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- W2018572145 abstract "It generally is assumed that cleavage furrows start ingression at anaphase, but this is not always true. Cleavage furrows are initiated during prometaphase in spermatocytes of the flatworm Mesostoma, becoming detectable soon after the spindles achieve bipolarity. The furrows deepen during prometaphase, but ingression soon arrests. After anaphase the pre-existing furrow recommences its ingression and rapidly cleaves the cell. Such “precocious” furrowing also commonly occurs in diatoms and other algae. The position of the “precocious” cleavage furrow changes when there are changes in the distribution of chromosomes. Each of the 4 unipolarly-oriented univalent chromosomes moves to a pole at the start of prometaphase but later in prometaphase may move to the opposite pole. The furrow position adjusts during prometaphase according to the numbers of univalents at the two poles: when there are two univalent chromosomes at each pole the furrow is symmetrical at the spindle equator, but when there are unequal numbers at the poles the furrow shifts 2–3 μm toward the half-spindle with fewer univalents. Nocodazole causes spindle microtubules to disappear. After addition of nocodazole, bivalents become detached from one pole and move toward the other, which causes the furrow to shift 2–3 μm toward the pole with fewer chromosomes. Furrow positioning thus is sensitive to the positioning of chromosomes in the spindle and furrow positions change in the absence of spindle microtubules." @default.
- W2018572145 created "2016-06-24" @default.
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- W2018572145 date "2010-08-01" @default.
- W2018572145 modified "2023-10-16" @default.
- W2018572145 title "Precocious (pre-anaphase) cleavage furrows in Mesostoma spermatocytes" @default.
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- W2018572145 doi "https://doi.org/10.1016/j.ejcb.2010.03.001" @default.
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