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- W2086749271 abstract "Abstract The role of cortical granules in the mouse egg's plasmalemma block to polyspermy was investigated by examining the effect of premature granule loss on egg fertility. Granule loss, quantitated by transmission electron microscopic examination, was induced in zona-free eggs by exposure to the divalent cation ionophore, A23187, or by mechanical removal of zonae. Egg exposure to ionophore led to the loss of approximately 50% of the egg's complement of granules in the absence of nuclear activation (parthenogenesis), while complete cortical granule loss accompanied the parthenogenetic activation seen in a limited population of mechanically stimulated eggs. Aged eggs underwent nuclear activation without a dramatic reduction in granule complements. The fertility of treated zona-free eggs was identical to that of controls, as measured by the percentage of eggs penetrated and by the mean number of sperm recovered per egg. Moreover, both ionophore-treated and aged eggs subsequently underwent a normal sperm-induced block response. Exposure of zona-intact eggs to ionophore was also without effect on egg fertility. These results indicate that cortical granules are not involved in the plasmalemma block to polyspermy in the mouse." @default.
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- W2086749271 date "1979-07-01" @default.
- W2086749271 modified "2023-10-17" @default.
- W2086749271 title "Premature cortical granule loss does not prevent sperm penetration of mouse eggs" @default.
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- W2086749271 doi "https://doi.org/10.1016/0012-1606(79)90079-4" @default.
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