4HLU:
reference: Assembly and mechanism of a group II ECF transporter., Karpowich NK, Wang DN, Proc Natl Acad Sci U S A. 2013 Feb 12;110(7):2534-9. doi:, 10.1073/pnas.1217361110. Epub 2013 Jan 28. PMID: 23359690

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