Genome Sequence of the Pea Aphid Acyrthosiphon pisum
The phylogeny is based on maximum likelihood analyses of a concatenated alignment of 197 widespread, single-copy proteins. The tree was rooted using chordates as the most external out group. Bars represent a comparison of the gene content of all species included in the analysis (scale on the top). Bars are subdivided to indicate different types of homology relationships; black: widespread genes that are found with a one-to-one orthology in at least 16 of the 17 species; blue: widespread genes that can be found in at least 16 of the 17 species and are sometimes present in more than one copy; red: widespread but insect-specific genes present in at least 12 of the 13 insect species; yellow: non-widespread insect-specific genes (present in less than 12 insect species); green: genes present in insects and other groups but with a patchy distribution; white: species-specific genes with no (detectable) homologs in other species (striped fraction corresponds to species-specific genes present in more than one copy). The thin red line under each bar represents the percentage of A. pisum genes that have homologs in the given species (scale across the bottom of the figure). The fractions of single genes (grey) and duplicated genes (black) for some of the species are represented as pie charts.