4BZ4:
reference: CorA Is a Copper Repressible Surface-Associated Copper(I)-Binding Protein Produced in Methylomicrobium album BG8., Johnson KA, Ve T, Larsen O, Pedersen RB, Lillehaug JR, Jensen HB, Helland R, Karlsen OA, PLoS One. 2014 Feb 3;9(2):e87750. doi: 10.1371/journal.pone.0087750. eCollection , 2014. PMID: 24498370

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