning of Section 15 of the Act
or Section 20(a) of the Exchange Act and each officer, director, partner,
employee and agent of the Underwriter will have the same rights to contribution
as the Underwriter, and each person, if any, who controls the Company within the
meaning of Section 15 of the Act or Section 20(a) of the Exchange Act, each
officer of the Company who has signed the Registration Statement and each
director of the Company will have the same rights to contribution as the
Company, subject in each case to the provisions of this Section 8. Anything in
this Section 8 to the contrary notwithstanding, no party will be liable for
contribution with respect to the settlement of any claim or action effected
without its written consent. This Section 8 is intended to supersede, to the
extent permitted by law, any right to contribution under the Act or the Exchange
Act or otherwise available.
    

                  9. Survival of Indemnities, Contribution, Warranties and
Representations. The respective indemnity and contribution agreements of the
Company and the Underwriter contained in Sections 7 and 8 hereof, and the
representations and warranties of the Company contained herein shall remain
operative and in full force and effect, regardless of any termination or
cancellation of this Agreement or any investigation made by or on behalf of the
Underwriter, the Company or any of its directors
and officers, or any controlling person referred to in said Sections, and shall
survive the delivery of, and payment for, the Shares.

                 10. Termination of Agreement.

                           (a) The Company, by written or telegraphic notice to
the Underwriter, or the Underwriter, by written or telegraphic notice to the
Company, may terminate this Agreement prior to the earlier of (i) 11:00 A.M.,
New York City time, on the first full business day after the Effective Date; or
(ii) the time when the Underwriter, after the Registration Statement becomes
effective, releases the Offered Shares for public offering. The time when the
Underwriter "releases the Offered Shares for public offering" for the purposes
of this Section 10 means the time when the Underwriter releases for publication
the first newspaper advertisement, which is subsequently published, relating to
the Offered Shares, or the time when the Underwriter releases for delivery to
members of a selling group copies of the Prospectus and an offering letter or an
offering telegram relating to the Offered Shares, whichever will first occur.

                           (b) This Agreement, including without limitation,



                                       35


<PAGE>



the obligation to purchase the Shares and the obligation to purchase the
Optional Shares after exercise of the option referred to in Section 3 hereof,
are subject to termination in the absolute discretion of the Underwriter, by
notice given to the Company prior to delivery of and payment for all the Offered
Shares or the Optional Shares, as the case may be, if, prior to such time, any
of the following shall have occurred: (i) the Company withdraws the Registration
Statement from the Commission or the Company does not or cannot expeditiously
proceed with the public offering; (ii) the representations and warranties in
Section 4 hereof are not materially correct or cannot be complied with; (iii)
trading in securities generally on the New York Stock Exchange or the American
Stock Exchange will have been suspended; (iv) limited or minimum prices will
have been established on either such Exchange; (v) a banking moratorium will
have been declared either by federal or New York State authorities; (vi) any
other restrictions on transactions in securities materially affecting the free
market for securities or the payment for such securities, including the Offered
Shares or the Optional Shares, will be established by either of such Exchanges,
by the Commission, by any other federal or state agency, by action of the
Congress or by Executive Order; (vii) trading in any securities of the Company
shall have been suspended or halted by any national securities exchange, the
NASD or the Commission; (viii) there has been a materially adverse change in the
condition (financial or otherwise), prospects or obligations of the Company;
(ix) the Company will have sustained a material loss, whether or not insured, by
reason of fire, flood, accident or other calamity; (x) any action has been taken
by the government of the United States or any department or agency thereof
which, in the judgment of the Underwriter, has had a material adverse effect
upon the market or potential market for securities in general; or (xi) the
market for securities in general or political, financial or economic conditions
will have so materially adversely changed that, in the judgment of the
Underwriter, it will be impracticable to offer for sale, or to enforce contracts
made by the Underwriter for the resale of, the Offered Shares or the Optional
Shares, as the case may be.

                           (c) If this Agreement is terminated pursuant to
Section 6 hereof or this Section 10 or if the purchases provided for herein are
not consummated because any condition of the Underwriter's obligations hereunder
is not satisfied or because of any refusal, inability or failure on the part of
the Company to comply with any of the terms or to fulfill any of the conditions
of this Agreement, or if for any reason the Company shall be unable to or does
not perform all of its obligations under this Agreement, the Company will not be
liable to the Underwriter for damages on account of loss of anticipated profits
arising out of the transactions covered by this Agreement, but the Company will
remain liable to the extent provided in Sections 5(j), 7, 8 and 9 of this




                                       36


<PAGE>



Agreement.

                  11. Information Furnished by the Underwriter to the Company.
It is hereby acknowledged and agreed by the parties hereto that for the purposes
of this Agreement, including, without limitation, Sections 4(f), 7(a), 7(b) and
8 hereof, the only information given by the Underwriter to the Company for use
in the Prospectus are the statements set forth in the last sentence of the last
paragraph on the cover page, the statement appearing in the last paragraph on
page __ with respect to stabilizing the market price of Shares, the information
in the __ paragraph on page __ with respect to concessions and reallowances, and
the information in the ___ paragraph on page ___ with respect to the
determination of the public offering price, as such information appears in any
Preliminary Prospectus and in the Prospectus.

                  12. Notices and Governing Law. All communications hereunder
will be in writing and, except as otherwise provided, will be delivered at, or
mailed by certified mail, return receipt requested, or telegraphed to, the
following addresses: if to the Underwriter, to 650 Fifth Avenue, New York, New
York 10019, Attention: William G. Walters, with a copy to Tenzer Greenblatt LLP,
Attention: Robert J. Mittman, Esq., 405 Lexington Avenue, New York, New York
10174; if to the Company, addressed to it at 800 West 9th Avenue, Amarillo,
Texas 79101, Attention: Dr. Joseph Cummins, with a copy to Lowenthal, Landau,
Fischer & Bring, P.C., 250 Park Avenue, New York, New York 10177, Attention:
Robert E. Fischer, Esq.

                           This Agreement shall be deemed to have been made and
delivered in New York City and shall be governed as to validity, interpretation,
construction, effect and in all other respects by the internal laws of the State
of New York. The Company (1) agrees that any legal suit, action or proceeding
arising out of or relating to this Agreement shall be instituted exclusively in
New York State Supreme Court, County of New York, or in the United States
District Court for the Southern District of New York, (2) waives any objection
which the Company may have now or hereafter to the venue of any such suit,
action or proceeding, and (3) irrevocably consents to the jurisdiction of the
New York State Supreme Court, County of New York, and the United States District
Court for the Southern District of New York in any such suit, action or
proceeding. The Company further agrees to accept and acknowledge service of any
and all process which may be served in any such suit, action or proceeding in
the New York State Supreme Court, County of New York, or in the United States
District Court for the Southern District of New York and agrees that service of
process upon the Company mailed by certified mail to the Company's address, with
copy to its counsel as set forth in this Section 12, shall be deemed in every
respect effective service of process upon



                                       37


<PAGE>



the Company, in any such suit, action or proceeding.

                  13. Parties in Interest. This Agreement is made solely for the
benefit of the Underwriter, the Company and, to the extent expressed, any person
controlling the Company or the Underwriter, each officer, director, partner,
employee and agent of the Underwriter, the directors of the Company, its
officers who have signed the Registration Statement, and their respective
executors, administrators, successors and assigns, and, no other person will
acquire or have any right under or by virtue of this Agreement. The term
"successors and assigns" will not include any purchaser of the Shares from the
Underwriter, as such purchaser.


                                       38


<PAGE>



                  If the foregoing is in accordance with your understanding of
our agreement, kindly sign and return to us the enclosed duplicates hereof,
whereupon it will become a binding agreement between the Company and the
Underwriter in accordance with its terms.

                                                   Very truly yours,

                                                   AMARILLO BIOSCIENCES, INC.

       
   
                                                   By:
                                                      -------------------------
    

                                                   Name:  Dr. Joseph M. Cummins
                                                   Title: Chairman of the Board

Confirmed and accepted in
New York, N.Y., as of the
date first above written:

WHALE SECURITIES CO., L.P.
By:  Whale Securities Corp.,
         General Partner

By:
   ---------------------------
  Name:  William G. Walters
  Title: Chairman

       

                                       39



<PAGE>
                                                                     EXHIBIT 4.1
AMARILLO BIOSCIENCES, INC.

INCORPORATED UNDER THE LAWS OF THE STATE OF TEXAS

CUSIP

SEE REVERSE FOR CERTAIN DEFINITIONS AND RESTRICTIONS

THIS CERTIFIES that

is the owner of

FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK,  $.01 PAR
VALUE PER
SHARE, OF

AMARILLO BIOSCIENCES, INC.

transferable on the books of the Corporation by the holder hereof in person or
by duly authorized attorney upon surrender of this certificate properly
endorsed. This certificate is not valid unless countersigned by the Transfer
Agent and Registrar.

  WITNESS the facsimile seal of the Corporation and the facsimile
signatures of
its duly authorized officers.

Dated:

COUNTERSIGNED AND REGISTERED:




<PAGE>



AMERICAN STOCK TRANSFER & TRUST COMPANY

(NEW YORK, NEW YORK)

TRANSFER AGENT

BY AND REGISTRAR

AUTHORIZED SIGNATURE

SECRETARY

PRESIDENT



<PAGE>
A FULL STATEMENT OF THE DENIAL OF PREEMPTIVE RIGHTS IS SET FORTH IN THE ARTICLES
OF INCORPORATION OF THE CORPORATION ON FILE IN THE OFFICE OF THE SECRETARY OF
STATE, THE CORPORATION WILL FURNISH A COPY OF SUCH STATEMENT TO THE RECORD
HOLDER OF THIS CERTIFICATE WITHOUT CHARGE ON WRITTEN REQUEST TO THE CORPORATION
AT ITS PRINCIPAL PLACE OF BUSINESS OR REGISTERED OFFICE.

   The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:


TEN COM-  as tenants in common        UNIF GIFT MIN ACT- _____Custodian________
TEN ENT-  as tenants by the entireties                   (Cust)         (Minor)
 JT TEN-  as joint tenants with                   under Uniform Gifts to Minors
          right of survivorship and               Act__________________________
          not as tenants in common                            (State)

     Additional abbreviations may also be used though not in the above list.

For value received,___________________ hereby sell, assign and tranfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFYING NUMBER OF ASSIGNEE

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

- ---------------------------------
_______________________________________________________________________________
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

_______________________________________________________________________________

_______________________________________________________________________________

_________________________________________________________________________shares

of the capital stock represented by the within Certificate, and do hereby

irrevocably constitute and appoint______________________________________Attorney

to transfer the said stock on the books of the within named Corporation with 

full power of substitution in the premises.

Dated ________________________________





                        _______________________________________________________
                        NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT MUST 
                        CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF
                        THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION
                        OR ENLARGEMENT OR ANY CHANGE WHATEVER.



SIGNATURE(S) GUARANTEED:



By______________________________________________________________
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE
GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.


                        



<PAGE>

                                                                     EXHIBIT 4.2

                  WARRANT AGREEMENT dated as of ______, 1996 between Amarillo
Biosciences, Inc., a Texas corporation (the "Company"), and Whale Securities
Co., L.P. (hereinafter referred to as the "Underwriter").

                              W I T N E S S E T H:

                  WHEREAS, the Company proposes to issue to the Underwriter
warrants ("Warrants") to purchase up to 200,000 shares (the "Shares") of common
stock of the Company, $.01 par value (the "Common Stock"); and

                  WHEREAS, the Underwriter has agreed, pursuant to the
underwriting agreement (the "Underwriting Agreement") dated ____________, 1996
between the Underwriter and the Company, to act as the underwriter in connection
with the Company's proposed public offering (the "Public Offering") of 2,000,000
shares of Common Stock at an initial public offering price of $5.00 per share of
Common Stock; and

                  WHEREAS, the Warrants issued pursuant to this Agreement are
being issued by the Company to the Underwriter or officers and partners of the
Underwriter and members of the selling group and/or their officers or partners,
in consideration for, and as part of the Underwriter's compensation in
connection with, the Underwriter acting as the underwriter pursuant to the
Underwriting Agreement;

                  NOW, THEREFORE, in consideration of the premises, the
payment by the Underwriter to the Company of TWO HUNDRED DOLLARS ($200), the
agreements herein set forth and other good and



<PAGE>



valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

                  1.       Grant.

   
                  The Underwriter, and/or its designees who are officers or
partners of the Underwriter or members of the Selling Group in connection with
the Public Offering, are hereby granted the right to purchase, at any time from
__________, 1996 [Effective Date] until 5:00 P.M., New York City time, on
_______, 2001 (the "Warrant Exercise Term"), up to 200,000 Shares at an initial
exercise price (subject to adjustment as provided in Article 8 hereof) of $8.10
per Share.
    

                  2.       Warrant Certificates.

                  The warrant certificates (the "Warrant Certificates")
delivered and to be delivered pursuant to this Agreement shall be in the form
set forth as Exhibit A, attached hereto and made a part hereof, with such
appropriate insertions, omissions, substitutions and other variations as
required or permitted by this Agreement.

                  3.       Exercise of Warrants.


   
                           3.1 Cash Exercise. The Warrants initially are
exercisable at a price of $8.10 per Share, payable in cash or by check to the
order of the Company, or any combination of cash or check, subject to adjustment
as provided in Article 8 hereof. Upon surrender of the Warrant Certificate with
the annexed Form of Election to Purchase duly executed, together with payment of
the Exercise Price (as hereinafter defined) for the Shares purchased, at the
Company's principal offices in Texas
    

                                       -2-



<PAGE>



(presently located at 800 West 9th Avenue, Amarillo, Texas 79101) the registered
holder of a Warrant Certificate ("Holder" or "Holders") shall be entitled to
receive a certificate or certificates for the Shares so purchased. The purchase
rights represented by each Warrant Certificate are exercisable at the option of
the Holder hereof, in whole or in part (but not as to fractional shares of the
Common Stock). In the case of the purchase of less than all the Shares
purchasable under any Warrant Certificate, the Company shall cancel said Warrant
Certificate upon the surrender thereof and shall execute and deliver a new
Warrant Certificate of like tenor for the balance of the Shares purchasable
thereunder.

                           3.2 Cashless Exercise. At any time during the Warrant
Exercise Term, the Holder may, at its option, exchange this Warrant, in whole or
in part (a "Warrant Exchange"), into the number of Shares determined in
accordance with this Section 3.2, by surrendering this Warrant at the principal
office of the Company or at the office of its transfer agent, accompanied by a
notice stating such Holder's intent to effect such exchange, the number of
Shares to be exchanged and the date on which the Holder requests that such
Warrant Exchange occur (the "Notice of Exchange"). The Warrant Exchange shall
take place on the date specified in the Notice of Exchange or, if later, the
date the Notice of Exchange is received by the Company (the "Exchange Date").
Certificates for the Shares issuable upon such Warrant Exchange and, if
applicable, a new warrant of like tenor evidencing the balance of the Shares
remaining subject to this

                                       -3-


<PAGE>



Warrant, shall be issued as of the Exchange Date and delivered to the Holder
within three (3) days following the Exchange Date. In connection with any
Warrant Exchange, this Warrant shall represent the right to subscribe for and
acquire the number of Shares (rounded to the next highest integer) equal to (i)
the number of Shares specified by the Holder in its Notice of Exchange (the
"Total Number") less (ii) the number of Shares equal to the quotient obtained by
dividing (A) the product of the Total Number and the existing Exercise Price (as
hereinafter defined) by (B) the current market value of a share of Common Stock.

                  4.       Issuance of Certificates.
                  
                  Upon the exercise of the Warrants, the issuance of
certificates for the Shares shall be made forthwith (and in any event within
three business days thereafter) without charge to the Holder thereof including,
without limitation, any tax which may be payable in respect of the issuance
thereof, and such certificates shall (subject to the provisions of Article 5
hereof) be issued in the name of, or in such names as may be directed by, the
Holder thereof; provided, however, that the Company shall not be required to pay
any tax which may be payable in respect of any transfer involved in the issuance
and delivery of any such certificates in a name other than that of the Holder
and the Company shall not be required to issue or deliver such certificates
unless or until the person or persons requesting the issuance thereof shall have
paid to the Company the amount of

                                       -4-



<PAGE>



such tax or shall have established to the satisfaction of the Company that such
tax has been paid.

                  The Warrant Certificates and the certificates representing the
Shares shall be executed on behalf of the Company by the manual or facsimile
signature of the present or any future Chairman or Vice Chairman of the Board of
Directors or President or Vice President of the Company under its corporate seal
reproduced thereon, attested to by the manual or facsimile signature of the
present or any future Secretary or Assistant Secretary of the Company. Warrant
Certificates shall be dated the date of execution by the Company upon initial
issuance, division, exchange, substitution or transfer.

                  The Warrant Certificates and, upon exercise of the Warrants,
in part or in whole, certificates representing the Shares shall bear a legend
substantially similar to the following:

         "The securities represented by this certificate and the other
         securities issuable upon exercise thereof have not been registered
         under the Securities Act of 1933, as amended (the "Act"), and may not
         be offered or sold except (i) pursuant to an effective registration
         statement under the Act, (ii) to the extent applicable, pursuant to
         Rule 144 under the Act (or any similar rule under such Act relating to
         the disposition of securities), or (iii) upon the delivery by the
         holder to the Company of an opinion of counsel, reasonably satisfactory
         to counsel to the Company, stating that an exemption from registration
         under such Act is available."


                                       -5-


<PAGE>

                  5.       Restriction on Transfer of Warrants.

                  The Holder of a Warrant Certificate, by its acceptance
thereof, covenants and agrees that the Warrants are being acquired as an
investment and not with a view to the distribution thereof, and that the
Warrants may not be sold, transferred, assigned, hypothecated or otherwise
disposed of, in whole or in part, for a period of [one (1) year] from the date
hereof, except to officers or partners of the Underwriter or to any member of
the selling group participating in the distribution to the public of the Common
Stock and/or their respective officers or partners.

                  6.       Price.


   
                           6.1 Initial and Adjusted Exercise Price. The initial
exercise price of each Warrant shall be $8.10 per Share. The adjusted exercise
price shall be the price which shall result from time to time from any and all
adjustments of the initial exercise price in accordance with the provisions of
Article 8 hereof.
    

                           6.2 Exercise Price. The term "Exercise Price" herein
shall mean the initial exercise price or the adjusted exercise price, depending
upon the context.

                  7.       Registration Rights.

                           7.1 Registration Under the Securities Act of 1933.
The Warrants and the Shares have not been registered for purposes of public
distribution under the Securities Act of 1933, as amended (the "Act").


                                       -6-


<PAGE>



                           7.2 Registrable Securities. As used herein the term
"Registrable Security" means each of the Warrants, the Shares and any shares of
Common Stock issued upon any stock split or stock dividend in respect of such
Shares; provided, however, that with respect to any particular Registrable
Security, such security shall cease to be a Registrable Security when, as of the
date of determination, (i) it has been effectively registered under the Act and
disposed of pursuant thereto, (ii) registration under the Act is no longer
required for the immediate public distribution of such security or (iii) it has
ceased to be outstanding. The term "Registrable Securities" means any and/or all
of the securities falling within the foregoing definition of a "Registrable
Security." In the event of any merger, reorganization, consolidation,
recapitalization or other change in corporate structure affecting the Common
Stock, such adjustment shall be made in the definition of "Registrable Security"
as is appropriate in order to prevent any dilution or enlargement of the rights
granted pursuant to this Article 7.

                           7.3 Piggyback Registration. If, at any time during
the seven years following the date of this Agreement, the Company proposes to
prepare and file one or more post-effective amendments to the registration
statement filed in connection with the Public Offering or any new registration
statement or post-effective amendments thereto covering equity or debt
securities of the Company, or any such securities of the Company held by its
shareholders (in any such case, other than in connection with a merger,
acquisition or pursuant to Form S-8 or successor form),


                                       -7-



<PAGE>



(for purposes of this Article 7, collectively, a "Registration Statement"), it
will give written notice of its intention to do so by registered mail
("Notice"), at least thirty (30) business days prior to the filing of each such
Registration Statement, to all holders of the Registrable Securities. Upon the
written request of such a holder (a "Requesting Holder"), made within twenty
(20) business days after receipt of the Notice, that the Company include any of
the Requesting Holder's Registrable Securities in the proposed Registration
Statement, the Company shall, as to each such Requesting Holder, use its best
efforts to effect the registration under the Act of the Registrable Securities
which it has been so requested to register ("Piggyback Registration"), at the
Company's sole cost and expense and at no cost or expense to the Requesting
Holders. Notwithstanding the provisions of this Section 7.3, the Company shall
have the right at any time after it shall have given written notice pursuant to
this Section 7.3 (irrespective of whether any written request for inclusion of
such securities shall have already been made) to elect not to file any such
proposed Registration Statement, or to withdraw the same after the filing but
prior to the effective date thereof.

                           7.4      Demand Registration.

                                    (a) At any time during the Warrant Exercise
Term, any "Majority Holder" (as such term is defined in Section 7.4(d) below) of
the Registrable Securities shall have the right (which right is in addition to
the piggyback registration rights provided for under Section 7.3 hereof),
exercisable by written



                                       -8-



<PAGE>

   
notice to the Company (the "Demand Registration Request"), to have the Company
prepare and file with the Securities and Exchange Commission (the "Commission"),
on one occasion, at the sole expense of the Company, a Registration Statement
and such other documents, including a prospectus, as may be necessary (in the
opinion of both counsel for the Company and counsel for such Majority Holder),
in order to comply with the provisions of the Act, so as to permit a public
offering and sale of the Registrable Securities by the holders thereof . Once
effective, the Company will use its best efforts to maintain the effectiveness
of the Registration Statement until the earlier of (i) the date that all of the
Registrable Securities have been sold, or (ii) the date that the holders thereof
receive an opinion of counsel to the Company that all of the Registrable
Securities may be freely traded without registration under the Act, under Rule
144(k) of the Act or otherwise.
    

                                    (b) The Company covenants and agrees to give
written notice of any Demand Registration Request to all holders of the
Registrable Securities within ten (10) days from the date of the Company's
receipt of any such Demand Registration Request. After receiving notice from the
Company as provided in this Section 7.4(b), holders of Registrable Securities
may request the Company to include their Registrable Securities in the
Registration Statement to be filed pursuant to Section 7.4(a) hereof by
notifying the Company of their decision to include such securities within ten
(10) days of their receipt of the Company's notice.

                                       -9-



<PAGE>




   
                                    (c) In addition to the registration rights
provided for under Section 7.3 and subsection (a) of this Section 7.4, at any
time during the Warrant Exercise Term, any Majority Holder (as defined below in
Section 7.4(d)) of Registrable Securities shall have the right, exercisable by
written request to the Company, to have the Company prepare and file with the
Commission, on one occasion in respect of all holders of Registrable Securities,
a Registration Statement so as to permit a public offering and sale of such
Registrable Securities for nine (9) consecutive months, provided, however, that
all costs incident thereto shall be at the expense of the holders of the
Registrable Securities included in such Registration Statement. Once effective,
the Company will use its best efforts to maintain the effectiveness of the
Registration Statement until the earlier of (i) the date that all of the
Registrable Securities have been sold, or (ii) the date that the holders thereof
receive an opinion of counsel to the Company that all of the Registrable
Securities may be freely traded without registration under the Act, under Rule
144(k) of the Act or otherwise.If a Majority Holder shall give notice to the
Company at any time of its or their desire to exercise the registration right
granted pursuant to this Section 7.4(c), then within ten (10) days after the
Company's receipt of such notice, the Company shall give notice to the other
holders of Registrable Securities, advising them that the Company is proceeding
with such 
    

                                      -10-


<PAGE>


registration and offering to include therein the Registrable
Securities of such holders, provided they furnish the Company with such
appropriate information in connection therewith as the Company shall reasonably
request in writing.

                                    (d) The term "Majority Holder" as used in
this Section 7.4 shall mean any holder or any combination of holders of
Registrable Securities, if included in such holders' Registrable Securities are
that aggregate number of Shares (including Shares already issued and Shares
issuable pursuant to the exercise of outstanding Warrants) as would constitute a
majority of the aggregate number of Shares (including Shares already issued and
Shares issuable pursuant to the exercise of outstanding Warrants) included in
all of the Registrable Securities.

                           7.5 Covenants of the Company With Respect to
Registration. The Company covenants and agrees as follows:

                                    (a) In connection with any registration
under Section 7.4 hereof, the Company shall file the Registration Statement as
expeditiously as possible, but in no event later than twenty (20) business days
following receipt of any demand therefor, shall use its best efforts to have any
such Registration Statements declared effective at the earliest possible time,
and shall furnish each holder of Registrable Securities such number of
prospectuses as shall reasonably be requested.

                                    (b) The Company shall pay all costs, fees
and expenses in connection with all Registration Statements filed pursuant to
Sections 7.3 and 7.4(a) hereof including, without


                                      -11-



<PAGE>



limitation, the Company's legal and accounting fees, printing expenses, and blue
sky fees and expenses. The holders of Registrable Securities included in any
Registration Statement filed pursuant to Section 7.4(c) hereof will pay all
costs, fees and expenses in connection with such registration.

                                    (c) The Company will take all necessary
action which may be required in qualifying or registering the Registrable
Securities included in a Registration Statement for offering and sale under the
securities or blue sky laws of such states as are requested by the holders of
such securities, [provided that the Company shall not be obligated to execute or
file any general consent to service of process or to qualify as a foreign
corporation to do business under the laws of any such jurisdiction].

                                    (d) The Company shall indemnify any holder
of the Registrable Securities to be sold pursuant to any Registration Statement
and any underwriter or person deemed to be an underwriter under the Act and each
person, if any, who controls such holder or underwriter or person deemed to be
an underwriter within the meaning of Section 15 of the Act or Section 20(a) of
the Securities Exchange Act of 1934, as amended ("Exchange Act"), against all
loss, claim, damage, expense or liability (including all expenses reasonably
incurred in investigating, preparing or defending against any claim whatsoever)
to which any of them may become subject under the Act, the Exchange Act or
otherwise, arising from such registration statement to the same extent and with
the same effect as the provisions pursuant to which the 



                                      -12-



<PAGE>



Company has agreed to indemnify the Underwriters contained in Section 7 of the
Underwriting Agreement and to provide for just and equitable contribution as
set forth in Section 8 of the Underwriting Agreement.

                                    (e) Any holder of Registrable Securities to
be sold pursuant to a Registration Statement, and its successors and assigns,
shall severally, and not jointly, indemnify, the Company, its officers and
directors and each person, if any, who controls the Company within the meaning
of Section 15 of the Act or Section 20(a) of the Exchange Act, against all loss,
claim, damage or expense or liability (including all expenses reasonably
incurred in investigating, preparing or defending against any claim whatsoever)
to which they may become subject under the Act, the Exchange Act or otherwise,
arising from information furnished in writing by or on behalf of such holder, or
its successors or assigns, for specific inclusion in such Registration Statement
to the same extent and with the same effect as the provisions contained in
Section 7 of the Underwriting Agreement pursuant to which the Underwriters have
agreed to indemnify the Company and to provide for just and equitable
contribution as set forth in Section 8 of the Underwriting Agreement.

                                    (f) Nothing contained in this Agreement
shall be construed as requiring any Holder to exercise his Warrants prior to the
initial filing of any Registration Statement or the effectiveness thereof.

                                    (g) If the Company shall fail to comply with
the provisions of this Article 7, the Company shall, in 


                                      -13-



<PAGE>


addition to any other equitable or other relief available to the holders of
Registrable Securities, be liable for any or all incidental, special and
consequential damages sustained by the holders of Registrable Securities,
requesting registration of their Registrable Securities.

                                    (h) Except as set forth in Section 7.5(j)
hereof, the Company shall not permit the inclusion of any securities other than
the Registrable Securities to be included in any Registration Statement filed
pursuant to Section 7.4 hereof, or permit any other registration statement to be
or remain effective during the effectiveness of a Registration Statement filed
pursuant to Section 7.4 hereof, without the prior written consent of the
Majority Holders, which consent shall not be unreasonably withheld.

                                    (i) The Company shall deliver promptly to
each holder of Registrable Securities participating in the offering in which
such Holder's shares are being registered pursuant to Section 7.3 hereof and
requesting the correspondence and memoranda described in this Section 7.5(i) and
to the managing underwriter, if any, copies of all correspondence between the
Commission and the Company, its counsel or auditors and all memoranda relating
to discussions with the Commission or its staff with respect to the Registration
Statement and permit each holder of Registrable Securities and underwriters to
do such investigation, upon reasonable advance notice, with respect to
information contained in or omitted from the Registration Statement as it deems
reasonably necessary to comply with


                                      -14-



<PAGE>



applicable securities laws or rules of the National Association of Securities
Dealers, Inc. Such investigation shall include access to books, records and
properties and opportunities to discuss the business of the Company with its
officers and independent auditors, all to such reasonable extent and at such
reasonable times and as often as any such holder of Registrable Securities or
underwriter shall reasonably request.

                                    (j) Upon the written request therefor by any
holders of Registrable Securities, the Company shall include in the Registration
Statement covering any of the Registrable Securities any other securities of the
Company held by such holders of Registrable Securities as of the date of filing
of such Registration Statement, including, without limitation, restricted shares
of Common Stock, options, warrants or any other securities convertible into
shares of Common Stock.

                  8. Adjustments of Exercise Price and Number of Shares.

                           8.1 Computation of Adjusted Price. In case the
Company shall at any time after the date hereof pay a dividend in shares of
Common Stock or make a distribution in shares of Common Stock, then upon such
dividend or distribution the Exercise Price in effect immediately prior to such
dividend or distribution shall forthwith be reduced to a price determined by
dividing:

                                    (a) an amount equal to the total number of
shares of Common Stock outstanding immediately prior to such dividend or
distribution multiplied by the Exercise Price in effect immediately prior to
such dividend or distribution, by


                                      -15-



<PAGE>



                                    (b) the total number of shares of Common
Stock outstanding immediately after such issuance or sale.

                           For the purposes of any computation to be made in
accordance with the provisions of this Section 8.1, the Common Stock issuable by
way of dividend or other distribution on any stock of the Company shall be
deemed to have been issued immediately after the opening of business on the date
following the date fixed for the determination of stockholders entitled to
receive such dividend or other distribution.

                           8.2 Subdivision and Combination. In case the Company
shall at any time subdivide or combine the outstanding shares of Common Stock,
the Exercise Price shall forthwith be proportionately decreased in the case of
subdivision or increased in the case of combination.

                           8.3 Adjustment in Number of Shares. Upon each
adjustment of the Exercise Price pursuant to the provisions of this Article 8,
the number of Shares issuable upon the exercise of each Warrant shall be
adjusted to the nearest full Share by multiplying a number equal to the Exercise
Price in effect immediately prior to such adjustment by the number of Shares
issuable upon exercise of the Warrants immediately prior to such adjustment and
dividing the product so obtained by the adjusted Exercise Price.

                           8.4 Reclassification, Consolidation, Merger, etc. In
case of any reclassification or change of the outstanding shares of Common Stock
(other than a change in par value to no par value, or from no par value to par
value, or as a result of a 



                                      -16-



<PAGE>



subdivision or combination), or in the case of any consolidation of the Company
with, or merger of the Company into, another corporation (other than a
consolidation or merger in which the Company is the surviving corporation and
which does not result in any reclassification or change of the outstanding
shares of Common Stock, except a change as a result of a subdivision or
combination of such shares or a change in par value, as aforesaid), or in the
case of a sale or conveyance to another corporation of the property of the
Company as an entirety, the Holders shall thereafter have the right to purchase
the kind and number of shares of stock and other securities and property
receivable upon such reclassification, change, consolidation, merger, sale or
conveyance as if the Holders were the owners of the shares of Common Stock
underlying the Warrants immediately prior to any such events at a price equal to
the product of (x) the number of shares issuable upon exercise of the Warrants
and (y) the Exercise Price in effect immediately prior to the record date for
such reclassification, change, consolidation, merger, sale or conveyance as if
such Holders had exercised the Warrants.

                           8.5 Determination of Outstanding Shares of Common
Stock. The number of shares of Common Stock at any one time outstanding shall
include the aggregate number of shares issued or issuable upon the exercise of
options, rights, warrants and upon the conversion or exchange of convertible or
exchangeable securities.

                           8.6 Dividends and Other Distributions with Respect to
Outstanding Securities. In the event that the Company


                                      -17-



<PAGE>


shall at any time prior to the exercise of all Warrants declare a dividend
(other than a dividend consisting solely of shares of Common Stock or a cash
dividend or distribution or otherwise distribute to its shareholders any monies,
assets, property, rights, evidences of indebtedness, securities (other than
shares of Common Stock), whether issued by the Company or by another person or
entity, or any other thing of value, the Holder or Holders of the unexercised
Warrants shall thereafter be entitled, in addition to the shares of Common Stock
or other securities receivable upon the exercise thereof, to receive, upon the
exercise of such Warrants, the same monies, property, assets, rights, evidences
of indebtedness, securities or any other thing of value that they would have
been entitled to receive at the time of such dividend or distribution. At the
time of any such dividend or distribution, the Company shall make appropriate
reserves to ensure the timely performance of the provisions of this Subsection
8.6.

                           8.7 Subscription Rights for Shares of Common Stock or
Other Securities. In the case the Company or an affiliate of the Company shall
at any time after the date hereof and prior to the exercise of all the Warrants
issue any rights to subscribe for shares of Common Stock or any other securities
of the Company or of such affiliate to all the shareholders of the Company, the
Holders of the unexercised Warrants shall be entitled, in addition to the shares
of Common Stock or other securities receivable upon the exercise of the
Warrants, to 


                                      -18-



<PAGE>



receive such rights at the time such rights are distributed to the other
shareholders of the Company.

                  9.       Exchange and Replacement of Warrant Certificates.

                  Each Warrant Certificate is exchangeable without expense, upon
the surrender hereof by the registered Holder at the principal executive office
of the Company, for a new Warrant
Certificate of like tenor and date representing in the aggregate the right to
purchase the same number of Shares in such denominations as shall be designated
by the Holder thereof at the time of such surrender.

                  Upon receipt by the Company of evidence reasonably
satisfactory to it of the loss, theft, destruction or mutilation of any Warrant
Certificate, and, in case of loss, theft or destruction, of indemnity or
security reasonably satisfactory to it, and reimbursement to the Company of all
reasonable expenses incidental thereto, and upon surrender and cancellation of
the Warrants, if mutilated, the Company will make and deliver a new Warrant
Certificate of like tenor, in lieu thereof.

                  10.      Elimination of Fractional Interests.

                  The Company shall not be required to issue certificates
representing fractions of shares of Common Stock and shall not be required to
issue scrip or pay cash in lieu of fractional interests, it being the intent of
the parties that all fractional interests shall be eliminated by rounding any
fraction up to the nearest whole number of shares of Common Stock.


                                      -19-



<PAGE>



                  11.      Reservation and Listing of Securities.

                  The Company shall at all times reserve and keep avail able out
of its authorized shares of Common Stock, solely for the purpose of issuance
upon the exercise of the Warrants, such number of shares of Common Stock as
shall be issuable upon the exercise thereof. The Company covenants and agrees
that, upon exercise of the Warrants and payment of the Exercise Price therefor,
all shares of Common Stock issuable upon such exercise
shall be duly and validly issued, fully paid, non-assessable and not subject to
the preemptive rights of any shareholder. As long as the Warrants shall be
outstanding, the Company shall use its best efforts to cause all shares of
Common Stock issuable upon the exercise of the Warrants to be listed on or
quoted by NASDAQ or listed on such national securities exchanges as requested by
the Underwriter.

                  12.      Notices to Warrant Holders.

                  Nothing contained in this Agreement shall be construed as
conferring upon the Holder or Holders the right to vote or to consent or to
receive notice as a shareholder in respect of any meetings of shareholders for
the election of directors or any other matter, or as having any rights
whatsoever as a shareholder of the Company. If, however, at any time prior to
the expiration of the Warrants and their exercise, any of the following events
shall occur:

                                    (a) the Company shall take a record of the
                  holders of its shares of Common Stock for the purpose of
                  entitling them to receive a dividend or distribution


                                      -20-



<PAGE>



                  payable otherwise than in cash, or a cash dividend or
                  distribution payable otherwise than out of current or retained
                  earnings, as indicated by the accounting treatment of such
                  dividend or distribution on the books of the Company; or

                                    (b)     the Company shall offer to all the
                  holders of its Common Stock any additional shares of
                  capital stock of the Company or securities convertible
                  into or exchangeable for shares of capital stock of the
                  Company, or any option, right or warrant to subscribe
                  therefor; or

                                    (c) a dissolution, liquidation or winding up
                  of the Company (other than in connection with a consolidation
                  or merger) or a sale of all or substantially all of its
                  property, assets and business as an entirety shall be
                  proposed; or

                                    (d) reclassification or change of the
                  outstanding shares of Common Stock (other than a change in par
                  value to no par value, or from no par value to par value, or
                  as a result of a subdivision or combination), consolidation of
                  the Company with, or merger of the Company into, another
                  corporation (other than a consolidation or merger in which the
                  Company is the surviving corporation and which does not result
                  in any reclassification or change of the outstanding shares of
                  Common Stock, except a change as a result of a subdivision or
                  combination of such shares or a change in par

                                      -21-


<PAGE>



                  value, as aforesaid), or a sale or conveyance to another
                  corporation of the property of the Company as an entirety is
                  proposed; or

                                    (e) The Company or an affiliate of the
                  Company shall propose to issue any rights to subscribe for
                  shares of Common Stock or any other securities of the Company
                  or of such affiliate to all the shareholders of the Company;

then, in any one or more of said events, the Company shall give written notice
of such event at least fifteen (15) days prior to the date fixed as a record
date or the date of closing the transfer books for the determination of the
shareholders entitled to such dividend, distribution, convertible or
exchangeable securities or subscription rights, options or warrants, or entitled
to vote on such proposed dissolution, liquidation, winding up or sale. Such
notice shall specify such record date or the date of closing the transfer books,
as the case may be. Failure to give such notice or any defect therein shall not
affect the validity of any action taken in connection with the declaration or
payment of any such dividend or distribution, or the issuance of any convertible
or exchangeable securities or subscription rights, options or warrants, or any
proposed dissolution, liquidation, winding up or sale.

                  13.      Notices.

                  All notices, requests, consents and other communications
hereunder shall be in writing and shall be deemed to have

                                      -22-


<PAGE>



been duly made when delivered, or mailed by registered or certified mail,
return receipt requested:

                                    (a)     If to a registered Holder of the
                  Warrants, to the address of such Holder as shown on the
                  books of the Company; or

                                    (b) If to the Company, to the address set
                  forth in Section 3 of this Agreement or to such other address
                  as the Company may designate by notice to the Holders.

                  14.      Supplements and Amendments.

                  The Company and the Underwriter may from time to time
supplement or amend this Agreement without the approval of any Holders of
Warrant Certificates in order to cure any ambiguity, to correct or supplement
any provision contained herein which may be defective or inconsistent with any
provisions herein, or to make any other provisions in regard to matters or
questions arising hereunder which the Company and the Underwriter may deem
necessary or desirable and which the Company and the Underwriter deem not to
adversely affect the interests of the Holders of Warrant Certificates.

                  15.      Successors.

                  All the covenants and provisions of this Agreement by or for
the benefit of the Company and the Holders inure to the benefit of their
respective successors and assigns hereunder.

                  16.      Termination.

                  This Agreement shall terminate at the close of business on
__________, 2004. Notwithstanding the foregoing, this Agree-



                                      -23-



<PAGE>



ment will terminate on any earlier date when all Warrants have been exercised
and all the Shares issuable upon exercise of the Warrants have been resold to
the public; provided, however, that the provisions of Section 7 shall survive
such termination until the close of business on _________, 2007.

                  17.      Governing Law.

                  This Agreement and each Warrant Certificate issued hereunder
shall be deemed to be a contract made under the laws of the State of New York
and for all purposes shall be construed in
accordance with the laws of said State.

                  18.      Benefits of This Agreement.

                  Nothing in this Agreement shall be construed to give to any
person or corporation other than the Company and the Underwriter and any other
registered holder or holders of the Warrant Certificates, Warrants or the Shares
any legal or equitable right, remedy or claim under this Agreement; and this
Agreement shall be for the sole and exclusive benefit of the Company and the
Underwriter and any other holder or holders of the Warrant Certificates,
Warrants or the Shares.

                  19.      Counterparts.

                  This Agreement may be executed in any number of counterparts
and each of such counterparts shall for all purposes be deemed to be an
original, and such counterparts shall together constitute but one and the same
instrument.

                                      -24-



<PAGE>



                  IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed, as of the day and year first above written.

[SEAL]                                    AMARILLO BIOSCIENCES, INC.

                                          By:__________________________________
                                             Name:
                                             Title:

Attest:

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


                                          WHALE SECURITIES, CO., L.P.
                                          By:  Whale Securities Corp.,
                                               General Partner

                                          By:__________________________________
                                             Name:  William G. Walters
                                             Title: Chairman

                                      -25-



<PAGE>



                                                                       EXHIBIT A

THE WARRANTS REPRESENTED BY THIS CERTIFICATE AND THE OTHER SECURITIES ISSUABLE
UPON EXERCISE THEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED (THE "ACT"), AND MAY NOT BE OFFERED OR SOLD EXCEPT (i) PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT, (ii) TO THE EXTENT APPLICABLE,
PURSUANT TO RULE 144 UNDER SUCH ACT (OR ANY SIMILAR RULE UNDER SUCH ACT RELATING
TO THE DISPOSITION OF SECURITIES), OR (iii) UPON THE DELIVERY BY THE HOLDER TO
THE COMPANY OF AN OPINION OF COUNSEL, REASONABLY SATISFACTORY TO COUNSEL FOR THE
COMPANY, STATING THAT AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT IS
AVAILABLE.

THE TRANSFER OR EXCHANGE OF THE WARRANTS REPRESENTED BY THIS CERTIFICATE IS
RESTRICTED IN ACCORDANCE WITH THE WARRANT AGREEMENT REFERRED TO HEREIN.

                            EXERCISABLE ON OR BEFORE
                    5:00 P.M., NEW YORK TIME, _________, 199_

No. W-                                                         _______ Warrants

                               WARRANT CERTIFICATE

   
                  This Warrant Certificate certifies that _______________
____________ or registered assigns, is the registered holder of _______ Warrants
to purchase, at any time from _______, 1996 until 5:00 P.M. New York City time
on ________, 2001 ("Expiration Date"), up to 200,000 shares ("Shares") of
fully-paid and non-assessable common stock, $.01 par value ("Common Stock"), of
Amarillo Biosciences, Inc., a Texas corporation (the "Company"), at the initial
exercise price, subject to adjustment in certain events (the "Exercise Price"),
of $8.10 per Share upon surrender of this Warrant Certificate and payment of the
Exercise Price at an office or agency of the Company, but subject to the
conditions set forth herein and in the warrant agreement dated as of
____________, 1996 between the Company and Whale Securities Co., L.P. (the
"Warrant Agreement"). Payment of the Exercise Price may be made in cash, or by
certified or official bank check in New York Clearing House funds payable to the
order of the Company, or any combination of cash or check.
    

                  No Warrant may be exercised after 5:00 P.M., New York City
time, on the Expiration Date, at which time all Warrants evidenced hereby,
unless exercised prior thereto, shall thereafter be void.

                  The Warrants evidenced by this Warrant Certificate are part of
a duly authorized issue of Warrants issued pursuant to the Warrant Agreement,
which Warrant Agreement is hereby incorporated by reference in and made a part
of this instrument and is hereby referred to in a description of the rights,
limitation of 



<PAGE>




rights, obligations, duties and immunities thereunder of the Company and the
holders (the words "holders" or "holder" meaning the registered holders or
registered holder) of the Warrants.

                  The Warrant Agreement provides that upon the occurrence of
certain events, the Exercise Price and/or number of the Company's securities
issuable thereupon may, subject to certain conditions, be adjusted. In such
event, the Company will, at the request of the holder, issue a new Warrant
Certificate evidencing the adjustment in the Exercise Price and the number
and/or type of securities issuable upon the exercise of the Warrants; provided,
however, that the failure of the Company to issue such new Warrant Certificates
shall not in any way change, alter, or otherwise impair, the rights of the
holder as set forth in the Warrant Agreement.

                  Upon due presentment for registration of transfer of this
Warrant Certificate at an office or agency of the Company, a new Warrant
Certificate or Warrant Certificates of like tenor and evidencing in the
aggregate a like number of Warrants shall be issued to the transferee(s) in
exchange for this Warrant Certificate, subject to the limitations provided
herein and in the Warrant Agreement, without any charge except for any tax, or
other governmental charge imposed in connection therewith.

                  Upon the exercise of less than all of the Warrants evidenced
by this Certificate, the Company shall forthwith issue to the holder hereof a
new Warrant Certificate representing such number of unexercised Warrants.

                  The Company may deem and treat the registered holder(s) hereof
as the absolute owner(s) of this Warrant Certificate (notwithstanding any
notation of ownership or other writing hereon made by anyone), for the purpose
of any exercise hereof, and of any distribution to the holder(s) hereof, and for
all other purposes, and the Company shall not be affected by any notice to the
contrary.

                  All terms used in this Warrant Certificate which are defined
in the Warrant Agreement shall have the meanings assigned to them in the Warrant
Agreement.

                  IN WITNESS WHEREOF, the Company has caused this Warrant
Certificate to be duly executed under its corporate seal.

Dated:  ___________, 1996                         AMARILLO BIOSCIENCES, INC.

[SEAL]                                            By:__________________________
                                                     Name:
                                                     Title:

Attest:

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





<PAGE>



                         [FORM OF ELECTION TO PURCHASE]

                  The undersigned hereby irrevocably elects to exercise the
right, represented by this Warrant Certificate, to purchase _________ Shares and
herewith tenders in payment for such Shares cash or a certified or official bank
check payable in New York Clearing House Funds to the order of
__________________ in the amount of $ , all in accordance with the terms hereof.
The undersigned requests that a certificate for such Shares be registered in the
name of , whose address is __________________, and that such Certificate be
delivered to __________________, whose address is _____________.

Dated:                                            Signature:____________________

                                                  (Signature must conform in all
                                                  respects to name of holder as
                                                  specified on the face of the
                                                  Warrant Certificate.)

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

                        --------------------------------
                        (Insert Social Security or Other
                          Identifying Number of Holder)



<PAGE>




                              [FORM OF ASSIGNMENT]

             (To be executed by the registered holder if such holder
                  desires to transfer the Warrant Certificate.)

                  FOR VALUE RECEIVED __________________________________________

hereby sells, assigns and transfers unto
_______________________________________________________________________________
(Please print name and address of transferee)

this Warrant Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint _______________, Attorney, to
transfer the within Warrant Certificate on the books of the within-named
Company, with full power of substitution.

Dated:                                            Signature:____________________

                                                  (Signature must conform in all
                                                  respects to name of holder as
                                                  specified on the face of the
                                                  Warrant Certificate)

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

- -------------------------------
(Insert Social Security or Other
Identifying Number of Assignee)




<PAGE>
                                                                     Exhibit 5.1
           

                                                                    July 1, 1996



Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.  20549

Gentlemen:

                  We have acted as counsel to Amarillo Biosciences, Inc., a
Texas corporation (the "Company"), in connection with the Registration Statement
on Form SB-2 ("Registration No. 333-04413) (the "Registration Statement") under
the Securities Act of 1933, as amended, relating to (a) 2,300,000 shares of the
Company's common stock, par value $.01 per share (the "Shares"), including
300,000 Shares to cover the Underwriter's over-allotment option, (b) the
Underwriter's Warrant to Purchase up to 200,000 Shares ("Warrants") and (c)
200,000 Shares which may be issued and sold upon exercise of the Warrants.

                  In connection with this opinion, we have examined the
originals, or copies, certified or otherwise identified to our satisfaction, of
all such records, agreements, instruments and documents as we have deemed
relevant or necessary as the basis for the opinions hereinafter expressed. In
making such examinations, we have assumed the authenticity of all documents
submitted to us as originals, the conformity to authentic originals of all
documents submitted to us as copies, the completeness of all documents furnished
to us and the genuineness of all signatures of the respective parties to such
documents. As to various questions of fact relevant to our opinion, we have
relied where appropriate and without further investigation on our part upon
certificates of public officials and statements or certificates of officers or
representatives of the Company and others. Insofar as this opinion relates to
securities to be issued in the future, we have assumed that all applicable laws,
regulations and rules in effect at the time of such issuance are the same as
those in effect on the date hereof.

                  Based upon and subject to the foregoing, we are of the opinion
that the Shares (including the Shares issuable upon exercise of the Warrants),
when issued and delivered against payment therefor in accordance with the terms
of the Registration Statement, will be legally

                                      -1-
<PAGE>

Securities and Exchange Commission
July 1, 1996
Page 2


issued, fully paid and nonassessable and the Warrants, when issued in accordance
with the terms of the Registration Statement, will be legally issued.

                  In rendering the foregoing opinion we have relied upon the
opinion of Morris, Moore, Moss & Douglass, P.C., a copy of which is attached
hereto.

                  We consent to the filing of this opinion as Exhibit 5 to the
Registration Statement and we further consent to the reference made to us under
the caption "Legal Matters" in the Registration Statement.


                                               Very truly yours,

                                               LOWENTHAL, LANDAU, FISCHER &
                                                 BRING, P.C.


                                               By:/s/ Jay Weil
                                                  -----------------------------



                                      -2-
<PAGE>

                                                                   June 28, 1996



Amarillo Biosciences, Inc.
800 West 9th Avenue
Amarillo, Texas  79101

Lowenthal Landau Fischer & Bring, P.C.
250 Park Avenue
New York, New York  10177

Gentlemen:

                  We have acted as counsel to Amarillo Biosciences, Inc., a
Texas corporation (the "Company"), in connection with the Registration Statement
on Form SB-2 (the "Registration Statement") under the Securities Act of 1933, as
amended, relating to an aggregate of 2,500,000 shares of Common Stock, $.01 par
value per share, of the Company (the "Shares") including an aggregate of 200,000
Shares that are issuable upon exercise of certain warrants to purchase Shares.

                  In connection with this opinion, we have examined the
originals, or copies, certified or otherwise identified to our satisfaction, of
all such records, agreements, instruments and documents as we have deemed
relevant or necessary as the basis for the opinions hereinafter expressed. In
making such examinations, we have assumed the authenticity of all documents
submitted to us as originals, the conformity to authentic originals of all
documents submitted to us as copies, the completeness of all documents furnished
to us and the genuineness of all signatures of the respective parties to such
documents. As to various questions of fact relevant to our opinion, we have
relied where appropriate and without further investigation on our part upon
certificates of public officials and statements or certificates of officers or
representatives of the Company and others. Insofar as this opinion relates to
securities to be issued in the future, we have assumed that all applicable laws,
regulations and rules in effect at the time of such issuance are the same as
those in effect on the date hereof.


                                      -3-
<PAGE>

Securities and Exchange Commission
June 28, 1996
Page 2


                  Based upon and subject to the foregoing, we are of the opinion
that the Shares (including the Shares issuable upon exercise of warrants), when
issued and delivered against payment therefor in accordance with the terms of
the warrants under which they are issued and in accordance with the terms of the
Registration Statement, will be legally issued, fully paid and nonassessable.

                  Lowenthal, Landau, Fischer & Bring, P.C. may rely upon this
opinion in giving its opinion to the Securities and Exchange Commission
concerning the subject matter contained herein and we consent to the filing of
this opinion as an exhibit to the Registration Statement.

                  The law covered by the opinion expressed herein is limited to
the corporate laws of the State of Texas.

                                          Very truly yours,

                                          Morris, Moore, Moss & Douglass, P.C.


 
                                      -4-





<PAGE>
                                                                   Exhibit 10.23

                            INDEMNIFICATION AGREEMENT

                  This INDEMNIFICATION AGREEMENT dated as of ________ ___, 1996
by and among Amarillo Biosciences, Inc., a Texas corporation (the "Company"),
and Hayashibara Biochemical Laboratories, Inc. ("HBL").

                              W I T N E S S E T H:

                  WHEREAS:

                  A. HBL manufactures and makes available to the Company,
pursuant to certain license agreements, a certain form of alpha interferon (the
"Product") which the Company currently is using for research and development in
the United States and elsewhere and for marketing in certain foreign countries;
and

                  B. The product is patent protected in Japan and elsewhere; and

                  C. Hoffman La Roche, Inc. ("Roche") is the owner of United
States Patent No. 4,503,035 (the "035 Patent") pertaining to homogeneous human
alpha interferon; and

                  D. It is to the mutual benefit of the parties hereto that the
Company continue its research and development and marketing efforts, the success
of which would benefit both the Company and HBL; and

                  E. The Company and HBL believe, and have received opinions of
counsel, that the Product, as utilized by the Company, does not infringe upon
the 035 Patent, but the Company is concerned that Roche might initiate one or
more legal proceedings against the Company, claiming patent infringement or
otherwise; and

                  F. In order to induce the Company to continue its research and
development and marketing efforts, HBL has agreed to indemnify, hold harmless
and reimburse the Company against any amounts the Company may be required to pay
as a result of any Roche Claim (as hereinafter defined); and

                  G. HBL wishes to have the Company consummate a proposed public
offering of its securities (the "Offering") by Whale Securities Co., L.P.
("Whale"); and

                  H. In order to facilitate the Offering, HBL has further agreed
to indemnify, hold harmless and reimburse the Company against any amounts the
Company may be required to pay as a result of a Whale Claim (as hereinafter
defined).

                  NOW, THEREFORE, in consideration of the foregoing premises and
the mutual covenants and agreements herein contained, and intending to be
legally bound hereby, the parties hereto agree as follows:




<PAGE>



                  1. (a) HBL agrees to indemnify and hold harmless the Company
and each officer, director, employee and agent of the Company (each an
"Indemnified Party") from and against any and all losses, claims, damages,
expenses or liabilities (including, without limitation, by way of settlement)
and actions in respect thereof, to which they or any of them may become subject
arising out of or based upon or related to (i) any litigation proceeding
commenced or threatened to be commenced by Roche or any affiliate of Roche
against any Indemnified Party or any affiliate of any Indemnified Party relating
to the 035 Patent (a "Roche Claim") and (ii) any indemnification claim against
any Indemnified Party made by Whale pursuant to the underwriting agreement to be
entered into between the Company and Whale in connection with the Offering, but
only to the extent that such indemnification claim results from the assertion of
a Roche Claim (a "Whale Claim"), and will reimburse each of the Indemnified
Parties, if any, for any legal fees or other expenses incurred by them or any of
them in connection with investigating or defending any actions, whether or not
resulting in any liability, insofar as such losses, claims, damages, expenses,
liabilities or actions arise out of or are based upon or related to a Roche
Claim or Whale Claim. HBL agrees to reimburse each Indemnified Party under this
Section 1 for the amount of any loss, claim, damage, expense or liability for
which any such Indemnified Party may be entitled, from time to time, promptly
upon written notice that such loss, claim, damage, expense or liability has been
incurred. Notwithstanding anything to the contrary contained herein, HBL shall
not be liable to reimburse the Company for any loss of revenue or profits
resulting from the issuance by a court of competent jurisdiction of any
injunction against the Company concerning the use, sale and/or marketing of the
Product.

                           (b) HBL shall assume the defense of any action
against any Indemnified Parties (including the employment of counsel reasonably
satisfactory to the Indemnified Parties, whose fees and expenses shall be the
obligation of HBL, as set forth above) insofar as such action relates to an
alleged liability in respect of which indemnity may be sought against HBL. After
notice from HBL of its election to assume the defense of such action, HBL shall
no longer be liable to the Indemnified Parties hereunder for any legal or other
expenses subsequently incurred by them in connection with the defense thereof
other than reasonable costs of investigation; provided, however, that if, in the
reasonable judgment of any Indemnified Party, it is advisable for such
Indemnified Party to be represented by separate counsel because of an existing
or potential conflict of interest which cannot be resolved, the Indemnified
Party shall have the right to employ a separate counsel to represent such
Indemnified Party, in which event the fees and expenses of such separate counsel
shall be borne by HBL.

                           (c) HBL shall also assume the defense of any action
brought by a third party against Whale to the extent that such action is the
basis of a Whale Claim (an action against Whale resulting from the assertion of
a Roche Claim). In such event HBL shall employ counsel reasonably satisfactory
to Whale, which counsel's fees and expenses shall be the obligation of HBL.
After notice from HBL of its election to assume the defense of such action HBL
shall no longer be liable hereunder for any legal or other expenses subsequently
incurred by Whale in connection with the defense thereof other than reasonable
costs of investigation; provided, however, that if Whale and one or more
Indemnified Parties are parties to such action and in the reasonable opinion of
Whale it is advisable for Whale to be represented by separate counsel because of
an existing or potential conflict of interest which cannot be resolved, Whale
shall have the right to employ a separate counsel to represent Whale in such
action, in which event the fees and expenses of such separate counsel shall be
borne by HBL.



                                        2


<PAGE>



                  2. This Agreement may not be amended, terminated or otherwise
modified or rescinded without the written consent of the parties hereto.

                  3. This Agreement shall be construed in accordance with and
governed by the laws of the State of Texas. It constitutes the entire
understanding between the parties hereto with respect to the subject matter
hereof.

                  4. Any controversy or claim arising out of or relating to this
Agreement, or the breach thereof, shall be settled by arbitration in Dallas,
Texas, in accordance with the Commercial Arbitration Rules of the American
Arbitration Association, and judgment upon the award rendered by the
arbitrator(s) may be entered in any court having jurisdiction thereof.

                  5. This Agreement shall bind HBL and its successors and
assigns and shall be for the benefit of the Company and its successors,
including, but not limited to, Whale.

                  IN WITNESS WHEREOF, the parties have executed this
Indemnification Agreement as of the date first above written.

                                      AMARILLO BIOSCIENCES, INC.

                                      By: /s/ Joseph Cummins
                                          -------------------------------------

                                      HAYASHIBARA BIOCHEMICAL
                                      LABORATORIES, INC.

                                      By: /s/ Ken Hayashibara
                                          -------------------------------------



                                        3







<PAGE>

                                                                   Exhibit 10.24
             
                            STOCK PURCHASE AGREEMENT

                  THIS STOCK PURCHASE AGREEMENT ("Agreement") is entered into as
of this the 21st day of September, 1987, by and between AMARILLO CELL CULTURE
COMPANY, INCORPORATED, a Texas corporation ("ACC"), JOSEPH M. CUMMINS
("CUMMINS") and MESA LIMITED PARTNERSHIP, a Delaware limited partnership
("MESA").

                  WHEREAS, ACC desires to issue to MESA and MESA desires to
purchase from ACC shares of ACC's voting common stock, $0.01 par value ("Stock")
upon the terms and conditions hereinafter set forth; and further

                  WHEREAS, the parties hereto desire to evidence their
understandings and obligations by this Agreement;

                  THEREFORE, in consideration of these presents and for other
good and valuable consideration the receipt and sufficiency of which are
evidenced by the execution hereof, the parties hereto agree as follows:

                  1. Initial Stock Purchase.  MESA shall within twenty (20) days
of the execution of this Agreement purchase 18,000 shares of Stock at $17.50
per share, for a total cash consideration of $315,000.00.  The full purchase 
price shall be payable in cash, upon the purchase date.

                  2. Options to Purchase. MESA shall have the option to purchase
additional stock from time to time in the future, as follows: 22,500 shares of
Stock may be purchased by MESA at any time within 18 months from the date of
this Agreement, at the price of $25.00 per share (the "18-month option"). In
addition, MESA shall have the option to purchase 27,000 shares of Stock from the
Company at any time within 36 months from the date of this Agreement, at a price
of $30.00 per share (the "36-month option"). Both the 18-month option and the
36-month option may be exercised in part. In addition, any of the options
provided for in Paragraphs 3 and 4 below, which shall not have been exercised
within the time period therein specified, by the parties entitled thereunder to
exercise such options, may be exercised by MESA, upon the terms and conditions
therein set forth, and MESA shall have an additional 30 days past the option
termination dates therein set forth, within which to exercise such options.

                  Prior to the exercise of any 18-month option or 36-month
option, MESA shall give at least thirty (30) days' prior written notice to ACC,
and upon receipt of such notice, ACC shall immediately forward a copy thereof to
CUMMINS, and to the Other Shareholders, as hereinafter defined. No such notice
by MESA shall be required in connection with its exercise of lapsed options of
CUMMINS or Other Shareholders.


                                       -1-

<PAGE>


                  3. Options Exercisable by Cummins. CUMMINS shall have the
option to purchase (i) 3,030 shares of Stock, at $17.50 per share, within 20
days of the date of this Agreement; (ii) an additional 3,788 shares of Stock at
$25.00 per share, exercisable at any time up to eighteen months after the date
of this Agreement, subject, however, to lapse, as follows: for each share
purchased by MESA under its "18-month options," CUMMINS shall be required, on or
before MESA's option exercise date, to purchase .168 shares of Stock. If CUMMINS
does not purchase such shares on or before said date, then CUMMINS' right to
purchase Stock under this option shall expire, as to said number of shares;
(iii) an additional 4,545 shares of Stock at $30.00 per share, exercisable at
any time up to thirty-six months after the date of this Agreement, subject,
however, to lapse, as follows: for each share purchased by MESA under its
"36-month options," CUMMINS shall be required, on or before MESA's option
exercise date, to purchase .168 shares of Stock. If CUMMINS does not purchase
such shares on or before said date, then CUMMINS' right to purchase Stock under
this option shall expire, as to said number of shares of Stock.

                  Any options timely exercised hereunder, which exceed the
number of options required to be exercised pursuant to the foregoing provisions,
may be charged against options required to be exercised from time to time, so as
to prevent, to the extent thereof, the further lapse of options.

                  In order to enable CUMMINS to exercise such options, and as
part of the consideration for this Agreement, ACC shall loan the purchase price
of such shares to CUMMINS, with funds to be advanced at the time of each
respective option exercise, such loans to be evidenced by promissory notes
executed by CUMMINS, bearing interest at the then applicable federal rate,
determined in accordance with Section 1274(d) of the Internal Revenue Code of
1986, and any successor provisions, and regulations promulgated thereunder, and
providing for quarterly compounding of interest, amortization over a period of
five (5) years, equal quarterly installments of combined principal and interest,
and prepayment without penalty. Said notes shall be secured by security
agreements, and pledges of all the Stock owned by CUMMINS upon the date of said
loan.

                  4. Options to Other Shareholders. Within 60 days of the date
of this Agreement, ACC shall offer to its current shareholders other than MESA
and CUMMINS (herein referred to as the "Other Shareholders") an aggregate of
2,970 shares of Stock at a price of $17.50 per share ("Initial Purchase
Rights"); and those Other Shareholders purchasing thereunder shall also have a
right to purchase (i) an additional 3,712 shares of Stock at $25.00 per share,
exercisable at any time up to eighteen months after the date of this Agreement,

                                       -2-


<PAGE>

subject, however, to lapse, as follows: for each share purchased by MESA under 
its "18-month options," Other Shareholders shall be required, on or before 
MESA's option exercise date, to purchase .165 shares of Stock. If said Other 
Shareholders do not purchase such shares on or before said date, then said 
Other Shareholders' rights to purchase Stock under this option shall expire, as
to said number of shares of Stock; (ii) an additional 4,455 shares of Stock at 
$30.00 per share, exercisable at any time up to thirty-six months after the date
of this Agreement, subject, however, to lapse, as follows: for each share 
purchased by MESA under its "36-month options," Other Shareholders shall be 
required, on or before MESA's option exercise date, to purchase .165 shares of 
Stock. If Other Shareholders do not purchase such shares on or before said date,
then their right to purchase Stock under this option shall expire, as to said 
number of shares of Stock.

                  Any options timely exercised hereunder, which exceed the
number of options required to be exercised pursuant to the foregoing provisions,
may be charged against options required to be exercised from time to time, so as
to prevent, to the extent thereof, the further lapse of options.

                  The 18 and 36 months rights of the Other Shareholders shall be
hereinafter referred to as the "Subsequent Purchase Rights." The Initial
Purchase Rights shall be exercisable by the Other Shareholders in proportion to
their ownership of Stock in ACC, computed prior to the exercise of the Initial
Purchase Rights, and any of such rights not exercised may be exercised within
thirty (30) days of the termination of the sixty (60) day purchase period by
Other Shareholders who did exercise their Initial Purchase Rights. The
Subsequent Purchase Rights shall be exercisable by the Other Shareholders in
proportion to the number of shares they purchased pursuant to the Initial
Purchase Rights.

                  5. Anti-Dilution. In the event the number of issued and
outstanding shares of Stock of ACC should increase, within 36 months from the
date of this Agreement, for any reason (excluding, however, an increase
resulting from the issuance of Shares purchased by MESA, CUMMINS or Other
Shareholders pursuant to the foregoing provisions of this Agreement), including,
without limitation, increases in the number of outstanding Shares due to
additional sales of stock by ACC, stock splits, stock dividends, merger,
consolidation, or any similar event, then all of the options provided to MESA in
this Agreement shall be proportionately increased, and the exercise price
thereof shall be proportionately decreased, so that MESA shall be entitled to
achieve and maintain the same percentage ownership in ACC (or other surviving
company) that it could have achieved and maintained, at the same cost to MESA,
had said event not taken place.

                                       -3-

<PAGE>
                  If, within 36 months from the date of this Agreement, ACC
should effect or undergo a stock split, stock dividend, merger, consolidation or
any similar event, the shares of Stock of ACC, or other surviving company, held
by MESA prior to such event, shall be adjusted in such a manner that MESA's
percentage ownership in ACC, or other surviving company, is not decreased by
virtue of such event.

                  6. Additional Consideration. As additional consideration for
the execution of this Agreement, the parties hereto agree that they will execute
the following instruments, if they are indicated therein as parties,
simultaneous with the execution hereof: Employment Contract, a copy of which is
attached hereto as Exhibit "A," and hereby incorporated by reference; and Voting
Agreement, a copy of which is attached hereto as Exhibit "B," and hereby
incorporated by reference.

                  7. Preconditions. The parties recognize and understand that
certain parties to the Voting Agreement are not parties to this Agreement;
accordingly, this Agreement shall not become binding, and shall be of no force
or effect, until the Voting Agreement shall have been executed by all of the
parties therein named. In addition, if the Articles of Incorporation are not
amended as contemplated in the Voting Agreement, then this Agreement shall
terminate, and shall be of no force or effect.

                  8. Non-Transferability.  All options provided for herein 
shall be non-transferrable.

                  9. Financial Condition; Use of Proceeds. Exhibit "C" to this
Agreement sets forth income statements and balance sheets as of March 31, 1987,
and June 30, 1987, and a schedule of obligations of ACC as of September 11, 1987
(the "Financials"). The Financials are unaudited. The Financials are true and
correct based on the cash basis of accounting, and fairly present the financial
position of ACC as of the dates aforesaid. ACC has no debt, liability or
obligation of any nature, whether accrued, absolute, contingent or otherwise,
and whether due or to become due, that is not reflected or reserved against in
the Financials, excepting only the following: (i) debts, obligations and
liabilities which shall have been disclosed in an Exhibit to this Agreement;
(ii) debts, liabilities or obligations not exceeding $5,000.00 in the aggregate.

                  Exhibit "D" to this Agreement sets forth a one year budget,
being the use ACC proposes to make of the proceeds from the initial stock
purchase provided for in Paragraph 1, above. No expenditure of such funds shall
be made for any purpose not set forth at said Exhibit "D", or for any purpose
set forth at Exhibit "D" in an amount which exceeds the amount set forth therein
by more than five percent (5%), without the prior written consent of either

                                       -4-

<PAGE>

MESA, or that director on the Board of ACC who has been nominated by MESA. In
addition, said $315,000.00, along with any additional amounts received from MESA
pursuant to the exercise of its options as provided for in this Agreement, shall
be placed in a separate bank account of ACC, and not commingled with other funds
of ACC. Checks may be written and draws may be made on said account only upon
signature of two (2) persons, at least one of whom will be nominated by MESA.

                  MESA shall have the right, during business hours, to audit the
books and records of ACC, or to employ independent auditors for such purpose.
ACC shall provide quarterly financial statements to MESA.

                  10. Redemptions and Repurchases. As long as MESA shall be and
remain a shareholder of ACC, ACC shall engage in no repurchase or redemption of
its issued and outstanding shares of Stock, unless such repurchase and/or
redemption is offered, pro rata, to all then existing shareholders, without the
prior written approval of MESA.

                  11. Debt Limit. At no time within 36 months of the date of
this Agreement will ACC borrow funds from any persons or entities, which
borrowing would cause the aggregate, outstanding debt of ACC to exceed
$100,000.00, without the prior written approval of MESA.

                  IN WITNESS WHEREOF, the undersigned have executed this
Agreement as of this the 21st day of September, 1987.

                                   AMARILLO CELL CULTURE
                                   COMPANY, INCORPORATED

                                   By:   s/
                                      -----------------------------------------
                                      President

                                         s/ Joseph M. Cummins
                                      -----------------------------------------
                                      JOSEPH M. CUMMINS

                                    MESA LIMITED PARTNERSHIP

                                    By: PICKENS OPERATING CO.

                                    By:  s/
                                       ----------------------------------------

                                    Name:
                                         --------------------------------------

                                    Title:
                                          -------------------------------------

                                       -5-



<PAGE>

                      


BETWEEN

                        AMARILLO BIOSCIENCES, INC. (ABI)
           a Texas corporation with its principal place of business at
                      800 W. 9th, Amarillo, Texas 79101 USA

                Represented by: Dr. Joseph M. CUMMINS, President

AND

                              VIRBAC S.A. (VIRBAC)
          a French corporation with its principal place of business at
              1 ere Avenue 2065 m - L.I.D. - 06516 Carros - FRANCE

                  Represented by: Mr. Pascal BOISSY, President

WHEREAS

ABI has substantial expertise in the use of the natural human Interferon-alpha
("IFNa") manufactured and used by INTERFERON SCIENCES, INC. for the formulation
of natural IFNa-containing formulation(s) for use in the treatment by injection
of human genital warts in the United States;

ABI has proprietary rights and know-how in the field of formulation
and use of the INTERFERON SCIENCES, INC. Interferon;

ABI has obtained the rightful access to certain patents through the grant of
Exclusive Licenses from University Patents, Inc., a Delaware corporation, on
April 1st, 1984, from the Texas A&M University System (TAMUS) on March 22, 1988
and then as the direct owner of several patents filed or issued in the name of
ABI.

ABI warrants that these patents are genuine, that it has sole title to them,
either as exclusive licensee or as direct owner (except for US Patent No.
5,215,741, of which ABI is a co-owner along with the Estate of Dr. Alan Young,
Deceased; each co-owner has a co-extensive right to license said patent), and
that it has full right, authority and power to enter into this Agreement and
that it is legally as well as contractually authorized to dispose of these
rights.

ABI believes the patents to be valid, and has no reason to believe that they are
not.

                                       -1-

<PAGE>

ABI and INTERFERON SCIENCES, INC., of New Brunswick, New Jersey, USA
(hereinafter "ISI") have heretofore entered into that certain Exclusive 
Manufacturing and Supply Agreement dated October 20, 1989 regarding the supply 
by ISI of ISI Interferon for the manufacture of PRODUCTS for oral use in 
non-human species;

ABI and VIRBAC now desire to promote applications of technology relating to the
oral administration of ISI Interferon in the feline and canine species.

VIRBAC desires to obtain the exclusive right to use, formulate, test and market
ISI Interferon in oral dosage forms for use in both the feline and canine
species, and the exclusive right to sell or otherwise distribute ISI Interferon
to other persons or entities for use in formulation, testing, or marketing of
oral forms labelled for use in feline and/or canine species worldwide on the
basis of the grant of a Research License and Supply Agreement.

ABI and VIRBAC agree that the present Agreement shall be effective on the date
of signature.

THEREFORE IT HAS BEEN FURTHER AGREED AS FOLLOWS:

Article 1: DEFINITION.

As used hereafter, following terms will have the following meaning:

TERRITORY means all countries of the world, except Japan.

LICENSOR means AMARILLO BIOSCIENCES, INC.

AFFILIATE means a corporation, company, partnership, or other business entity
which controls or is controlled by, or is under common control with, the
designated party. In the case of a corporation, "control" means ownership either
directly or indirectly of at least fifty percent (50%) of the shares of stock
entitled to vote for the election of directors.

LICENSEE means VIRBAC SA.

PARTY means LICENSOR or LICENSEE.

PARTIES means LICENSOR and LICENSEE jointly.

ISI means INTERFERON SCIENCES, INC.

COMPOUND means the ISI natural human Interferon-alpha ("IFNa") used by ISI for
the formulation of natural IFNa-containing formulation(s) for use in the
treatment by injection of human genital warts in the United States, presently
under the manufacturing and commercializing approval of the US FDA, and which is
produced by ISI.

                                       -2-

<PAGE>

RESEARCH PROGRAM means any research or application executed by LICENSEE designed
to determine the target indication in the target animal species, the level of
dosage for the PRODUCT to be efficient and safe, as well as the assessment of
the value of the PRODUCT, the definition of the domain.

DEVELOPMENT PROGRAM means any study and development performed by LICENSEE alone
or with the assistance of LICENSOR, when necessary, for the filing and
obtainment of registration in each considered country of the TERRITORY.

LICENSOR TECHNICAL INFORMATION means all information, reports, results,
inventions, licenses, know-how, improvements, materials, and any other technical
and scientific data, specifications and formulae directly related to the
development, regulatory approval, manufacture, testing, use, marketing and/or
sale of COMPOUND, and any non-public information relevant to the business of the
PARTIES which is necessarily disclosed by LICENSOR to LICENSEE during the
LICENSEE'S performance under this Agreement. LICENSOR TECHNICAL INFORMATION
shall include any information belonging to or originating with ISI, and
disclosed by LICENSOR to LICENSEE to enable performance under this Agreement.

LICENSEE TECHNICAL INFORMATION means all information, reports, results,
inventions, licenses, know-how, improvements, materials, and any other technical
and scientific data, specifications and formulae directly related to
development, regulatory approval, manufacture, testing, use, marketing and/or
sale of COMPOUND, and any non-public information relevant to the business of the
PARTIES which is necessarily disclosed by LICENSEE to LICENSOR during the
LICENSOR's performance under this Agreement.

TECHNICAL INFORMATION shall mean both LICENSOR and LICENSEE
TECHNICAL INFORMATION.

LICENSED PATENTS means

         US Patent no. 4,462,985 "Delivery of Biologically Active
         Components" filed by University Patents, Inc. and issued on
         July 31, 1984 and subject to an Exclusive License Agreement
         granted to LICENSOR on April 1st, 1984;

         US Patent no. 4,820,514 "Low Dosage Interferon to Enhance Vaccine
         Efficiency" filed by the Texas A&M University System on December 30,
         1985 and issued on April 11, 1989;

                                       -3-

<PAGE>

         US Patent no. 5,019,382 "Treatment of Immuno-Resistant Disease" filed
         by the Texas A&M University System on January 1st, 1990 and issued on
         May 28, 1991;

         US Patent no. 5,215,741, "Method for Prevention of Parasite
         Infections" filed by ABI on October 30, 1990, and issued on
         June 1, 1993;

         European Patent no. 03431258, "Pharmaceutical Composition
         Containing Interferon for Buccal Administration" filed by ABI
         on November 6, 1987, and issued on March 2, 1994.

         All pending patents, applied for but not yet issued, described
         at Annex 1 to this Agreement;

         And all continuations, divisionals, continuations-in-part, reissues or
         extensions of the above-described patents, and all foreign counterparts
         thereof, with claims dominant of the manufacture, use, or sale of Dog
         Dose(s) or Cat Dose(s) of the COMPOUND.

BULK ISI INTERFERON means COMPOUND provided in a concentrated form for use in
the manufacture of oral dosage formulations labelled for use in canine and
feline species.

DOG DOSE(S) means any approved dosage of COMPOUND to be used orally in the
canine species which dosage shall be determined during the research program
performed by LICENSEE.

CAT DOSE(S) means any approved dosage of COMPOUND to be used orally in the
feline species which dosage shall be determined during the research program
performed by LICENSEE.

PRODUCT(S) means a performant DOSE combined with biologically compatible
excipients designed to treat or prevent by oral dosage forms the target
indications for dog and cat.

PATENT(S) OF THE AGREEMENT means patents which shall be filed and/or issued
based on the results of the research/development program performed by LICENSEE.

Article 2: RESEARCH PROGRAM.

Based on a certain quantity of the COMPOUND to be supplied by LICENSOR to
LICENSEE free of charge, LICENSEE will undertake to engage in a RESEARCH PROGRAM
in order to determine the CAT DOSE and DOG DOSE required to treat or prevent,
once formulated, the target indications.

                                       -4-


<PAGE>

Considering the lack of knowledge and uncertainty of the performance of the
interferon as prevention or treatment of the target indications, it is agreed by
the PARTIES that there is no possibility to determine in advance the time and
funds to be allocated to such RESEARCH PROGRAM.

The research work will be performed and funded by LICENSEE which will have to
demonstrate that the research work is performed in due diligence by showing that
minimum expenditures (not including general administrative overhead) of Fifty
Thousand Dollars ($50,000) per year have been made on the RESEARCH PROGRAM by
LICENSEE, until the DEVELOPMENT PROGRAM shall have been commenced by the filing
of an application for regulatory approval of one or more PRODUCTS in the US.
LICENSEE agrees that the research work will include (but will not necessarily be
limited to) the indication Keratoconjunctivitis Sicca ("KCS"), in the canine
species, and Feline Herpes Virus-1, in the feline species.

Article 3: DEVELOPMENT PROGRAM

In the event that LICENSEE would succeed in elaborating the PRODUCT, then,
LICENSEE shall perform studies, testing, reports and any kind of formalities
necessary to the obtainment of registrations and authorizations to permit the
sale of the PRODUCT in the TERRITORY.

It is agreed that LICENSEE shall emphasize its efforts in order to obtain
registrations in priority in major countries such as the United States, France,
United Kingdom, and Germany.

LICENSEE will work on its own in all the countries of the TERRITORY except in
the United States where LICENSOR shall assist LICENSEE, at LICENSEE's expense,
in obtaining, among others, local authorizations, FDA approvals, and/or USDA
approvals.

LICENSEE will use its best endeavor to file the applications for registration
within the best delay, but shall in no event be considered as responsible for
the administrative delays following the filing of registration applications.

Article 4: CONFIDENTIALITY

LICENSOR owns or has accesses to LICENSOR TECHNICAL INFORMATION, and it is the
intention of LICENSOR to maintain the confidentiality thereof.

LICENSEE owns LICENSEE TECHNICAL INFORMATION, and it is its intention to
maintain the confidentiality thereof.

                                       -5-


<PAGE>

Each PARTY agrees to maintain confidential and secret all LICENSOR or LICENSEE
TECHNICAL INFORMATION which may be disclosed or provided to it by the other
PARTY and that the PARTIES may together subsequently acquire in relation to
PRODUCTS containing the COMPOUND and which is designated in writing by clearly
identifiable legend as being confidential or secret in character.

Each PARTY's obligation to the other (to maintain confidentiality) hereunder
shall terminate with respect to any particular item and only said item of the
disclosing PARTY's TECHNICAL INFORMATION when the recipient PARTY can
demonstrate that such item of information:

         is publicly known and available through some means other than
         by the recipient PARTY's act or omission; or

         was in the recipient PARTY's possession prior to its disclosure by the
         other PARTY, provided that the written evidence of such possession is
         established; or

         has come into the recipient PARTY's possession through a third party
         free of any obligation of confidentiality to the disclosing PARTY,
         where said third PARTY has acquired said information lawfully and not
         under circumstances forbidding its disclosure.

Neither PARTY will permit TECHNICAL INFORMATION or any part thereof to be
disclosed to third PARTIES or to employees except on a "need-to-know" basis and
each will maintain TECHNICAL INFORMATION and/or documents with the same
precautions it uses to safeguard its own TECHNICAL INFORMATION.

Each PARTY will notify the other promptly if it has knowledge that a third party
possesses TECHNICAL INFORMATION of the other PARTY related to PRODUCT based on
COMPOUND.

LICENSEE shall have the right to use LICENSOR's TECHNICAL INFORMATION to the
extent reasonably necessary to accomplish the objectives of this Agreement,
including specifically the right to disclose such information to its AFFILIATES,
actual and potential purchasers or transferees, third-party contract consultants
and scientific investigators (from whom LICENSEE shall secure Confidential
Disclosure Agreements) and to regulatory agencies in support of applications for
regulatory agency approval to make, test and/or sell PRODUCTS based on COMPOUND.

Article 5: LICENSE GRANT

LICENSOR hereby grants to LICENSEE an exclusive License to the LICENSED PATENTS,
and the right to use and sell PRODUCTS as contemplated by this Agreement, and
the right to use LICENSOR TECHNICAL INFORMATION in the manufacture, use and sale
of oral dosage forms labelled or otherwise detailed for use in canine and/or
feline species in the TERRITORY.

                                       -6-


<PAGE>

LICENSOR agrees to allow right of reference to ISI's FDA Biologics Master
File(s) for the COMPOUND and to do such other acts as are reasonably necessary,
and within LICENSOR's control, to facilitate US FDA (or US USDA) approval of 
PRODUCTS containing the COMPOUND for oral use in the feline and/or canine 
species.

The term "exclusive" shall mean that LICENSOR shall not itself use any kind of
natural human Interferon-alpha "IFNa" for oral applications in the canine and
feline field, neither have the right to grant any license rights and/or
distribution rights to use, formulate, sell or have sold any kind of natural
human Interferon-alpha "IFNa" for oral applications in the canine and feline
field in the TERRITORY.

Neither LICENSEE nor any of its Affiliates shall use, test, formulate, market or
otherwise employ COMPOUND for any use or purpose whatsoever, except for the use
of COMPOUND as contemplated by this Agreement, and the marketing of PRODUCT
hereunder, nor shall LICENSEE sell, transfer, or distribute COMPOUND, or
COMPOUND- containing PRODUCTS, to any persons or entities if LICENSEE has any
reason to believe that such persons or entities will use such COMPOUND or
PRODUCTS for purposes not contemplated by this Agreement, or for any species
other than canine or feline.

Article 6: CONSIDERATION

1.       In consideration of such license grant, LICENSEE shall pay to
         LICENSOR:

         (a)      a transfer fee calculated per DOG DOSE and per CAT DOSE
                  as determined in Annex 2.

         (b)      a license payment of $5,000 for consideration for use of
                  the University Patents, Inc. (University of Illinois) US
                  Patent No. 4,462,985 licensed to LICENSOR.

         (c)      a license payment of $5,000 for consideration for use of
                  the various Texas A&M University Patents licensed to
                  LICENSOR.

         (d)      a payment of $5,000 for consideration for use of the COMPOUND
                  and LICENSOR TECHNICAL INFORMATION communicated by ISI to
                  LICENSOR under the Manufacturing and Supply Agreement.

                                       -7-


<PAGE>

         (e)      a research reimbursement payment in the amount of
                  $30,000.

         (f)      a patent expense reimbursement payment in the amount of
                  $99,000.

         Each of the payments described in Paragraphs 1 (b) through (f), above,
         shall be made in three (3) equal installments, to be paid according to
         the following time schedule:

         (a)      the first on June 1, 1996;

         (b)      the second within thirty (30) days of application for approval
                  by the US FDA (or US USDA) for a PRODUCT based on COMPOUND for
                  use in the feline or canine species; and

         (c)      the third within thirty (30) days of obtaining approval
                  in one of the major (U.S. or European Union) countries of
                  the TERRITORY.

2.       Seventy-two thousand dollars ($72,000) of the payments described above
         shall constitute prepayment by LICENSEE of amounts payable by LICENSEE
         under Article 11 of this Agreement; accordingly, after the first launch
         of PRODUCT by LICENSEE, LICENSEE would receive the COMPOUND free of
         charge up to $72,000.

Article 7: PATENTS OF THE AGREEMENT

Any result, improvement, patentable or not, concerning applications, directly
issued from the research and development programs, shall be the exclusive
property of LICENSEE, with the exception of any patentable invention relating to
the use of interferon alpha to treat Keratoconjunctivitis sicca ("KCS"). If such
a patent should issue to ABI at any time during the term of this Agreement, such
patent shall be licensed to VIRBAC under all of the terms and conditions of this
Agreement, and for the duration of the term of this Agreement, for no additional
consideration.

Article 8: PATENT INFRINGEMENT

LICENSOR shall defend at its own expense all infringement suits that may be
brought against LICENSOR on account of the manufacture, use, or sale of the
COMPOUND and/or against LICENSEE in countries where one or more LICENSED PATENTS
have issued, on account of the use of COMPOUND in the manufacture and sale of
PRODUCTS covered by the present Agreement; provided, however, that LICENSOR is
not hereby obligated to defend LICENSEE against any suit against LICENSEE, other
than those arising from LICENSEE's practice of the invention(s) described in one
or more of the LICENSED PATENTS.

                                       -8-


<PAGE>

In the event LICENSEE reasonably believes that one or more of the LICENSED
PATENTS are being infringed by a third party, and in the event that LICENSOR
fails to prosecute an action for infringement, LICENSEE shall have the right but
not the obligation to institute or bring any action or proceeding against any
person other than LICENSOR or its assigns that LICENSEE may be advised to
institute or begin for, or by reasons of, any infringement by other
manufacturers of the COMPOUND and/or raw material similar to the COMPOUND, or
letters-Patent or for unfair trade practices by other manufacturers pertaining
to the patent, and, for that purpose, LICENSEE shall have the right to use the 
name of LICENSOR as a party plaintiff either solely or jointly with LICENSEE's 
name; provided that, in such case, the suit(s) shall be instituted, maintained 
and prosecuted at the cost of LICENSEE, and all sums that may be recovered in 
any suit(s), whether by decree, judgment, settlement, or otherwise, shall be the
sole and exclusive property of LICENSEE.

In the event that LICENSOR would accept to participate with LICENSEE in the
prosecution and filing of a case action then, all sums that would be recovered,
shall be shared between the PARTIES according to their respective financial
participation.

Article 9: SUPPLY OF THE COMPOUND

Subject to the terms and conditions of this Agreement, LICENSOR shall supply
BULK ISI INTERFERON for the manufacture, use, formulation, testing and/or
marketing of oral dosage forms for use in feline and canine species in the
TERRITORY, exclusively to LICENSEE for such use.

In addition, LICENSOR shall provide to LICENSEE such LICENSOR TECHNICAL
INFORMATION as shall be required by LICENSEE for the formulation, testing and/or
marketing of PRODUCT hereunder, including without limitation, the filing of
applications for regulatory approval in countries in the TERRITORY.

Such canine/feline dosage forms shall be subject to resale or other distribution
by LICENSEE to other persons or entities for use, formulation, testing, and/or
marketing, provided, however, that LICENSEE shall not resell the COMPOUND to
other persons or entities for formulation or testing by such other persons or
entities without first obtaining LICENSOR's written approval, which approval
shall not be unreasonably withheld.

Article 10: SALE/PURCHASE - ORDERING

LICENSOR agrees to supply LICENSEE during the term of this Agreement such
quantities of the COMPOUND needed by LICENSEE for research, development,
manufacturing and distribution of the PRODUCTS in the TERRITORY, subject only to
availability of COMPOUND from ISI.

                                       -9-


<PAGE>

In order to enable the LICENSOR to duly plan its production and delivery program
for the COMPOUND, the LICENSEE will place with the LICENSOR firm orders for its
requirements of the COMPOUND at least three (3) months before the intended
delivery date of the relevant quantity.

Before November 1st of each calendar year, LICENSEE will provide LICENSOR with a
non-committal order forecast for the COMPOUND for delivery in the subsequent
calendar year.

LICENSOR shall execute firm orders of LICENSEE, in accordance with the delivery
scheme indicated by LICENSEE within a maximum period of three months and a half,
as of the date of the LICENSEE's order, and may invoice LICENSEE for payment at
any time after shipment of COMPOUND.

LICENSEE undertakes to hold for the COMPOUND reasonable stock to assure smooth
and regular sales in the TERRITORY.

Article 11: PRICES AND PAYMENT

Prices and invoices for the COMPOUND to be supplied by the LICENSOR to the
LICENSEE will be FOB New Brunswick, New Jersey, USA, established in US Dollars
or other currency as indicated and agreed by the PARTIES, and any customs fees
or duties will be the responsibility of LICENSEE.

Prices ruling at the commencement of this Agreement for the COMPOUND will be as
set forth in Annex 2 to this Agreement.

At the end of the RESEARCH PROGRAM the PARTIES agree to revise the above
mentioned price if they need to be readjusted based on the results of the
research work.

Before November 1st of each calendar year, during the term of this Agreement,
the prices for the COMPOUND to be delivered in the subsequent calendar year,
will be fixed in good faith negotiations between the PARTIES, having due regard
to all relevant factors in both sides.

Payment by LICENSEE of the quantities of the COMPOUND supplied by LICENSOR
pursuant to this Agreement will be made by the LICENSEE within sixty (60) days
after the end of the month during which the relevant invoice was presented. The
amount invoiced for COMPOUND shall be $.03 (US) per International Unit based on
the amount of BULK ISI INTERFERON shipped under that invoice. After LICENSEE has
allocated the COMPOUND from such shipment to the respective DOG DOSES and/or CAT
DOSES, LICENSEE will provide to LICENSOR a written record of said dose
allocation, and will pay LICENSOR the amount set forth at Annex 2, less the
amount originally paid upon invoicing ($.03 per IU).

                                      -10-


<PAGE>

Article 12: BOOKS AND RECORDS

LICENSEE shall keep proper books and accounts which clearly indicate the volume
and price of sales and all other financial data and documentation necessary for
calculation of the number of DOG DOSE(S) and CAT DOSE(S) sold by LICENSEE as may
be necessary to determine the amounts due from LICENSEE TO LICENSOR, and from
LICENSOR to the University of ILLINOIS and Texas A&M University.

LICENSEE shall also require its AFFILIATES and its agents to keep books of
accounts, manufacturing and shipping records and to make periodic reports of
same to LICENSEE as necessary and appropriate to enable LICENSEE to calculate
the amounts due in respect to the number of DOG DOSE(S) and CAT DOSE(S).

LICENSOR may nominate an independent public accountant, acceptable to and
approved by LICENSEE which approval shall not be unreasonably withheld, once in
each calendar year, to inspect the books of account of LICENSEE and other
records and reports deemed reasonably necessary for inspection by said
accountant during reasonable business hours for the purpose of verifying the
accuracy of the reports and payments made by LICENSEE.

Such accountant shall not disclose any information related to LICENSEE's
financial matters but shall certify to LICENSOR the accuracy of the reports and
payments made by LICENSEE in accordance with this Agreement.

ALL fees charged by such accountant shall be paid by LICENSOR.

LICENSOR shall not make any public disclosure of the LICENSEE reports or
payments referred to in this Agreement.

To the extent disclosure of such information to a third party is required in the
ordinary course of LICENSOR's business, such disclosure shall be made subject to
the recipient's agreement to hold such information in confidence.

Article 13: SALES PROMOTION

LICENSEE shall be fully responsible for the promotion of the PRODUCTS.

Article 14: WARRANTY

LICENSOR warrants that the COMPOUND supplied by LICENSOR hereunder is in
conformity with LICENSOR's standard specifications and that it is suitable for
the applications indicated in writing by LICENSOR.

                                      -11-

<PAGE>

LICENSOR agrees to hold LICENSEE harmless from any claim or suit, for any loss
or damage resulting from manufacturing quality of the COMPOUND supplied by
LICENSOR, the non-conformity of the COMPOUND with LICENSOR's manufacturing or
handling specifications or as a result of adverse reactions or effects in
connection with the COMPOUND due to incorrect information or instructions given
by LICENSOR with respect to the COMPOUND or due to the fact that the COMPOUND
appears to be unfit for their specific purpose as indicated and recommended by
LICENSOR.

LICENSEE shall hold LICENSOR harmless from any claim or suit for loss or damage
which may result from handling, storage, use, application, development, or
administration of the COMPOUND due to negligence or default of LICENSEE and/or
non respect of LICENSOR's relevant instructions and specifications, and/or due
to LICENSEE's misrepresentation concerning the COMPOUND and/or PRODUCTS's
characteristics not in accordance with LICENSOR's specifications.

LICENSEE shall promptly notify LICENSOR of any loss or damage suffered by third
parties and allegedly attributed to the COMPOUND.

LICENSOR undertakes to assist LICENSEE in dealing with the relative claim to
such extent as may be appropriate under the circumstances.

Neither LICENSOR nor LICENSEE will settle any claim without the other PARTY's
prior consent, which shall not be withheld unless that PARTY can show to the
other PARTY's reasonable satisfaction that the conclusion of such settlement
would greatly affect its interests.

Each PARTY will expend its best efforts to procure and maintain adequate product
liability insurance with a reputable insurance company, subject to the
following: Such coverage shall only be required and mandatory for ABI in the
territory on the date of the first launching of PRODUCT in the market or such
contemplated territory.

Article 15: PRODUCTS REGISTRATION

LICENSEE shall obtain Health Registrations, and any amendments thereof, as may
be required for the sale of the PRODUCTS in the TERRITORY, in LICENSEE's name,
such registrations being LICENSEE's property.

Article 16: TRADEMARKS

LICENSEE shall commercialize the PRODUCT(S) in the TERRITORY under LICENSEE's
own trademarks and LICENSOR hereby acknowledges that the said trademarks are the
sole property of LICENSEE.

Article 17: TERM-DURATION

Unless sooner terminated as hereinafter provided, this Agreement shall remain in
effect for a period of fifteen (15) years from the date of signature of the
present Agreement. After said initial term, the Agreement may be followed by an
Exclusive Supply Agreement, subject to the prior written consent of both
PARTIES.

                                      -12-
<PAGE>
Article 18: TERMINATION

1.       In the event that LICENSEE defaults in any obligation hereunder or
         fails to pay any payment due, and such default shall not be cured
         within sixty (60) days after written notice from LICENSOR to LICENSEE
         specifying the nature of the default, LICENSOR may terminate this
         Agreement or demand specific performance in term of payment.

2.       In the event that LICENSOR defaults in any obligation hereunder and
         such default is not be cured within sixty (60) days after written
         notice from LICENSEE to LICENSOR specifying the nature of the default,
         LICENSEE may terminate this Agreement, or may demand specific
         performance.

3.       Any termination pursuant to this Article shall not relieve LICENSOR of
         any obligation to fill purchase orders placed with LICENSOR prior to
         termination.

         The exercise by either PARTY of any right of termination shall not
         constitute a waiver of any other rights or remedies available to such
         PARTY for violation of the terms of this Agreement or under applicable
         Law.

Article 19: MISCELLANEOUS

Survival: Articles 4, 11 and 18.3 shall survive any termination of
this Agreement.

Force Majeure: The failure of LICENSEE, LICENSOR, or any of their AFFILIATES to
take any act required by the present Agreement, if occasioned by an Act of God
or the public enemy, fire, explosion, earthquake, perils of the sea, floods,
drought, war, sabotage, accident, embargo or any circumstance of like or
different character beyond the reasonable control of the PARTY so failing or by
the interruption or delay in transportation, inadequacy, or sabotage or failure
of the supply of materials and/or equipment, equipment breakdown, labor trouble
or compliance with order, direction, action or request of any governmental
officer, department or agency and hereafter arises, shall not subject either
PARTY to any liability to the other.

Dispute: Any dispute shall be submitted to mediation and in the event that no
settlement would be reached, then, each PARTY will have the possibility to bring
the case either before the French jurisdiction when LICENSOR is acting as the
plaintiff or before the US jurisdiction located in the State of TEXAS when
LICENSEE is acting as the plaintiff.

                                      -13-


<PAGE>

Communication: Any payment, notice or other communication required or permitted
to be made or given to either PARTY hereto pursuant to this Agreement shall be 
sufficiently made or given on the date of sending if sent to such PARTY by 
certified or registered mail or by an overnight courier service, postage or 
delivery charge prepaid, or by telex or telefax addressed to it at its address 
set forth, or to such other address(es) as it may designate by written notice 
given to the other PARTY as follows:

In case of VIRBAC:            Dr. Christian Karst, Director Corporate
                              VIRBAC - 13 eme rue - L.I.D. - 06517
                              Carros, France

In case of ABI:               Dr. Joseph M. Cummins, President
                              Amarillo Biosciences, Inc.
                              800 W. 9th
                              Amarillo, Texas 79101 USA

Amendment to Agreement: This Agreement constitutes the entire Agreement between
the PARTIES hereto with respect to all matters herein addressed, and supersedes
all previous arrangements whether written or oral, covering the same subject
matter. Any amendment or modification of this Agreement shall be effective only
if made in writing, and executed by both PARTIES.

Assignment: This Agreement shall not be assignable or subject to sublicense by
LICENSEE to any person or entity other than a LICENSEE AFFILIATE without the
prior written consent of LICENSOR, which consent shall not be unreasonably
withheld. This Agreement shall not be assignable by LICENSOR to any person or
entity without the prior written consent of LICENSEE, which consent shall not be
unreasonably withheld.

Enforceability: If one or more of the provisions of this Agreement shall be held
to be invalid, illegal or unenforceable, the validity legality or enforceability
of the remaining provisions hereof shall not in any way be affected or impaired
thereby. To the extent permitted by law, each PARTY waives any provision of law
which renders any provision herein invalid, illegal or unenforceable in any
respect.

Nature of the Relationship: Nothing herein shall be construed to place the
PARTIES in a relationship of partners or joint venturers, nor does this
Agreement make either PARTY the agent or legal representative of the other for
any purposes whatsoever. The PARTIES further agree that no representation shall
be made by either PARTY that would create an apparent agency, employment,
partnership or joint venture. Neither PARTY shall have the power express or
implied, to obligate or bind the other in any manner whatsoever.

                                      -14-


<PAGE>

Headings: The headings of the several sections of this Agreement are inserted 
for convenience of reference only and are not intended to be a part of or to 
affect the meaning or interpretation of this Agreement.

Waiver: No provision of this Agreement shall be deemed waived, unless such
waiver is in writing and signed by the PARTY against which the waiver is sought
to be enforced. The waiver by either of the PARTIES hereto of any breach of any
provision hereof by the other PARTY shall not be construed to be either a waiver
of any succeeding breach of any such provision or a waiver of the provision
itself.

No third party beneficiary: This Agreement contemplates no third-party
beneficiaries, and no person or entity, other than the PARTIES or their
permitted assignees, shall have any rights whatsoever under this Agreement.

IN WITNESS WHEREOF, the PARTIES hereunto have caused these Heads of Research
License Supply Agreement to be executed in duplicate by their duly authorized
representatives as of the date first above written.

MADE this 20th day of May, 1996, at Carros.

AMARILLO BIOSCIENCES, INC.                VIRBAC S.A.

   /s/ Joseph M. Cummins                            /s/ Pascal Boissy
- -------------------------------           -------------------------------------
Dr. Joseph M. Cummins                     Mr. Pascal Boissy
President                                 President

                                      -15-
<PAGE>

                                     ANNEX 1

                                 PENDING PATENTS

Serial No.        Filing Date       Title   
- ----------        -----------       ----- 

07/875,630        4/28/92           Method of Administering Interferon

08/305,418        9/13/94           Treatment of Immuno-Resistant Disease

DIV of 
08/305,418        6/7/95            Treatment of Bacterial Infection Disease

08/476,621        6/7/95            Treatment of Autoimmune Disorders Disease

08/475,753        6/7/95            Treatment of Hyperallergenic Response

08/479,958        6/7/95            Treatment of Neoplastic Disease


Made this 20th day of May, 1996, at Carros.

AMARILLO BIOSCIENCES, INC.           VIRBAC S.A.


    /s/ Joseph M. Cummins                        /s/ Pascal Boissy
- -------------------------------     -------------------------------------------
Dr. Joseph M. Cummins               Mr. Pascal Boissy
President                           President

                                      -16-

<PAGE>

                                     ANNEX 2

                          TRANSFER FEES/PRICE PER DOSE

LICENSEE shall pay to LICENSOR the amount of $.42 per oral DOG DOSE and $.42 per
oral CAT DOSE plus a royalty in the following amount, payable with respect to
all amounts received by LICENSEE (or its Affiliate or Assignee) for sale of
PRODUCT:

         For sales outside the United States: 12.4% until expiration
         of the last to expire of the Licensed Patents.

         For sales within (or for shipment into) the United States:
         15.2% until expiration of U.S. Patent no. 4,462,985; and 
         then 12.4% until expiration of the last to expire the 
         Licensed Patents.

Made this 20th day of May, 1996, at Carros.

AMARILLO BIOSCIENCES, INC.            VIRBAC S.A.

    /s/ Joseph M. Cummins                       /s/ Pascal Boissy
- -------------------------------       -----------------------------------------
Dr. Joseph M. Cummins                 Mr. Pascal Boissy
President                             President

                                      -17-




<PAGE>

                                                                  EXHIBIT 23.2 
                       CONSENT OF INDEPENDENT AUDITORS 

We consent to the reference to our firm under the captions "Experts" and 
"Selected Financial Data" and to the use of our report dated February 1, 
1996, except for Note 13, as to which the date is May 14, 1996, in Amendment 
No. 1 to the Registration Statement (Form SB-2) and related Prospectus of 
Amarillo Biosciences, Inc. for the registration of 2,000,000 shares of its 
common stock.
   
                                                 ERNST & YOUNG LLP

    
 

Dallas, Texas 
June 26, 1996 



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