Figure 3 . a: Photographs of the colons of mice in each group. b: Changes in the colon length of mice in each group. The WT normoxia control group (NC), MPO-/- normoxia control group (KC), WT C. rodentium infection group (NI), MPO-/- C. rodentium infection group (KI), WT hypoxia control group (HC), MPO-/- hypoxia control group (HKC), WT hypoxia C. rodentium-infected group (HI) and MPO-/- hypoxia C. rodentium-infected group (HKI).