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The conserved sequence motif for amino acid recognition. (A) The sequence logo was produced using all sequences except those of cluster L4 (see Fig. S3). Amino acid numbering is according to the PctA sequence. The highly conserved region (HCR) is underlined in red. (B) Expanded view of the binding pocket of PctA-LBD containing bound l-Ile. Conserved amino acids are shown in the stick mode.
