Abstract
Acrylamide gel electrophoretic studies were carried out on basic protein extracts of developmental stages of the frog Rana pipiens, the salamander Ambystoma punctatum, and the sea urchin Arbacia punctulata. Qualitative changes were detected in early cleavage and during gastrulation in all three species. Exogastrulation experiments indicate that those proteins appearing during normal gastrulation are absent in exogastrulae. The results are discussed in relation to the findings of previous investigators.
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