IL9 and gastritis: Furthermore, flow cytometry examination also demonstrated the increased percentage of IL-9+ CD161+ cells (gated in TCRα7.2+ T cells) (Figures 1F,G) and IL-9+ MAIT cells (gated in TCRα7.2+ CD161+ T cells) (Figure 1H) in the gastric mucosa of H. pylori-positive gastritis patients.