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Comparison of the amino acid sequence of GES-3 with those of the GES-1, GES-2, and IBC-1 β-lactamases. Only the substituted amino acid residues are indicated by the single-letter amino acid code. Dashes represent positions where no amino acid substitution was observed among the four enzymes. The amino acid residues conserved among class A β-lactamases are indicated with asterisks.
