1. Wilson, E. B., 1925, The Cell in Development and Heredity, Macmillan, New York.
2. Gurdon, J. B., Mohun, T. J., Fairman, S., Brennan, S., 1985, Proc. Natl. Acad. Sci. U.S.A. 82: 139.
3. Smith, L. D., 1966, Dev. Biol. 14: 330.
4. Scharf, S. R., Gerhart, J. C., 1983, Dev. Biol. 99: 75.
5. Davidson, E. H., 1976, Gene Activity in Early Development, 2nd ed., Academic Press, New York.