4DX7:
reference: Transport of drugs by the multidrug transporter AcrB involves an access and a deep binding pocket that are separated by a switch-loop., Eicher T, Cha HJ, Seeger MA, Brandstatter L, El-Delik J, Bohnert JA, Kern WV, Verrey F, Grutter MG, Diederichs K, Pos KM, Proc Natl Acad Sci U S A. 2012 Apr 10;109(15):5687-92. Epub 2012 Mar 26. PMID: 22451937

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