Fig. 2.

Lack of collinearity between sequence and gene content distances supports a recombination-driven delay in the molecular clock. a Phylogenetic tree of the Bacillus thuringiensis/cereus/anthracis group based on the concatenated alignment of genes shared by all members of the group. b The same tree, with branch lengths proportional to the number of gene gain and loss events estimated by phylogenomic analysis. c Comparison of pairwise distances between leaves in the sequence similarity and gene content trees, for three representative groups (the left-most plot corresponds to the trees in a and b). The red line is the fit of the recombination barrier model of sequence divergence with a long-term delay in the molecular clock equal to τ_∞. Source data are provided as a Source Data file.