| http://www.w3.org/ns/prov#value | - Until recently it has been widely assumed that there are 2 major classes of stem cells: embryonic stem cells derived from early embryos, able to replenish all cell types in the animal, and stem cells located in various organs of the body, dedicated to the replenishment of specific tissues, such as blood, muscle, and brain (for a review, see Fuchs and Segre84).
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