alloantigen

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al·lo·an·ti·gen

(al'ō-an'ti-jen),
An antigen that occurs in some but not all members of the same species. Used by the immune system to distinguish self from nonself.

alloantigen

(ăl′ō-ăn′tĭ-jən)

alloantigen

An antigen that occurs in some members of a species, which in humans is determined in part by the major histocompatibility complex.

al·lo·an·ti·gen

(al'ō-an'ti-jen)
An antigen that occurs in some, but not in other members of the same species. The term isoantigen is sometimes used in this sense.