Fig. 2

iNOS deletion impaired the morphology of the intestine. A Gross images of gastrointestinal tract samples from the control and iNOS^−/− groups. B The length of the small intestine (SI) of iNOS^−/− group mice was significantly shorter than that of control group mice (n = 3). C There was no difference in the length of colons from the control and iNOS^−/− groups (n = 3). D Representative images of hematoxylin and eosin staining in the ileum for the control group and iNOS^−/− mice. Bar = 50 μm. E Statistical analysis of villus height, crypt depth, crypt width and crypt density between the control group and iNOS^−/− group. n.s: P > 0.05, *P < 0.05, ****P < 0.0001, n = 3