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Levels of C4 and its correlation with C3. Levels of C4 (a) were evaluated in controls (n = 66) and rheumatoid arthritis (RA) patients (n = 45). The horizontal bar represents the median value. The P-value was assessed by unpaired t-test. Correlation of C4 with C3 (b,c) in controls (n = 66) and RA patients (n = 45). The coefficient of correlation (r) and P-value was calculated by Spearman's rho analysis and two-tailed test, respectively.
