2XQV:
reference: The X-ray Structure of the Zinc Transporter ZnuA from Salmonella enterica Discloses a Unique Triad of Zinc-Coordinating Histidines., Ilari A, Alaleona F, Petrarca P, Battistoni A, Chiancone E, J Mol Biol. 2011 Apr 21. PMID: 21530543

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