CD4+ T cells were isolated by negative selection from WT or EGR4-/-mice. (C) CD4+ T cells were incubated with anti-CD3/CD28 antibodies for 6 hrs before measuring expression of IFNγ, IL-2, IL-17 and IL-4 by FACS analysis. Data are mean±SEM; a minimum of 3 biological replicates were examined; each biological replicate includes 2 technical replicates. 