Figure 2.

Functional Classifications Overview. The functional classification groups are depicted as a bar chart relative to the total size of each species membrane proteome. The last metazoan common ancestor (LMCA) (light gray pentagon) and last holozoan common ancestor (darker gray pentagon) are noted. The dendrogram represents the evolutionary relationship among the investigated organisms. The branch lengths are not relative to evolutionary distance. The dashed lines indicate unresolved lineages. Species topology including I. linei is based on ref.⁶⁰ and the A. queenslandica placement is from ref.⁶¹. The light gray colour box corresponds to vertebrate metazoans, the darker gray represents invertebrate species, the striped gray box is protostomia members, and the dark gray are the two opisthokont unicellular relatives.