4OI6:
reference: Streptomyces coelicolor SCO4226 Is a Nickel Binding Protein., Lu M, Jiang YL, Wang S, Jin H, Zhang RG, Virolle MJ, Chen Y, Zhou CZ, PLoS One. 2014 Oct 6;9(10):e109660. doi: 10.1371/journal.pone.0109660., eCollection 2014. PMID: 25285530

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