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Alignment of leucine motifs of FecR homologues. Similarity search and sequence alignment were done as described in Materials and Methods. Note the highly conserved leucine residues of the leucine motif corresponding to positions 247, 254, 261, and 268 of E. coli FecR. See additional information in Martinez-Bueno et al. (18), Nelson et al. (21), and Visca et al. (31).
