Tumors collected and analysed for exhaustion/anergy. Cells were collected and enriched for the immune cell population by Ficoll-Hypaque. WT cells were 36.9 ± 4.68% Thy1.2+, EGR4KO cells were 48.0 ± 0.58% Thy1.2+. (A) CD4+ and CD8+ T cells were stimulated in vitro with ionomycin/PMA before intracellular staining for IFNγ, IL-17 and IL-9 and FACS analysis. 