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• W1967459898 abstract "Changes in sperm nuclei incorporated into starfish, Asterina miniata, eggs inseminated at different stages of meiosis have been correlated with the progression of meiotic maturation. A single, uniform rate of sperm expansion characterized eggs inseminated at the completion of meiosis. In oocytes inseminated at metaphase I and II the sperm nucleus underwent an initial expansion at a rate comparable to that seen in eggs inseminated at the pronuclear stage. However, in oocytes inseminated at metaphase I, the sperm nucleus ceased expanding by meiosis II and condensed into chromosomes which persisted until the completion of meiotic maturation. Concomitant with the formation and expansion of the female pronucleus, sperm chromatin of oocytes inseminated at metaphase I enlarged and developed into male pronuclei. Condensation of the initially expanded sperm nucleus in oocytes inseminated at metaphase II was not observed. Instead, the enlarged sperm nucleus underwent a dramatic increase in expansion commensurate with that taking place with the maternal chromatin to form a female pronucleus. Fusion of the relatively large female pronucleus and a much smaller male pronucleus was observed in eggs fertilized at the completion of meiotic maturation. In oocytes inseminated at metaphase I and II, the male and female pronuclei, which were similar in size, migrated into juxtaposition, and as separate structures underwent prophase. The chromosomes in each pronucleus condensed, intermixed, and became aligned on the metaphase palate of the mitotic spindle in preparation for the first cleavage division. These observations demonstrate that the time of insemination with respect to the stage of meiotic maturation has a significant effect on sperm nuclear transformations and pronuclear morphogenesis." @default.
• W1967459898 created "2016-06-24" @default.
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• W1967459898 date "1991-09-01" @default.
• W1967459898 modified "2023-09-26" @default.
• W1967459898 title "Pronuclear formation in starfish eggs inseminated at different stages of meiotic maturation: Correlation of sperm nuclear transformations and activity of the maternal chromatin" @default.
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• W1967459898 doi "https://doi.org/10.1016/s0012-1606(05)80007-7" @default.
• W1967459898 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1879616" @default.
• W1967459898 hasPublicationYear "1991" @default.
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