1. From the Departments of Physiology (R.A.G.-V., R.S., D.M.S., L.C.S.-P., A.K., H.K., G.L.G.N.) and Cardiology (L.C.S.-P.) and Hypertension and Renal Center of Excellence (R.A.G.-V., R.S., D.M.S., A.K., H.K., G.L.G.N.), Tulane University Health Sciences Center, New Orleans, La.