2F1C:
reference: Crystal Structure of the Monomeric Porin OmpG., Subbarao GV, van den Berg B, J Mol Biol. 2006 Jul 21;360(4):750-9. Epub 2006 Jun 2. PMID: 16797588

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