Abstract:Blastula cell surface membranes of the sea urchin, Strongylocentrotus purpuratus, were isolated on polycationic beads by a method modified from Jacobson and Branton (1977) and Jacobson (1980). This study represents the first application of this procedure to an embryonic system. Embryo cells were attached to polylysine-coated polyacrylamide beads and lysed, leaving the embryo cell surface membranes still attached to the beads, and cytoplasmic particles were washed free of the exposed inner surfaces of the membr… Show more
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