1. Albers, R. W., Koval, G. J., and Siegal, G. J., Mol. Pharmacol., 4, 324 (1968).
2. Schwartz, A., Matsui, H., and Laughter, A. H., Science, 159, 323 (1968).
3. Dodge, J. T., Mitchell, C., and Hanahan, D. J., Arch. Biochem. Biophys., 100, 119 (1963).
4. Weil-Malherbe, H., and Green, R. H., Biochem. J., 49, 286 (1951).
5. Dutta, S., Goswami, S., Datta, D. K., Lindower, J. O., and Marks, B. H., J. Pharmacol. Exp. Therap., 164, 10 (1968).