Edited by M. J. van Raaij, Centro Nacional de Biotecnología -CSIC, Spain Keywords: indoleamine 2,3-dioxygenase 1; cancer immunotherapy; heme proteins; tryptophan metabolism; crystal engineering.PDB references: indoleamine 2,3-dioxygenase 1, complex with epacadostat, 6e40; complex with sulfur analog of epacadostat, 6e41; complex with 4-chlorophenyl imidazole, 6e42; complex with anolog of BMS-978587, 6e43; free enzyme (ferric), 6e44; free enzyme (ferrous), 6e45; complex with tryptophan (ferrous), 6e46Supporting information: this article has supporting information at journals.iucr.org/f High-resolution structures of inhibitor complexes of human indoleamine 2,3-dioxygenase 1 in a new crystal form

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