1. Hungate, R. E., “Biochemistry and Physiology of Protozoa”, 2, edit. by Hutner, S. M., and Lwoff, A. (Academic Press, New York,1955).
2. Oxford, A. E., Parasitol. Rev., 4, 569 (1955).
3. Gutierrez, J., Biochem. J., 60, 516 (1955).
4. Becker, E. R., Schulz, J. A., and Emmerson, M. A., Iowa State Coll. J. Sci., 4, 215 (1930).
5. Heald, P. J., Oxford, A. E., and Sugden, B., Nature, 169, 1055 (1952).