Phylogeny and numbers of syntenic pseudogenes. Phylogenic tree relating human, chimpanzee, mouse, rat, and chicken. Branch points are labeled with the number of syntenic GAPDH pseudogenes between the two branches and the approximate date of divergence. Branch lengths are not drawn in proportion to elapsed time.
Liu et al. BMC Genomics 2009 10:480 doi:10.1186/1471-2164-10-480