Document:

ex4-1

Exhibit 4.1

 

THE SECURITIES REPRESENTED HEREBY HAVE NOT 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 COMPLIANCE WITH
APPLICABLE STATE SECURITIES OR BLUE SKY LAWS.

	 	 	 
	July 3, 2001
	 
	[_______] shares		
Warrant No. E-[_]

ANTEX BIOLOGICS INC.

STOCK PURCHASE WARRANT

Registered Owner: [_______]

      This Warrant is one of the Class E Warrants referred to in and issued
pursuant to the Securities Purchase Agreement among the Company, the Registered
Owner and other purchasers of Class E Warrants. This certifies that, for value
received, the Company grants the following rights to the Registered Owner, or
permitted assigns, of this Warrant:

      1. Issue. Upon tender (in accordance with Section 5) to the Company, the
Company, within three (3) Business Days of the date thereof, shall issue to the
Registered Owner, or permitted assigns, up to the number of shares specified in
Section 2 of fully paid and nonassessable shares of Common Stock that the
Registered Owner, or permitted assigns, is entitled to purchase.

      2. Number of Shares. The total number of shares of Common Stock that the
Registered Owner, or permitted assigns, of this Warrant is entitled to purchase
upon exercise of this Warrant (the “Warrant Shares”) is [_____] shares, subject
to adjustment from time to time as set forth herein. The Company shall at all
times reserve and hold available 100% of such number of shares of Common Stock
as shall be issuable (taking into account the adjustments of Section 6 hereof)
upon the exercise of this Warrant (without regard to any limitations on
exercise). The Company covenants and agrees that all shares of Common Stock
issued upon the exercise of this Warrant shall, upon issuance, be duly and
validly issued, fully paid and nonassessable, free from all taxes, liens and
charges with respect to the purchase and the issuance of the shares, and shall
not have any legend or restrictions on resale, except as required by Section
3.1(b) of the Purchase Agreement.

      3. Exercise Price. The initial per share exercise price of this Warrant,
representing the price per share at which the shares of stock issuable upon
exercise of this Warrant may be purchased, is $2.50 (the “Exercise Price”).

      4. Exercise Period. This Warrant may be exercised from the Closing Date up
to and including July 3, 2006 (the “Exercise Period”). If not exercised during
this period, this Warrant and all rights granted under this Warrant shall
expire and lapse.

      5. Tender; Issuance of Certificates.

		
	 	      a. This Warrant may be exercised, in whole or in part, by (i)
delivery to the Company of (a) the Exercise Price in cash, (b) a duly
executed Warrant Exercise Form, a copy of which is attached to this
Warrant as Exhibit A, properly executed by the Registered Owner, or
permitted assign, and (c) this Warrant, or (ii) if the resale of the
Warrant Shares by the Registered Owner is not then registered pursuant to
an effective registration statement under the Securities Act, delivery to
the Company of a written notice of an election to effect a Cashless
Exercise (as defined below) for the Warrant Shares specified in the
Warrant Exercise Form. The Warrant Shares so purchased shall be deemed
to be issued to the Registered Owner as of the close of business on the
date on which this Warrant shall have been surrendered, the completed
Warrant Exercise Form shall have been delivered and payment in full shall
have been made for such shares as set forth above. The Warrant Exercise
Form may be delivered to the Company either in person or in the manner
provided for in Section 13(c).
	 
	 	      b. Commencing ninety (90) days after the Filing Date (as defined in
the Registration Rights Agreement), if, and only if, at the time of
exercise of this Warrant, the Warrant Shares are not registered for
resale pursuant to an effective registration statement under the
Securities Act, then in addition to the exercise of all or any part of
this Warrant by payment of the Exercise Price in cash as provided above,
and in lieu of such cash payment, the Registered Owner shall have the
right to effect a cashless exercise (a “Cashless Exercise”). In the
event of a Cashless Exercise, the Registered Owner may exercise this
Warrant in whole or in part by surrendering this Warrant in exchange for
the number of shares of Common Stock equal to the product of (x) the
number of shares as to which this Warrant certificate is being exercised
multiplied by (y) a fraction, the numerator of which is the Per Share
Market Value of the Common Stock on the date this Warrant is received by
the Company less the Exercise Price then in effect and the denominator of
which is the Per Share Market Value of the Common Stock on the date the
Company receives this Warrant (in each case adjusted for fractional
shares as herein provided).
	 
	 	      c. In lieu of physical delivery of the Warrant Shares, provided the
Company’s transfer agent is participating in the Depository Trust Company
(“DTC”) Fast Automated Securities Transfer (FAST) program, upon request
of the Registered Owner and in compliance with the provisions hereof, the
Company shall use its reasonable efforts to cause its transfer agent to
electronically transmit the Warrant Shares to the Registered Owner by
crediting the account of the Registered Owner’s Prime Broker with DTC
through its Deposit Withdrawal Agent Commission system. The time period
for delivery described herein shall apply to the electronic transmittals
described herein.

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	 	      d. Certificates for the Warrant Shares so purchased, representing
the aggregate number of shares specified in the Warrant Exercise Form,
shall be delivered to the Registered Owner within three (3) Business Days
after this Warrant shall have been so exercised. The certificates so
delivered shall be in such denominations as may be requested by the
Registered Owner and shall be registered in the name of the Registered
Owner. If this Warrant shall have been exercised only in part, then,
unless this Warrant has expired, the Company shall, at its expense, at
the time of delivery of such certificates, deliver to the Registered
Owner a new warrant with the same terms hereof representing the number of
shares with respect to which this Warrant shall not then have been
exercised.

      6. Adjustment of Exercise Price.

		
	 	      a. Common Stock Dividends; Common Stock Splits; Reclassification.
If the Company, at any time while this Warrant is outstanding, (i) shall
pay or make a stock dividend on its Common Stock in shares of Common
Stock, (ii) subdivide outstanding shares of Common Stock into a larger
number of shares; (iii) effect a reverse stock split (other than a
reverse stock split as contemplated by Section 6(b) below) or (iv) issue
any shares of the Common Stock by reclassification of shares of Common
Stock, then (A) the Exercise Price thereafter shall be determined by
multiplying the Exercise Price by a fraction the numerator of which shall
be the number of shares of Common Stock outstanding before such event and
the denominator of which shall be the number of shares of Common Stock
outstanding after such event and (B) the number of Warrant Shares shall
be multiplied by a fraction, the numerator of which shall be the number
of shares of Common Stock outstanding after such event and the
denominator of which shall be the number of shares of Common Stock
(excluding treasury shares, if any) outstanding before such event. Any
adjustment made pursuant to this paragraph 6(a) shall become effective
immediately after the record date for the determination of stockholders
entitled to receive such dividend or distribution and shall become
effective immediately after the effective date in the case of a
subdivision or re-classification.
	 
	 	      b. Reverse Stock Splits. If the Company undertakes a reverse stock
split in response to a notice from AMEX, or any other National Market on
which the Common Stock is then trading, that the Common Stock is trading
below AMEX’s or such other National Market’s requirements for continued
listing, the Exercise Price shall be adjusted to the Average Price for
the ten consecutive Trading Days commencing forty-five (45) days after
the reverse stock split.
	 
	 	      c. Extraordinary Dividends and Distributions. In case the Company at
any time or from time to time after the date hereof shall declare, order,
pay or make a dividend or other distribution (including, without
limitation, any distribution of other or additional stock or Convertible
Securities or other securities or property or Options by way of dividend,
spin-off, reclassification, recapitalization or similar corporate
rearrangement) on the Common Stock other than (a) a dividend payable in
additional shares of Common Stock or (b) a dividend payable in cash and
declared out of the earned surplus of the Company as at the date hereof
as increased by any credits (other than credits resulting from a
revaluation of property) and decreased by any debits made thereto after
such date, then, and in each such case the Exercise Price in effect
immediately prior to the close of

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	 	business on the record date fixed for the determination of holders
of any class of securities entitled to receive such dividend or
distribution shall be reduced, effective as of the close of business on
such record date, to a price determined by multiplying such Exercise
Price by a fraction

		
	 	      (i) the numerator of which shall be the Per Share Market Value
in effect on such record date or, if the Common Stock trades on an
ex-dividend basis, on the date prior to the commencement of
ex-dividend trading, less the fair market value of such dividend or
distribution (as determined in good faith by the Board of Directors
of the Company) applicable to one share of Common Stock, and

		
	 	      (ii) the denominator of which shall be such Per Share Market
Value

		
	 	      d. Record Date. If the Company establishes a record date for the
purpose of entitling holders of Common Stock to receive a dividend or
other distribution payable in Common Stock, Options or Convertible
Securities, then, for the purposes of this Section 6, such record date
will be deemed to be the date of the issue or sale of the shares of
Common Stock deemed to have been issued or sold upon the declaration of
such dividend or the making of such other distribution, as the case may
be.

		
	 	      e. Adjustment to Exercise Price.

		
	 	      (i) If the Company, at any time while this Warrant is
outstanding, takes any of the actions described in this Section
6(e) (other than in a transaction covered by Section 5(b)), then,
in order to prevent dilution of the rights granted under this
Warrant, the Exercise Price will be adjusted from time to time as
provided in this Section 6(e).
	 
	 	      (A) issues or sells any Common Stock (other than Excluded
Securities);
	 
	 	      (B) grants, issues or sells any rights, options or warrants to
subscribe for or to purchase Common Stock or any stock or other
securities convertible into or exchangeable for Common Stock (such
rights, options or warrants being herein called “Options” and such
convertible or exchangeable stock or securities being herein called
“Convertible Securities”) (other than Excluded Securities); or
	 
	 	      (C) issues or sells any Convertible Securities (other than
Excluded Securities);
	 
	 	for (1) with respect to paragraph (i)(A) above, a price per share,
or (2) with respect to paragraphs (i)(B) or (i)(C) above, a price
per share for which Common Stock issuable upon the exercise of such
Options or upon conversion or exchange of such Convertible
Securities is, less than the Exercise Price in effect immediately
prior to such issuance, grant or sale, then, immediately after such
issuance, grant or sale the Exercise Price then in effect shall be
reduced to an amount equal to the consideration per share of Common
Stock received or to be received in connection with such issuance,
grant or sale (including, the

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	 	consideration, if any, to be received upon the exercise of such
Options or the conversion or exchange of such Convertible
Securities). If there is a change at any time in (x) the exercise
price provided for in any Options, (y) the additional
consideration, if any, payable upon the conversion or exchange of
any Convertible Securities or (z) the rate at which any Convertible
Securities are convertible into or exchangeable for Common Stock,
then immediately after such change in exercise price, additional
consideration or rate of conversion or exchange, the Exercise Price
in effect at the time of such change shall be further readjusted to
give effect to such changed exercise price, additional
consideration or changed conversion or exchange rate, as the case
may be.
	 
	 	      (ii) Effect on Exercise Price of Certain Events. For purposes
of determining the adjusted Exercise Price under Section 6(e)(i),
the following shall be applicable:
	 
	 	      (A) Calculation of Consideration Received. If any Common
Stock, Options or Convertible Securities are issued or sold for
cash, the consideration received therefor will be deemed to be the
amount received by the Company therefor, without deducting any
expenses paid or incurred by the Company or any commissions or
compensations paid or concessions or discounts allowed to
underwriters, dealers or others performing similar services in
connection with such issue or sale. In case any Common Stock,
Options or Convertible Securities are issued or sold for a
consideration other than cash, the amount of the consideration
other than cash received by the Company will be the fair value of
such consideration, except where such consideration consists of
securities listed or quoted on a National Market, in which case the
amount of consideration received by the Company will be the Average
Price of such security for the ten (10) consecutive Trading Days
immediately preceding the date of receipt thereof. The fair value
of any consideration other than cash or securities listed or quoted
on a National Market will be determined jointly by the Company and
the Registered Owners of a majority of the Transaction Warrants
then outstanding. If such parties are unable to reach agreement
within ten (10) days after the occurrence of an event requiring
valuation (the “Valuation Event”), the fair value of such
consideration will be determined within forty-eight (48) hours of
the tenth (10th) day following the Valuation Event by an Appraiser
selected in good faith by the Company, and agreed upon in good
faith by the Registered Owners of a majority of the Transaction
Warrants then outstanding. The determination of such Appraiser
shall be binding upon all parties absent manifest error.
	 
	 	      (B) Integrated Transactions. In case any Option is issued in
connection with the issue or sale of other securities of the
Company, together comprising one integrated transaction in which no
specific consideration is allocated to such Options by the parties
thereto the aggregate consideration of the Options shall be
determined by an Appraiser selected mutually, in good faith, by the
Registered Owners of a majority interest of the Transaction
Warrants and the Company.
	 
	 	      (C) Treasury Shares. The number of shares of Common Stock
outstanding at any given time shall not include shares owned or
held by or for the

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	 	Company’s account, if any, and the disposition of any shares
so owned or held shall be considered an issue or sale of Common
Stock by the Company.
	 
	 	      (D) Certain Events. If the Company grants any stock
appreciation rights, phantom stock rights or other rights with
equity features (excluding the issuance of any Excluded Securities)
that adversely affects the rights of any Registered Owner of the
Warrants, but is not expressly provided for by Section 6 hereof,
then the Board will make an appropriate adjustment in the Exercise
Price so as to protect the rights of the Registered Owners or
assigns; provided, however, that no such adjustment will increase
the Exercise Price.

		
	 	      Notwithstanding the foregoing, in no event, other than a reverse
stock split, shall any provision in this Section 6 cause the Exercise
Price to be greater than the Exercise Price on the date of issuance of
this Warrant.

		
	 	      f. Adjustment of Number of Shares. For the avoidance of doubt, upon
each adjustment in the Exercise Price pursuant to any provision of this
Section 6 (other than Section 6(a)) the number of shares of Common Stock
purchasable hereunder shall be adjusted, to the nearest 1/100th of a
share, to the product obtained by multiplying such number of shares
purchasable immediately prior to such adjustment in the Exercise Price by
a fraction, the numerator of which shall be the Exercise Price
immediately prior to such adjustment and the denominator of which shall
be the Exercise Price immediately thereafter.
	 
	 	      g. Rounding. All calculations under this Section 6 shall be made to
the nearest cent or the nearest 1/100th of a share, as the case may be.
	 
	 	      h. Mandatory Redemption. In case (a) the Company refuses to honor a
duly executed Warrant Exercise Form delivered pursuant to Section 5
hereof, (b) the Company fails to deliver to the Registered Owner such
certificate or certificates pursuant to Section 5 on or prior to the
fifteenth (15th) Trading Day after the Exercise Date, (c)(i) a
Registration Statement for the Warrant Shares shall not have been
declared effective by the Securities and Exchange Commission on or prior
to the 150th day after the closing date of the Additional Investment or
December 28, 2001, whichever is earlier or, (ii) after its initial
effectiveness and prior to the expiration of the Company’s obligation to
keep the Registration Statement effective as required under the
Registration Rights Agreement, such Registration Statement lapses in
effect or sales of all of the Warrant Shares otherwise cannot be made
thereunder (other than by reason of any actions taken by a Registered
Owner) for more than twenty (20) consecutive days or forty (40) days in
any twelve (12) month period (other than by reason of Section 3(q) of the
Registration Rights Agreement), (d) the Common Stock shall be delisted
from AMEX or shall be suspended from trading on AMEX without resuming
trading and/or being relisted thereon or having such suspension lifted,
as the case may be, within ten (10) Business Days, (e) the Company makes
an Unauthorized Transfer without advance written consent of the
Registered Owner or (f) the Company consummates a Change of Control
Transaction (each a “Redemption Event”), the Registered Owner shall have
the option to require the Company to redeem, from funds legally available
therefor at the time of such redemption, in cash (the “Redemption Right”)
the Registered Owner’s shares of Common Stock

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	 	immediately theretofore acquirable and receivable upon the exercise
of this Warrant at a price per share equal to the product of (i) the
Average Price immediately preceding the effective date, the date of the
closing, or date of consummation, as the case may be, of the Redemption
Event triggering such Redemption Right minus the Exercise Price of this
Warrant and (ii) the number of shares of Common Stock issuable upon
exercise of this Warrant immediately prior to such Redemption Event (the
“Mandatory Redemption Price”). The Company shall pay the applicable
Mandatory Redemption Price to the Registered Owner of the Warrants being
redeemed in cash on the Redemption Date; except that in the event of an
occurrence of a Redemption Event specified in (d) above, the Company
shall issue to the Registered Owner on the Redemption Date a promissory
note in the principal amount equal to the Redemption Price, bearing
interest at the rate of 1.0% per month and payable in full 90 days after
the Redemption Date. If the Company shall fail to pay the applicable
Mandatory Redemption Price to such Registered Owner on the Redemption
Date, the sole monetary remedy that such Registered Owner will have is
that such unpaid amount shall bear interest at the rate of 1.0% per month
until paid in full.

		
	 	      i. Optional Redemption.

		
	 	      (i) Optional Redemption. This Warrant is redeemable in whole
or in part at the option of the Company at any time, subject to the
conditions set forth in this Section 6(i)(i) in either of the
following circumstances:
	 
	 	      (A) Commencing on the first Business Day immediately after
nine (9) months following the Effectiveness Date (as defined in the
Registration Rights Agreement), provided that the closing price of
the Company’s Common Stock is greater than $5.00 for twenty (20)
consecutive Trading Days.
	 
	 	      (B) After the Original Issue Date, if the Warrants outstanding
represent less than 5% of the Warrant Shares to be issued upon
exercise of the Warrants issued on the Original Issue Date remain
unexercised, excluding from such calculation any Warrants held by
Affiliate of the Company as of such date (other than any Registered
Owner or transferees or successors or permitted assigns thereof if
such Registered Owner is deemed to be an Affiliate solely by reason
of its holding of Preferred Stock and Transaction Warrants)
	 
	 	      (ii) Redemption Notice. Subject to the conditions set forth
in Section 6(i)(i), so long as any Registration Statement required
to be filed and be effective pursuant to the Registration Rights
Agreement is then in effect and has been in effect and sales of all
of the Registrable Securities could have been made thereunder for
at least twenty (20) days prior to the Redemption Notice Date (as
defined below), upon twenty (20) Trading Days’ prior written notice
to the Registered Owner (a “Redemption Notice”), the Warrant may be
redeemed by the Company, in whole or in part, at a redemption price
equal to $.10 per Warrant (the “Optional Redemption Price”).
	 
	 	      (iii) Mechanics of Redemption. The Company shall exercise its
right to redeem by delivering its Redemption Notice by facsimile
and overnight courier to

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	 	each Registered Owner (such date that the Redemption Notice is
given on the “Redemption Notice Date”). Such Redemption Notice
shall indicate (A) the Optional Redemption Price, (B) each
Registered Owner’s pro rata allocation of the Warrants to be
redeemed, and (C) the date that the Company shall effect the
redemption (the “Redemption Date”). The Redemption Date shall be
not less than twenty (20) Trading Days and not more than sixty (60)
calendar days after the Redemption Notice Date. Notwithstanding
anything in this Section 6(i), the Company shall effect the
exercise of any Warrant pursuant to Section 5 if the Warrant
Exercise Form is received by the Company, together with the
Exercise Price in cash and the Warrant, before the Redemption Date.
	 
	 	      (iv) Payment of Optional Redemption Price. The Company shall
pay the applicable Optional Redemption Price to the Registered
Owner of the Warrants being redeemed in cash on the Redemption Date
(or, if later, the Business Day following the Business Day upon
which the Company receives the Warrant). If the Company shall fail
to pay the applicable Optional Redemption Price to such Registered
Owner on the Redemption Date, the sole monetary remedy such
Registered Owner will have is that such unpaid amount shall bear
interest from Redemption Date (or, if later, the Business Day
following the Business Day upon which the Company receives the
Warrant) at the rate of 1.0% per month until paid in full.

      7. AMEX Limitation. If on any date (the “Threshold Date”) (a) the Common
Stock is listed for trading on AMEX (or any other National Market), (b) the
Exercise Price then in effect is such that the aggregate number of shares of
Common Stock that would then be issuable upon exercise in full of the then
outstanding Class E Warrants if all such Class E Warrants were exercised on
such Threshold Date (without regard to any limitations on exercise) combined
with all other issuances of Common Stock, which under the requirements of AMEX
(or any other National Market) are required to be aggregated with such issuance
(including, without limitation, the shares of Common Stock issuable pursuant to
the Certificate of Designation and the shares of Common Stock issuable upon the
exercise of the Class F Warrants) for determining the need for stockholder
approval (“Stockholder Approval”) for the listing of the shares to be issued on
AMEX (or any other National Market), would equal or exceed 19.9% of the number
of shares of the Common Stock outstanding immediately prior to the Original
Issuance Date (the “Issuable Maximum”), and (c) the issuance of shares of
Common Stock in excess of the Issuable Maximum shall not have been approved by
the stockholders of the Company in accordance with the applicable rules and
regulations of AMEX (or any other National Market), then with respect to the
aggregate number of shares of Common Stock issuable upon the exercise of the
Class E Warrants then held by the Registered Owners for which an exercise in
accordance with the Exercise Price would result in an issuance of shares of
Common Stock in excess of the Issuable Maximum (the “Excess Amount”), the
Company shall use its reasonable efforts to obtain the Stockholder Approval
applicable to such issuance as soon as is possible, but in any event not later
than the 90th day after the Threshold Date unless the Company has previously
used its commercially reasonable efforts to, but has failed to, obtain such
approval; provided that such Stockholder Approval will satisfy the applicable
rules and regulations of the AMEX (or other National Market). If such
Stockholder Approval is not obtained the Company shall pay to such Registered
Owner an amount in cash equal to (1) the Average Price on the Threshold Date
minus

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 the Exercise Price multiplied by (2) the number of shares of Common Stock
issuable upon the exercise of this Warrant equal to the Excess Amount.

      Notwithstanding any provision of this Warrant to the contrary, unless and
until Stockholder Approval is obtained, in no event shall the Company be
required to issue any shares of Common Stock upon the exercise of this Warrant
if, after giving effect to such exercise, the aggregate number of shares of
Common Stock previously issued upon the exercise of Class E Warrants and Class
F Warrants and issued by the Company pursuant to the Certificate of
Designation, combined with all other issuances of Common Stock, which under the
requirements of AMEX (or any other National Market) are required to be
aggregated with such issuances for determining the need for Stockholder
Approval, would equal or exceed the Maximum Amount.

      8. Restriction on Exercise by the Registered Owner. Notwithstanding
anything herein to the contrary, in no event shall the Registered Owner have
the right or be required to exercise this Warrant if as a result of such
exercise the aggregate number of shares of Common Stock beneficially owned by
such Registered Owner and its Affiliates would exceed 4.99% of the outstanding
shares of the Common Stock following such exercise. For purposes of this
Section 8, beneficial ownership shall be calculated in accordance with Section
13(d) of the Exchange Act. The provisions of this Section 8 may be waived by a
Registered Owner as to itself (and solely as to itself) upon not less than
sixty-five (65) days, prior written notice to the Company, and the provisions
of this Section 8 shall continue to apply until such 65th day (or later, if
stated in the notice of waiver). In no event shall the Company have any
liability under the terms of this Warrant or otherwise to the Registered Owner
or any permitted assign in the event that such Registered Owner or permitted
assign, upon the exercise of all or a portion of this Warrant, beneficially
owns more than 4.99% of the outstanding shares of Common Stock following such
exercise.

      9. Officer’s Certificate. Whenever the number of shares purchasable upon
exercise shall be adjusted as required by the provisions of Section 6, the
Company shall forthwith file in the custody of its secretary or an assistant
secretary at its principal office and with its stock transfer agent, if any, an
officer’s certificate showing the adjusted Exercise Price, number of shares or
other securities determined as herein provided, setting forth in reasonable
detail the facts requiring such adjustment and the manner of computing such
adjustment. Each such officer’s certificate shall be signed by the chairman,
president or chief financial officer of the Company and by the secretary or any
assistant secretary of the Company. Each such officer’s certificate shall be
made available at all reasonable times for inspection by any Registered Owner
of the Warrants and the Company shall, forthwith after each such adjustment,
deliver a copy of such certificate to the each of the Registered Owners.

      10. Definitions. Capitalized terms used herein and not otherwise defined
herein shall have the meanings given to such terms in the Purchase Agreement.
As used in this Warrant, the following terms have the following meanings:

      “Additional Investment” has the meaning set forth in the Purchase
Agreement.

      “Affiliate” means, with respect to any Person, another Person that,
directly or indirectly, (i) controls that Person, (ii) is controlled by that
Person or (iii) is under common control with that Person. “Control” for
purposes of this Warrant, when used with respect to any Person, means the

9

possession, direct or indirect, of the power to cause the direction of the
management and policies of such Person, whether through the ownership of voting
securities, by contract or otherwise; and the terms “affiliated”, “controlling”
and “controlled” have meanings correlative to the foregoing.

      “AMEX” means American Stock Exchange.

      “Appraiser” means a nationally recognized or major regional investment
banking firm or firm of independent certified public accountants of recognized
standing.

      “Approved Stock Plan” means any contract, plan or agreement which has been
approved by the Board or a committee thereof, pursuant to which the Company’s
securities may be issued to any of the Company’s employees, officers or
directors.

      “Average Price” on any date means (x) the sum of the Per Share Market
Value for the ten (10) Trading Days immediately preceding such date minus (y)
the highest and lowest Per Share Market Value during the ten (10) Trading Days
immediately preceding such date, divided by (z) eight (8), or a similar
calculation if another figure for the number of Trading Days is set forth for
clause (x) of this definition.

      “Business Day” means any day except Saturday, Sunday and any day which
shall be a legal holiday in the State of New York or a day on which banking
institutions in the State of New York generally are authorized or required by
law or other government action to close.

      “Cashless Exercise” has the meaning assigned to it in Section 5(b) hereof.

      “Certificate of Designation” has the meaning set forth in the Purchase
Agreement.

      “Change of Control Transaction” means the consummation of any of (i) any
acquisition or series of related acquisitions by any Person or “group” (as
described in Section 13(d)(3) of the Exchange Act) of in excess of fifty
percent (50%) of the voting power of the Company, (ii) the merger or
consolidation of the Company with or into another Person (regardless of whether
such transaction is with one or more Affiliates of the Company) or (iii) a
sale, conveyance, lease, transfer or disposition of all or substantially all of
the Company’s assets in one or a series of related transactions (regardless of
whether such transaction is with one or more Affiliates of the Company).

      “Class E Warrants” means the Class E Warrants of the Company issued
pursuant to the Purchase Agreement and in connection with the Additional
Investment.

      “Class F Warrants” means the Class F Warrants of the Company issued
pursuant to the Purchase Agreement and in connection with the Additional
Investment.

      “Closing” has the meaning set forth in Section 1.2 of the Purchase
Agreement.

      “Closing Date” has the meaning set forth in Section 1.2 of the Purchase
Agreement.

      “Common Stock” means the shares of the Company’s Common Stock, par value
$0.01 per share.

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      “Company” means Antex Biologics Inc., a Delaware corporation.

      “Convertible Securities” has the meaning assigned to it in Section
6(e)(i)(B) hereof.

      “Distribution Date” has the meaning assigned to it in Section 21 hereof.

      “DTC” has the meaning assigned to it in Section 5(c) hereof.

      “Excess Amount” has the meaning assigned to it in Section 7 hereof.

      “Exchange Act” means the Securities Exchange Act of 1934, as amended.

      “Excluded Securities” means (i) shares of Common Stock, Options or
Convertible Securities issued or issuable pursuant to the terms of this Warrant
and the Purchase Agreement, (ii) shares of Common Stock, Options or
Convertible Securities issued by the Company in connection with an Approved
Stock Plan, (iii) shares of Common Stock, Options or Convertible Securities
issuable upon the exercise of any options, rights or warrants outstanding as of
July 3, 2001 and set forth on Schedule 2.1(c) of the Purchase Agreement, (iv)
shares of Common Stock, Options or Convertible Securities issued or issuable in
connection with a bank credit agreement or a real estate or equipment lease or
(iv) shares of Common Stock, Options or Convertible Securities issued or deemed
to be issued by the Company in connection with acquisition, merger, partnering,
licensing or strategic transactions.

      “Exercise Period” has the meaning assigned to it the Section 4 hereof.

      “Exercise Price” has the meaning assigned to it in Section 3 hereof

      “Issuable Maximum” has the meaning assigned to it in Section 7 hereof.

      “Mandatory Redemption Price” has the meaning assigned to it in Section
6(h) hereof.

      “National Market” means the NASDAQ National Market, the NASDAQ SmallCap
Market, the New York Stock Exchange and the AMEX.

      “Optional Redemption Price” has the meaning assigned to it in Section 6(i)
hereof.

      “Options” has the meaning assigned to it in Section 6(e)(i)(B) hereof.

      “Original Issue Date” shall mean the Closing Date.

      “OTCBB” means the Over-the-Counter Bulletin Board of the National
Association of Securities Dealers, Inc.

      “Per Share Market Value” means on any particular date (a) the closing bid
price per share of the Common Stock on such date on (i) the National Market on
which the Common Stock is then listed or quoted, or, if there is no such price
on such date, then the closing bid price on such exchange or quotation system
on the date nearest preceding such date, or (ii) the OTCBB, as reported by the
National Quotation Bureau Incorporated (or similar organization or agency
succeeding to its function of reporting prices), or (b) if the Common Stock is
not then listed or quoted on any National Market or the OTCBB, the fair market
value of a share of Common

11

Stock as determined by an Appraiser selected in good faith by the
Registered Owners of a majority in interest of the Warrants; provided,
however, that the Company, after receipt of the determination by such
Appraiser, shall have the right to select, in good faith, an additional
Appraiser, in which case the fair market value shall be equal to the average of
the determinations by each such Appraiser; and provided, further that all
determinations of the Per Share Market Value shall be appropriately adjusted
for any stock dividends, stock splits or other similar transactions during the
period for calculation of the Average Price.

      “Person” means an individual or a corporation, partnership, trust,
incorporated or unincorporated association, joint venture, limited liability
company, joint stock company, government (or an agency or political subdivision
thereof) or other entity of any kind.

      “Purchase Agreement” means that certain Securities Purchase Agreement,
dated July 3, 2001, among the Company and the Purchasers.

      “Purchaser” has the meaning set forth in the Purchase Agreement.

      “Redemption Date” has the meaning assigned to it in Section 6(i) hereof.

      “Redemption Event” has the meaning assigned to it in Section 6(h) hereof.

      “Redemption Notice” has the meaning assigned to it in Section 6(i) hereof.

      “Redemption Notice Date” has the meaning assigned to it in Section 6(i)
hereof.

      “Redemption Right” has the meaning assigned to it in Section 6(h) hereof.

      “Registered Owner” means the person identified on the face of this Warrant
as the registered owner hereof or such other person as shown on the records of
the Company as being the registered owner of this Warrant or their assigns.

      “Registration Rights Agreement” means that certain Registration Rights
Agreement, dated July 3, 2001, among the Company and the Purchasers.

      “Registration Statement” has the meaning set forth in the Registration
Rights Agreement.

      “Rights” has the meaning assigned to it in Section 21 hereof.

      “Rights Plan” has the meaning assigned to it in Section 21 hereof.

      “Securities Act” means the Securities Act of 1933, as amended.

      “Stockholder Approval” has the meaning assigned to it in Section 7 hereof.

      “Threshold Date” has the meaning assigned to it in Section 7 hereof.

      “Trading Day(s)” means any day on which the OTCBB or any National Market
on which the Common Stock is then listed or quoted is open for trading.

12

      “Transaction Warrant(s)” means the Class E Warrants and Class F Warrants
issued at the Closing.

      “Unauthorized Transfer” means the transfer of any material assets or an
interest in any material assets to an Affiliate or other Person who will be an
Affiliate after the transfer (other than an Affiliate that is wholly-owned by
the transferor) in connection with a sale of securities by any such Affiliate
to a Person other than a strategic investor.

      “Valuation Event” has the meaning assigned to it in Section 6(e)(ii)(A)
hereof.

      “Warrant Shares” has the meaning assigned to it in Section 2 hereof.

      11. Registration Rights. The Company will undertake the registration of
the Common Stock into which the Warrants are exercisable at such times and upon
such terms pursuant to the provisions of the Registration Rights Agreement.

      12. Reservation of Shares; Listing. The Company covenants that it will at
all times reserve and keep available out of its authorized shares of Common
Stock, free from preemptive rights, solely for the purpose of issue upon
exercise of this Warrant as herein provided, such number of shares of the
Common Stock as shall then be issuable upon the exercise of this Warrant. The
Company shall promptly secure the listing of the shares of Common Stock
issuable upon exercise of this Warrant upon each national securities exchange
or automated quotation system, if any, upon which shares of Common Stock are
then listed (subject to official notice of issuance upon exercise of this
Warrant) and shall maintain, so long as any other shares of Common Stock shall
be so listed, such listing of all shares of Common Stock from time to time
issuable upon the exercise of this Warrant; and the Company shall so list on
each national securities exchange or automated quotation system, as the case
may be, and shall maintain such listing of, any other shares of capital stock
of the Company issuable upon the exercise of this Warrant if and so long as any
shares of the same class shall be listed on such national securities exchange
or automated quotation system.

      13. Notices. Any notices, consents, waivers or other communications
required or permitted to be given under the terms of this Warrant shall be in
writing and shall be deemed to have been delivered (a) upon receipt, when
delivered personally; (b) upon receipt, when sent by facsimile, provided
confirmation of transmission is mechanically or electronically generated and
kept on file by the sending party (if received by 5:30 p.m. EST where such
notice is received) or the first business day following such delivery (if
received on or after 5:30 p.m. EST where such notice is received); or (c) two
business days after deposit with a nationally recognized overnight courier, in
each case properly addressed to the party to receive the same. The addresses
and facsimile numbers for such communications shall be:

13

	 	If to the Company:

	 	        Antex Biologics Inc.

        300 Professional Drive

        Gaithersburg, Maryland 20879

        Telephone: (301) 590-0129

        Facsimile: (301) 590-1252

        Attention: V.M. Esposito, Chairman and CEO

	 	With a copy to:

	 	        Covington & Burling

        1201 Pennsylvania Avenue, N.W.

        Washington, D.C. 20004

        Telephone: (202) 662-6000

        Facsimile: (202) 662-6291

        Attention: D. Michael Lefever, Esq.

	 	If to the Transfer Agent:

	 	        American Stock Transfer and Trust Company

        40 Wall Street

        New York, New York 10005

        Telephone: (718) 921-8293

        Facsimile: (718) 921-8334

        Attention: Isaac Freilich

	 	If to Registered Owner to:

	 	        [Name]

        [Address]

        [City/State/Zip Code]

        Telephone: [______]

        Facsimile: [______]

        Attention: [______]

	 	With a copy to:

	 	        [Name]

        [Address]

        [City/State/Zip Code]

        Telephone: [______]

        Facsimile: [______]

        Attention: [______]

Each party shall provide written notice to the other party of any change in
address or facsimile number in accordance with the provisions hereof.

14

      14. Compliance With Governmental Requirements. The Company covenants that
if any shares of Common Stock required to be reserved for purposes of the
exercise of this Warrant require registration with or approval of any
governmental authority under any federal or state law, or any national
securities exchange or automated quotation system, before such shares may be
issued upon exercise, the Company will use its reasonable efforts to cause such
shares to be duly registered or approved, as the case may be.

      15. Fractional Shares. Upon any exercise hereunder, the Company shall not
be required to issue stock certificates representing fractions of shares of the
Common Stock, but may if otherwise permitted make a cash payment in respect of
any final fraction of a share based on the Per Share Market Value at such time.
If the Company elects not, or is unable, to make such a cash payment, the
Registered Owner shall be entitled to receive, in lieu of the final fraction of
a share in lieu of a final fractional share of one-half or more, one whole
share of Common Stock, or, if less than one-half, nothing.

      16. Payment of Tax Upon Issue of Transfer. The issuance of certificates
for shares of the Common Stock upon exercise of this Warrant shall be made
without charge to the Registered Owner for any documentary, stamp or similar
taxes that may be payable in respect of the issue or delivery of such
certificate, provided that the Company shall not be required to pay any tax
that may be payable in respect of any transfer involving the issuance and
delivery of any such certificate upon exercise in a name other than that of the
Registered Owner 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 such tax or shall have
established to the satisfaction of the Company that such tax has been paid or
is not payable.

      17. Warrants Owned by Company Deemed Not Outstanding. In determining
whether the holders of the outstanding Warrants have concurred in any
direction, consent or waiver under this Warrant, Warrants which are owned by
the Company or any other obligor on the Warrants or by any Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with the Company or any other obligor on the Warrants shall be
disregarded and deemed not to be outstanding for the purpose of any such
determination; provided that any Warrants owned by the Purchasers (as defined
in the Purchase Agreement) shall be deemed outstanding for purposes of making
such a determination. The Registered Owner may pledge the Warrants with the
prior consent of the Company, which consent will not be unreasonably withheld.
Warrants so owned which have been pledged in good faith may be regarded as
outstanding if the pledgee establishes to the satisfaction of the Company the
pledgee’s right so to act with respect to such Warrants and that the pledgee is
not the Company or any other obligor on the Warrants or any Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with the Company or any other obligor on the Warrants.

      18. Titles/Headings. The titles and headings herein are for convenience
only, do not constitute a part of this Warrant and shall not be deemed to limit
or affect any of the provisions hereof.

      19. No Rights as Stockholder. This Warrant shall not entitle the
Registered Owner to any rights as a stockholder of the Company, including
without limitation, the right to vote, to receive dividends and other
distributions, or to receive notice of, or to attend, meetings of

15

stockholders or any other proceedings of the Company, unless and to the
extent exercised for shares of Common Stock in accordance with the terms
hereof.

      20. Certain Actions Prohibited. The Company will not, by amendment of its
charter 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 to be observed or performed by it hereunder, but will at all times in
good faith assist in the carrying out of all the provisions of this Warrant and
in the taking of all such action as may reasonably be requested by the holder
of this Warrant in order to protect the exercise privilege of the holder of
this Warrant against dilution or other impairment, consistent with the tenor
and purpose of this Warrant. Without limiting the generality of the foregoing,
the Company (i) will not increase the par value of any shares of Common Stock
receivable upon the exercise of this Warrant above the Exercise Price then in
effect, and (ii) will take all such actions as may be necessary or appropriate
in order that the Company may validly and legally issue fully paid and
nonassessable shares of Common Stock upon the exercise of this Warrant.

      21. Shareholder Rights Plan. In the event that the Company shall
distribute “poison pill” rights (“Rights”) pursuant to a “poison pill”
shareholder rights plan (a “Rights Plan”), the Company shall, in lieu of making
any adjustment pursuant to Section 6, make proper provision so that each
Registered Owner who exercises this Warrant after the record date for such
distribution and prior to the expiration or redemption of the Rights Plan shall
be entitled to receive upon such exercise, in addition to the shares of Common
Stock issuable upon such exercise, a number of Rights to be determined as
follows: (i) if such exercise occurs on or prior to the date for the
distribution to the holders of Rights of separate certificates evidencing such
Rights (the “Distribution Date”), the same number of Rights to which a holder
of a number of shares of Common Stock equal to the number of shares of Common
Stock issuable upon such exercise at the time of such exercise would be
entitled in accordance with the terms of the Rights Plan; and (ii) if such
exercise occurs after the Distribution Date, the same number of Rights to which
a holder of the number of shares of Common Stock into which this Warrant was
exercisable immediately prior to the Distribution Date would have been entitled
on the Distribution Date in accordance with the terms of the Rights Plan to the
extent permitted by the terms and conditions of the Rights Plan.

      22. Successors and Assigns. This Warrant shall be binding upon and inure
to the benefit of the Registered Owner and its permitted assigns, and shall be
binding upon any Person succeeding to the Company by merger or acquisition of
all or substantially all of the assets of the Company. The Company may not
assign this Warrant or any rights or obligations hereunder without the prior
written consent of the Registered Owner. The Registered Owner may assign this
Warrant without the prior written consent of the Company, subject to compliance
with the federal securities laws and applicable state securities laws.

      23. Governing Law. This Warrant shall be governed by and construed and
enforced in accordance with the internal laws of the State of New York without
regard to the principles of conflicts of law thereof. Each party hereby
irrevocably submits to the nonexclusive jurisdiction of the state and federal
courts sitting in the City of New York, Borough of Manhattan, for the
adjudication of any dispute hereunder or in connection herewith or with any
transaction contemplated hereby or discussed herein, and hereby irrevocably
waives, and agrees not to assert in any suit, action or proceeding, any claim
that it is not personally subject to the jurisdiction of

16

any such court, or that such suit, action or proceeding is improper. Each
party hereby irrevocably waives personal service of process and consents to
process being served in any such suit, action or proceeding by mailing a copy
thereof to such party at the address for such notices to it under this Warrant
and agrees that such service shall constitute good and sufficient service of
process and notice thereof. Nothing contained herein shall be deemed to limit
in any way any right to serve process in any manner permitted by law. EACH
PARTY HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE, AND AGREES NOT TO
REQUEST, A JURY TRIAL FOR THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN
CONNECTION HEREWITH OR WITH ANY TRANSACTION CONTEMPLATED HEREBY OR DISCUSSED
HEREIN.

      IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its duly authorized officer as of the date first set forth above.

	 	ANTEX BIOLOGICS INC.

	 	By:_____________________________

Name:__________________________

Title:____________________________

 

 

17

EXHIBIT A

Warrant Exercise Form

TO:  ANTEX BIOLOGICS INC.

      The undersigned hereby: (1) irrevocably elects to purchase _______ shares
of Common Stock of Antex Biologics Inc., a Delaware corporation (“Antex”),
pursuant to the exercise of Warrant No. ___ heretofore issued to
___________________ on ____________, 200__; (2) encloses a cash payment of
$__________ for these shares at a price of $____ per share (reflecting any
adjustments made pursuant to the provisions of the Warrant); and (3) requests
that a certificate for the shares be issued in the name of the undersigned and
delivered to the undersigned at the address specified below; or

      The undersigned hereby: (1) irrevocably elects to exercise Warrant(s) to
purchase _____ shares of Common Stock of Antex Biologics Inc., pursuant to
Warrant No. _____ heretofore issued to _____ on _____, 2001; (2) authorizes
Antex to withhold from the shares of Common Stock otherwise deliverable
pursuant to this Exercise Notice shares of Common Stock having a fair market
value (calculated in accordance with the terms of the Warrant) equal to the
number of shares being purchased multiplied by the exercise price of $____ per
share (reflecting any adjustments made pursuant to the provisions of the
Warrant); and (3) requests that a certificate for the shares be issued in the
name of the undersigned and delivered to the undersigned at the address
specified below.

	 	 	 
	Date:		
______________________________
	 
	Investor Name:		
______________________________
	 
	Taxpayer Identification		
______________________________
	 
	Number:		
______________________________
	 
	By:		
______________________________
	 
	Printed Name:		
______________________________
	 
	Title:		
______________________________
	 
	Address:		
______________________________
	 
			
______________________________
	 
			
______________________________
	 
	
Note: The above signature should correspond exactly
with the name on the face of this Warrant Certificate
or with the name of assignee appearing in assignment
form below.

18

AND, if said number of shares shall not be all the shares purchasable under the
within Warrant, a new Warrant Certificate is to be issued in the name of said
undersigned for the balance remaining of the shares purchasable thereunder less
any fraction of a share paid in cash and delivered to the address stated above.

 

 

19ex4-2

Exhibit 4.2

      THE SECURITIES REPRESENTED HEREBY HAVE NOT 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 COMPLIANCE WITH
APPLICABLE STATE SECURITIES OR BLUE SKY LAWS.

	 	 	 	 	 
	July 3, 2001
	
	
	
	

	[_______] shares				Warrant No. F-[_]

ANTEX BIOLOGICS INC.

STOCK PURCHASE WARRANT

Registered Owner: [___________]

      This Warrant is one of the Class F Warrants referred to in and issued
pursuant to the Securities Purchase Agreement among the Company, the Registered
Owner and other purchasers of Class F Warrants. This certifies that, for value
received, the Company grants the following rights to the Registered Owner, or
permitted assigns, of this Warrant::

      1. Issue. Upon tender (in accordance with Section 5) to the Company, the
Company, within three (3) Business Days of the date thereof, shall issue to the
Registered Owner, or permitted assigns, up to the number of shares specified in
Section 2 of fully paid and nonassessable shares of Common Stock that the
Registered Owner, or permitted assigns, is entitled to purchase.

      2. Number of Shares. The total number of shares of Common Stock that the
Registered Owner, or permitted assigns, of this Warrant is entitled to purchase
upon exercise of this Warrant (the “Warrant Shares”) is [______] shares,
subject to adjustment from time to time as set forth herein. The Company shall
at all times reserve and hold available 100% of such number of shares of Common
Stock as shall be issuable (taking into account the adjustments of Section 6
hereof) upon the exercise of this Warrant (without regard to any limitations on
exercise). The Company covenants and agrees that all shares of Common Stock
issued upon the exercise of this Warrant shall, upon issuance, be duly and
validly issued, fully paid and nonassessable, free from all taxes, liens and
charges with respect to the purchase and the issuance of the shares, and shall
not have any legend or restrictions on resale, except as required by Section
3.1(b) of the Purchase Agreement.

 

      3. Exercise Price. The initial per share exercise price of this Warrant,
representing the price per share at which the shares of stock issuable upon
exercise of this Warrant may be purchased, is $3.00 (the “Exercise Price”).

      4. Exercise Period. This Warrant may be exercised from the Closing Date up
to and including July 3, 2006 (the “Exercise Period”). If not exercised during
this period, this Warrant and all rights granted under this Warrant shall
expire and lapse.

      5. Tender; Issuance of Certificates.

		
	 	      a. This Warrant may be exercised, in whole or in part, by (i)
delivery to the Company of (a) the Exercise Price in cash, (b) a duly
executed Warrant Exercise Form, a copy of which is attached to this
Warrant as Exhibit A, properly executed by the Registered Owner, or
permitted assign, and (c) this Warrant, or (ii) if the resale of the
Warrant Shares by the Registered Owner is not then registered pursuant to
an effective registration statement under the Securities Act, delivery to
the Company of a written notice of an election to effect a Cashless
Exercise (as defined below) for the Warrant Shares specified in the
Warrant Exercise Form. The Warrant Shares so purchased shall be deemed
to be issued to the Registered Owner as of the close of business on the
date on which this Warrant shall have been surrendered, the completed
Warrant Exercise Form shall have been delivered and payment in full shall
have been made for such shares as set forth above. The Warrant Exercise
Form may be delivered to the Company either in person or in the manner
provided for in Section 13(c).

		
	 	      b. Commencing ninety (90) days after the Filing Date (as defined in
the Registration Rights Agreement), if, and only if, at the time of
exercise of this Warrant, the Warrant Shares are not registered for
resale pursuant to an effective registration statement under the
Securities Act, then in addition to the exercise of all or any part of
this Warrant by payment of the Exercise Price in cash as provided above,
and in lieu of such cash payment, the Registered Owner shall have the
right to effect a cashless exercise (a “Cashless Exercise”). In the
event of a Cashless Exercise, the Registered Owner may exercise this
Warrant in whole or in part by surrendering this Warrant in exchange for
the number of shares of Common Stock equal to the product of (x) the
number of shares as to which this Warrant certificate is being exercised
multiplied by (y) a fraction, the numerator of which is the Per Share
Market Value of the Common Stock on the date this Warrant is received by
the Company less the Exercise Price then in effect and the denominator of
which is the Per Share Market Value of the Common Stock on the date the
Company receives this Warrant (in each case adjusted for fractional
shares as herein provided).

		
	 	      c. In lieu of physical delivery of the Warrant Shares, provided the
Company’s transfer agent is participating in the Depository Trust Company
(“DTC”) Fast Automated Securities Transfer (FAST) program, upon request
of the Registered Owner and in compliance with the provisions hereof, the
Company shall use its reasonable efforts to cause its transfer agent to
electronically transmit the Warrant Shares to the Registered Owner by
crediting the account of the Registered Owner’s Prime Broker with DTC
through its Deposit Withdrawal Agent Commission system. The time period
for delivery described herein shall apply to the electronic transmittals
described herein.

2

		
	 	      d. Certificates for the Warrant Shares so purchased, representing
the aggregate number of shares specified in the Warrant Exercise Form,
shall be delivered to the Registered Owner within three (3) Business Days
after this Warrant shall have been so exercised. The certificates so
delivered shall be in such denominations as may be requested by the
Registered Owner and shall be registered in the name of the Registered
Owner. If this Warrant shall have been exercised only in part, then,
unless this Warrant has expired, the Company shall, at its expense, at
the time of delivery of such certificates, deliver to the Registered
Owner a new warrant with the same terms hereof representing the number of
shares with respect to which this Warrant shall not then have been
exercised.

      6. Adjustment of Exercise Price.

		
	 	      a. Common Stock Dividends; Common Stock Splits; Reclassification.
If the Company, at any time while this Warrant is outstanding, (i) shall
pay or make a stock dividend on its Common Stock in shares of Common
Stock, (ii) subdivide outstanding shares of Common Stock into a larger
number of shares; (iii) effect a reverse stock split (other than a
reverse stock split as contemplated by Section 6(b) below) or (iv) issue
any shares of the Common Stock by reclassification of shares of Common
Stock, then (A) the Exercise Price thereafter shall be determined by
multiplying the Exercise Price by a fraction the numerator of which shall
be the number of shares of Common Stock outstanding before such event and
the denominator of which shall be the number of shares of Common Stock
outstanding after such event and (B) the number of Warrant Shares shall
be multiplied by a fraction, the numerator of which shall be the number
of shares of Common Stock outstanding after such event and the
denominator of which shall be the number of shares of Common Stock
(excluding treasury shares, if any) outstanding before such event. Any
adjustment made pursuant to this paragraph 6(a) shall become effective
immediately after the record date for the determination of stockholders
entitled to receive such dividend or distribution and shall become
effective immediately after the effective date in the case of a
subdivision or re-classification.

		
	 	      b. Reverse Stock Splits. If the Company undertakes a reverse stock
split in response to a notice from AMEX, or any other National Market on
which the Common Stock is then trading, that the Common Stock is trading
below AMEX’s or such other National Market’s requirements for continued
listing, the Exercise Price shall be adjusted to the Average Price for
the ten consecutive Trading Days commencing forty-five (45) days after
the reverse stock split.

		
	 	      c. Extraordinary Dividends and Distributions. In case the Company at
any time or from time to time after the date hereof shall declare, order,
pay or make a dividend or other distribution (including, without
limitation, any distribution of other or additional stock or Convertible
Securities or other securities or property or Options by way of dividend,
spin-off, reclassification, recapitalization or similar corporate
rearrangement) on the Common Stock other than (a) a dividend payable in
additional shares of Common Stock or (b) a dividend payable in cash and
declared out of the earned surplus of the Company as at the date hereof
as increased by any credits (other than credits resulting from a
revaluation of property) and decreased by any debits made thereto after
such date, then, and in each such case the Exercise Price in effect
immediately prior to the close of

3

		
	 	business on the record date fixed for the determination of holders
of any class of securities entitled to receive such dividend or
distribution shall be reduced, effective as of the close of business on
such record date, to a price determined by multiplying such Exercise
Price by a fraction

		
	 	      (i) the numerator of which shall be the Per Share Market Value
in effect on such record date or, if the Common Stock trades on an
ex-dividend basis, on the date prior to the commencement of
ex-dividend trading, less the fair market value of such dividend or
distribution (as determined in good faith by the Board of Directors
of the Company) applicable to one share of Common Stock, and

		
	 	      (ii) the denominator of which shall be such Per Share Market
Value

		
	 	      d. Record Date. If the Company establishes a record date for the
purpose of entitling holders of Common Stock to receive a dividend or
other distribution payable in Common Stock, Options or Convertible
Securities, then, for the purposes of this Section 6, such record date
will be deemed to be the date of the issue or sale of the shares of
Common Stock deemed to have been issued or sold upon the declaration of
such dividend or the making of such other distribution, as the case may
be.

		
	 	      e. Adjustment to Exercise Price.

		
	 	      (i) If the Company, at any time while this Warrant is
outstanding, takes any of the actions described in this Section
6(e) (other than in a transaction covered by Section 5(b)), then,
in order to prevent dilution of the rights granted under this
Warrant, the Exercise Price will be adjusted from time to time as
provided in this Section 6(e).

		
	 	      (A) issues or sells any Common Stock (other than Excluded
Securities);

		
	 	      (B) grants, issues or sells any rights, options or warrants to
subscribe for or to purchase Common Stock or any stock or other
securities convertible into or exchangeable for Common Stock (such
rights, options or warrants being herein called “Options” and such
convertible or exchangeable stock or securities being herein called
“Convertible Securities”) (other than Excluded Securities); or

		
	 	      (C) issues or sells any Convertible Securities (other than
Excluded Securities);

		
	 	for (1) with respect to paragraph (i)(A) above, a price per share,
or (2) with respect to paragraphs (i)(B) or (i)(C) above, a price
per share for which Common Stock issuable upon the exercise of such
Options or upon conversion or exchange of such Convertible
Securities is, less than the Exercise Price in effect immediately
prior to such issuance, grant or sale, then, immediately after such
issuance, grant or sale the Exercise Price then in effect shall be
reduced to an amount equal to the consideration per share of Common
Stock received or to be received in connection with such issuance,
grant or sale (including, the consideration, if any, to be received
upon the exercise of such Options or the

4

		
	 	conversion or exchange of such Convertible Securities). If there
is a change at any time in (x) the exercise price provided for in
any Options, (y) the additional consideration, if any, payable upon
the conversion or exchange of any Convertible Securities or (z) the
rate at which any Convertible Securities are convertible into or
exchangeable for Common Stock, then immediately after such change
in exercise price, additional consideration or rate of conversion
or exchange, the Exercise Price in effect at the time of such
change shall be further readjusted to give effect to such changed
exercise price, additional consideration or changed conversion or
exchange rate, as the case may be.

		
	 	      (ii) Effect on Exercise Price of Certain Events. For purposes
of determining the adjusted Exercise Price under Section 6(e)(i),
the following shall be applicable:

		
	 	      (A) Calculation of Consideration Received. If any Common
Stock, Options or Convertible Securities are issued or sold for
cash, the consideration received therefor will be deemed to be the
amount received by the Company therefor, without deducting any
expenses paid or incurred by the Company or any commissions or
compensations paid or concessions or discounts allowed to
underwriters, dealers or others performing similar services in
connection with such issue or sale. In case any Common Stock,
Options or Convertible Securities are issued or sold for a
consideration other than cash, the amount of the consideration
other than cash received by the Company will be the fair value of
such consideration, except where such consideration consists of
securities listed or quoted on a National Market, in which case the
amount of consideration received by the Company will be the Average
Price of such security for the ten (10) consecutive Trading Days
immediately preceding the date of receipt thereof. The fair value
of any consideration other than cash or securities listed or quoted
on a National Market will be determined jointly by the Company and
the Registered Owners of a majority of the Transaction Warrants
then outstanding. If such parties are unable to reach agreement
within ten (10) days after the occurrence of an event requiring
valuation (the “Valuation Event”), the fair value of such
consideration will be determined within forty-eight (48) hours of
the tenth (10th) day following the Valuation Event by an Appraiser
selected in good faith by the Company, and agreed upon in good
faith by the Registered Owners of a majority of the Transaction
Warrants then outstanding. The determination of such Appraiser
shall be binding upon all parties absent manifest error.

		
	 	      (B) Integrated Transactions. In case any Option is issued in
connection with the issue or sale of other securities of the
Company, together comprising one integrated transaction in which no
specific consideration is allocated to such Options by the parties
thereto the aggregate consideration of the Options shall be
determined by an Appraiser selected mutually, in good faith, by the
Registered Owners of a majority interest of the Transaction
Warrants and the Company.

		
	 	      (C) Treasury Shares. The number of shares of Common Stock
outstanding at any given time shall not include shares owned or
held by or for the Company’s

5

		
	 	account, if any, and the disposition of any shares so owned or
held shall be considered an issue or sale of Common Stock by the
Company.

		
	 	      (D) Certain Events. If the Company grants any stock
appreciation rights, phantom stock rights or other rights with
equity features (excluding the issuance of any Excluded Securities)
that adversely affects the rights of any Registered Owner of the
Warrants, but is not expressly provided for by Section 6 hereof,
then the Board will make an appropriate adjustment in the Exercise
Price so as to protect the rights of the Registered Owners or
assigns; provided, however, that no such adjustment will increase
the Exercise Price.

		
	 	      Notwithstanding the foregoing, in no event, other than a reverse
stock split, shall any provision in this Section 6 cause the Exercise
Price to be greater than the Exercise Price on the date of issuance of
this Warrant.

		
	 	      f. Adjustment of Number of Shares. For the avoidance of doubt, upon
each adjustment in the Exercise Price pursuant to any provision of this
Section 6 (other than Section 6(a)) the number of shares of Common Stock
purchasable hereunder shall be adjusted, to the nearest 1/100th of a
share, to the product obtained by multiplying such number of shares
purchasable immediately prior to such adjustment in the Exercise Price by
a fraction, the numerator of which shall be the Exercise Price
immediately prior to such adjustment and the denominator of which shall
be the Exercise Price immediately thereafter.

		
	 	      g. Rounding. All calculations under this Section 6 shall be made to
the nearest cent or the nearest 1/100th of a share, as the case may be.

		
	 	      h. Mandatory Redemption. In case (a) the Company refuses to honor a
duly executed Warrant Exercise Form delivered pursuant to Section 5
hereof, (b) the Company fails to deliver to the Registered Owner such
certificate or certificates pursuant to Section 5 on or prior to the
fifteenth (15th) Trading Day after the Exercise Date, (c)(i) a
Registration Statement for the Warrant Shares shall not have been
declared effective by the Securities and Exchange Commission on or prior
to the 150th day after the closing date of the Additional Investment or
December 28, 2001, whichever is earlier or, (ii) after its initial
effectiveness and prior to the expiration of the Company’s obligation to
keep the Registration Statement effective as required under the
Registration Rights Agreement, such Registration Statement lapses in
effect or sales of all of the Warrant Shares otherwise cannot be made
thereunder (other than by reason of any actions taken by a Registered
Owner) for more than twenty (20) consecutive days or forty (40) days in
any twelve (12) month period (other than by reason of Section 3(q) of the
Registration Rights Agreement), (d) the Common Stock shall be delisted
from AMEX or shall be suspended from trading on AMEX without resuming
trading and/or being relisted thereon or having such suspension lifted,
as the case may be, within ten (10) Business Days, (e) the Company makes
an Unauthorized Transfer without advance written consent of the
Registered Owner or (f) the Company consummates a Change of Control
Transaction (each a “Redemption Event”), the Registered Owner shall have
the option to require the Company to redeem, from funds legally available
therefor at the time of such redemption, in cash (the “Redemption Right”)
the Registered Owner’s shares of Common Stock

6

		
	 	immediately theretofore acquirable and receivable upon the exercise
of this Warrant at a price per share equal to the product of (i) the
Average Price immediately preceding the effective date, the date of the
closing, or date of consummation, as the case may be, of the Redemption
Event triggering such Redemption Right minus the Exercise Price of this
Warrant and (ii) the number of shares of Common Stock issuable upon
exercise of this Warrant immediately prior to such Redemption Event (the
“Mandatory Redemption Price”). The Company shall pay the applicable
Mandatory Redemption Price to the Registered Owner of the Warrants being
redeemed in cash on the Redemption Date; except that in the event of an
occurrence of a Redemption Event specified in (d) above, the Company
shall issue to the Registered Owner on the Redemption Date a promissory
note in the principal amount equal to the Redemption Price, bearing
interest at the rate of 1.0% per month and payable in full 90 days after
the Redemption Date. If the Company shall fail to pay the applicable
Mandatory Redemption Price to such Registered Owner on the Redemption
Date, the sole monetary remedy that such Registered Owner will have is
that such unpaid amount shall bear interest at the rate of 1.0% per month
until paid in full.

		
	 	      i. Optional Redemption.

		
	 	      (i) Optional Redemption. This Warrant is redeemable in whole
or in part at the option of the Company at any time, subject to the
conditions set forth in this Section 6(i)(i) in either of the
following circumstances:

		
	 	      (A) Commencing on the first Business Day immediately after
nine (9) months following the Effectiveness Date (as defined in the
Registration Rights Agreement), provided that the closing price of
the Company’s Common Stock is greater than $6.00 for twenty (20)
consecutive Trading Days.

		
	 	      (B) After the Original Issue Date, if the Warrants outstanding
represent less than 5% of the Warrant Shares to be issued upon
exercise of the Warrants issued on the Original Issue Date remain
unexercised, excluding from such calculation any Warrants held by
Affiliate of the Company as of such date (other than any Registered
Owner or transferees or successors or permitted assigns thereof if
such Registered Owner is deemed to be an Affiliate solely by reason
of its holding of Preferred Stock and Transaction Warrants)

		
	 	      (ii) Redemption Notice. Subject to the conditions set forth
in Section 6(i)(i), so long as any Registration Statement required
to be filed and be effective pursuant to the Registration Rights
Agreement is then in effect and has been in effect and sales of all
of the Registrable Securities could have been made thereunder for
at least twenty (20) days prior to the Redemption Notice Date (as
defined below), upon twenty (20) Trading Days’ prior written notice
to the Registered Owner (a “Redemption Notice”), the Warrant may be
redeemed by the Company, in whole or in part, at a redemption price
equal to $.10 per Warrant (the “Optional Redemption Price”).

		
	 	      (iii) Mechanics of Redemption. The Company shall exercise its
right to redeem by delivering its Redemption Notice by facsimile
and overnight courier to

7

		
	 	each Registered Owner (such date that the Redemption Notice is
given on the “Redemption Notice Date”). Such Redemption Notice
shall indicate (A) the Optional Redemption Price, (B) each
Registered Owner’s pro rata allocation of the Warrants to be
redeemed, and (C) the date that the Company shall effect the
redemption (the “Redemption Date”). The Redemption Date shall be
not less than twenty (20) Trading Days and not more than sixty (60)
calendar days after the Redemption Notice Date. Notwithstanding
anything in this Section 6(i), the Company shall effect the
exercise of any Warrant pursuant to Section 5 if the Warrant
Exercise Form is received by the Company, together with the
Exercise Price in cash and the Warrant, before the Redemption Date.

		
	 	      (iv) Payment of Optional Redemption Price. The Company shall
pay the applicable Optional Redemption Price to the Registered
Owner of the Warrants being redeemed in cash on the Redemption Date
(or, if later, the Business Day following the Business Day upon
which the Company receives the Warrant). If the Company shall fail
to pay the applicable Optional Redemption Price to such Registered
Owner on the Redemption Date, the sole monetary remedy such
Registered Owner will have is that such unpaid amount shall bear
interest from Redemption Date (or, if later, the Business Day
following the Business Day upon which the Company receives the
Warrant) at the rate of 1.0% per month until paid in full.

      7. AMEX Limitation. If on any date (the “Threshold Date”) (a) the Common
Stock is listed for trading on AMEX (or any other National Market), (b) the
Exercise Price then in effect is such that the aggregate number of shares of
Common Stock that would then be issuable upon exercise in full of the then
outstanding Class F Warrants if all such Class F Warrants were exercised on
such Threshold Date (without regard to any limitations on exercise) combined
with all other issuances of Common Stock, which under the requirements of AMEX
(or any other National Market) are required to be aggregated with such issuance
(including, without limitation, the shares of Common Stock issuable pursuant to
the Certificate of Designation and the shares of Common Stock issuable upon the
exercise of the Class E Warrants) for determining the need for stockholder
approval (“Stockholder Approval”) for the listing of the shares to be issued on
AMEX (or any other National Market), would equal or exceed 19.9% of the number
of shares of the Common Stock outstanding immediately prior to the Original
Issuance Date (the “Issuable Maximum”), and (c) the issuance of shares of
Common Stock in excess of the Issuable Maximum shall not have been approved by
the stockholders of the Company in accordance with the applicable rules and
regulations of AMEX (or any other National Market), then with respect to the
aggregate number of shares of Common Stock issuable upon the exercise of the
Class F Warrants then held by the Registered Owners for which an exercise in
accordance with the Exercise Price would result in an issuance of shares of
Common Stock in excess of the Issuable Maximum (the “Excess Amount”), the
Company shall use its reasonable efforts to obtain the Stockholder Approval
applicable to such issuance as soon as is possible, but in any event not later
than the 90th day after the Threshold Date unless the Company has previously
used its commercially reasonable efforts to, but has failed to, obtain such
approval; provided that such Stockholder Approval will satisfy the applicable
rules and regulations of the AMEX (or other National Market). If such
Stockholder Approval is not obtained the Company shall pay to such Registered
Owner an amount in cash equal to (1) the Average Price on the Threshold Date
minus

8

 the Exercise Price multiplied by (2) the number of shares of Common Stock
issuable upon the exercise of this Warrant equal to the Excess Amount.

      Notwithstanding any provision of this Warrant to the contrary, unless and
until Stockholder Approval is obtained, in no event shall the Company be
required to issue any shares of Common Stock upon the exercise of this Warrant
if, after giving effect to such exercise, the aggregate number of shares of
Common Stock previously issued upon the exercise of Class E Warrants and Class
F Warrants and issued by the Company pursuant to the Certificate of
Designation, combined with all other issuances of Common Stock, which under the
requirements of AMEX (or any other National Market) are required to be
aggregated with such issuances for determining the need for Stockholder
Approval, would equal or exceed the Maximum Amount.

      8. Restriction on Exercise by the Registered Owner. Notwithstanding
anything herein to the contrary, in no event shall the Registered Owner have
the right or be required to exercise this Warrant if as a result of such
exercise the aggregate number of shares of Common Stock beneficially owned by
such Registered Owner and its Affiliates would exceed 4.99% of the outstanding
shares of the Common Stock following such exercise. For purposes of this
Section 8, beneficial ownership shall be calculated in accordance with Section
13(d) of the Exchange Act. The provisions of this Section 8 may be waived by a
Registered Owner as to itself (and solely as to itself) upon not less than
sixty-five (65) days, prior written notice to the Company, and the provisions
of this Section 8 shall continue to apply until such 65th day (or later, if
stated in the notice of waiver). In no event shall the Company have any
liability under the terms of this Warrant or otherwise to the Registered Owner
or any permitted assign in the event that such Registered Owner or permitted
assign, upon the exercise of all or a portion of this Warrant, beneficially
owns more than 4.99% of the outstanding shares of Common Stock following such
exercise.

      9. Officer’s Certificate. Whenever the number of shares purchasable upon
exercise shall be adjusted as required by the provisions of Section 6, the
Company shall forthwith file in the custody of its secretary or an assistant
secretary at its principal office and with its stock transfer agent, if any, an
officer’s certificate showing the adjusted Exercise Price, number of shares or
other securities determined as herein provided, setting forth in reasonable
detail the facts requiring such adjustment and the manner of computing such
adjustment. Each such officer’s certificate shall be signed by the chairman,
president or chief financial officer of the Company and by the secretary or any
assistant secretary of the Company. Each such officer’s certificate shall be
made available at all reasonable times for inspection by any Registered Owner
of the Warrants and the Company shall, forthwith after each such adjustment,
deliver a copy of such certificate to the each of the Registered Owners.

      10. Definitions. Capitalized terms used herein and not otherwise defined
herein shall have the meanings given to such terms in the Purchase Agreement.
As used in this Warrant, the following terms have the following meanings:

      “Additional Investment” has the meaning set forth in the Purchase
Agreement.

      “Affiliate” means, with respect to any Person, another Person that,
directly or indirectly, (i) controls that Person, (ii) is controlled by that
Person or (iii) is under common control with that Person. “Control” for
purposes of this Warrant, when used with respect to any Person, means the

9

 possession, direct or indirect, of the power to cause the direction of the
management and policies of such Person, whether through the ownership of voting
securities, by contract or otherwise; and the terms “affiliated”, “controlling”
and “controlled” have meanings correlative to the foregoing.

      “AMEX” means American Stock Exchange.

      “Appraiser” means a nationally recognized or major regional investment
banking firm or firm of independent certified public accountants of recognized
standing.

      “Approved Stock Plan” means any contract, plan or agreement which has been
approved by the Board or a committee thereof, pursuant to which the Company’s
securities may be issued to any of the Company’s employees, officers or
directors.

      “Average Price” on any date means (x) the sum of the Per Share Market
Value for the ten (10) Trading Days immediately preceding such date minus (y)
the highest and lowest Per Share Market Value during the ten (10) Trading Days
immediately preceding such date, divided by (z) eight (8), or a similar
calculation if another figure for the number of Trading Days is set forth for
clause (x) of this definition.

      “Business Day” means any day except Saturday, Sunday and any day which
shall be a legal holiday in the State of New York or a day on which banking
institutions in the State of New York generally are authorized or required by
law or other government action to close.

      “Cashless Exercise” has the meaning assigned to it in Section 5(b) hereof.

      “Certificate of Designation” has the meaning set forth in the Purchase
Agreement.

      “Change of Control Transaction” means the consummation of any of (i) any
acquisition or series of related acquisitions by any Person or “group” (as
described in Section 13(d)(3) of the Exchange Act) of in excess of fifty
percent (50%) of the voting power of the Company, (ii) the merger or
consolidation of the Company with or into another Person (regardless of whether
such transaction is with one or more Affiliates of the Company) or (iii) a
sale, conveyance, lease, transfer or disposition of all or substantially all of
the Company’s assets in one or a series of related transactions (regardless of
whether such transaction is with one or more Affiliates of the Company).

      “Class E Warrants” means the Class E Warrants of the Company issued
pursuant to the Purchase Agreement and in connection with the Additional
Investment.

      “Class F Warrants” means the Class F Warrants of the Company issued
pursuant to the Purchase Agreement and in connection with the Additional
Investment.

      “Closing” has the meaning set forth in Section 1.2 of the Purchase
Agreement.

      “Closing Date” has the meaning set forth in Section 1.2 of the Purchase
Agreement.

      “Common Stock” means the shares of the Company’s Common Stock, par value
$0.01 per share.

10

      “Company” means Antex Biologics Inc., a Delaware corporation.

      “Convertible Securities” has the meaning assigned to it in Section
6(e)(i)(B) hereof.

      “Distribution Date” has the meaning assigned to it in Section 21 hereof.

      “DTC” has the meaning assigned to it in Section 5(c) hereof.

      “Excess Amount” has the meaning assigned to it in Section 7 hereof.

      “Exchange Act” means the Securities Exchange Act of 1934, as amended.

      “Excluded Securities” means (i) shares of Common Stock, Options or
Convertible Securities issued or issuable pursuant to the terms of this Warrant
and the Purchase Agreement, (ii) shares of Common Stock, Options or
Convertible Securities issued by the Company in connection with an Approved
Stock Plan, (iii) shares of Common Stock, Options or Convertible Securities
issuable upon the exercise of any options, rights or warrants outstanding as of
July 3, 2001 and set forth on Schedule 2.1(c) of the Purchase Agreement, (iv)
shares of Common Stock, Options or Convertible Securities issued or issuable in
connection with a bank credit agreement or a real estate or equipment lease or
(iv) shares of Common Stock, Options or Convertible Securities issued or deemed
to be issued by the Company in connection with acquisition, merger, partnering,
licensing or strategic transactions.

      “Exercise Period” has the meaning assigned to it the Section 4 hereof.

      “Exercise Price” has the meaning assigned to it in Section 3 hereof

      “Issuable Maximum” has the meaning assigned to it in Section 7 hereof.

      “Mandatory Redemption Price” has the meaning assigned to it in Section
6(h) hereof.

      “National Market” means the NASDAQ National Market, the NASDAQ SmallCap
Market, the New York Stock Exchange and the AMEX.

      “Optional Redemption Price” has the meaning assigned to it in Section 6(i)
hereof.

      “Options” has the meaning assigned to it in Section 6(e)(i)(B) hereof.

      “Original Issue Date” shall mean the Closing Date.

      “OTCBB” means the Over-the-Counter Bulletin Board of the National
Association of Securities Dealers, Inc.

      “Per Share Market Value” means on any particular date (a) the closing bid
price per share of the Common Stock on such date on (i) the National Market on
which the Common Stock is then listed or quoted, or, if there is no such price
on such date, then the closing bid price on such exchange or quotation system
on the date nearest preceding such date, or (ii) the OTCBB, as reported by the
National Quotation Bureau Incorporated (or similar organization or agency
succeeding to its function of reporting prices), or (b) if the Common Stock is
not then listed or quoted on any National Market or the OTCBB, the fair market
value of a share of Common

11

 Stock as determined by an Appraiser selected in good faith by the
Registered Owners of a majority in interest of the Warrants; provided,
however, that the Company, after receipt of the determination by such
Appraiser, shall have the right to select, in good faith, an additional
Appraiser, in which case the fair market value shall be equal to the average of
the determinations by each such Appraiser; and provided, further that all
determinations of the Per Share Market Value shall be appropriately adjusted
for any stock dividends, stock splits or other similar transactions during the
period for calculation of the Average Price.

      “Person” means an individual or a corporation, partnership, trust,
incorporated or unincorporated association, joint venture, limited liability
company, joint stock company, government (or an agency or political subdivision
thereof) or other entity of any kind.

      “Purchase Agreement” means that certain Securities Purchase Agreement,
dated July 3, 2001, among the Company and the Purchasers.

      “Purchaser” has the meaning set forth in the Purchase Agreement.

      “Redemption Date” has the meaning assigned to it in Section 6(i) hereof.

      “Redemption Event” has the meaning assigned to it in Section 6(h) hereof.

      “Redemption Notice” has the meaning assigned to it in Section 6(i) hereof.

      “Redemption Notice Date” has the meaning assigned to it in Section 6(i)
hereof.

      “Redemption Right” has the meaning assigned to it in Section 6(h) hereof.

      “Registered Owner” means the person identified on the face of this Warrant
as the registered owner hereof or such other person as shown on the records of
the Company as being the registered owner of this Warrant or their assigns.

      “Registration Rights Agreement” means that certain Registration Rights
Agreement, dated July 3, 2001, among the Company and the Purchasers.

      “Registration Statement” has the meaning set forth in the Registration
Rights Agreement.

      “Rights” has the meaning assigned to it in Section 21 hereof.

      “Rights Plan” has the meaning assigned to it in Section 21 hereof.

      “Securities Act” means the Securities Act of 1933, as amended.

      “Stockholder Approval” has the meaning assigned to it in Section 7 hereof.

      “Threshold Date” has the meaning assigned to it in Section 7 hereof.

      “Trading Day(s)” means any day on which the OTCBB or any National Market
on which the Common Stock is then listed or quoted is open for trading.

12

      “Transaction Warrant(s)” means the Class E Warrants and Class F Warrants
issued at the Closing.

      “Unauthorized Transfer” means the transfer of any material assets or an
interest in any material assets to an Affiliate or other Person who will be an
Affiliate after the transfer (other than an Affiliate that is wholly-owned by
the transferor) in connection with a sale of securities by any such Affiliate
to a Person other than a strategic investor.

      “Valuation Event” has the meaning assigned to it in Section 6(e)(ii)(A)
hereof.

      “Warrant Shares” has the meaning assigned to it in Section 2 hereof.

      11. Registration Rights. The Company will undertake the registration of
the Common Stock into which the Warrants are exercisable at such times and upon
such terms pursuant to the provisions of the Registration Rights Agreement.

      12. Reservation of Shares; Listing. The Company covenants that it will at
all times reserve and keep available out of its authorized shares of Common
Stock, free from preemptive rights, solely for the purpose of issue upon
exercise of this Warrant as herein provided, such number of shares of the
Common Stock as shall then be issuable upon the exercise of this Warrant. The
Company shall promptly secure the listing of the shares of Common Stock
issuable upon exercise of this Warrant upon each national securities exchange
or automated quotation system, if any, upon which shares of Common Stock are
then listed (subject to official notice of issuance upon exercise of this
Warrant) and shall maintain, so long as any other shares of Common Stock shall
be so listed, such listing of all shares of Common Stock from time to time
issuable upon the exercise of this Warrant; and the Company shall so list on
each national securities exchange or automated quotation system, as the case
may be, and shall maintain such listing of, any other shares of capital stock
of the Company issuable upon the exercise of this Warrant if and so long as any
shares of the same class shall be listed on such national securities exchange
or automated quotation system.

      13. Notices. Any notices, consents, waivers or other communications
required or permitted to be given under the terms of this Warrant shall be in
writing and shall be deemed to have been delivered (a) upon receipt, when
delivered personally; (b) upon receipt, when sent by facsimile, provided
confirmation of transmission is mechanically or electronically generated and
kept on file by the sending party (if received by 5:30 p.m. EST where such
notice is received) or the first business day following such delivery (if
received on or after 5:30 p.m. EST where such notice is received); or (c) two
business days after deposit with a nationally recognized overnight courier, in
each case properly addressed to the party to receive the same. The addresses
and facsimile numbers for such communications shall be:

13

		
	 	      If to the Company:

	 	Antex Biologics Inc.

300 Professional Drive

Gaithersburg, Maryland 20879

Telephone: (301) 590-0129

Facsimile: (301) 590-1252

Attention: V.M. Esposito, Chairman and CEO

		
	 	      With a copy to:

	 	Covington & Burling

1201 Pennsylvania Avenue, N.W.

Washington, D.C. 20004

Telephone: (202) 662-6000

Facsimile: (202) 662-6291

Attention: D. Michael Lefever, Esq.

		
	 	      If to the Transfer Agent:

	 	American Stock Transfer and Trust Company

40 Wall Street

New York, New York 10005

Telephone: (718) 921-8293

Facsimile: (718) 921-8334

Attention: Isaac Freilich

		
	 	      If to Registered Owner to:

	 	[Name]

[Address]

[City/State/Zip Code]

Telephone: [__________]

Facsimile: [__________]

Attention: [__________]

		
	 	      With a copy to:

	 	[Name]

[Address]

[City/State/Zip Code]

Telephone: [__________]

Facsimile: [__________]

Attention: [__________]

Each party shall provide written notice to the other party of any change in
address or facsimile number in accordance with the provisions hereof.

14

      14. Compliance With Governmental Requirements. The Company covenants that
if any shares of Common Stock required to be reserved for purposes of the
exercise of this Warrant require registration with or approval of any
governmental authority under any federal or state law, or any national
securities exchange or automated quotation system, before such shares may be
issued upon exercise, the Company will use its reasonable efforts to cause such
shares to be duly registered or approved, as the case may be.

      15. Fractional Shares. Upon any exercise hereunder, the Company shall not
be required to issue stock certificates representing fractions of shares of the
Common Stock, but may if otherwise permitted make a cash payment in respect of
any final fraction of a share based on the Per Share Market Value at such time.
If the Company elects not, or is unable, to make such a cash payment, the
Registered Owner shall be entitled to receive, in lieu of the final fraction of
a share in lieu of a final fractional share of one-half or more, one whole
share of Common Stock, or, if less than one-half, nothing.

      16. Payment of Tax Upon Issue of Transfer. The issuance of certificates
for shares of the Common Stock upon exercise of this Warrant shall be made
without charge to the Registered Owner for any documentary, stamp or similar
taxes that may be payable in respect of the issue or delivery of such
certificate, provided that the Company shall not be required to pay any tax
that may be payable in respect of any transfer involving the issuance and
delivery of any such certificate upon exercise in a name other than that of the
Registered Owner 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 such tax or shall have
established to the satisfaction of the Company that such tax has been paid or
is not payable.

      17. Warrants Owned by Company Deemed Not Outstanding. In determining
whether the holders of the outstanding Warrants have concurred in any
direction, consent or waiver under this Warrant, Warrants which are owned by
the Company or any other obligor on the Warrants or by any Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with the Company or any other obligor on the Warrants shall be
disregarded and deemed not to be outstanding for the purpose of any such
determination; provided that any Warrants owned by the Purchasers (as defined
in the Purchase Agreement) shall be deemed outstanding for purposes of making
such a determination. The Registered Owner may pledge the Warrants with the
prior consent of the Company, which consent will not be unreasonably withheld.
Warrants so owned which have been pledged in good faith may be regarded as
outstanding if the pledgee establishes to the satisfaction of the Company the
pledgee’s right so to act with respect to such Warrants and that the pledgee is
not the Company or any other obligor on the Warrants or any Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with the Company or any other obligor on the Warrants.

      18. Titles/Headings. The titles and headings herein are for convenience
only, do not constitute a part of this Warrant and shall not be deemed to limit
or affect any of the provisions hereof.

      19. No Rights as Stockholder. This Warrant shall not entitle the
Registered Owner to any rights as a stockholder of the Company, including
without limitation, the right to vote, to receive dividends and other
distributions, or to receive notice of, or to attend, meetings of

15

 stockholders or any other proceedings of the Company, unless and to the
extent exercised for shares of Common Stock in accordance with the terms
hereof.

      20. Certain Actions Prohibited. The Company will not, by amendment of its
charter 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 to be observed or performed by it hereunder, but will at all times in
good faith assist in the carrying out of all the provisions of this Warrant and
in the taking of all such action as may reasonably be requested by the holder
of this Warrant in order to protect the exercise privilege of the holder of
this Warrant against dilution or other impairment, consistent with the tenor
and purpose of this Warrant. Without limiting the generality of the foregoing,
the Company (i) will not increase the par value of any shares of Common Stock
receivable upon the exercise of this Warrant above the Exercise Price then in
effect, and (ii) will take all such actions as may be necessary or appropriate
in order that the Company may validly and legally issue fully paid and
nonassessable shares of Common Stock upon the exercise of this Warrant.

      21. Shareholder Rights Plan. In the event that the Company shall
distribute “poison pill” rights (“Rights”) pursuant to a “poison pill”
shareholder rights plan (a “Rights Plan”), the Company shall, in lieu of making
any adjustment pursuant to Section 6, make proper provision so that each
Registered Owner who exercises this Warrant after the record date for such
distribution and prior to the expiration or redemption of the Rights Plan shall
be entitled to receive upon such exercise, in addition to the shares of Common
Stock issuable upon such exercise, a number of Rights to be determined as
follows: (i) if such exercise occurs on or prior to the date for the
distribution to the holders of Rights of separate certificates evidencing such
Rights (the “Distribution Date”), the same number of Rights to which a holder
of a number of shares of Common Stock equal to the number of shares of Common
Stock issuable upon such exercise at the time of such exercise would be
entitled in accordance with the terms of the Rights Plan; and (ii) if such
exercise occurs after the Distribution Date, the same number of Rights to which
a holder of the number of shares of Common Stock into which this Warrant was
exercisable immediately prior to the Distribution Date would have been entitled
on the Distribution Date in accordance with the terms of the Rights Plan to the
extent permitted by the terms and conditions of the Rights Plan.

      22. Successors and Assigns. This Warrant shall be binding upon and inure
to the benefit of the Registered Owner and its permitted assigns, and shall be
binding upon any Person succeeding to the Company by merger or acquisition of
all or substantially all of the assets of the Company. The Company may not
assign this Warrant or any rights or obligations hereunder without the prior
written consent of the Registered Owner. The Registered Owner may assign this
Warrant without the prior written consent of the Company, subject to compliance
with the federal securities laws and applicable state securities laws.

      23. Governing Law. This Warrant shall be governed by and construed and
enforced in accordance with the internal laws of the State of New York without
regard to the principles of conflicts of law thereof. Each party hereby
irrevocably submits to the nonexclusive jurisdiction of the state and federal
courts sitting in the City of New York, Borough of Manhattan, for the
adjudication of any dispute hereunder or in connection herewith or with any
transaction contemplated hereby or discussed herein, and hereby irrevocably
waives, and agrees not to assert in any suit, action or proceeding, any claim
that it is not personally subject to the jurisdiction of

16

 any such court, or that such suit, action or proceeding is improper. Each
party hereby irrevocably waives personal service of process and consents to
process being served in any such suit, action or proceeding by mailing a copy
thereof to such party at the address for such notices to it under this Warrant
and agrees that such service shall constitute good and sufficient service of
process and notice thereof. Nothing contained herein shall be deemed to limit
in any way any right to serve process in any manner permitted by law. EACH
PARTY HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE, AND AGREES NOT TO
REQUEST, A JURY TRIAL FOR THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN
CONNECTION HEREWITH OR WITH ANY TRANSACTION CONTEMPLATED HEREBY OR DISCUSSED
HEREIN.

      IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its duly authorized officer as of the date first set forth above.

	 	 
	 	ANTEX BIOLOGICS INC.
	 
	 	By:____________________________

Name:__________________________

Title:___________________________

17

EXHIBIT A

Warrant Exercise Form

      TO:   ANTEX BIOLOGICS INC.

      The undersigned hereby: (1) irrevocably elects to purchase _______ shares
of Common Stock of Antex Biologics Inc., a Delaware corporation (“Antex”),
pursuant to the exercise of Warrant No. ___ heretofore issued to
___________________ on ____________, 200__; (2) encloses a cash payment of
$__________ for these shares at a price of $  per share (reflecting any
adjustments made pursuant to the provisions of the Warrant); and (3) requests
that a certificate for the shares be issued in the name of the undersigned and
delivered to the undersigned at the address specified below; or

      The undersigned hereby: (1) irrevocably elects to exercise Warrant(s) to
purchase _____ shares of Common Stock of Antex Biologics Inc., pursuant to
Warrant No. _____ heretofore issued to _____ on _____, 2001; (2) authorizes
Antex to withhold from the shares of Common Stock otherwise deliverable
pursuant to this Exercise Notice shares of Common Stock having a fair market
value (calculated in accordance with the terms of the Warrant) equal to the
number of shares being purchased multiplied by the exercise price of $  per
share (reflecting any adjustments made pursuant to the provisions of the
Warrant); and (3) requests that a certificate for the shares be issued in the
name of the undersigned and delivered to the undersigned at the address
specified below.

	 	 	 	 	 
	Date:	                        
                    			

	 	 	 	 	 
	Investor Name:	                        
                    			

	 	 	 	 	 
	Taxpayer Identification	                        
                    			

	 	 	 	 	 
	Number:	                        
                    			

	 	 	 	 	 
	By:	                        
                    			

	 	 	 	 	 
	Printed Name:	                        
                    			

	 	 	 	 	 
	Title:	                        
                    			

	 	 	 	 	 
	Address:	                        
                    			
	
	
	
	

		                        
                    			
	
	
	
	

		                        
                    			

		
	 	Note: The above signature should correspond exactly
with the name on the face of this Warrant Certificate
or with the name of assignee appearing in assignment
form below.

18

AND, if said number of shares shall not be all the shares purchasable under the
within Warrant, a new Warrant Certificate is to be issued in the name of said
undersigned for the balance remaining of the shares purchasable thereunder less
any fraction of a share paid in cash and delivered to the address stated above.

19

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