2CZS:
reference: Structural and Biochemical Characterization of DHC2, a Novel Diheme Cytochrome c from Geobacter sulfurreducens(,)., Heitmann D, Einsle O, Biochemistry 2005 Sep 20;44(37):12411-9. PMID: 16156654

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