Phylogram of the five pine and one spruce species. Phylogram derived using pairwise non-synonymous substitution rates of orthologous transcripts as a distance metric (not from multiple sequence alignments) and the neighbour-joining method . Branch lengths indicate the non-synonymous substitution rates between different species.
Niu et al. BMC Genomics 2013 14:263 doi:10.1186/1471-2164-14-263