1EF2:
reference: Characterization of metal-substituted Klebsiella aerogenes urease., Yamaguchi K, Cosper NJ, Stalhandske C, Scott RA, Pearson MA, Karplus PA, Hausinger RP, J Biol Inorg Chem 1999 Aug;4(4):468-77. PMID: 10555581

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