4TTC:
reference: A Switch Between One- and Two-Electron Chemistry of the Human Flavoprotein Iodotyrosine Deiodinase is Controlled by Substrate., Hu J, Chuenchor W, Rokita SE, J Biol Chem. 2014 Nov 13. pii: jbc.M114.605964. PMID: 25395621

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