Figure 3 (A) Colonic paracellular permeability measured 72 hours after an acute stress session or BrX‐537A injection (2 mg/kg intraperitoneally) in B6‐Ifng‐−/− mice and their wild‐type (WT) control C57BL/6 mice. Values are mean (SD) per cent 51Cr‐EDTA crossing the epithelial barrier. **p<0.01 and ***p<0.001 compared with control value; n = 8 per group. (B) Time dependent effects of BrX‐537A injection (2 mg/kg intraperitoneally) on interferon γ (IFN‐γ) expression (pg of IFN‐γ per mg of total protein). Values are mean (SEM). *p<0.05 compared with vehicle values; n = 8 per group. T = time after BrX‐537A perfusion.