3LF5:
reference: Study of the individual cytochrome b5 and cytochrome b5 reductase domains of Ncb5or reveals a unique heme pocket and a possible role of the CS domain., Deng B, Parthasarathy S, Wang W, Gibney BR, Battaile KP, Lovell S, Benson DR, Zhu H, J Biol Chem. 2010 Sep 24;285(39):30181-91. Epub 2010 Jul 14. PMID: 20630863

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