EX-99 3 valentis_jtflagmt121701.txt EXHIBIT A - JOINT FILING AGREEMENT 18 of 20 Pages EXHIBIT A JOINT FILING AGREEMENT The undersigned hereby agree that the statement on Schedule 13G with respect to the Common Stock of Valentis, Inc., dated as of December 27, 2001, is, and any amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934. Date: December 27, 2001 PERSEUS-SOROS BIOPHARMACEUTICAL FUND, LP By: Perseus-Soros Partners, LLC General Partner By: SFM Participation, L. P. Managing Member By: SFM AH, Inc. General Partner By: /s/ Richard D. Holahan, Jr. ----------------------------------- Name: Richard D. Holahan, Jr. Title: Secretary Date: December 27, 2001 PERSEUS-SOROS PARTNERS, LLC By: SFM Participation, L. P. Managing Member By: SFM AH, Inc. General Partner By: /s/ Richard D. Holahan, Jr. ----------------------------------- Name: Richard D. Holahan, Jr. Title: Secretary Date: December 27, 2001 PERSEUS BIOTECH FUND PARTNERS, LLC By: Perseuspur, LLC Managing Member By: /s/ Rodd Macklin ----------------------------------- Name: Rodd Macklin Title: Secretary 19 of 20 Pages Date: December 27, 2001 PERSEUSPUR, LLC By: /s/ Rodd Macklin ------------------------------------ Name: Rodd Macklin Title: Secretary Date: December 27, 2001 MR. FRANK H. PEARL /s/ Frank H. Pearl -------------------------------------------- Name: Frank H. Pearl Date: December 27, 2001 SFM PARTICIPATION, L. P. By: SFM AH, Inc. General Partner By: /s/ Richard D. Holahan, Jr. ----------------------------------- Name: Richard D. Holahan, Jr. Title: Secretary Date: December 27, 2001 SFM AH, INC. By: /s/ Richard D. Holahan, Jr. ----------------------------------- Name: Richard D. Holahan, Jr. Title: Secretary Date: December 27, 2001 MR. GEORGE SOROS By: /s/ Richard D. Holahan, Jr. ----------------------------------- Name: Richard D. Holahan, Jr. Title: Attorney-in-Fact Date: December 27, 2001 SOROS FUND MANAGEMENT LLC By: /s/ Richard D. Holahan, Jr. ----------------------------------- Name: Richard D. Holahan, Jr. Title: Assistant General Counsel