1. Pastan, I. H., Johnson, G. S., and Anderson, W. B., A. Rev. Biochem., 44, 491–522 (1975).
2. Chlapowski, F. J., Kelly, L. A., and Butcher, R. W., in Advances in Cyclic Nucleotide Research, 6 (edit. by Greengard, D. P., and Robison, G. A.), 245–338 (Raven New York, 1975).
3. Butcher, F. R., Scott, D. F., Potter, V. R., and Morris, H. P., Cancer Res. 32, 2135–2140 (1972).
4. Boyd, H., Louis, C. J., and Martin, T. J., Cancer Res., 34, 1720–1725 (1974).
5. Chayoth, R., Epstein, S. M., and Field, J. B., Cancer Res., 33, 1970–1974 (1973).