CXCR5 and rheumatoid arthritis: The co-expression of CCR6/CXCR3/CXCR5 was higher in ST of PsA patients (p=0.06 vs PBMC) and the co-expression of CCR6/CXCR4/CXCR4/CXCR5 was significantly higher in ST of RA patients (p< 0.001 vs PBMC).