5X6B:
reference: Structural basis for tRNA-dependent cysteine biosynthesis., Chen M, Kato K, Kubo Y, Tanaka Y, Liu Y, Long F, Whitman WB, Lill P, Gatsogiannis C, Raunser S, Shimizu N, Shinoda A, Nakamura A, Tanaka I, Yao M, Nat Commun. 2017 Nov 15;8(1):1521. doi: 10.1038/s41467-017-01543-y. PMID: 29142195

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