1 EXHIBIT 10.21 SIGNAL PHARMACEUTICALS CONSULTING AGREEMENT This CONSULTING AGREEMENT (the "Agreement") is made as of April 1, 1996 (the "Effective Date") by and between Signal Pharmaceuticals, Inc., a California corporation (the "Company"), and John...Signal Pharmaceuticals Consulting Agreement • February 18th, 2000 • Signal Pharmaceuticals Inc • Services-commercial physical & biological research • California
