1. Adelstein, F. J., Baldwin, C., Kohn, H. I.: Develop. Biol.26, 537 (1971).
2. Crombrugghe, B. de, Chen, B., Anderson, W., Nissley, P., Gottesman, M., Pastan, J., Perlman, R. W.: Nature (Lond.) (New Biol.)231, 139 (1971).
3. Duafala, T.: Lawrence Radiation Laboratory Report UCRL-50571, p. 31.
4. Marsh, I., Perry, S.: J. clin. Invest.43, 267 (1964).
5. Pastan, I. H.: Current directions in research on cyclic AMP. In: Current topics in biochemistry (Anfinsen, C. B., Goldberger, R. F., Schechter, A. N., eds.). New York-London: Academic Press 1972.