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- W1983877631 abstract "Electron microscopic and cytochemical investigations were carried out on inseminated Arbacia oocytes comparing structural and chemical properties of their microvillous surface and fertilization cones. Early fertilization cones (up to 4 min postinsemination) were relatively small, smooth surface projections of cytoplasm that engulfed the incorporated sperm nucleus. However, in contrast to surrounding microvillous areas of the oocyte surface, enlarged fertilization cones (8 to 15 min postinsemination) had a distinctive crenated appearance that persisted until their regression. When examined by various cytochemical techniques, membrane delimiting fertilization cones had a much lower affinity for agents that stain negatively charged and carbohydrate moieties (cationized ferritin, concanavalin A, ruthenium red, and alcian blue) than did other regions of the oocyte surface. This difference in surface properties of membrane delimiting the site of sperm-egg fusion was not due solely to incorporated sperm plasma membrane and did not occur when inseminated oocytes were incubated with cytochalasin B. Little or no difference in the membrane of the fertilization cone versus microvillous areas was observed when inseminated eggs were freeze-fractured or prepared with agents (filipin and polymixin B) to demonstrate β-hydroxysterols and anionic phospholipids. These observations indicate that membrane delimiting the fertilization cone differs from the remainder of the oocyte surface and suggests that following insemination significant rearrangements of surface molecules take place within the egg plasmalemma that give rise to asymmetries in membrane topography." @default.
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- W1983877631 date "1986-10-01" @default.
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- W1983877631 title "Fertilization cones of inseminated sea urchin (Arbacia punctulata) oocytes: Development of an asymmetry in plasma membrane topography" @default.
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- W1983877631 doi "https://doi.org/10.1002/mrd.1120150205" @default.
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