1. Department of Pathology, Osaka City University Graduate School of Medicine, 1-4-3 Asahi-machi, Abeno-ku, Osaka 545-8585, Japan
2. DIMS Institute of Medical Science, Inc., 64 Goura, Nishiazai, Azai-cho, Ichinomiya 491-0113, Japan
3. Department of Experimental Pathology and Tumor Biology, Nagoya City, University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan
4. Japan Bioassay Research Center, 2445 Hirosawa, Hadano, Kanagawa 257-0015, Japan