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A, C: Phylogenetic tree based on amino acid sequences of mature LukA (A) and LukB (C) produced by S. aureus belonging to the indicated clonal complexes (CCs). The branch length in the tree is proportional to the number of amino acid substitutions per 100 residues. B, D: Percent identity and divergence of mature LukA (B) and LukB (D) proteins produced by S. aureus belonging to the indicated CCs.
