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- W2023317106 abstract "Summary Fertilization and early cleavage of the zygote in H. polygyrus have been examined using light and electron microscopy and histochemistry. Fertilization occurs in the anterior uterus where many sperm cluster around each oocyte. The successful spermatozoon lies lengthwise against the oolemma and appears to produce a secretion, believed to originate from the sperm membraneous organelles, which erodes the oolemma. The entire sperm enters the oocyte, the cytoplasmic constituents of the sperm disintegrate, and the condensed nucleus migrates towards the egg nucleus. Just after sperm penetration the egg chromosomes undergo meiosis I, producing a single polar body. The sperm nucleus then enters the egg nucleus and decondenses to produce 6 chromosomes. Cleavage of the zygote is rapidly initiated. Early division of the zygote is usually asynchronous and asymetric. The eggshell is produced immediately following fertilization and is formed primarily from large lipoid inclusions in the oocyte cytoplasm. The cells lining the anterior uterus have extensive endoplasmic reticulum and Golgi bodies and unique reticulate bodies which may function in producing a secretion around the developing eggs." @default.
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- W2023317106 date "1987-01-01" @default.
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- W2023317106 title "A Light and Electron Microscopical Investigation of Fertilization, Chromosome Behaviour, and Early Cleavage Patterns in<i>Heligmosomoides polygyrus</i>(Nematoda: Trichostrongyloidea)" @default.
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- W2023317106 doi "https://doi.org/10.1080/01688170.1987.10510269" @default.
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