1. Departments of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan
2. Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
3. Research Institute of Natural Sciences, Okayama University of Science, Okayama 700-0005, Japan
4. Department of Biochemistry, Osaka Medical Centre for Cancer and Cardiovascular Diseases, Higashinari-ku, Osaka 537-8511, Japan
5. Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical Sciences, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan