1. From the Department of Biochemistry and Molecular Biology (L.R.S., J.R., B.D.C., M.L.G.) and Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine (J.R., K.-Y.C., J.L., L.A.J., M.M.G., C.S.W., M.L.G.), University of Florida, Gainesville, FL; North Florida/South Georgia Veterans Health Administration (J.L., C.S.W., M.L.G.), Gainesville, FL; current address (L.R.S.): SABiosciences, Frederick, MD; (M.M.G.): Department of Physiology, Emory University, Atlanta, GA.