6FNP:
reference: Functional and structural characterization of an ECF-type ABC transporter for vitamin B12., Santos JA, Rempel S, Mous ST, Pereira CT, Ter Beek J, de Gier JW, Guskov A, Slotboom DJ, Elife. 2018 May 29;7. pii: 35828. doi: 10.7554/eLife.35828. PMID: 29809140

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