1. School of Life Sciences and Biotechnology, Korea University, Seoul 136-071, South Korea; Team for Radiation Food Science and Biotechnology, Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-353, South Korea; Department of Food and Nutrition, Chungnam National University, Daejeon 305-764, South Korea; and Department of Oriental Medical Food and Nutrition, Asia University, Kyungsan, Kyungbuk 712-220, South Korea