1CYI:
reference: The structure of chloroplast cytochrome c6 at 1.9 A resolution: evidence for functional oligomerization., Kerfeld CA, Anwar HP, Interrante R, Merchant S, Yeates TO, J Mol Biol 1995 Jul 28;250(5):627-47. PMID: 7623381

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