1. From the Cardiology Division (C.G.T., M.A.A., B.O’R., D.A.K., N.P.) and Division of Anesthesiology and Critical Care Medicine (W.D.G.), Johns Hopkins Medical Institutions, Baltimore, Md; Cardiovascular Sciences Laboratory (W.W., H.C.), National Institute of Aging, NIH, Baltimore, Md; Department of Biochemistry & Molecular Biology (J.P.F., G.M.W.), University of Maryland, Baltimore; Department of Physiology (S.H., D.M.B.), Loyola University Chicago, Maywood, Ill; Dulbecco Telethon Institute (G.D...