Naturally occurring human antibodies to the F(ab')2 portion of IgG.


Antibodies to the F(ab')2 portion of IgG were detected in the sera of patients and normals using a heat-aggregated F(ab')2 fragment in a liquid-phase radioimmunoassay. The antibodies were found in 72% of 82 rheumatoid arthritis patients, in less than 20% of patients with other diseases and in a few normal subjects. Anti-F(ab')2 antibodies were distinct from… (More)


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