Affiliation: | (1) Research Laboratories of Dona-A Pharm. Co., Ltd., Yongin-Si, Kyunggi-Do, 449-900, Korea;(2) Department of Life Science, Sogang University, Seoul, 121-742, Korea;(3) Korea Research Institute of Bioscience and Biotechnology, Taejon, 305-600, Korea;(4) Graduate School of Biotechnology, Korea University, Seoul, 136-701, Korea |