They are used in bone-marrow transplants to treat leukaemia – but in these cases, donor blood taken in the usual way is used to harvest the stem cells.
The disease starts when the immune cells in donorbone marrow identify the recipient's cells as foreign and launch an attack.
这种病症往往发生在捐献体的免疫细胞辨认出接受体细胞为外来细胞并发出攻击。
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In November, German haematologist Gero Huetter announced that he had cured a man of HIV through a bone marrow transplant from a donor who had a genetic resistance to the virus.