Figure 1
From: Reductive evolution in Streptococcus agalactiaeand the emergence of a host adapted lineage
SNP distribution along the genome sequences of CC7 strains. (a) The number of SNPs (y axis) per 1000 nt in strain CF01173 (ST7) versus strain A909 (ST7) is plotted according to the position of the corresponding fragment on the strain A909 genome (x axis). The goodness of fit to a uniform distribution was tested using a Chi square test on 19 class intervals of 100,000 nt, excluding regions of prophage SaO5, and differences in SNP distribution were found to be not significant (p = 0.20). (b) The numbers of SNPs (y axis) per 1000 nt in strains A909 (ST7) and H36B (ST6) versus strain SS1014 (ST6) are plotted according to the position of the corresponding fragment on the strain SS1014 genome (x axis). Regions of higher polymorphism, including the capsule locus (cps) and prophage SaO5, are underlined.