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A protein or other substance, such as histocompatibility or red blood cell antigens, that is present in only some members of a species and therefore able to stimulate isoantibody production in other members of the same species who lack it. Also called alloantigen.
i′so·an′ti·gen′ic (-jĕn′ĭk) adj.
i′so·an′ti·ge·nic′i·ty (-jə-nĭs′ĭ-tē) n.
(Physiology) immunol an antigen that stimulates antibody production in different members of the same species
i•so•an•ti•gen(ˌaɪ soʊˈæn tɪ dʒən, -ˌdʒɛn)
(formerly) an alloantigen.