1. Laboratories of Veterinary Pharmacology and Biochemistry, College of Veterinary Medicine, Seoul National University, Seoul 151-742, Korea.
2. Laboratory of Molecular Genetics, Institute for Molecular Biology and Genetics and Department of Microbiology, Seoul National University, Seoul 151-742, Korea.
3. Department of Physiology, Institute of Health Sciences and Medical Research Center for Neural Dysfunction, College of Medicine, Gyeongsang National University, Jinju 660-751, Korea.