1ZRS:
reference: P. aeruginosa LD-carboxypeptidase: A serine peptidase with a Ser-His-Glu triad and a nucleophilic elbow., Korza HJ, Bochtler M, J Biol Chem 2005 Sep 14;. PMID: 16162494

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