1EJS:
reference: Kinetic and structural characterization of urease active site variants., Pearson MA, Park IS, Schaller RA, Michel LO, Karplus PA, Hausinger RP, Biochemistry 2000 Jul 25;39(29):8575-84. PMID: 10913264

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