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- W2023277563 abstract "Breakdown of the germinal vesicle in inseminated eggs of the surf clam, Spisula solidissima, consists of a vesiculation of its nuclear envelope and the condensation of its chromatin. Adjacent to the disrupting germinal vesicle, two asters develop, move to either side of the chromosomes, and form the first meiotic apparatus. The meiotic apparatus moves to one side of the zygote so that one aster is located at the cortex (peripheral aster) while the other is situated medially (inner aster). At anaphase the dyads separate and those that are attached to the peripheral aster move into a cytoplasmic protrusion, which will become the first polar body. Subsequently, the chromosomes remaining in the zygote are realigned on the metaphase plate of the second meiotic apparatus. Other than its chromatin content, the second meiotic apparatus appears to be morphologically equivalent to the first. The second polar body is formed in a manner similar to that observed in the production of the first; however, the second remains attached to the zygote via a cytoplasmic bridge at least until the time of the first cleavage. Both polar bodies appear to contain the same number and kinds of organelles and inclusions, although only the second polar body has its chromatin limited by a nuclear envelope. The maternal chromatin remaining in the zygote after the formation of the second polar body is reorganized into chromosome containing vesicles which later fuse and form the female pronucleus." @default.
- W2023277563 created "2016-06-24" @default.
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- W2023277563 date "1970-12-01" @default.
- W2023277563 modified "2023-10-18" @default.
- W2023277563 title "An ultrastructural analysis of fertilization in the surf clam, Spisula solidissima. I. Polar body formation and development of the female pronucleus" @default.
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- W2023277563 doi "https://doi.org/10.1016/s0022-5320(70)90177-2" @default.
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