1. Age-Related and Brain Diseases Research Center (J.Y.L., H.Y.C., T.Y.Y.), School of Medicine, Kyung Hee University, Seoul, 130-701, Korea
2. Department of Life Science (W.H.N., B.G.J.), Sogang University, Seoul 121-742, Korea
3. Department of Biochemistry and Molecular Biology (T.Y.Y.), School of Medicine, Kyung Hee University, Seoul, 130-701, Korea