Figure 4.

M cells detected in a colonic lymphoid follicle of an IFN-γ−/− mouse after TNBS enema. Irregular microvilli with attached bacteria and an underlying macrophage are shown. Bar, 5 μm.

M cells detected in a colonic lymphoid follicle of an IFN-γ−/− mouse after TNBS enema. Irregular microvilli with attached bacteria and an underlying macrophage are shown. Bar, 5 μm.