6OQH:
reference: Quiet Outer Membrane Protein G (OmpG) Nanopore for Biosensing., Sanganna Gari RR, Seelheim P, Liang B, Tamm LK, ACS Sens. 2019 May 24;4(5):1230-1235. doi: 10.1021/acssensors.8b01645. Epub 2019 , Apr 25. PMID: 30990011

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