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Some cells (but not all) have the ability to multiply by division. Most of the diseases known to medical science are due to malfunction of cells, to premature cell death, or to cells' wrong multiplication rates.
<nowiki><nowiki>[[Stem cells are a particular kind of cells, with two major characteristics:]]</nowiki></nowiki>
'''1.''' they are unspecialized cells that can divide over and over for very long periods of time;
