While most people know that organs can only be transplanted if their blood type is compatible, there are other factors that go into making this determination. Tissue type must match as well, although there are some anti-rejection treatments that can be done if an exact match isn't found. Organs are also more likely to be compatible with patients with similar ethnic backgrounds. While it can be frustrating for recipients who are waiting for an organ to be limited in these ways, it is done to protect them from a situation in which their body rejects the organs, and their recovery is further complicated.
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