6J7A:
reference: Crystal structure of a NADPH-cytochrome P450 oxidoreductase (CYPOR) and heme oxygenase 1 fusion protein implies a conformational change in CYPOR upon NADPH/NADP(+) binding., Sugishima M, Sato H, Wada K, Yamamoto K, FEBS Lett. 2019 Mar 18. doi: 10.1002/1873-3468.13360. PMID: 30883732

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