* Research carried out at Brookhaven National Laboratory under the auspices of the U.S. Atomic Energy Commission. 1 Tissibres, A., J. D. Watson, D. Schlessinger, and B. R. Hollingworth, J. Mol. Biol., 1, 221 (1959). 2 Zubay, G., in Recent Progress in Microbiology (Montreal: University of Toronto Press, 1962), p. 65. 3 Gilbert, W., J. Mol. Biol., 6, 374 (1963). 4 Nirenberg, M. W., and J. H. Matt...
