1. Braunstein, A. E., and Shemyakin, M. M., Biokhimia, 18, 393 (1953).
2. Metzler, D. E., Ikawa, M., and Snell, E. E., J. Amer. Chem. Soc., 26, 648 (1954).
3. Huges, R. C., Jenkins, W. T., and Fisher, E. H., Proc. U.S. Nat. Acad. Sci., 48, 1615 (1962).
4. Sizer, J. W., and Jenkins, W. T., in Chemical and Biological Aspects of Pyridoxal Catalysis, 126 (Pergamon Press, Oxford, 1963).
5. Snell, E. E., Vitamins and Hormones, 16, 77 (1958).