1. Laboratory of Experimental Animal Science (N.S., Y.H., A.N., S.O., A.A., T.A.), Graduate School of Veterinary Medicine, Hokkaido University, Kita-ku, Sapporo 060-0818, Japan
2. Center for Experimental Animal Science (M.D., J.-M.C., T.M., I.M.), Nagoya City University Medical School, Mizuho-ku, Nagoya 467-8601, Japan