| http://www.w3.org/ns/prov#value | - Because of this, in certain procedures, surgeons will often extract tissues or fluids from a patient, put it through a separation process, such as centrifugation, select a fraction which is known to be rich in desired materials, such as growth factors, stem cells or progenitor cells, and then re-inject that material into the patient at a point of injury or surgical intervention to promote healing.
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