Figure 4.

Phylogenetic distribution of DUS. DUS sequences have been divided into subfamilies (shown in rows) based on the clustering analysis reported in this article. Columns indicate archaeal, bacterial, and eukaryotic species as given by the COG/KOG database labeled by the abbreviation genus and species name (e.g. Bacsub for B. subtilis). Main taxons have been indicated below the plot in the form of a simplified phylogenetic tree. Numbers and shades of grey indicate the number of members in a given genome.