AHR and type 1 diabetes mellitus: Given the fact that AHR is widely expressed in innate immune cells (e.g., DCs, macrophages, ILCs, IELs, and iNKTs), effector T cells (e.g., Th1 and Th17 cells), and anti-inflammatory cells (e.g., tolerogenic DCs, Tr1, and Tregs), we thus in the present review discussed its potential role in T1D pathogenesis.