title: Structural polymorphism of the beta chain of human HLA-DR antigens.
mesh_terms: D001402:B-Lymphocytes / Q000276:immunology; D002460:Cell Line; D055598:Chemical Phenomena; D002621:Chemistry; D002851:Chromatography, High Pressure Liquid; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D006801:Humans; D010455:Peptides / Q000032:analysis*; D010641:Phenotype; D010649:Phenylalanine / Q000032:analysis; D013329:Structure-Activity Relationship; D014357:Trypsin
chemical_list: D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D010455:Peptides; D010649:Phenylalanine; D014357:Trypsin