[Seronegative arthritis].
D001172:Arthritis, Rheumatoid / Q000276:immunology*; D005260:Female; D006801:Humans; D008297:Male; D012217:Rheumatoid Factor / Q000032:analysis*; D013167:Spondylitis, Ankylosing / Q000276:immunology
D012217:Rheumatoid Factor
Artritis seronegativas.