1. From the Departments of Physiology & Biophysics (M.F.N., M.N.-C., G.C.A., C.Y., V.S.V., L.F.S.) and Pharmacology (G.S.M.), University of Washington, Seattle; and Medical Biotechnology Center (W.J.L.), University of Maryland Biotechnology Institute, Baltimore. G.C. Amberg is currently with the Department of Biomedical Sciences, Colorado State University, Fort Collins.