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                                   EXHIBIT A

                                   AGREEMENT

                          JOINT FILING OF SCHEDULE 13G



     The  undersigned  hereby agree to jointly  prepare and file with regulatory
authorities a Schedule 13G and any future  amendments  thereto reporting each of
the  undersigned's  ownership of  securities  of Enzo  Biochem,  Inc. and hereby
affirm  that  such  Schedule  13G is  being  filed  on  behalf  of  each  of the
undersigned.




Date: May 8, 2001


By: /s/ J. Morton Davis
   -------------------------------
    J. Morton Davis






Date: May 8, 2001
      D.H. Blair Investment Banking Corp.




By:  /s/ David Nachamie
   -------------------------------
     David Nachamie
     Treasurer