1. From the Myocardial Biology Unit and Cardiovascular Section, Boston Medical Center, Boston Veterans Affairs Medical Center and Boston University School of Medicine (N.A.T., Z.X., C.C., F.S., S.N., J.W., D.B.S., O.H.L.B., C.S.A., W.S.C., K.S.), Boston, Mass; the Maine Medical Research Center (L.L.), South Portland, Maine; and Bates College (A.W.J.), Lewiston, Maine.