Fonseca, BM, Saraiva IH, Paquete CM, Soares CM, Pacheco I, Salgueiro CA, Louro RO.  2009.  The tetraheme cytochrome from Shewanella oneidensis MR-1 shows thermodynamic bias for functional specificity of the hemes. Journal of Biological Inorganic Chemistry. 14(3):375-385.