Let me clarify: Stem cells are the mother cells. For blood formation the stem cells reside in the bone marrow but they also circulate in the blood. In the old days we took the stem cells out of the bone marrow with needles. Now we can spin the blood(from a vein) and take th stem cells out and use them for transplants to make new blood. This is stricly for creating new blood cells. But each organ has its stem cell.
Answered 5/22/2013
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