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sCD28 and sCTLA4 levels. A, and (B) Serum concentration of sCD28 and SCTLA4 in RA patients and CS. The differences between RA patients and CS were determined by Kruskal‐Wallis test. Data are expressed as median (p5‐p95). C, Correlation between sCD28 and anti‐CCP in 35 RA patients. Spearman's test was used as the statistical test
