Several chemokines (CCL3, CCL4, CCL5, CCL3L1, CCL21, CCL26, CXCL8, CXCL9, CXCL10, CXCL12, and CXCL13) have been reported as risk factors for RA development (11–25). Here, CXCL13 is linked to rheumatoid arthritis.