Standard flow cytometry methods were used to evaluate cell surface marker expression using various combinations of FITC, PE, PE-Cy5, PE-Cy7, APC, APC-Cy7–conjugated anti-CD3, anti-CD4, anti-CD16, anti-CD25, anti-CD29, anti-CD45RA, anti-CD56, and PE anti-CXCR4 antibodies (Life Technologies; the rest of the antibodies are from BD). CFSE dilution assays were performed as previously described (Zhang et al., 2009 (link)). Samples were acquired on a FACSCanto instrument using FACSDiva software (BD). Analyses were performed using the FlowJo software version 9 and higher (Tree Star).