Cytokines produced in mice following IV injection of ConA (A) or by spleen cells following stimulation with 1 μg/ml Con A (B) or with plate-immobilized anti-CD3 (2 μg/ml) and anti-CD28 (1 μg/ml) antibodies (C), or purified CD4+ T cells stimulated with anti-CD3/CD28 antibodies (D) were determined from wild-type (solid squares) and homozygous mutant mice (open circles). The levels of IL-6, MCP-1, IL-2, IFN-γ and TNF-α in plasma, and IL-2, IFN-γ, IL-17 and TNF-α in cell culture supernatants were measured by CBA assay. Mean values (± S.D.) for 9 independent experiments (A–C) or 3 experiments (D) are plotted. (*, <0.05; #, <0.005; and ^, <0.0005, repeated measures ANOVA with Bonferroni post-test).