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| HLA-A1 Antigen HLA-A1 | Antigen, HLA-A1 | HLA A1 Antigen Human histocompatibility (HLA) surface antigen encoded by the A locus on chromosome 6. Individuals bearing this allele are more susceptible to Hodgkin's disease. HLA-A1 is in linkage disequilibrium with HLA-B8 and HLA-DR3. |