1. Center for Cooperative Research, Medical Division, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma 371-8511, Japan, Department of Biochemistry, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, Texas, 78229-3900, Wako-kagaku Co., 3-2-3 Tonya-machi, Takasaki, Gunma 370-0006, Japan, and Research Division for Assessment of Complementary Medicine (NPO), 3-10-3 Ton-ya machi (6F-610), Takasaki, Gunma 370-0006, Japan