7AHC:
reference: Gating by ionic strength and safety check by cyclic-di-AMP in the ABC transporter OpuA., Sikkema HR, van den Noort M, Rheinberger J, de Boer M, Krepel ST, Schuurman-Wolters GK, Paulino C, Poolman B, Sci Adv. 2020 Nov 18;6(47). pii: 6/47/eabd7697. doi: 10.1126/sciadv.abd7697., Print 2020 Nov. PMID: 33208376

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