1. Division of Molecular and Life Sciences, Postech Biotech Center, Pohang University of Science & Technology, San 31 Hyoja-dong, Pohang 790-784, Korea
2. Department of Microbiology and Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, 134 Shinchon-dong, Seoul 120-752, Korea
3. Research Laboratories, Dong-A Pham. Co., Ltd., Yongin-si, Kyunggi-do 449-900, Korea
4. The International Vaccine Institute, Seoul 151-600, Korea