1. Laboratory Animal Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-860, Korea
2. Brain Disease Research Institute, Ewha Womans University, Seoul 120-750, Korea
3. Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul 120-750, Korea
4. Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea