Stem Cells
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Unspecialized cells from which other types of cells develop. When a stem cell divides, each new cell has the potential either to remain a stem cell or to become a specialized cell with a distinct function, such as a muscle cell or blood cell. Stem cells serve as a repair system for the body, replacing old and damaged cells. Stem cell transplants are used in cancer treatment. Research on using stem cells to treat other diseases is currently under way.