The blood that remains in the human umbilical cord blood following birth contains a rich source of hematopoietic progenitor cells known as "stem cells." These stem cells are the master cells of the blood. They divide to make new red cells that supply oxygen, white blood cells that fight disease and infection, and platelets that facilitate healing. Doctors now have three sources of stem cells available to them: bone marrow, mobilized bone marrow or peripheral blood, and umbilical cord blood. Bone marrow has traditionally been used as a source of stem cells, but research is proving that cord bloo

· X-linked lymphoproliferative syndrome

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