Phylogeny among the 39 species whose genomes are available in version 49 of the ENSEMBL database. Approximate age of nodes is from . The area shaded in blue indicates long branches in vertebrates that should preferentially be interrupted by the sequencing of additional full genomes. Levels of sequence coverage are color-coded and numbers on the right of the tree indicate the ENSEMBL version in which the species appeared for the first time in the gene family trees. Mya, million years ago.