Not so. Nor is it clear how the transplanted immune cells stop the existing ones from attacking the new organ.
不仅如此，被移植的免疫细胞是如何阻止现有的免疫细胞去攻击新的器官的机理也尚不明朗。
2
In other cases, transplant recipients decide to reduce or stop immunosuppressive therapy against their physicians advice, even though by doing so, they risk losing their transplanted organ.
Creating an organ using a patient's own stem cells solves the problem of having to use powerful immunosuppressant drugs to stop the body rejecting a another person's kidney.