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Maximum likelihood tree of 31 group A Streptococcus (GAS) isolates aligned against S. pyogenes isolate SF370 (accession no. AE004092·2). The multilocus sequence types (ST) are indicated by the outer circle. The scale bar represents substitutions per single nucleotide polymorphism site. The asterisk indicates a novel ST which is a single locus variant of ST330. The scale bar represents substitutions per SNP site.
