An actomyosin ring is a contractile assembly containing actin filaments and myosin II. In typical animal cytokinesis, it forms in the cell cortex beneath the cell membrane. Its contraction draws the boundary inward to produce a cleavage furrow; an inward groove is not yet complete separation of the daughters.[ref]
The Events of M Phase. The Cell: A Molecular Approach, 2nd edition, Chapter 14, The Events of M Phase, Cytokinesis and Figure 14.30: actin–myosin II ring beneath the plasma membrane
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