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(A) Ratios of SNP diversity per nucleotide between 1st plus 2nd codon positions and 3rd codon positions (triangles) for each sample (marked with different colors) and strain (indicated at x-axis). (B) Ratios of SNP diversity per nucleotide between 3rd and non-coding positions (circles) for each sample (marked with different colors) and strain (indicated at x-axis).
