1ULW:
reference: Structural evidence for direct hydride transfer from NADH to cytochrome P450nor., Oshima R, Fushinobu S, Su F, Zhang L, Takaya N, Shoun H, J Mol Biol 2004 Sep 3;342(1):207-17. PMID: 15313618

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