5GXU:
reference: Structure of the Arabidopsis thaliana NADPH-cytochrome P450 reductase 2 (ATR2) provides insight into its function., Niu G, Zhao S, Wang L, Dong W, Liu L, He Y, FEBS J. 2017 Mar;284(5):754-765. doi: 10.1111/febs.14017. Epub 2017 Feb 8. PMID: 28103421

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