1. Axelrod, J., Harvey Lect., 67, 175 (1973).
2. Iversen, L. L., in Biochemistry of simple neuronal models (edit. by Costa, E., and Giacobini, E.) 109 (Raven Press, New York, 1970).
3. Snyder, S. H., Kuhar, M. J., Green, A. I., Coyle, J. T., and Shaskan, E. G., Int. Rev. neurobiol., 13, 127 (1970).
4. Iversen, L. L., and Johnston, G. A. R., J. Neurochem., 18, 1939 (1971).
5. Johnston, G. A. R., and Iversen, L. L., J. Neurochem., 18, 1951 (1971).