AHR and colitis: To further corroborate the role of AhR activation, we used a potent AhR ligand, TCCD, to test its effect on anti‐CD40 (Figures S2C–S2F and S8A–S8K, Supporting Information) and DSS (Figures S2G–S2J and S9a–S9K, Supporting Information)‐induced colitis mouse models.