1. Department of Herbal Resources Research, Korea Institute of Oriental Medicine, Daejeon 305-811, Republic of Korea
2. School of Medicine and Applied Radiological Science Research Institute, Jeju National University, Jeju-si 690-756, Republic of Korea
3. Laboratory of Molecular Biochemistry, Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea
4. Division of Radiation Effect, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, Republic of Korea
5. Department of Neuroscience, College of Medicine, Ewha Womans University, Seoul 110-783, Republic of Korea
6. Department of Microbial Chemistry and College of Pharmacy, Kyung Hee University, Seoul 130-701, Republic of Korea