2NQ2:
reference: An Inward-Facing Conformation of a Putative Metal-Chelate-Type ABC Transporter., Pinkett HW, Lee AT, Lum P, Locher KP, Rees DC, Science. 2006 Dec 7;. PMID: 17158291

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