An isoantigen is a type of antigen which is present only in subsets of a species. Two major types of isoantigens are blood group antigens and histocompatibility antigens. ...
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http://en.wikipedia.org/wiki/Isoantigen
<immunology> An antigen which can cause an immune response in genetically distinct individuals from the same species. ... They exist in alternative (allelic) forms in a species, and thus induce an immune response when one form is transferred (for example by blood transfusion or tissue graft) to members of the same species who lack the antigen...
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http://www.encyclo.co.uk/local/20973
(i″so-an´tĭ-jәn) an antigen existing in more than one form in a species (see allele), thus inducing an immune response when one form is transferred to members of the species who lack it; typical isoantigens are the blood group antigens.
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Type: Term Pronunciation: ī′sō-an′ti-jen Definitions: 1. An antigenic substance that occurs only in some individuals of a species, such as the blood group antigens of humans. For specific isoantigens of blood groups, see the Blood Groups Appendix. 2. Sometimes used as a synonym of alloantigen.
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(formerly) an alloantigen.
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https://www.infoplease.com/dictionary/isoantigen
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