Abstract
A low level of general ribosomal protein synthesis occurs during embryonic cleavage of Strongylocentrotus purpuratus. Wide differences in specific activities indicate that the synthesis or turnover of individual ribosomal proteins occurs at different rates and is not coordinated with respect to each other. In general, proteins with the greatest specific radioactivities are those in the higher molecular weight range. Experiments with actinomycin D indicate that the production of most of the ribosomal proteins is not coordinated with that of rRNA, and probably occurs on maternal mRNAs.
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