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