CXCR4 and rheumatoid arthritis: In particular, we observed an increase in the co-expression of CXCR3/CXCR5 in PsA (p=0.08 ST vs PBMC, Figure 2D) and a significant increase in CXCR4/CXCR5 RA (p<0.001 ST vs PBMC and p<0.05 ST vs SFMC).