1. From the Division of Cardiology (D.L.B., Y.J., T.R., E.L., A.B., B.H., R.W., M.P.) and Department of Pharmacology and Cell Biophysics (I.L.G., G.G.), University of Cincinnati College of Medicine, Cincinnati, Ohio, and Section of Molecular and Cellular Cardiology (K.H., E.M.), The John Hopkins University, Baltimore, Md.