EXHIBIT 99.A ------------ AGREEMENT TO FILE JOINTLY We, the undersigned, hereby express our agreement that the attached Schedule 13G and all subsequent amendments thereto executed by both of us are filed on behalf of each of us. HOECHST MARION...Hoechst Marion Roussel Inc • April 1st, 1998 • Pharmaceutical preparations
14 EXHIBIT 99.C AGREEMENT TO FILE JOINTLY We, the undersigned, hereby express our agreement that the Schedule 13D to which this Agreement is appended is filed on behalf of each of us. HOECHST MARION ROUSSEL, INC. Date: March 28, 1997 By: /s/ James P....Hoechst Marion Roussel Inc • March 28th, 1997 • Pharmaceutical preparations
EXHIBIT 99.A ------------Hoechst Marion Roussel Inc • March 31st, 1998 • Pharmaceutical preparations
9 EXHIBIT 99.D AGREEMENT TO FILE JOINTLY We, the undersigned, hereby express our agreement that the Schedule 13D to which this Agreement is appended is filed on behalf of each of us. HOECHST MARION ROUSSEL, INC. Date: January 9, 1997 By: /s/ James P....Hoechst Marion Roussel Inc • January 9th, 1997 • Pharmaceutical preparations
11 EXHIBIT H AGREEMENT TO FILE JOINTLY We, the undersigned, hereby express our agreement that the attached Schedule 13D is filed on behalf of each of us.Hoechst Marion Roussel Inc • October 31st, 1996 • Pharmaceutical preparations
EXHIBIT 99. A ------------- AGREEMENT TO FILE JOINTLY We, the undersigned, hereby express our agreement that the attached Schedule 13G and all subsequent amendments thereto executed by both of us are filed on behalf of each of us. HOECHST MARION...Hoechst Marion Roussel Inc • April 1st, 1998 • Pharmaceutical preparations
EXHIBIT 99.A ------------ AGREEMENT TO FILE JOINTLY We, the undersigned, hereby express our agreement that the attached Schedule 13G and all subsequent amendments thereto executed by both of us are filed on behalf of each of us. HOECHST MARION...Hoechst Marion Roussel Inc • April 1st, 1998 • Pharmaceutical preparations
EXHIBIT 99.A ------------ AGREEMENT TO FILE JOINTLY We, the undersigned, hereby express our agreement that the attached Schedule 13G and all subsequent amendments thereto executed by both of us are filed on behalf of each of us. HOECHST MARION...Hoechst Marion Roussel Inc • April 1st, 1998 • Pharmaceutical preparations
9 EXHIBIT 99.C AGREEMENT TO FILE JOINTLY We, the undersigned, hereby express our agreement that the Schedule 13D to which this Agreement is appended is filed on behalf of each of us. HOECHST MARION ROUSSEL, INC. Date: January 9, 1997 By: /s/ James P....Hoechst Marion Roussel Inc • January 9th, 1997 • Pharmaceutical preparations
11 EXHIBIT 99.D AGREEMENT TO FILE JOINTLY We, the undersigned, hereby express our agreement that the attached Schedule 13D is filed on behalf of each of us. HOECHST CORPORATION Date: March 21, 1996 By: /s/ David A Jenkins David A. Jenkins Vice...Hoechst Marion Roussel Inc • March 22nd, 1996 • Pharmaceutical preparations
