1. From the Department of Neurology (M.I., H.T., H.S.), the Horizontal Medical Research Organization (M.I.), the Department of Nuclear Medicine and Diagnostic Radiology (K.I., T.M., J.K.), and the Human Brain Research Center (H.Y., N.S., M.I., T.D., K.H., H.S., H.F.), Kyoto University Graduate School of Medicine, Shogoin, Sakyo, Kyoto, Japan; National Institute of Neurological Disorders and Stroke (H.S.), National Institutes of Health, Bethesda, Md.