Rheumatoid Factor is ?
A. IgG
B. IgA
C. IgM
D. IgD
E. IgE
Option "C" is the most appropriate answer
► RF represents multiple antibodies → MOSTLY IgM → but sometimes IgG or IgA
► All RF antibodies → directed against the Fc fragment of IgG.
Robbins 9E & Rubin 7E
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