4WCL:
reference: Helical Shape of Helicobacter pylori Requires an Atypical Glutamine as a Zinc Ligand in the Carboxypeptidase Csd4., Chan AC, Blair KM, Liu Y, Frirdich E, Gaynor EC, Tanner ME, Salama NR, Murphy ME, J Biol Chem. 2014 Dec 12. pii: jbc.M114.624734. PMID: 25505267

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