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| HLA-A3 Antigen HLA-A3 | Antigen, HLA-A3 | HLA A3 Antigen Human histocompatibility (HLA) surface antigen encoded by the A locus on chromosome 6. The allele occurs with increased frequency in individuals with idiopathic hemochromatosis. HLA-A3 is in linkage disequilibrium with HLA-B7 and HLA-DR2. |