Stem cells are derived from embryonic and non-embryonic tissues. Most stem cell studies are for animalstem cells and plants have also stem cell. Stem cells were discovered in 1981 from early mouse embryos. Stem cellshave the potential to develop into all different cell types in the living body. Stem cell is a body repair system. Whena stem cell divides it can be still a stem cell or become adult cell, such as a brain cell. Stem cells are unspecializedcells and can renew themselves by cell division, and stem cells can also differentiate to adult cells with specialfunctions. Stem cells replace the old cells and repair the damaged tissues. Embryonic stem cells can become all celltypes of the body because they are pluripotent. Adult stem cells are thought to be limited to differentiating intodifferent cell types of their tissue of origin.
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