A shallow groove in the cell surface near the old metaphase plate. Indicates the beginning of cleavage during cytokinesis. On the cytoplasmic side of the furrow is a contractile ring of actin microfilaments associated with molecules of the protein my

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1. A shallow groove in the cell surface near the old metaphase plate. Indicates the beginning of cleavage during cytokinesis. On the cytoplasmic side of the furrow is a contractile ring of actin microfilaments associated with molecules of the protein my