1. Dorothy M. Davis Heart and Lung Research Institute and Department of Physiology and Cell Biology, College of Medicine and Wexner Medical Center (M.J.M., H.L.H., P.B., P.V., K.I.S., L.E.W.), the Ohio State University, Columbus.
2. Division of Cardiac Surgery, Department of Surgery, College of Medicine (L.E.W.), the Ohio State University, Columbus.