1. From the Department of Biomedical Sciences, Cornell University, Ithaca, NY (H.E.L., R.L.D.); Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, GA (D.S., P.J.M.); Department of Cell and Developmental Biology, Weill Cornell Medical College, New York, NY (R.L.D.); and the Divisions of Clinical Pharmacology and Cardiology, Department of Internal Medicine, Vanderbilt University, Nashville, TN (D.G.H.).