Figure 3
From: Lineage specific recombination rates and microevolution in Listeria monocytogenes
Distribution of the Interior/exterior branch length ratio of trees resulting from ClonalFrame analysis of lineage I (A) and II (B) as compared to trees simulated under the coalescent model. Both lineages show a higher internal/external branch length ratio (lineage I 1.50, P = 0.005; lineage II 1.64, P = 0.00002) than expected under the coalescent model, which is indicative of a bottleneck event during the population history.