Following based on experience in my family:
The doner's blood is drawn, run through a machine that will separate stem cells in their blood, and then the rest of the blood is pumped back into the donor. In my experience, the separated stem cell solution is (appropriately) golden in color. Those stem cells are given to the recipient via an IV. The donor's stem cells then take root in the recipient's bone marrow, allowing them to produce their own blood.
Thank you for considering being a donor. My mother survived leukemia as a result of a stem cell transplant to give her functional bone marrow.
Gyro
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