CD79A and rheumatoid arthritis: Contrary to our expectations, IgG AHAs against IgG1 F(ab’)2MMP-3 were not significantly higher in RA patients than HC, although IgA AHAs against IgG1 F(ab’)2MMP-3 and, moreover, both IgG and IgA AHA against IgG4 F(ab’)2MMP-3 were significantly elevated in RA patients.