1. Bonner, W. D., and Ito, T., Fed. Proc., 19, 35 (1960).
2. Hackett, D. P., Rice, B., and Schmid, C., J. Biol. Chem., 235, 2140 (1960).
3. IUB-IUBS Symp. on Biol. Structure and Function, Stockholm (Academic Press, New York, in the press).
4. Laties, G. G., Plant Physiol., 28, 557 (1953).
5. Chance, B., in Methods in Enzymology, edit. by Colowick, S. P., and Kaplan, N. O., 4, 273 (Academic Press, Inc., New York, 1957).