CD33 and tuberculosis: MDSC-depleted PBMCs (TB), treated with mitomycin C, were cultured with allogeneic CFSE-labeled PBMCs from HD (CFSE-labeled PBMCs (HD)) and with sorted CD14-CD11b+CD33+ HLA-DRlow/- MDSCs (MDSCs (TB)) at different ratios (1:2, 1:4 and 1:8).