4IWS:
reference: Structural Insights into the UbiD Protein Family from the Crystal Structure of PA0254 from Pseudomonas aeruginosa., Jacewicz A, Izumi A, Brunner K, Schnell R, Schneider G, PLoS One. 2013 May 9;8(5):e63161. doi: 10.1371/journal.pone.0063161. Print 2013. PMID: 23671667

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