4ZJO:
reference: Structures of Gate Loop Variants of the AcrB Drug Efflux Pump Bound by Erythromycin Substrate., Ababou A, Koronakis V, PLoS One. 2016 Jul 12;11(7):e0159154. doi: 10.1371/journal.pone.0159154., eCollection 2016. PMID: 27403665

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