1. Gal, E. M., and Razevska, D. E., Arch. Biochem. Biophys., 89, 253 (1960).
2. Acker, D. S., and Wayne, W. J., J. Amer. Chem. Soc., 79, 6483 (1957).
3. Kline, O. L., Tolle, C. D., and Nelson, E. M., J. Assoc. Agric. Chemists, 24, 147 (1938).
4. Banhidi, Z. G., Acta Physiol. Scand., 50, suppl. 174 (1960).