since patients with rheumatoid arthritis ( ra ) exhibit serum hypergammaglobulinemia and autoantibody ( rheumatoid factor ) production , we compared elaboration and control of in vitro ra mononuclear cell ( mnc ) , ig assayed by enzyme-linked immunoassays or by hemolytic plaque formation , in 37 ra patients and 17 normal subjects .
C0004358
autoantibody
C0035448
rheumatoid factor