Fig. 2From: Understanding pneumococcal serotype 1 biology through population genomic analysisEstimated evolution parameters in the ST217 SCs. Distribution of a cophenetic distances between pairs of the ST217 isolates in each SC and b Terminal phylogenetic branch lengths for the isolates in the clades. c Graph showing relationship between the phylogenetic root-to-tip distances and isolation years of the isolates for each clade: SC1-SA (blue), SC2-SA (light red) and SC3-SEA (green). Isolates in clade SC2-SA showed no evidence of molecular clock-like evolution and was not subjected to coalescent analysis. d Bayesian skyline plot showing the temporal effective population sizes (Neτ) of clades SC1-SA and SC3-SEA. P-values are shown as follows: p ≤ 0.05 (•), p ≤ 0.01 (••), p ≤ 0.001 (•••), p ≤ 0.0001 (••••) and p > 0.05 (ns)Back to article page