REGENERON PHARMACEUTICALS, INC. (a New York corporation) 2,600,000 Shares of Common Stock PURCHASE AGREEMENT Dated: March 29, 2000 REGENERON PHARMACEUTICALS, INC. (a New York corporation) 2,600,000 Shares of Common Stock (Par Value $0.001 Per Share)...Regeneron Pharmaceuticals Inc • April 4th, 2000 • Pharmaceutical preparations • New York
