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Sequence alignment of CTX-M-14, CTX-M-15, CTX-M-55, and various related hybrids. (A) The alignment of different CTX-M enzymes. The amino acids are numbered by the standard numbering scheme for the class A β-lactamases according to Ambler et al. (23). (B) Phylogenetic tree of the 6 CTX-M variants used in this study.
