2EZ7:
reference: Carbonic Anhydrase Activators. Activation of Isozymes I, II, IV, VA, VII, and XIV with L- and D-Histidine and Crystallographic Analysis of Their Adducts with Isoform II: Engineering Proton-Transfer Processes within the Active Site of an Enzyme., Temperini C, Scozzafava A, Vullo D, Supuran CT, Chemistry. 2006 Jun 28;. PMID: 16807956

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