1FT6:
reference: High-resolution structures of the oxidized and reduced states of cytochrome c554 from Nitrosomonas europaea., Iverson TM, Arciero DM, Hooper AB, Rees DC, J Biol Inorg Chem 2001 Apr;6(4):390-7. PMID: 11372197

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