IL17A and colitis: To further determine the impact of mPGES-1 on the developing Th17 and Th1 immunologic responses associated with colitis, after inducing colitis, we determined the fraction of Th17 and Th1 cells that produced IL-17A and IFNγ in cell populations from spleen and LP of the colon from mPGES-1−/− and WT mice.