Stem cells have the remarkable potential to develop into many different cell types in the body during early life and growth. In many tissues, they serve as a sort of internal repair system, dividing essentially without limit to replenish other cells.
There are two kinds of stem cells:
* Embryonic stem cells are derived from embryos that develop from eggs that have been fertilized (found in 4-5 days old embryos). They can become all cell types of the body.
* Non embryonic/adult stem cells are found in a tissue or organ that can renew itself and can differentiate to yield some or all of the major specialized cell types of the tissue or organ. For example: for adult stem cell transplant, the stem cell source is from bone marrow, and it's known as a bone marrow transplant. If the stem cell source is from an umbilical cord, then it's called as umbilical cord blood transplant.
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