Phylogeny of monomeric class II RNR from eukaryotes together with their most similar bacterial sequences. A PhyML UL3 phylogeny from an alignment of protein sequences of monomeric class II RNR enzyme from eukaryotic genomes and genomes containing similar sequences. The arrows indicate eukaryotic sequences. Top level groups from the NCBI taxonomy have been colour-coded; viruses are in italics. The tree is not formally rooted; the pseudoroot is placed so as to be consistent with the global phylogeny in Figure 1c.