1. Gibson, F., Doy, C. H., and Segall, S. B., Nature, 181, 549 (1958).
2. Doy, C. H., and Gibson, F. W., Biochem. J., 72, 586 (1959).
3. Smith, O. H., and Yanofsky, C., J. Biol. Chem., 235, 2051 (1960).
4. Doy, C. H., Nature, 189, 461 (1961).
5. Smith, O. H., and Yanofsky, C., in Methods in Enzymology, edit. by Colowick, S. P., and Kaplan, N. O., 6, 591 (Academic Press, New York and London, 1963).