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Alignment of amino acids of SRT-1, SST-1, and the group 1 β-lactamase, indicated SR50, from S. marcescens SR50 (15). Dashes indicate residues identical to those of SRT-1. The position of the N-terminal amino acid of the mature enzymes is designated position 1. The amino acid sequence from positions −22 to −1 is assumed to be the signal peptide.
