1. Sinsheimer, R. L., and J. F. Koerner: J. biol. Ch. 198, 293 (1952).
2. Schmidt, G., and M. Laskowski sen.; in: Boyer-Lardy-Myrbäck, Enzymes, Bd. V. S. 3ff.
3. Eazzell, W. E., and H. G. Khorana: J. biol. Ch. 234, 2105, 2114 (1959).
4. Uzawa, T.: J. Biochem. 15, 19 (1932).
5. Takahashi, H.: J. Biochem. 16, 447, 463 (1932).