Since the balance of Th17 and Treg cells, which can be influenced by AhR activation, significantly determines homeostasis vs inflammatory processes in several tissues [62], the expression patterns of the transcription factors RORγt (Th17 cells) and FoxP3 (Treg cells) were analysed in situ in the colon of colitis vs healthy mice. The gene discussed is AHR; the disease is colitis.