1. Ames, B. N. and Du bin, D. T. (1960)J. Biol Chem.,235, 769.
2. Bessey, O. A., Lowry, O. H. and Brock, M. T. (1946)J. Biol. Chem.,164, 321.
3. Borowsky. S. A., Perlow, V. W., Baroana, E. and Lieber, C. S. (1976)Gastroentrology,70, 978.
4. Handel, E. V. and Zelversmit, D. B. (1957)J. Lab. Clin. Med.,50, 152.
5. Hirayama, C, Nosaka, Y., Yamada, S. and Yamanishi, Y. (1979)Res. Commun. Chem. Pathol. Pharmacol.,26, 563.