3CU4:
reference: Outer membrane cytochrome c, OmcF, from Geobacter sulfurreducens: High structural similarity to an algal cytochrome c(6)., Pokkuluri PR, Londer YY, Wood SJ, Duke NE, Morgado L, Salgueiro CA, Schiffer M, Proteins. 2008 Sep 2. PMID: 18837462

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