4RJW:
reference: Structure, Dynamics, and Substrate Specificity of the OprO Porin from Pseudomonas aeruginosa., Modi N, Ganguly S, Barcena-Uribarri I, Benz R, van den Berg B, Kleinekathofer U, Biophys J. 2015 Oct 6;109(7):1429-38. doi: 10.1016/j.bpj.2015.07.035. PMID: 26445443

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