1. Department of Oriental Medicinal Material and Processing, College of Life Science, Kyung Hee University, 1 Seocheon-dong, Kiheung-gu Yongin, Kyunggi-do 449-701, South Korea
2. Environmental and Molecular Microbiology Laboratory, Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea
3. Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA