1. From Institute for Animal Experimentation (Y.C., X.X., T.Y., K.M.), Nagoya City University Medical School, Nagoya 467, Japan
2. University of Tokushima School of Medicine, Tokushima 770, and Institute for Experimental Animal Science (G.-J.S., Y.M., T.A.), Nagoya City University Medical School, Nagoya 467, Japan
3. Second Department of Pathology (H.U.), Nagoya City University Medical School, Nagoya 467, Japan