4XFF:
reference: Structure-Based Insights into the Role of the Cys-Tyr Crosslink and Inhibitor Recognition by Mammalian Cysteine Dioxygenase., Driggers CM, Kean KM, Hirschberger LL, Cooley RB, Stipanuk MH, Karplus PA, J Mol Biol. 2016 Oct 9;428(20):3999-4012. doi: 10.1016/j.jmb.2016.07.012. Epub, 2016 Jul 29. PMID: 27477048

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