RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                             SIGA TECHNOLOGIES, INC.
                             A Delaware Corporation

     Siga  Technologies,  Inc. a corporation  organized  and existing  under the
General Corporation Law of the State of Delaware, DOES HEREBY CERTIFY:

     FIRST: The name of the Corporation is Siga Technologies,  Inc. and the name
under   which   the   Corporation   was   originally   incorporated   was   Siga
Pharmaceuticals,  Inc.  The  date  of  filing  of its  original  Certificate  of
Incorporation  with the Secretary of State of the State of Delaware was December
28, 1995.

     SECOND: The Restated Certificate of Incorporation of Siga  Pharmaceuticals,
Inc. in the form attached  hereto as Exhibit A restates and  integrates but does
not further amend the Certificate of Incorporation of Siga  Technologies,  Inc.,
and  there  is no  discrepancy  between  the  provisions  of  the  Corporation's
Certificate  of  Incorporation  as heretofore  amended or  supplemented  and the
provisions of the Restated  Certificate of Incorporation  attached hereto, which
has been duly adopted in  accordance  with the  provisions of Section 245 of the
General Corporation Law of the State of Delaware by the unanimous consent of the
directors of the Corporation dated April 25th, 2000.

     THIRD:  The Restated  Certificate of Incorporation so adopted reads in full
as set forth in  Exhibit  A  attached  hereto  and  incorporated  herein by this
reference.

     IN WITNESS WHEREOF,  I have hereunto set my hand as Chief Executive Officer
of Siga Technologies, Inc. and hereby affirm under penalties of perjury that the
foregoing  is my act  and  deed  and the  facts  herein  stated  are  true,  and
accordingly have hereunto set forth my hand this 25th day of April, 2000

                                    /s/ Joshua D. Schein
                                    Joshua D. Schein
                                    Chief Executive Officer


                                     1


                                    RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                             SIGA TECHNOLOGIES, INC.

     FIRST:  The  name  of the  Corporation  is  Siga  Technologies,  Inc.  (the
"Corporation").

     SECOND: The address of the Corporation's  registered office in the State of
Delaware is 1013 Centre Road,  Wilmington,  County of New Castle 19805. The name
of the registered agent of the Corporation at such address is The  Prentice-Hall
Corporation System, Inc.

     THIRD:  The  purpose of the  Corporation  is to engage in any lawful act or
activity for which a Corporation may be organized under the General  Corporation
Law of Delaware.

     FOURTH: The total number of shares of stock which the Corporation shall
have  authority to issue is sixty million  (60,000,000),  of which fifty million
(50,000,000)  shares of the par  value of One  Hundredth  of One Cent  ($0.0001)
each,  amounting in the aggregate to Five Thousand  Dollars  ($5,000),  shall be
Common Stock, and of which ten million  (10,000,000)  shares of the par value of
One  Hundredth of One Cent  ($0.0001)  each,  amounting in the  aggregate to One
Thousand Dollars ($1,000), shall be Preferred Stock.

     The Board of Directors  shall have the authority to fix by  Resolution  the
voting  powers (full,  limited,  multiple,  fractional  or none),  designations,
preferences,  qualifications,  privileges,  limitations,  restrictions, options,
conversion rights and other special or relative rights of the Preferred Stock or
any class or series thereof prior to or  concurrently  with the issuance of such
shares.

     There shall be no cumulative voting rights for the Common Stock.

     The holders of the Common Stock and the  Preferred  Stock shall be entitled
to  dividends,  when,  as and if  declared  by the  Board  of  Directors  of the
Corporation,  payable  at such  time or times  as the  Board  of  Directors  may
determine.

     Subject to the  determination  of the Board of Directors with regard to the
Preferred Stock, in the event of any  liquidation,  dissolution or winding up of
the affairs of the Corporation,  whether voluntary or involuntary, all remaining
assets  and  funds  of  the  Corporation   available  for  distribution  to  its
stockholders  shall be  distributed  in equal  amounts  per  share  and  without
preference or priority of one class of common stock over the other.

     Any action may be taken by the  stockholders  of the  Corporation  by their
written consent without a stockholders' meeting.

     No stockholder of this Corporation shall by reason of his holding shares
of any class have any preemptive or preferential  right to purchase or subscribe
to any  shares  of any  class  of  this  Corporation,  now  or  hereafter  to be
authorized,  or any notes,  debentures,  bonds, or other securities  convertible
into or carrying  options or warrants  to purchase  shares of any class,  now or





hereafter to be authorized,  whether or not the issuance of any such shares,  or
such notes,  debentures,  bonds or other securities,  would adversely affect the
dividend or voting rights of such  stockholder,  other than such rights, if any,
as the board of directors, in its discretion from time to time may grant, and at
such price as the Board of Directors in its discretion may fix; and the Board of
Directors  may  issue  shares of any class of this  Corporation,  or any  notes,
debentures,  bonds, or other securities  convertible into or carrying options or
warrants to purchase  shares of any class,  without  offering any such shares of
any  class,  either in whole or in part,  to the  existing  stockholders  of any
class.

     FIFTH:  The number of  directors of the  Corporation  shall be such as from
time to time shall be fixed by, or in the manner provided in, the by-laws of the
Corporation.  No election of directors  need be by ballot  unless the by-laws so
provide.

     SIXTH:  The  Corporation  hereby  expressly  elects not to be  governed  by
Section 203 of the General Corporation Law of Delaware.

     SEVENTH:  No director of the Corporation  shall be personally liable to the
Corporation  or its  stockholders  for monetary  damages for breach of fiduciary
duty as a director,  provided,  however, that this provision shall not eliminate
or limit the liability of a director (i) for any breach of the  director's  duty
of loyalty to the  Corporation or its  stockholders,  (ii) for acts or omissions
not in good faith or which involve intentional misconduct or a knowing violation
of law, (iii) under Section 174 of the General  Corporation Law of Delaware,  or
(iv) from any transaction from which the director  derived an improper  personal
benefit.

     EIGHTH: The Corporation shall indemnify, in accordance with and to the full
extent now or hereafter permitted by law, any person who was or is a party or is
threatened to be made a party to any  threatened,  pending or completed  action,
suit or proceeding,  whether civil,  criminal,  administrative  or investigative
(including,   without  limitation,   an  action  by  or  in  the  right  of  the
Corporation),  by reason of his acting as a director of the Corporation (and the
Corporation, in the discretion of the Board, may so indemnify a person by reason
of the fact that he is or was an officer or employee of the Corporation or is or
was serving at the request of the  Corporation  in any other  capacity for or on
behalf of the  Corporation)  against  any  liability  or  expense  actually  and
reasonably incurred by such person in respect thereof; provided,  however, that,
the  Corporation  shall not be obligated  to indemnify  any such person (i) with
respect to proceedings,  claims or actions  initiated or brought  voluntarily by
such  person  and  not by way of  defense,  or  (ii)  for  any  amounts  paid in
settlement  of an action  effected  without  the prior  written  consent  of the
Corporation to such  settlement.  Such  indemnification  is not exclusive of any
other right to indemnification provided by law, agreement or otherwise.

      NINTH: No amendment to or repeal of Article Seven or Article Eight of this
Certificate of Incorporation  shall apply to or have any effect on the rights of
any individual referred to in Article Seven or Article Eight for or with respect
to acts or omissions of such  individual  occurring  prior to such  amendment or
repeal.

      TENTH:  Whenever a  compromise  or  arrangement  is proposed  between this
Corporation  and  its  creditors  or any  class  of  them  and/or  between  this
Corporation  and its  stockholders  or any



class of them, any court of equitable  jurisdiction within the State of Delaware
may, on the application in a summary way of this  Corporation or of any creditor
or  stockholder  thereof or on the  application  of any  receiver  or  receivers
appointed for this Corporation under the provisions of Section 291 of Title 8 of
the Delaware Code or on the  application  of trustees in  dissolution  or of any
receiver or receivers  appointed for this  Corporation  under the  provisions of
Section 279 of Title 8 of the Delaware Code, order a meeting of the creditors or
class of creditors,  and/or of the stockholders or class of stockholders of this
Corporation, as the case may be, to be summoned in such manner as the said court
directs.  If a majority  in number  representing  three-fourths  in value of the
creditors  or  class  of  creditors,  and/or  of the  stockholders  or  class of
stockholders of this Corporation, as the case may be, agree to any compromise or
arrangement and to any reorganization of this Corporation as consequence of such
compromise  or  arrangement,  the said  compromise or  arrangement  and the said
reorganization  shall, if sanctioned by the court to which the said  application
has been made, be binding on all the creditors or class of creditors,  and/or on
all the stockholders or class of stockholders,  of this Corporation, as the case
may be, and also on this Corporation.

     ELEVENTH:  The Board of  Directors  shall have power  without the assent or
vote of the stockholders to make,  alter,  amend,  change,  add to or repeal the
by-laws of the Corporation.

     TWELFTH: The Corporation shall have perpetual existence.

     IN WITNESS  WHEREOF,  I have  hereunto  set my hand this 24th day of April,
2000.

                                    SIGA TECHNOLOGIES, INC.


                                    By:   /s/Joshua D. Schein
                                        ------------------------
                                       Name:Joshua D. Schein
                                       Title:  Chief Executive
                                       Officer