Changing populations of messenger RNA during sea urchin development.

' Watson, J. D., and F. H. C. Crick, in Viruses, Cold Spring Harbor Symposia on Quantitative Biology, vol. 18 (1953), p. 123. 6Koch, A. L., and C. Miller, J. Theoret. Biol., 8, 71 (1964). 7 Fong, P., these PROCEEDINGS, 52, 641 (1964). 8 Dounce, A. L., J. Theoret. Biol., 2, 152 (1962). 9 Cavalieri, L. F., and B. J. Rosenberg, in Progress in Nucleic Acid Research, ed. J. N. Davidson and W. E. Cohn (New York: Academic Press, 1963), vol. 2, p. 1. 10Butler, J. A. V., Nature, 199, 68 (1963). 11 Lowdin, P. O., in Electronic Aspects of Biochemistry, ed. B. Pullman (New York: Academic Press, 1964), p. 167. 12Sibatani, A., and S. Hiai, J. Theoret. Biol., 7, 393 (1964). 13 Stonehill, E. H., J. Theoret. Biol., 9, 323 (1964). 14Jehle, H., these PROCEEDINGS, 53, 1451 (1965). 1r Shildkraut, C. L., C. R. Richardson, and A. Kornberg, J. Mol. Biol., 9, 24 (1964). 16Cairns, J., J. Mol. Biol., 6, 298 (1963). 17 Cairns, J., in Synthesis and Structure of Macromolecules, Cold Spring Harbor Symposia on Quantitative Biology, vol. 28 (1963), p. 43. 18 Bessman, M. J., I. R. Lehman, E. S. Simms, and A. Kornberg, J. Biol. Chem., 233, 171 (1958). 19 de Waard, A., A. V. Paul, and I. R. Lehman, these PROCEEDINGS, 54, 1241 (1965). 20 Speyer, J. F., Biochem. Biophys. Res. Commun., 21, 6 (1965). 21Monod, J., J. Wyman, and J. P. Changeux, J. Mol. Biol., 12, 88 (1965). 22Kornberg, A., Advan. Enzymol., 18, 191 (1957). 23 Baldwin, R. L., in The Bacteria, ed. I. C. Gunsalus and R. Y. Stanier (New York: Academic Press, 1964), p. 327.