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Amino acid sequence comparisons of S. griseolus (Fd-1 and Fd-2) and M. smegmatis (Fdpip) ferredoxins. The three cysteine residues, which are supposed to be involved in the attachment of a [3Fe-4S] cluster and are conserved in all three proteins, are indicated in bold. Hyphens indicate gaps introduced to optimize alignments. Residues that are identical in at least two of the three sequences are boxed.
