Fig. 3
From: Understanding pneumococcal serotype 1 biology through population genomic analysis
Distribution of the single nucleotide polymorphisms (SNPs) in the genes identified in the ST217 isolates. Boxplot showing the observed (OSNP) and expected (ESNP) number of SNPs identified in each gene in the ST217 isolates. Genes with log2 (OSNP/ESNP) less than -1 were considered to be under ‘negative selection’, greater than 1 under ‘positive selection’ and under ‘neutral evolution’ for those between -1 and 1