1. Cancer Center, The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, California 92037, Molsoft L.L.C., 3366 North Torrey Pines Court, Suite 300, La Jolla, California 92037, Retinoid Program, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, College of Pharmacy, Oregon State University, Corvallis, Oregon 97331, and The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037