3NRQ:
reference: Characterization of a Dipartite Iron Uptake System from Uropathogenic Escherichia coli Strain F11., Koch D, Chan AC, Murphy ME, Lilie H, Grass G, Nies DH, J Biol Chem. 2011 Jul 15;286(28):25317-30. Epub 2011 May 19. PMID: 21596746

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