4RL8:
reference: Crystal structure of a COG4313 outer membrane channel., Berg Bv, Bhamidimarri SP, Winterhalter M, Sci Rep. 2015 Jul 7;5:11927. doi: 10.1038/srep11927. PMID: 26149193

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