Figure 6

Fluidity increases with phylogenetic scale. Fluidity of multiply-resequenced species is in the range of 0.1 - 0.3 and the fluidity of all genomes included in the analysis approaches 1. Each circle represents the relative fluidity at a species (with multiple sequenced genomes) or internal node (the fluidity of all the genomes in the tree below it). Open circles are φ = 1 and black circles are φ = 0. The phylogenetic tree of 29 bacterial species was assembled using AMPHORA [2]. Branch lengths correspond to the average number of amino acid substitutions per position in well-conserved marker genes.