contractile ring

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A transitory organelle that, during late anaphase and telophase, assumes the form of a continuous equatorial annulus beneath the plasma membrane of the cleavage furrow. The ring is composed of an array of actin microfilaments aligned circumferentially along the equator of the cell. An interaction between cytoplasmic myosin and these actin molecules causes them to slide past one another, closing down the contractile ring, and producing the cleavage furrow.

Subjects: Genetics and Genomics.

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