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(A) Maximum likelihood tree generated from amino acid sequences showing relationships of staphylococcal β-lactamases. Values above the branches indicate bootstrap support. (B) Alignment of the amino acid sequences of representative type A to D β-lactamases in comparison with the SCCmec type XI-encoded type E (LGA251) β-lactamase. Highlighted residues indicate amino acids at positions 128 and 216 used to type the β-lactamase.
