1. Department of Pharmacology, Chonbuk National University Medical School, Jeonju 561-756, Korea.
2. Department of Veterinary Physiology, College of Veterinary Medicine and School of Agricultural Biotechnology, Seoul National University, Seoul 151-742, Korea.
3. Department of Plastic Surgery, College of Medicine, Seoul National University, Seoul 110-744, Korea.
4. R&D Center, Daewoong Pharmaceutical Company, Yongin 449-814, Korea.
5. Department of Agricultural Biology, National Institute of Agricultural Science and Technology, Suwon 441-100, Korea.
6. School of Biological Resources and Materials Engineering, College of Agriculture and Life Sciences, Seoul National University, Seoul 151-742, Korea.