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isoantigen |
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isoantigen [¦ī·sō′ant·ə·jən] (immunology) An antigen in an individual capable of stimulating production of a specific antibody in another member of the same species. Also known as alloantigen. Isoantigen An immunologically active protein or polysaccharide present in some but not all individuals in a particular species. These substances initiate the formation of antibodies when introduced into other individuals of the species that genetically lack the isoantigen. Like all antigens, they are also active in stimulating antibody production in heterologous species. The ABO, MN, and Rh blood factors in humans constitute important examples. Consequently, elaborate precautions for typing are required in blood transfusion. See Antibody, Antigen, Blood groups How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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