Moreover, the use of AHR ligand 2,3,7,8‐Tecrachlorodibenzo‐p‐dioxin (TCDD) in Nonobese diabetic (NOD) mice could reduce the pancreatic islet insulitis with an expansion of Treg in the pancreatic lymph nodes, which indicated a suppression in the development of T1D [127]. Here, AHR is linked to type 1 diabetes mellitus.