CXCR5 and myeloid sarcoma: To this end, we used flow cytometry to determine cell surface CXCR5 baseline expression in different populations of T and B lymphocytes from MS patients grouped according to the presence or absence of the minor allele of the rs10892307 polymorphism, given its high LD with the rs11602393 SNP (r2 = 0.94; D’ = 1.0).