1. Department of Pharmacology, College of Medicine, Kangwon National University, Chuncheon 200-701, Korea.
2. Department of Laboratory Animal Resources, National Institute of Food and Drug Evaluation, Korea FDA, Cheongwon 363-951, Korea.
3. Department of Agricultural Biotechnology, Seoul National University, Seoul 151-742, Korea.
4. College of Pharmacy, Kangwon National University, Chuncheon 200-701, Korea.