1. Department of Oriental Medicinal Material and Processing, College of Life Science, Kyung Hee University, 1 Seocheon-dong, Giheung-gu Yongin, Kyunggi-do 449-701, South Korea
2. Kanwon National University, School of Bioscience and Biotechnology, Chunchon 200-701, South Korea
3. Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA