1WP1:
reference: Crystal structure of the drug discharge outer membrane protein, OprM, of Pseudomonas aeruginosa: dual modes of membrane anchoring and occluded cavity end., Akama H, Kanemaki M, Yoshimura M, Tsukihara T, Kashiwagi T, Yoneyama H, Narita S, Nakagawa A, Nakae T, J Biol Chem 2004 Dec 17;279(51):52816-9. Epub 2004 Oct 26. PMID: 15507433

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