Cleavage furrow
= Cleavage furrow
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A <cleavage furrow> is the inward indentation of the <cell membrane> during <cytokinesis>. It is the visible deformation; the <actomyosin ring> is machinery beneath that boundary.<Biology 2e by Mary Ann Clark and others/The Cell Cycle>[Biology 2e by Mary Ann Clark and others; §10.2, Cytokinesis, animal-cell paragraph and Figure 10.9]{ref}