What Are Bone Marrow Stem Cells?

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Bone marrow is the soft, sponge-like material found inside bones. It contains immature cells known as hematopoietic or blood-forming stem cells. Hematopoietic stem cells divide to form more blood-forming stem cells, or they mature into one of three types of blood cells:


  • white blood cells: which fight infection.

  • red blood cells: which carry oxygen.

  • platelets: which help the blood to clot.


Most hematopoietic stem cells are found in the bone marrow, but some stem cells, called peripheral blood stem cells (PBSCs), are found in the bloodstream. Blood in the umbilical cord also contains hematopoietic stem cells. Cells from any of these sources can be used in transplants.


In 90% of transplants today stem cells from the blood stream, peripheral blood stem cells (PBSCs), are used.


Meaning that what we know from TV programs to be scary seeming bone marrow transplants that require an operation are now days in actual fact as simple as a blood donation.



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