Maximum likelihood trees for the Fusarium genus and related genera inferred from lys2. The GTR + I + Γ model was used as the model for nucleotide substitution. Branch lengths are proportional to the estimated number of nucleotide substitutions. Each codon position was analysed separately. The BP values over 75% are displayed on the nodes (BP; 1000 replicates). The branches with bold lines indicate the lineages in which positive selection has occurred with the p-value under the null hypothesis that the ω (synonymous substitutions per synonymous site/non-synonymous substitutions per non-synonymous site) of the positively selected sites is equal to 1.0. (p < 0.001).
Watanabe et al. BMC Evolutionary Biology 2011 11:322 doi:10.1186/1471-2148-11-322