Abstract
Surface proteins solubilized with butanol from purified plasma membranes of sea urchin embryos at differ ent developmental stages were tested for their aggregation promoting activity on dissociated cells. Cells used for the assays were obtained either from blastulae or from embryos at the 16 cell stage. Results show that a strong enhancement of cell aggregation was produced only when extracted proteins and dissociated cells were obtained from embryos at the same developmental stage.
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