CXCL13 and systemic lupus erythematosus: Serum levels of CXCL10 and CXCL13 were significantly higher in patients with SLE compared to control (38.5 (19.9, 69.6) vs 11.8 (7.28, 16.9) pg/ml, p < 0.0001) and (351.6 (231.4, 568.2) vs. 234.7 (185.2, 239.2) pg/ml, p = 0.002), respectively (Fig. 1).