4C0X:
reference: The Crystal Structure of Pseudomonas putida AzoR: the active site revisited., Goncalves AM, Mendes S, de Sanctis D, Martins LO, Bento I, FEBS J. 2013 Oct 16. doi: 10.1111/febs.12568. PMID: 24127652

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