CXCL13 and systemic lupus erythematosus: Renal macrophages and DC in lupus-prone mice may be the source of CXCL13 in the nephritic kidney [24, 26–29], leading to increased migration of CXCR5+ B cells and TFH-like cells into the inflamed kidney towards CXCL13 [24, 26, 30].