1XVL:
reference: The MntC crystal structure suggests that import of Mn2+ in cyanobacteria is redox controlled., Rukhman V, Anati R, Melamed-Frank M, Adir N, J Mol Biol. 2005 May 13;348(4):961-9. PMID: 15843026

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