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- W2007527706 abstract "The tendency of mammalian sperm-egg fusion to occur at a site away from the first polar body was investigated in a homologous (mouse oocytes and mouse spermatozoa) and in a heterologous model (hamster oocytes and mouse spermatozoa). Following micromanipulation of the zona pellucida either in proximity to or opposite the first polar body, in vitro fertilization was performed and subsequent differences in sperm-egg interaction were evaluated. Since spermatozoa from random-bred mice do not readily penetrate intact zonae pellucidae in vitro, it is likely that zona penetration occurred through the artificial holes in both models. The creation of a gap in the zona pellucida opposite the first polar body was associated with levels of sperm fusion that were significantly higher than those resulting from manipulation near the first polar body. Spermatozoa were rarely found to penetrate the hole completely, and in general few spermatozoa were observed in the perivitelline space. The proximity between pronuclei following sperm penetration was correlated with the position of the incision with respect to the polar body. The findings suggest that breaching the zona pellucida for microsurgical fertilization should be performed away from the microvillus-free area of the oocyte." @default.
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- W2007527706 date "1991-02-01" @default.
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- W2007527706 title "A preferential site for sperm-egg fusion in mammals" @default.
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- W2007527706 doi "https://doi.org/10.1002/mrd.1080280212" @default.
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