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Alignment of CRS57 from strains 2077, NS48, BSA5, NS38, BSA16, and NS1140 with SIC from M1 strain AP1. The three backgrounds indicate levels of conservation. The residues conserved in all seven sequences are indicated by a black background, and the residues conserved in five or six of the seven sequences are indicated by a grey background. The downward arrowheads indicate tryptophan residues conserved in at least four sequences. The horizontal arrows indicate repeat sequences.
