a, Representative images of haematoxylin and eosin-stained sections of the jejunum. b, c, Immunofluorescence analyses of sections of the jejunum of Tet2+/+ and Tet2−/− mice. b, No difference was observed between the groups in the number of apoptotic cells using the TUNEL assay (red). Nuclei of intestinal cells were visualized with DAPI (blue). c, No difference was observed in the number of apoptotic (cleaved caspase 3-positive (CC3), red) epithelial cells (pan-keratin-positive, (PanK), green) between the groups. In b, c, Jejunum sections of diphtheria-toxin-treated VDTR mice were used as a positive control. Data are representative of at least two independent experiments.