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Recent progress in bacterial genomic analysis has revealed a vast number of genes that encode c-type cytochromes that contain multiple hemecofactors. This high number of multiheme cytochromes in several bacteria has been correlated with their great respiratory flexibility, and in what concerns biotechnological applications, has been correlated with electricity production in Microbial Fuel Cells. Desulfuromonas acetoxidans, a member of the Geobactereaceae family, is one of these organisms for which the genome was recently made available, coding for 47 putative multiheme cytochromes. The growth of D. acetoxidans in different media allowed the identification of the cytochromes dominant in each condition. The triheme cytochromec₇ is always present suggesting a key role in the bioenergetic metabolism of this organism, and a dodecaheme cytochrome of low homology with other proteins in the …