Figure 2.

Methods of concatenation and coalescence. (A) Concatenation method joins all gene sequences of each species into each super-gene sequence. These super-gene sequences are then used in aligning and building phylogeny trees; (B) Coalescence method extracts the same gene sequences from all species and merges them into each single parallel-gene sequence file. Then all parallel-gene sequence files are aligned separately to build trees. Finally, all those trees are computed to get the final tree.