1. Department of Applied Animal Science (M.S., Y.Yan., T.O., Y.Yam.), Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima 739-8528, Japan;
2. Department of Internal Medicine (V.S.), University of Texas Medical Branch, Galveston, Texas 77555;
3. Department of Neurosciences (M.C.W.), University of New Mexico Health Sciences Center, Albuquerque, New Mexico 87131
4. Department of Molecular and Cellular Biology (M.S., J.S.R.), Baylor College of Medicine, Houston, Texas 77030;