1. From the Neuroprotection Research Laboratory, Departments of Neurology and Radiology (X.W., J.L., H.Z., E.T., K.T., Y.M., E.H.L.), Massachusetts General Hospital and the Program in Neuroscience, Harvard Medical School, Boston, Mass; the Cardiovascular Research Center (D.N.A., P.L.H.), Massachusetts General Hospital, Harvard Medical School, Boston, Mass; and the Department of Molecular Neurobiology (C.Z.), Beijing Institute of Radiation Medicine, Beijing, China.