<PAGE>
                                                                   EXHIBIT 10.73


NEITHER THIS SECURITY NOR THE SECURITIES INTO WHICH THIS SECURITY IS EXERCISABLE
HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE
SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM
REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN
AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH APPLICABLE STATE
SECURITIES LAWS AS EVIDENCED BY A LEGAL OPINION OF COUNSEL TO THE TRANSFEROR TO
SUCH EFFECT, THE SUBSTANCE OF WHICH SHALL BE REASONABLY ACCEPTABLE TO THE
COMPANY. THIS SECURITY AND THE SECURITIES ISSUABLE UPON EXERCISE OF THIS
SECURITY MAY BE PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER
LOAN SECURED BY SUCH SECURITIES

                             STOCK PURCHASE WARRANT


                To Purchase __________ Shares of Common Stock of

                                  VIRAGEN, INC.

                  THIS CERTIFIES that, for value received, _________ (the
"HOLDER"), is entitled, upon the terms and subject to the limitations on
exercise and the conditions hereinafter set forth, at any time on or after April
16, 2003 (the "INITIAL EXERCISE DATE") and on or prior to the close of business
on the third anniversary of the Initial Exercise Date (the "TERMINATION DATE")
but not thereafter, to subscribe for and purchase from Viragen, Inc., a
corporation incorporated in the State of Delaware (the "COMPANY"), up to
____________ shares (the "WARRANT SHARES") of Common Stock, par value $0.01 per
share, of the Company (the "COMMON STOCK"). The purchase price of one share of
Common Stock (the "EXERCISE PRICE") under this Warrant shall be $0.0625, subject
to adjustment hereunder. The Exercise Price and the number of Warrant Shares for
which the Warrant is exercisable shall be subject to adjustment as provided
herein. CAPITALIZED TERMS USED AND NOT OTHERWISE DEFINED HEREIN SHALL HAVE THE
MEANINGS SET FORTH IN THAT CERTAIN SECURITIES PURCHASE AGREEMENT (THE "PURCHASE
AGREEMENT"), AS AMENDED, DATED APRIL 16, 2003, BETWEEN THE COMPANY AND THE
INVESTORS SIGNATORY THERETO.




<PAGE>




         1. TITLE TO WARRANT. Prior to the Termination Date and subject to
compliance with applicable laws, this Warrant and all rights hereunder are
transferable, in whole or in part, at the office or agency of the Company by the
Holder in person or by duly authorized attorney, upon surrender of this Warrant
together with the Assignment Form annexed hereto properly endorsed.

         2. AUTHORIZATION OF SHARES. The Company covenants that all Warrant
Shares which may be issued upon the exercise of the purchase rights represented
by this Warrant will, upon exercise of the purchase rights represented by this
Warrant, be duly authorized, validly issued, fully paid and nonassessable and
free from all taxes, liens and charges in respect of the issue thereof (other
than taxes in respect of any transfer occurring contemporaneously with such
issue).

         3. EXERCISE OF WARRANT.

                  (a) Exercise of the purchase rights represented by this
Warrant may be made at any time or times on or after the Initial Exercise Date
and on or before the Termination Date by delivery to the Company of a duly
executed facsimile copy of the Notice of Exercise Form annexed hereto (or such
other office or agency of the Company as it may designate by notice in writing
to the registered Holder at the address of such Holder appearing on the books of
the Company); PROVIDED, HOWEVER, within 5 Trading Days of the date said Notice
of Exercise is delivered to the Company, the Holder shall have surrendered this
Warrant to the Company and the Company shall have received payment of the
aggregate Exercise Price of the shares thereby purchased by wire transfer or
cashier's check drawn on a United States bank. Certificates for shares purchased
hereunder shall be delivered to the Holder within the earlier of (i) 5 Trading
Days after the date on which the Notice of Exercise shall have been delivered by
facsimile copy or (ii) 3 Trading Days from the delivery to the Company of the
Notice of Exercise Form by facsimile copy, surrender of this Warrant and payment
of the aggregate Exercise Price as set forth above ("WARRANT SHARE DELIVERY
DATE"); PROVIDED, HOWEVER, in the event the Warrant is not surrendered or the
aggregate Exercise Price is not received by the Company within 5 Trading Days
after the date on which the Notice of Exercise shall be delivered by facsimile
copy, the Warrant Share Delivery Date shall be extended to the extent such 5
Trading Day period is exceeded. This Warrant shall be deemed to have been
exercised on the date the Notice of Exercise is delivered to the Company by
facsimile copy. The Warrant Shares shall be deemed to have been issued, and
Holder or any other person so designated to be named therein shall be deemed to
have become a holder of record of such shares for all purposes, as of the date
the Warrant has been exercised by payment to the Company of the Exercise Price
and all taxes required to be paid by the Holder, if any, pursuant to Section 5
prior to the issuance of such shares, have been paid. If the Company fails to
deliver to the Holder a certificate or certificates representing the Warrant
Shares pursuant to this Section 3(a) by the Warrant Share Delivery Date, then
the Holder will have the right to rescind such exercise. In addition to any
other rights available to the Holder, if the Company fails to deliver to the
Holder a certificate or certificates representing the Warrant Shares pursuant to
an exercise by the second Trading Day after the Warrant Share Delivery Date, and



                                      -2-
<PAGE>

if after such Trading Day the Holder purchases (in an open market transaction or
otherwise) shares of Common Stock to deliver in satisfaction of a sale by the
Holder of the Warrant Shares which the Holder anticipated receiving upon such
exercise (a "BUY-IN"), then the Company shall (1) pay in cash to the Holder the
amount by which (x) the Holder's total purchase price (including brokerage
commissions, if any) for the shares of Common Stock so purchased exceeds (y) the
amount obtained by multiplying (A) the number of Warrant Shares that the Company
was required to deliver to the Holder in connection with the exercise at issue
times (B) the closing bid price of the Common Stock at the time of the
obligation giving rise to such purchase obligation, and (2) at the option of the
Holder, either reinstate the portion of the Warrant and equivalent number of
Warrant Shares for which such exercise was not honored or deliver to the Holder
the number of shares of Common Stock that would have been issued had the Company
timely complied with its exercise and delivery obligations hereunder. For
example, if the Holder purchases Common Stock having a total purchase price of
$11,000 to cover a Buy-In with respect to an attempted exercise of shares of
Common Stock with a closing bid price on the date of exercise totaled $10,000,
under clause (1) of the immediately preceding sentence the Company shall be
required to pay the Holder $1,000. The Holder shall provide the Company written
notice indicating the amounts payable to the Holder in respect of the Buy-In.
Nothing herein shall limit a Holder's right to pursue any other remedies
available to it hereunder, at law or in equity including, without limitation, a
decree of specific performance and/or injunctive relief with respect to the
Company's failure to timely deliver certificates representing shares of Common
Stock upon exercise of the Warrant as required pursuant to the terms hereof.

                  (b) If this Warrant shall have been exercised in part, the
Company shall, at the time of delivery of the certificate or certificates
representing Warrant Shares, deliver to Holder a new Warrant evidencing the
rights of Holder to purchase the unpurchased Warrant Shares called for by this
Warrant, which new Warrant shall in all other respects be identical with this
Warrant.

                  (c) Notwithstanding anything herein to the contrary, in no
event shall the Holder be permitted to exercise this Warrant for Warrant Shares
to the extent that (i) the number of shares of Common Stock beneficially owned
by such Holder (other than Warrant Shares issuable upon exercise of this
Warrant) plus (ii) the number of Warrant Shares issuable upon exercise of this
Warrant, would be equal to or exceed 4.9999% of the number of shares of Common
Stock then issued and outstanding, including shares issuable upon exercise of
this Warrant held by such Holder after application of this Section 3(c). As used
herein, beneficial ownership shall be determined in accordance with Section
13(d) of the Exchange Act. To the extent that the limitation contained in this
Section 3(c) applies, the determination of whether this Warrant is exercisable
(in relation to other securities owned by the Holder) and of which a portion of
this Warrant is exercisable shall be in the sole discretion of such Holder, and
the submission of a Notice of Exercise shall be deemed to be such Holder's



                                      -3-
<PAGE>

determination of whether this Warrant is exercisable (in relation to other
securities owned by such Holder) and of which portion of this Warrant is
exercisable, in each case subject to such aggregate percentage limitation, and
the Company shall have no obligation to verify or confirm the accuracy of such
determination. Nothing contained herein shall be deemed to restrict the right of
a Holder to exercise this Warrant into Warrant Shares at such time as such
exercise will not violate the provisions of this Section 3(c). The provisions of
this Section 3(c) may be waived by the Holder upon, at the election of the
Holder, not less than 61 days' prior notice to the Company, and the provisions
of this Section 3(c) shall continue to apply until such 61st day (or such later
date, as determined by the Holder, as may be specified in such notice of
waiver). No exercise of this Warrant in violation of this Section 3(c) but
otherwise in accordance with this Warrant shall affect the status of the Warrant
Shares as validly issued, fully-paid and nonassessable.

                  (d) If after one year if there is no effective Registration
Statement registering the Warrant Shares, this Warrant may also be exercised by
means of a "cashless exercise" in which the Holder shall be entitled to receive
a certificate for the number of Warrant Shares equal to the quotient obtained by
dividing [(A-B) (X)] by (A), where:

                  (A) =  the average of the high and low trading prices per
                         share of Common Stock on the Trading Day preceding the
                         date of such election;

                  (B) =  the Exercise Price of the Warrants; and

                  (X) =  the number of Warrant Shares issuable upon exercise
                         of the Warrants in accordance with the terms of this
                         Warrant.

                  (e) Until the Company obtains Shareholder Approval (as defined
in Section 4.16 of the Purchase Agreement), the Holder's right to exercise this
Warrant shall be limited to the extent such exercise causes the issuance to
exceed such Holder's (or its predecessor's) pro-rata portion of the Issuable
Maximum (as defined in Section 4(a)(iii) of the Debenture). The Termination Date
shall be extended for a number of Trading Days equal to the number of days the
exercise of this Warrant is prohibited hereunder.



                                      -4-
<PAGE>

         4. NO FRACTIONAL SHARES OR SCRIP. No fractional shares or scrip
representing fractional shares shall be issued upon the exercise of this
Warrant. As to any fraction of a share which Holder would otherwise be entitled
to purchase upon such exercise, the Company shall pay a cash adjustment in
respect of such final fraction in an amount equal to such fraction multiplied by
the Exercise Price.

         5. CHARGES, TAXES AND EXPENSES. Issuance of certificates for Warrant
Shares shall be made without charge to the Holder for any issue or transfer tax
or other incidental expense in respect of the issuance of such certificate, all
of which taxes and expenses shall be paid by the Company, and such certificates
shall be issued in the name of the Holder or in such name or names as may be
directed by the Holder; PROVIDED, HOWEVER, that in the event certificates for
Warrant Shares are to be issued in a name other than the name of the Holder,
this Warrant when surrendered for exercise shall be accompanied by the
Assignment Form attached hereto duly executed by the Holder; and the Company may
require, as a condition thereto, the payment of a sum sufficient to reimburse it
for any transfer tax incidental thereto.

         6. CLOSING OF BOOKS. The Company will not close its stockholder books
or records in any manner which prevents the timely exercise of this Warrant.

         7. TRANSFER, DIVISION AND COMBINATION.

                  (a) Subject to compliance with any applicable securities laws,
transfer of this Warrant and all rights hereunder, in whole or in part, shall be
registered on the books of the Company to be maintained for such purpose, upon
surrender of this Warrant at the principal office of the Company, together with
a written assignment of this Warrant substantially in the form attached hereto
duly executed by the Holder or its agent or attorney and funds sufficient to pay
any transfer taxes payable upon the making of such transfer. Upon such surrender
and, if required, such payment, the Company shall execute and deliver a new
Warrant or Warrants in the name of the assignee or assignees and in the
denomination or denominations specified in such instrument of assignment, and
shall issue to the assignor a new Warrant evidencing the portion of this Warrant
not so assigned, and this Warrant shall promptly be cancelled. A Warrant, if
properly assigned, may be exercised by a new holder for the purchase of Warrant
Shares without having a new Warrant issued.

                  (b) This Warrant may be divided or combined with other
Warrants upon presentation hereof at the aforesaid office of the Company,
together with a written notice specifying the names and denominations in which
new Warrants are to be issued, signed by the Holder or its agent or attorney.
Subject to compliance with Section 7(a), as to any transfer which may be
involved in such division or combination, the Company shall execute and deliver
a new Warrant or Warrants in exchange for the Warrant or Warrants to be divided
or combined in accordance with such notice.

                  (c) The Company shall prepare, issue and deliver at its own
expense (other than transfer taxes) the new Warrant or Warrants under this
Section 7.



                                      -5-
<PAGE>

                  (d) The Company agrees to maintain, at its aforesaid office,
books for the registration and the registration of transfer of the Warrants.

         8. NO RIGHTS AS SHAREHOLDER UNTIL EXERCISE. Upon the surrender of this
Warrant and the payment of the aggregate Exercise Price (or by means of a
cashless exercise), the Warrant Shares so purchased shall be and be deemed to be
issued to such Holder as the record owner of such shares as of the close of
business on the later of the date of such surrender or payment. This Warrant
does not entitle the Holder to any voting rights or other rights as a
shareholder of the Company prior to such date.

         9. LOSS, THEFT, DESTRUCTION OR MUTILATION OF WARRANT. The Company
covenants that upon receipt by the Company of evidence reasonably satisfactory
to it of the loss, theft, destruction or mutilation of this Warrant or any stock
certificate relating to the Warrant Shares, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to it (which shall
not include the posting of any bond), and upon surrender and cancellation of
such Warrant or stock certificate, if mutilated, the Company will make and
deliver a new Warrant or stock certificate of like tenor and dated as of such
cancellation, in lieu of such Warrant or stock certificate.

         10. SATURDAYS, SUNDAYS, HOLIDAYS, ETC. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday, Sunday or a legal holiday, then such action may be
taken or such right may be exercised on the next succeeding day not a Saturday,
Sunday or legal holiday.

         11. ADJUSTMENTS OF EXERCISE PRICE AND NUMBER OF WARRANT SHARES.

                  (a) STOCK SPLITS, ETC. The number and kind of securities
purchasable upon the exercise of this Warrant and the Exercise Price shall be
subject to adjustment from time to time upon the happening of any of the
following. In case the Company shall (i) pay a dividend in shares of Common
Stock or make a distribution in shares of Common Stock to holders of its
outstanding Common Stock, (ii) subdivide its outstanding shares of Common Stock
into a greater number of shares, (iii) combine its outstanding shares of Common
Stock into a smaller number of shares of Common Stock, or (iv) issue any shares
of its capital stock in a reclassification of the Common Stock, then the number
of Warrant Shares purchasable upon exercise of this Warrant immediately prior
thereto shall be adjusted so that the Holder shall be entitled to receive the
kind and number of Warrant Shares or other securities of the Company which it
would have owned or have been entitled to receive had such Warrant been
exercised in advance thereof. Upon each such adjustment of the kind and number
of Warrant Shares or other securities of the Company which are purchasable
hereunder, the Holder shall thereafter be entitled to purchase the number of
Warrant Shares or other securities resulting from such adjustment at an Exercise
Price per Warrant Share or other security obtained by multiplying the Exercise
Price in effect immediately prior to such adjustment by the number of Warrant
Shares purchasable pursuant hereto immediately prior to such adjustment and
dividing by the number of Warrant Shares or other securities of the Company
resulting from such adjustment. An adjustment made pursuant to this paragraph
shall become effective immediately after the effective date of such event
retroactive to the record date, if any, for such event.




                                      -6-
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                  (b) ANTI-DILUTION PROVISIONS. During the Exercise Period, the
Exercise Price and the number of Warrant Shares issuable hereunder and for which
this Warrant is then exercisable pursuant to Section 1 hereof shall be subject
to adjustment from time to time as provided in this Section 11(b). In the event
that any adjustment of the Exercise Price as required herein results in a
fraction of a cent, such Exercise Price shall be rounded up or down to the
nearest cent.

                           (i) ADJUSTMENT OF EXERCISE PRICE. If and whenever the
                  Company issues or sells, or in accordance with Section 8(b)
                  hereof is deemed to have issued or sold, any shares of Common
                  Stock for a consideration per share of less than the then the
                  Exercise Price or for no consideration (such lower price, the
                  "BASE SHARE PRICE" and such issuances collectively, a
                  "DILUTIVE ISSUANCE"), then, the Exercise Price shall be
                  reduced to equal the Base Share Price, PROVIDED, that for
                  purposes hereof, all shares of Common Stock that are issuable
                  upon conversion, exercise or exchange of Capital Share
                  Equivalents shall be deemed outstanding immediately after the
                  issuance of such Common Stock. Such adjustment shall be made
                  whenever such shares of Common Stock or Capital Share
                  Equivalents are issued.

                           (ii) EFFECT ON EXERCISE PRICE OF CERTAIN EVENTS. For
                  purposes of determining the adjusted Exercise Price under
                  Section 11(b) hereof, the following will be applicable:

                                             (A) ISSUANCE OF RIGHTS OR OPTIONS.
                               If the Company in any manner issues or grants any
                           warrants, rights or options, whether or not
                           immediately exercisable, to subscribe for or to
                           purchase Common Stock or other securities
                           exercisable, convertible into or exchangeable for
                           Common Stock ("CONVERTIBLE SECURITIES") (such
                           warrants, rights and options to purchase Common Stock
                           or Convertible Securities are hereinafter referred to
                           as "OPTIONS") and the price per share for which
                           Common Stock is issuable upon the exercise of such
                           Options is less than the Exercise Price ("BELOW BASE
                           PRICE OPTIONS"), then the maximum total number of
                           shares of Common Stock issuable upon the exercise of
                           all such Below Base Price Options (assuming full
                           exercise, conversion or exchange of Convertible
                           Securities, if applicable) will, as of the date of
                           the issuance or grant of such Below Base Price
                           Options, be deemed to be outstanding and to have been
                           issued and sold by the Company for such price per
                           share. For purposes of the preceding sentence, the
                           "price per share for which Common Stock is issuable
                           upon the exercise of such Below Base Price Options"
                           is determined by dividing (i) the total amount, if
                           any, received or receivable by the Company as
                           consideration for the issuance or granting of all
                           such Below Base Price Options, plus the minimum
                           aggregate amount of additional consideration, if any,
                           payable to the Company upon the exercise of all such




                                      -7-
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                           Below Base Price Options, plus, in the case of
                           Convertible Securities issuable upon the exercise of
                           such Below Base Price Options, the minimum aggregate
                           amount of additional consideration payable upon the
                           exercise, conversion or exchange thereof at the time
                           such Convertible Securities first become exercisable,
                           convertible or exchangeable, by (ii) the maximum
                           total number of shares of Common Stock issuable upon
                           the exercise of all such Below Base Price Options
                           (assuming full conversion of Convertible Securities,
                           if applicable). No further adjustment to the Exercise
                           Price will be made upon the actual issuance of such
                           Common Stock upon the exercise of such Below Base
                           Price Options or upon the exercise, conversion or
                           exchange of Convertible Securities issuable upon
                           exercise of such Below Base Price Options.

                                            (B) ISSUANCE OF CONVERTIBLE
                           SECURITIES. If the Company in any manner issues or
                           sells any Convertible Securities, whether or not
                           immediately convertible (other than where the same
                           are issuable upon the exercise of Options) and the
                           price per share for which Common Stock is issuable
                           upon such exercise, conversion or exchange is less
                           than the Exercise Price, then the maximum total
                           number of shares of Common Stock issuable upon the
                           exercise, conversion or exchange of all such
                           Convertible Securities will, as of the date of the
                           issuance of such Convertible Securities, be deemed to
                           be outstanding and to have been issued and sold by
                           the Company for such price per share. For the
                           purposes of the preceding sentence, the "price per
                           share for which Common Stock is issuable upon such
                           exercise, conversion or exchange" is determined by
                           dividing (i) the total amount, if any, received or
                           receivable by the Company as consideration for the
                           issuance or sale of all such Convertible Securities,
                           plus the minimum aggregate amount of additional
                           consideration, if any, payable to the Company upon
                           the exercise, conversion or exchange thereof at the
                           time such Convertible Securities first become
                           exercisable, convertible or exchangeable, by (ii) the
                           maximum total number of shares of Common Stock
                           issuable upon the exercise, conversion or exchange of
                           all such Convertible Securities. No further
                           adjustment to the Exercise Price will be made upon
                           the actual issuance of such Common Stock upon
                           exercise, conversion or exchange of such Convertible
                           Securities.

                                            (C) CHANGE IN OPTION PRICE OR
                           CONVERSION RATE. If there is a change at any time in
                           (i) the amount of additional consideration payable to
                           the Company upon the exercise of any Options; (ii)
                           the amount of additional consideration, if any,
                           payable to the Company upon the exercise, conversion
                           or exchange of any Convertible Securities; or (iii)
                           the rate at which any Convertible Securities are
                           convertible into or exchangeable for Common Stock (in
                           each such case, other than under or by reason of
                           provisions designed to protect against dilution), the
                           Exercise Price in effect at the time of such change
                           will be readjusted to the Exercise Price which would
                           have been in effect at such time had such Options or
                           Convertible Securities still outstanding provided for
                           such changed additional consideration or changed
                           conversion rate, as the case may be, at the time
                           initially granted, issued or sold.




                                      -8-
<PAGE>

                                            (D) CALCULATION OF CONSIDERATION
                           RECEIVED. If any Common Stock, Options or Convertible
                           Securities are issued, granted or sold for cash, the
                           consideration received therefor for purposes of this
                           Warrant will be the amount received by the Company
                           therefor, before deduction of reasonable commissions,
                           underwriting discounts or allowances or other
                           reasonable expenses paid or incurred by the Company
                           in connection with such issuance, grant or sale. In
                           case any Common Stock, Options or Convertible
                           Securities are issued or sold for a consideration
                           part or all of which shall be other than cash, the
                           amount of the consideration other than cash received
                           by the Company will be the fair market value of such
                           consideration, except where such consideration
                           consists of securities, in which case the amount of
                           consideration received by the Company will be the
                           fair market value (average of the closing bid and ask
                           price, if traded on any market) thereof as of the
                           date of receipt. In case any Common Stock, Options or
                           Convertible Securities are issued in connection with
                           any merger or consolidation in which the Company is
                           the surviving corporation, the amount of
                           consideration therefor will be deemed to be the fair
                           market value of such portion of the net assets and
                           business of the non-surviving corporation as is
                           attributable to such Common Stock, Options or
                           Convertible Securities, as the case may be. The fair
                           market value of any consideration other than cash or
                           securities will be determined in good faith by an
                           investment banker or other appropriate expert of
                           national reputation selected by the Company and
                           reasonably acceptable to the holder hereof, with the
                           costs of such appraisal to be borne by the Company.

                                            (E) EXCEPTIONS TO ADJUSTMENT OF
                           EXERCISE PRICE. No adjustment to the Exercise Price
                           will be made upon the grant or exercise of any
                           Convertible Securities which may hereafter be granted
                           or exercised under any employee benefit plan of the
                           Company now existing or to be implemented in the
                           future, so long as the issuance of such Convertible
                           Securities is approved by a majority of the
                           non-employee members of the Board of Directors of the
                           Company or a majority of the members of a committee
                           of non-employee directors established for such
                           purpose.

                           (iii) MINIMUM ADJUSTMENT OF EXERCISE PRICE. No
                  adjustment of the Exercise Price shall be made in an amount of
                  less than 1% of the Exercise Price in effect at the time such
                  adjustment is otherwise required to be made, but any such
                  lesser adjustment shall be carried forward and shall be made
                  at the time and together with the next subsequent adjustment
                  which, together with any adjustments so carried forward, shall
                  amount to not less than 1% of such Exercise Price.

         12. REORGANIZATION, RECLASSIFICATION, MERGER, CONSOLIDATION OR
DISPOSITION OF ASSETS. In case the Company shall reorganize its capital,
reclassify its capital stock, consolidate or merge with or into another
corporation (where the Company is not the surviving corporation or where there



                                      -9-
<PAGE>

is a change in or distribution with respect to the Common Stock of the Company),
or sell, transfer or otherwise dispose of all or substantially all its property,
assets or business to another corporation and, pursuant to the terms of such
reorganization, reclassification, merger, consolidation or disposition of
assets, shares of common stock of the successor or acquiring corporation, or any
cash, shares of stock or other securities or property of any nature whatsoever
(including warrants or other subscription or purchase rights) in addition to or
in lieu of common stock of the successor or acquiring corporation ("OTHER
PROPERTY"), are to be received by or distributed to the holders of Common Stock
of the Company, then the Holder shall have the right thereafter to receive, at
their option, (a) upon exercise of this Warrant, the number of shares of Common
Stock of the successor or acquiring corporation or of the Company, if it is the
surviving corporation, and Other Property receivable upon or as a result of such
reorganization, reclassification, merger, consolidation or disposition of assets
by a Holder of the number of shares of Common Stock for which this Warrant is
exercisable immediately prior to such event, or (b) only if the Company is not
the surviving corporation and the Closing Bid Price immediately prior to such
event is less than 110% of the Exercise Price, cash equal to the value of this
Warrant as determined in accordance with the Black-Sholes option pricing formula
which amount shall in no event exceed 150% of the product of the Exercise Price
and the number of Warrant Shares issuable hereunder. In case of any such
reorganization, reclassification, merger, consolidation or disposition of
assets, the successor or acquiring corporation (if other than the Company) shall
expressly assume the due and punctual observance and performance of each and
every covenant and condition of this Warrant to be performed and observed by the
Company and all the obligations and liabilities hereunder, subject to such
modifications as may be deemed appropriate (as determined in good faith by
resolution of the Board of Directors of the Company) in order to provide for
adjustments of Warrant Shares for which this Warrant is exercisable which shall
be as nearly equivalent as practicable to the adjustments provided for in this
Section 12. For purposes of this Section 12, "common stock of the successor or
acquiring corporation" shall include stock of such corporation of any class
which is not preferred as to dividends or assets over any other class of stock
of such corporation and which is not subject to redemption and shall also
include any evidences of indebtedness, shares of stock or other securities which
are convertible into or exchangeable for any such stock, either immediately or
upon the arrival of a specified date or the happening of a specified event and
any warrants or other rights to subscribe for or purchase any such stock. The
foregoing provisions of this Section 12 shall similarly apply to successive
reorganizations, reclassifications, mergers, consolidations or disposition of
assets.

         13. VOLUNTARY ADJUSTMENT BY THE COMPANY. The Company may at any time
during the term of this Warrant reduce the then current Exercise Price to any
amount and for any period of time deemed appropriate by the Board of Directors
of the Company.

         14. NOTICE OF ADJUSTMENT. Whenever the number of Warrant Shares or
number or kind of securities or other property purchasable upon the exercise of
this Warrant or the Exercise Price is adjusted, as herein provided, the Company
shall promptly mail by registered or certified mail, return receipt requested,
to the Holder notice of such adjustment or adjustments setting forth the number
of Warrant Shares (and other securities or property) purchasable upon the
exercise of this Warrant and the Exercise Price of such Warrant Shares (and
other securities or property) after such adjustment, setting forth a brief



                                      -10-
<PAGE>

statement of the facts requiring such adjustment and setting forth the
computation by which such adjustment was made. Such notice, in the absence of
manifest error, shall be conclusive evidence of the correctness of such
adjustment.

         15. NOTICE OF CORPORATE ACTION. If at any time:

                  (a) the Company shall take a record of the holders of its
         Common Stock for the purpose of entitling them to receive a dividend or
         other distribution, or any right to subscribe for or purchase any
         evidences of its indebtedness, any shares of stock of any class or any
         other securities or property, or to receive any other right, or

                  (b) there shall be any capital reorganization of the Company,
         any reclassification or recapitalization of the capital stock of the
         Company or any consolidation or merger of the Company with, or any
         sale, transfer or other disposition of all or substantially all the
         property, assets or business of the Company to, another corporation or,

                  (c) there shall be a voluntary or involuntary dissolution,
         liquidation or winding up of the Company;

then, in any one or more of such cases, the Company shall give to Holder (i) at
least 20 days' prior written notice of the date on which a record date shall be
selected for such dividend, distribution or right or for determining rights to
vote in respect of any such reorganization, reclassification, merger,
consolidation, sale, transfer, disposition, liquidation or winding up, and (ii)
in the case of any such reorganization, reclassification, merger, consolidation,
sale, transfer, disposition, dissolution, liquidation or winding up, at least 20
days' prior written notice of the date when the same shall take place. Such
notice in accordance with the foregoing clause also shall specify (i) the date
on which any such record is to be taken for the purpose of such dividend,
distribution or right, the date on which the holders of Common Stock shall be
entitled to any such dividend, distribution or right, and the amount and
character thereof, and (ii) the date on which any such reorganization,
reclassification, merger, consolidation, sale, transfer, disposition,
dissolution, liquidation or winding up is to take place and the time, if any
such time is to be fixed, as of which the holders of Common Stock shall be
entitled to exchange their Warrant Shares for securities or other property
deliverable upon such disposition, dissolution, liquidation or winding up. Each
such written notice shall be sufficiently given if addressed to Holder at the
last address of Holder appearing on the books of the Company and delivered in
accordance with Section 17(d).

         16. AUTHORIZED SHARES. The Company covenants that during the period the
Warrant is outstanding, it will reserve from its authorized and unissued Common
Stock a sufficient number of shares to provide for the issuance of the Warrant
Shares upon the exercise of any purchase rights under this Warrant. The Company
further covenants that its issuance of this Warrant shall constitute full
authority to its officers who are charged with the duty of executing stock
certificates to execute and issue the necessary certificates for the Warrant
Shares upon the exercise of the purchase rights under this Warrant. The Company
will take all such reasonable action as may be necessary to assure that such
Warrant Shares may be issued as provided herein without violation of any
applicable law or regulation, or of any requirements of the Principal Market
upon which the Common Stock may be listed.



                                      -11-
<PAGE>

                  The Company shall not by any action, including, without
limitation, amending its certificate of incorporation or through any
reorganization, transfer of assets, consolidation, merger, dissolution, issue or
sale of securities or any other voluntary action, avoid or seek to avoid the
observance or performance of any of the terms of this Warrant, but will at all
times in good faith assist in the carrying out of all such terms and in the
taking of all such actions as may be necessary or appropriate to protect the
rights of Holder against impairment. Without limiting the generality of the
foregoing, the Company will (a) not increase the par value of any Warrant Shares
above the amount payable therefor upon such exercise immediately prior to such
increase in par value, (b) take all such action as may be necessary or
appropriate in order that the Company may validly and legally issue fully paid
and nonassessable Warrant Shares upon the exercise of this Warrant, and (c) use
commercially reasonable efforts to obtain all such authorizations, exemptions or
consents from any public regulatory body having jurisdiction thereof as may be
necessary to enable the Company to perform its obligations under this Warrant.

                  Before taking any action which would result in an adjustment
in the number of Warrant Shares for which this Warrant is exercisable or in the
Exercise Price, the Company shall obtain all such authorizations or exemptions
thereof, or consents thereto, as may be necessary from any public regulatory
body or bodies having jurisdiction thereof.

         17. MISCELLANEOUS.

                  (a) JURISDICTION. This Warrant shall constitute a contract
         under the laws of New York, without regard to its conflict of law,
         principles or rules.

                  (b) RESTRICTIONS. The Holder acknowledges that the Warrant
         Shares acquired upon the exercise of this Warrant, if not registered,
         will have restrictions upon resale imposed by state and federal
         securities laws.

                  (c) NONWAIVER AND EXPENSES. No course of dealing or any delay
         or failure to exercise any right hereunder on the part of Holder shall
         operate as a waiver of such right or otherwise prejudice Holder's
         rights, powers or remedies, notwithstanding all rights hereunder
         terminate on the Termination Date. If the Company willfully and
         knowingly fails to comply with any provision of this Warrant, which
         results in any material damages to the Holder, the Company shall pay to
         Holder such amounts as shall be sufficient to cover any costs and
         expenses including, but not limited to, reasonable attorneys' fees,
         including those of appellate proceedings, incurred by Holder in
         collecting any amounts due pursuant hereto or in otherwise enforcing
         any of its rights, powers or remedies hereunder.

                  (d) NOTICES. Any notice, request or other document required or
         permitted to be given or delivered to the Holder by the Company shall
         be delivered in accordance with the notice provisions of the Purchase
         Agreement.

                  (e) LIMITATION OF LIABILITY. No provision hereof, in the
         absence of affirmative action by Holder to purchase Warrant Shares, and
         no enumeration herein of the rights or privileges of Holder, shall give
         rise to any




                                      -12-
<PAGE>
         liability of Holder for the purchase price of any Common Stock or as a
         stockholder of the Company, whether such liability is asserted by the
         Company or by creditors of the Company.

                  (f) REMEDIES. Holder, in addition to being entitled to
         exercise all rights granted by law, including recovery of damages, will
         be entitled to specific performance of its rights under this Warrant.
         The Company agrees that monetary damages would not be adequate
         compensation for any loss incurred by reason of a breach by it of the
         provisions of this Warrant and hereby agrees to waive the defense in
         any action for specific performance that a remedy at law would be
         adequate.

                  (g) SUCCESSORS AND ASSIGNS. Subject to applicable securities
         laws, this Warrant and the rights and obligations evidenced hereby
         shall inure to the benefit of and be binding upon the successors of the
         Company and the successors and permitted assigns of Holder. The
         provisions of this Warrant are intended to be for the benefit of all
         Holders from time to time of this Warrant and shall be enforceable by
         any such Holder or holder of Warrant Shares.

                  (h) AMENDMENT. This Warrant may be modified or amended or the
         provisions hereof waived with the written consent of the Company and
         the Holder.

                  (i) SEVERABILITY. Wherever possible, each provision of this
         Warrant shall be interpreted in such manner as to be effective and
         valid under applicable law, but if any provision of this Warrant shall
         be prohibited by or invalid under applicable law, such provision shall
         be ineffective to the extent of such prohibition or invalidity, without
         invalidating the remainder of such provisions or the remaining
         provisions of this Warrant.

                  (j) HEADINGS. The headings used in this Warrant are for the
         convenience of reference only and shall not, for any purpose, be deemed
         a part of this Warrant.

                              ********************


                                      -13-
<PAGE>




                  IN WITNESS WHEREOF, the Company has caused this Warrant to be
executed by its officer thereunto duly authorized.


Dated:  April __, 2003
                                             VIRAGEN, INC.



                                            By:
                                               -------------------------------
                                                  Name:
                                                  Title:




                                      -14-
<PAGE>





                               NOTICE OF EXERCISE

To:      Viragen, Inc.

         (1) The undersigned hereby elects to purchase ________ Warrant Shares
of Viragen, Inc. pursuant to the terms of the attached Warrant (only if
exercised in full), and tenders herewith payment of the exercise price in full,
together with all applicable transfer taxes, if any.

         (2) Payment shall take the form of (check applicable box):

                  [ ] in lawful money of the United States; or

                  [ ] the cancellation of such number of Warrant Shares as is
                  necessary, in accordance with the formula set forth in
                  subsection 3(d), to exercise this Warrant with respect to the
                  maximum number of Warrant Shares purchasable pursuant to the
                  cashless exercise procedure set forth in subsection 3(d).

         (3) Please issue a certificate or certificates representing said
Warrant Shares in the name of the undersigned or in such other name as is
specified below:

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

The Warrant Shares shall be delivered to the following:

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

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

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

         (4) ACCREDITED INVESTOR. The undersigned is an "accredited investor" as
defined in Regulation D promulgated under the Securities Act of 1933, as
amended.

                                          [PURCHASER]


                                          By:
                                              ----------------------------------
                                                Name:
                                                Title:

                                          Dated:
                                              ----------------------------------




<PAGE>




                                 ASSIGNMENT FORM

                    (To assign the foregoing warrant, execute
                   this form and supply required information.
                 Do not use this form to exercise the warrant.)



         FOR VALUE RECEIVED, the foregoing Warrant and all rights evidenced
thereby are hereby assigned to


_______________________________________________ whose address is

_______________________________________________________________.



_______________________________________________________________


                                              Dated:  ______________, _______


                           Holder's Signature: __________________________

                           Holder's Address:_____________________________

                                            _____________________________

Signature Guaranteed:  ___________________________________________


NOTE: The signature to this Assignment Form must correspond with the name as it
appears on the face of the Warrant, without alteration or enlargement or any
change whatsoever, and must be guaranteed by a bank or trust company. Officers
of corporations and those acting in a fiduciary or other representative capacity
should file proper evidence of authority to assign the foregoing Warrant.