1. Department of Biological Science, College of Natural Sciences, Biotechnology Institute, Wonkwang University, Iksan 570-749, Korea.
2. Department of Animal Resources, College of Life and Environmental Sciences, Daegu University, Gyeongsan 712-714, Korea.
3. National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology, Ochang 363-883, Korea.