IL17A and inflammatory bowel disease: We detected an increase of IL‐17‐producing ILC3 cells (cluster 15) in colonic mucosa samples of UC and CD patients compared to non‐inflamed tissue controls (Fig 5A), which is in line with a recent study that had observed a larger abundance of ILC3 cells in the peripheral blood of IBD patients with active disease (Mitsialis et al, 2020).