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Phylogenetic tree of the investigated Staphylococcus strains. Inset: Enlarged view of the S. aureus branch illustrating the clustering of the strains within clonal complexes. The scale measures base-level sequence dissimilarity, showing that the S. aureus clusters differ by approximately two to ten substitutions every 1 kb while strains within each cluster differ by less than one substitution every 5 kb.
