
In cell biology, the cleavage furrow is the indentation of the cell`s surface that begins the progression of cleavage, by which animal and some algal cells undergo cytokinesis, the final splitting of the membrane, in the process cell division. The same proteins responsible for muscle contraction, actin and myosin, begin the process of forming the....
Found on
http://en.wikipedia.org/wiki/Cleavage_furrow

A constriction of the cell membrane at the equator of the cell that marks the beginning of cytokinesis in animal cells. The cell divides as the furrow deepens.
Found on
https://www.encyclo.co.uk/local/21571
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