1. Department of Molecular Medicine, School of Medicine, Ewha Womans University, Seoul 158-710, Republic of Korea
2. Institute of Pharmaceutical Research and Development, College of Pharmacy, Wonkwang University, Iksan 570-749, Republic of Korea
3. Department of Pharmacology, School of Medicine, Eulji University, Daejeon 301-768, Republic of Korea
4. Biosafety Research Institute and College of Veterinary Medicine, Chonbuk National University, Jeonju 561-756, Republic of Korea
5. Department of Biology, College of Natural Sciences, Chungbuk National University, Cheongju 362-763, Republic of Korea