Figure 3.

Maximum parsimony tree (Dollo parsimony) based on absence-presence of genomes in orthologous gene sets. The tree is unrooted. The circles indicate the level of bootstrap support, with the following color coding: red: 90–100%, yellow: 80–90%, green: 70–80%, blue: 60–70%, magenta: 40–60%. The nodes with <40% support are unmarked.