1. Boyland, E., and Rhoden, Eva, Biochem. J., 44, 528 (1949).
2. Kaye, C., Cancer Res., 20, 237 (1960).
3. Hakim, S. M. A., thesis, Univ. Bombay (1957).
4. Rosen, G., and Ogur, M., Arch. Biochem., 25, 262 (1950).
5. Ceriotti, G., J. Biol. Chem., 198, 297 (1952).