Both CXCL13 and CXCL10 were correlated with IgG index in MS cases, in agreement with prior studies.9 10 CXCL13 recruits B cells to sites of inflammation through their CXCR5 receptors, whereas CXCL10 is thought to fuel MS pathogenesis through type 1 T helper and natural killer cell recruitment.49 This evidence concerns the gene CXCL10 and myeloid sarcoma.