1HZO:
reference: Structure of an extended-spectrum class A beta-lactamase from Proteus vulgaris K1., Nukaga M, Mayama K, Crichlow GV, Knox JR, J Mol Biol 2002 Mar 15;317(1):109-17. PMID: 11916382

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