Yuji Naito1,2, Tomohisa Takagi1, Ryo Inoue3. 1. Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine. 2. Department of Endoscopy and Ultrasound Medicine, University Hospital, Kyoto Prefectural University of Medicine. 3. Laboratory of Animal Science, Kyoto Prefectural University.