1. W. M. Keck Foundation Center for Integrative Neuroscience (B.K.T., M.A.P., A.I.B.), University of California, San Francisco, San Francisco, California 94143-0452
2. Departments of Anatomy (B.K.T., M.A.P., A.I.B.), University of California, San Francisco, San Francisco, California 94143-0452
3. Physiology (S.F.A., M.F.D., A.I.B.), University of California, San Francisco, San Francisco, California 94143-0452