EXHIBIT A
AGREEMENT
JOINT FILING OF SCHEDULE 13G
The undersigned hereby agrees 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 Biotransplant, Inc.and hereby
affirm that such Schedule 13G is being filed on behalf of each of the
undersigned.
PARAMOUNT CAPITAL ASSET MANAGEMENT, INC.
Dated: June 7, 2000
New York, NY By /s/ Lindsay A. Rosenwald, M.D.
---------------------------------
Name: Lindsay A. Rosenwald, M.D.
Title: Chairman
ARIES DOMESTIC FUND, L.P.
By Paramount Capital Asset Management, Inc.,
General Partner
Dated: June 7, 2000
New York, NY By /s/ Lindsay A. Rosenwald, M.D.
---------------------------------
Name: Lindsay A. Rosenwald, M.D.
Title: Chairman
ARIES DOMESTIC FUND, II L.P.
By Paramount Capital Asset Management, Inc.,
General Partner
Dated: June 7, 2000
New York, NY By /s/ Lindsay A. Rosenwald, M.D.
---------------------------------
Name: Lindsay A. Rosenwald, M.D.
Title: Chairman
THE ARIES MASTER FUND
By Paramount Capital Asset Management, Inc.
Investment Manager
Dated: June 7, 2000
New York, NY By /s/ Lindsay A. Rosenwald, M.D.
---------------------------------
Name: Lindsay A. Rosenwald, M.D.
Title:Chairman
Dated: June 7, 2000
New York, NY By /s/ Lindsay A. Rosenwald, M.D.
---------------------------------
Name: Lindsay A. Rosenwald, M.D.
Title: Chairman
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