Abstract
Cells of sea urchin hatching blastulae and gastrulae when reaggregated together do not influence each other with respect to the rate of rRNA synthesis. Extracts from unfertilized eggs and embryos inhibited rRNA synthesis by gastrulae. However, the inhibition was equally strong with extracts from stages that have a low rate of rRNA synthesis (eggs, cleavage embryos) as with extracts from stages that have a high rate of rRNA synthesis (oocytes, gastrulae). Synthesis of ppGpp is not detected at any of the investigated developmental stages.
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