Seronegative arthritis: psoriatic arthritis.
D001168:Arthritis / Q000175:diagnosis / Q000235:genetics / Q000276:immunology; D001172:Arthritis, Rheumatoid / Q000175:diagnosis; D003937:Diagnosis, Differential; D006680:HLA Antigens / Q000032:analysis; D015796:HLA-B27 Antigen; D006801:Humans; D010641:Phenotype; D011565:Psoriasis / Q000175:diagnosis / Q000235:genetics / Q000276:immunology; D013166:Spondylitis / Q000209:etiology / Q000276:immunology
D006680:HLA Antigens; D015796:HLA-B27 Antigen