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Serum levels of CXCL9 (a), CXCL10 (b), CXCL11 (c), and CXCR3 (d) in primary Sjögren’s syndrome (pSS), rheumatoid arthritis (RA), and healthy controls (HCs). Data are expressed as means ± standard deviations and were analyzed using one-way ANOVA to compare the serum levels of CXCL9, CXCL10, CXCL11, and CXCR3 among the three groups. Post hoc pairwise comparisons were conducted using Tukey's HSD test
