alloantigen

American  

[al-oh-an-ti-juhn, -jen] / ˌæl oʊˈæn tɪ dʒən, -ˌdʒɛn /

noun

Immunology.

1. an antigen present in some but not all individuals of the same species, as those in different human blood groups.

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Etymology

Origin of alloantigen

First recorded in 1965–70; allo- + antigen