PECAM1 and colitis: A significant increase in cross‐sectional vessel area (sham d7 vs severe colitis d28: 731.0 ± 2066 μm2 vs 980.8 ± 1617 μm2, P < 0.0001, Figure 4p and Figure S9, Supporting Information) observed in CD31‐stained histopathological colon cross sections suggest a dilation of blood vessels and/or an absence of smaller vessels.