Stem Cell

'''Stem cells''' are undifferentiated cells found in most, if not all, multi-cellular organisms. They are characterized by the ability to [[Self-Rejuvenation|regenerate and renew themselves]] and the ability to differentiate into other cells. Their daughter cells may differentiate into other cell types (such as blood cells,..) which can be used to regenerate and repair the body. Therefore they are the body building cells of multi-cellular organisms. [[Cancer_Stem_Cell|Cancer stem cells]] are cancer cells that possess characteristics associated with normal stem cells.