Wei et al. (2018) identified that FMT could alleviate the acute colitis stimulated by DSS in mice and FMT results in the upregulation of not only aryl hydrocarbon receptor (AHR) but also transforming growth factor beta (TGF-β) and IL-10 in colon tissues. Wang et al. (2020) carried out a study on active UC patients who received three times FMT from a single donor at an interval of 2–3 months. Here, AHR is linked to colitis.