1. Torrey Pines Institute for Molecular Studies, 3550 General Atomics Court, San Diego, California 92121, California State University, 5241 North Maple Avenue, Fresno, California 93740-8027, University of Arizona College of Pharmacy Tucson, Arizona 85721-0207, and The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, California 92037