Epacadostat (1204669-58-8) is a potent (IC50 = 10nM)1 and selective inhibitor of Indoleamine-2,3-dioxygenase 1 (IDO1) with no activity at IDO2 or TDO.2 It restored tryptophan levels and significantly impaired kynurenine generation in CT26 colon carcinoma
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