Figure 2.
Different insertion/deletion rates were assumed on the phylogeny. The rate on the branches of the Bc group is α (boxed), the rate on the branch leading to the Bc group is γ (in black), the rate on the remaining branches is β (hatched). Case 1: a single constant rate throughout the phylogeny (α = β = γ). Case 2: two rates differentiate the Bc group (α, β = γ). Case 3: three rates differentiate the Bc group and the branch leading to this group (α, β, γ).
