3VY8:
reference: Identification of a cation transport pathway in Neisseria meningitidis PorB., Kattner C, Zaucha J, Jaenecke F, Zachariae U, Tanabe M, Proteins. 2012 Dec 19. doi: 10.1002/prot.24241. PMID: 23255122

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