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Geobacter metallireducens pili. (A) Alignment of PilA amino acid sequences of Geobacter sulfurreducens and Geobacter metallireducens. The aromatic amino acids (F, phenylalanine; H, histidine; Y, tyrosine) are marked in red. (B) Transmission electron micrograph of G. sulfurreducens strain MP expressing abundant G. metallireducens pili.
