1. From the Division of Cardiology (P.J.M., S.R.T., H.E.L., L.A.M., D.G.H.), Department of Pharmacology (F.J.G.), and Lowance Center for Immunology (C.W.), Emory University School of Medicine, Atlanta, Ga; Atlanta Veterans Administration Hospital (D.G.H.), Decatur, Ga; and Department of Medicine, Jagiellonian University School of Medicine (T.J.G.), Cracow, Poland.