1. Center for Molecular Biology and Cyotogenesis, SRL, Inc., Hino Tokyo 192-0002,1
2. Department of Microbiology, The Tokyo Metropolitan Institute of Medical Science,2 and
3. Division of Gastroenterology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama 227-8501,3 and
4. Liver Unit, The Tokyo Metropolitan Komagome Hospital,4Bunkyo-ku, Tokyo 113-8613,
5. Institute of Gastroenterology, Tokyo Women’s Medical College, Shinjiyuku-ku, Tokyo 162-0054,5 Japan