Abstract
AbstractThe increase in polysomal material in sea urchin zygotes after fertilization occurs primarily as an increase in the number rather than in the sizes of the polysomes. This suggests that the protein synthesis system in eggs is messenger RNA limited and that polysomes form at fertilization as a result of the messenger RNA becoming available. While these findings do not rule out the possibility that the peptide initiation step is less efficient in eggs than in embryos, they do suggest that this step is not the principal cause of the inactivity of the protein synthesis system in eggs.
Published Version
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