This motif occurs from three to eight times in eight differentproteins of Geobacter sulfurreducens. The final CXXCH motifmatches the cytochrome c family haem-binding site signature,suggesting that the sequence may be involved in haem-binding. Geobacter CxxxxCH...CXXCH motif (GSu_C4xC__C2xCH) GSu_C4xC__C2xCH