Xenoantigen
An antigen that is found in more than one species. An antigen is something that is capable of inducing an immune response. The prefix "xeno-" means foreign or other. It comes from the Greek "xenos" meaning stranger, guest, or host.

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xeno·an·ti·gen (zen″o-anґtĭ-jən) an antigen occurring in organisms of more than one species, e.g., the A and B antigens of the ABO blood group.

Medical dictionary. 2011.

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