Fig. 10From: Indoleamine 2,3-dioxygenase 1 (IDO1) inhibitors in clinical trials for cancer immunotherapyThe active site of the IDO1/4-PI complex (PDB code: 2D0T). The heme site is colored in green. The 4-PI is displayed in yellow stick, and the CHES is highlighted in cyan. The H-bonding interactions are indicated by the blue dotted linesBack to article page