In mature animals, cell division is mainly restricted to repairing tissues by replacing old or damaged cells.
The majority of the body's tissues grow by increasing their cell number, but this growth is tightly controlled to keep the various tissues in balance. The majority of cell division in mature animals is used for tissue renewal rather than growth, and many types of cells are constantly replaced. For instance, skin cells are constantly being removed and replaced; In this instance, mature differentiated cells do not divide; instead, immature stem cells divide to replenish their population. In some other cells, like the liver's, mature cells can continue to divide after an injury to allow for growth or regeneration.
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