1. Department of Food and Nutrition and Research Institute of Biotechnology, Hung Kuang University, No. 34, Chung-Chie Road, Shalu County, Taichung 433, Taiwan, Research Institute of Medical Sciences, Department of Urology, Taipei Medical University Hospital, Taipei 110, Taiwan, and Institute of Biotechnology, National Tsing Hua University, No. 101, Section 2 Kuang-Fu Road, Hsinchu 300, Taiwan