1. Lauffer, M. A., J. Amer. Chem. Soc., 65, 1793 (1943).
2. Plummer, D. T., Wilkinson, J. H., and Withycombe, W. A., Biochem. J., 89 (1963).
3. Brody, I. A., Nature, 201, 685 (1964).
4. Appella, E., and Markert, C. L., Biochem. Biophys. Res. Comm., 6, 171 (1943).
5. Kaplan, N. O., and Goodfriend, T. L., in Advances in Enzyme Regulation, edit. by Weber, G., 2, 203 (Pergamon Press, Oxford, 1964).