A & B. CLN4 CD8 T cells were cultured in vitro for 72 hours with PEM from wild type (WT), Stat3-KO, Stat4 KO or Stat6 KO mice, previously loaded with the class-I dominant epitope of HA, IYSTVASSL at 10ng/mL (or left untreated). . Plots represent CD8+/Vβ8+/Thy1.1+ gated populations depicting proliferation, measured by CFSE dilution, versus IFN-γ production. C. Dose-response effects (white bars –no peptide; gray bars - 1ng/mL peptide pulse; black bars - 10ng/mL peptide pulse) in terms of antigen-specific proliferation as measured by CFSE dilution (top figure) and cytokine production as determined by intracellular cytokine staining (middle and bottom figures).