3KLJ:
reference: Crystal structure of NADH:rubredoxin oxidoreductase from Clostridium acetobutylicum: a key component of the dioxygen scavenging system in obligatory anaerobes., Nishikawa K, Shomura Y, Kawasaki S, Niimura Y, Higuchi Y, Proteins. 2010 Mar;78(4):1066-70. PMID: 20017214

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