5WMU:
reference: Structural insights into substrate and inhibitor binding sites in human indoleamine 2,3-dioxygenase 1., Lewis-Ballester A, Pham KN, Batabyal D, Karkashon S, Bonanno JB, Poulos TL, Yeh SR, Nat Commun. 2017 Nov 22;8(1):1693. doi: 10.1038/s41467-017-01725-8. PMID: 29167421

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).