1. Robison, G. A., Butcher, R. W., and Sutherland, F. W., Cyclic AMP, 98 (Academic Press, New York, 1971).
2. Payne, J. W., and Gilvarg, C., Advances in Enzymology, 35, 187 (1971).
3. Fickel, T. E., and Gilvarg, C., J. Org. Chem. (in the press).
4. Schnabel, E., Klostermeyer, H., and Berndt, H., Ann. Chem., 749, 90 (1971).
5. Torriani, A., and Rothman, F., J. Bact., 81, 835 (1961).