1. Discovery Medicinal Chemistry, Searle, Monsanto, 4901 Searle Parkway, Skokie, Illinois 60077, Discovery Pharmacology, Searle, Monsanto, 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, and Physical Methodology, Searle, Monsanto, 4901 Searle Parkway, Skokie, Illinois 60077