5Y4C:
reference: Binding mode of metal ions to the bacterial iron import protein EfeO., Temtrirath K, Okumura K, Maruyama Y, Mikami B, Murata K, Hashimoto W, Biochem Biophys Res Commun. 2017 Sep 14. pii: S0006-291X(17)31816-8. doi:, 10.1016/j.bbrc.2017.09.057. PMID: 28919419

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