A. CD4+ T cells were isolated from Mir155+/+ or Mir155−/− spleens and cultured in the presence of plate bound CD3 and soluble CD28 antibodies, with (Th17 cell) and without (Th0 cell) IL-6 (50 ng/ml) and TGF-β (2 ng/ml). After 96 hours, expression of IL-17A and IFN-γ was assayed by intracellular staining following by flow cytometry. B. Results from a representative experiment are represented graphically (n=2). Data represent three independent experiments. C. Expression of Mir155 was measured by qPCR before and after activation with CD3 and CD28 antibodies (n=3). D. Expression of BIC, Mir155, and IL-17A in WT and Mir155−/− CD4+ T cells was assayed by qPCR following 96 hours of culture with CD3 and CD28 antibodies alone, or in Th17 cell skewing conditions (n=2). Data represent two independent experiments. Error bars represent +/−SEM.