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Levels of anti-CarP antibodies isotypes in the different disease groups. HC: healthy controls, RA: rheumatoid arthritis, SSc: systemic sclerosis. Anti-CarP IgG significantly different between healthy controls and rheumatoid arthritis (p < 0.001), RA and SSc patients (p < 0.001), RA and other CTD/RP, but not between healthy controls and SSc patients (p = 0.075). No differences between the disease groups were observed for anti-CarP IgM and IgA
