Medical Definition of alloimmune
: of, relating to, or characterized by isoimmunization Various studies over the past decade have indicated that the alloimmune response, mediated by anti-HLA antibodies, plays a key role in the failure of kidney allografts; this concept has been extended to heart, lung, and composite tissue transplants.—Alexandre Loupy et al., The New England Journal of Medicine, 26 Sept. 2013
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