Definition of alloantigen
: an antigen present only in some individuals (as of a particular blood group) of a species and capable of inducing the production of an alloantibody by individuals which lack it
First Known Use of alloantigen
Medical Definition of alloantigen
: a genetically determined antigen present in some but not all individuals of a species (as those of a particular blood group) and capable of inducing the production of an alloantibody by individuals which lack it—called also isoantigen
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