title: Seronegative rheumatoid arthritis and B7-CREG: disparate results.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000276:immunology*; D006680:HLA Antigens / Q000032:analysis*; D015793:HLA-B7 Antigen; D006801:Humans; D012698:Serologic Tests
chemical_list: D006680:HLA Antigens; D015793:HLA-B7 Antigen