Figure 1.

Outline of branch-site models used in the study.

Notes: The phylogenies illustrate the cases of two A. fumigatus duplicate genes with one A. fisheri ortholog (left) and two A. fumigatus duplicate genes with one A. fisheri orthologs (right). The two branches leading to the A. fumigatus duplicate genes are labeled with class 2 selective pressure measures ω_2,1 and ω_2,2, respectively. Phylogenies in Newick format are given under the trees. The labels #1 and #2 specify the two models in which ω_2,1 = ω_2,2 and ω_2,1 ≠ ω_2,2, respectively. Af A. fumigatus, Afis, A. fisheri.