1. Department of Life Science and Division of Molecular and Life Sciences, Pohang University of Science and Technology (C.H.B., C.-B.C.), Pohang 790-784, South Korea
2. Center for Neurologic Disease, Harvard Institute of Medicine, Brigham and Women’s Hospital and Harvard Medical School (J.Y.P.), Boston, Massachusetts 02215;
3. Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine (T.A.), Kyoto 606-8507, Japan