1. Suda, M., Hayaishi, O., and Oda, Y., Symp. Enzyme Chem. (Tokyo), 1, 79 (1949); Med. J. Osaka Univ., 2, 21 (1950).
2. Stanier, R. Y., and Tsuchida, M., J. Bact., 58, 45 (1949).
3. Stanier, R. Y., and Hayaishi, O., Science, 114, 326 (1951).
4. Knox, W. E., in Symp. Tryptophan Metabolism, Amer. Chem. Soc., Div. Med. Chem., 137th Meeting, Atlantic City, N.J., Sept. 1959, The Enzymes of Tryptophan Degradation, 28.
5. Dagley, S., Evans, W. C., and Ribbons, D. W., Nature, 188, 560 (1960).