1. Research and Development Center, Nongshim Company, Ltd., Gunpo 435-030, South Korea; Department of Food and Nutrition, University of Ulsan, Ulsan 680-749, South Korea; Institute and Department of Genetic Engineering, Kyung Hee University, Suwon 449-701, South Korea; Institute of Asan Life Science Research Center, Seoul 138-736, South Korea; and Department of Food Science and Technology, School of Agricultural Biotechnology, Seoul National University, Suwon 441-744, South Korea