CLDN5 and rheumatoid arthritis: Infliximab-treatment of RA animals restored the expression of claudin-5 (WT: 0,79 ± 0,15, n = 8 vs. RA Infliximab: 1,04 ± 0,14, n = 11; P = NS, Fig. 3C,D) and occludin (WT: 0,77 ± 0,06, n = 6 vs. RA Infliximab: 0,70 ± 0,06, n = 10; P = NS, Fig. 3E,F) to WT levels.