1. Ruddle, F. H., in Park City International Symposia on Problems in Biology I. RNA in Development (edit. by Hanley, W.) (in the press).
2. Ruddle, F. H., Symp. of the Intern. Soc. Cell Biol. (Academic Press, in the press).
3. Nabholz, M., Miggiano, V., and Bodmer, W., Nature, 223, 358 (1969).
4. Boone, C., and Ruddle, F. H., Biochem. Genet., 3, 119 (1969).
5. Shows, T. B., and Ruddle, F. H., Proc. US Nat. Acad. Sci., 614, 574 (1968).