Cytokinesis
Cytokinesis is the process by which cells divide their cytoplasm to accomplish the division of the cells. In animal cells this is accomplished through the actions of the cell's cytoskeleton and the formation of a cleavage furrow. Microfilaments align along the equator of the cell. Microfilaments, remember, are composed of actin, a contractile protein. These filaments overlap each other and then start to pull the membrane inward. Since membranes are self-sealing once the membrane is pulled in and touches the membrane on the opposite side of the cell the two daughter cells separate.
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