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Advancement of the mitotic cleavage furrow from the outside of the cell inward towards the center of the cell. The cleavage furrow acts as a \'purse string\' which draws tight to separate daughter cells during mitotic cytokinesis and partition the cytoplasm between the two daughter cells. The furrow ingresses until a cytoplasmic bridge is formed. [GOC:kmv, PMID:12707312]
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