After an allogeneic organ transplant, the patient has to take anti-rejection drugs for a long time.
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usage
Most often met in 异体字, a variant character: same sound and meaning as the standard form but a different shape, like 峯 for 峰. In medicine it means tissue from another person, as in 异体移植, an allotransplant; the opposite is 自体, from one's own body.