Functional profiles of representative marine <i>Synechococcus</i> and <i>Prochlorococcus</i> genomes, and of the ancestor-derived <i>Synechococcus</i> ortholog set.

<p>Functions were assigned to protein sequences that have significant hits to the Clusters of Orthologous Groups of proteins (COGs) annotation system in the Entrez Conserved Domain Database (CDD). A whole pie depicts the COG annotated gene pool of a genome. Each color represents a functional category of the COGs. The area under each color corresponds to the gene density in that COG category.