title: Decreased HLA-DR4 antigen frequency in homosexual males.
mesh_terms: D006681:HLA-D Antigens / Q000032:analysis*; D006684:HLA-DR Antigens / Q000032:analysis*; D015804:HLA-DR4 Antigen; D006716:Homosexuality; D006801:Humans; D008297:Male; D012749:Sexually Transmitted Diseases / Q000276:immunology
chemical_list: D006681:HLA-D Antigens; D006684:HLA-DR Antigens; D015804:HLA-DR4 Antigen