1. From the Cerebral Microcirculation Section, Laboratory of Functional and Molecular Imaging (S.-H.C., A.A., C.C.-C.Y., A.C.S.); National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD (Y.M., J.H.); and College of Veterinary Medicine, Chungbuk National University, Cheongju, Korea (B.K.).