1. Department of Bioscience and Biotechnology, Reverse Metabolomics Research Center, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea
2. Neuro-Medicine Center, Life/Health Division, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Korea