Abstract
The aryl hydrocarbon receptor (AHR) has been subject of research for its importance in physiological processes and diseases, such as immunological tolerance and tumor immuno-escape. Exogenous and endogenous compounds are ligands of AHR. Kynurenine (Kyn), one of the metabolites resulting from the degradation of tryptophan (Trp), stands out among the endogenous ligands of AHR. In relation t…