EBI3 and rheumatoid arthritis: RA patients carrying the C/C genotype exhibited significantly decreased EBI3 mRNA expression levels (0.07 ± 0.001) than the T/T (1.5 ± 0.2, **p = 0.0047) and C/C (0.7 ± 0.05, *p = 0.0337) genotypes of the controls (Figure 4B).