1. From the Center for Vascular Biology Research (M.R.A., R.J.N., K.C.S., W.C.A.), Department of Medicine and Division of Molecular and Vascular Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Mass; the Research Center for Advanced Science and Technology (T.M.), University of Tokyo, Japan; the Department of Pathology (D.L., S.-C.S.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Mass.