Figure 6.

Estimation of the most parsimonious scenario of evolution in a multifurcated tree. (a) At internal nodes having more than two children, we insert two tentative nodes, τⁱ and τⁿ. We assume that children of τⁱ (τⁿ) always (do not) inherit the target gene from τⁱ (τⁿ). (b) Description of our modification for multifurcated branching (see Materials and methods). (c) It is assumed that the gene is lost in τⁿ when the gene is inherited from v. (d) It is assumed that the gene is gained in τⁱ when the gene is not inherited from v.