Rheumatoid factors.
D001172:Arthritis, Rheumatoid / Q000276:immunology*; D002908:Chronic Disease; D006801:Humans; D007239:Infections / Q000276:immunology; D007841:Latex Fixation Tests; D012216:Rheumatic Diseases / Q000276:immunology; D012217:Rheumatoid Factor / Q000032:analysis / Q000502:physiology
D012217:Rheumatoid Factor