Genome Sequence of the Pea Aphid Acyrthosiphon pisum
(A) Size distribution of the major lineage-specific groups of in-paralogs (i.e., paralogs resulting from duplications occurring after the split of the lineages leading to the pea aphid and the louse Pediculus humanus). The y-axis (logarithmic scale) represents the number of gene families with lineage-specific expansions of a given size (x-axis), as inferred from the pea aphid phylome. (B) Maximum likelihood phylogenetic tree showing lineage-specific expansion of a family coding for Acetyl-CoA transporter. This expansion has resulted in 19 paralogs in the pea aphid, whereas other insects and out groups included in the analysis possess only a single ortholog.