Changing populations of messenger RNA during sea urchin development.

Abstract

Experiments on the binding of RNA to DNA and competition in this binding by RNA''s from various developmental stages have shown: messenger RNA is present in unfertilized eggs of Strongylocentrotus purpuratus; some of these kinds of molecules of mRNA continue to be synthesized as late as the prism stage; mRNA from unfertilized eggs and blastulae were not distinguished; adult tissues share some of the same molecules with prism embryos; and other molecules, assembled at the prism stage, are much less abundant or absent at both earlier and later stages of development.