1PNQ:
reference: Conformational change in the NADP(H) binding domain of transhydrogenase defines four states., Sundaresan V, Yamaguchi M, Chartron J, Stout CD, Biochemistry 2003 Oct 28;42(42):12143-53. PMID: 14567675

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