1. Department of Biochemistry (N.U., N.T., K.I., Y.U., T.S., T.S.), School of Dentistry, Showa University, Tokyo, 142-8555
2. Snow Brand Milk Products Company (H.Y., A.M., K.H.), Tochigi, 329-0512, Japan
3. St. Vincent’s Institute of Medical Research (M.T.G., T.J.M.), Fitzroy, Victoria 3065, Australia