Figure 3. Characterization of IL-21-expressing NKT cells PFMCs were stimulated for 6 hrs with PPD plus anti-CD28, the cells were stained for NKT cells and analyzed for phenotypes of NKT cells.

A. IL-21⁺ NKT and IL-21⁻ NKT cells were gated for the analysis of the expression of CD45RO, CD62L and CCR7. B. Statistical results of the percentages of CD45RO, CD62L and CCR7 on IL-21⁺ NKT and IL-21⁻ NKT cells. *, P < 0.05; **, P < 0.01.