1FGJ:
reference: The 2.8 A structure of hydroxylamine oxidoreductase from a nitrifying chemoautotrophic bacterium, Nitrosomonas europaea., Igarashi N, Moriyama H, Fujiwara T, Fukumori Y, Tanaka N, Nat Struct Biol 1997 Apr;4(4):276-84. PMID: 9095195

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