1DW1:
reference: Crystal structures of an oxygen-binding cytochrome c from Rhodobacter sphaeroides., Leys D, Backers K, Meyer TE, Hagen WR, Cusanovich MA, Van Beeumen JJ, J Biol Chem 2000 May 26;275(21):16050-6. PMID: 10821858

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