2CY3:
reference: Crystal structure of cytochrome c3 from Desulfovibrio desulfuricans Norway at 1.7 A resolution., Czjzek M, Payan F, Guerlesquin F, Bruschi M, Haser R, J Mol Biol 1994 Nov 4;243(4):653-67. PMID: 7966289

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