Phylogenetic distribution of the Rid family. Phylogenetic distribution of the Rid family. Occurrence of Rid family members is mapped onto a Tree of life (http://itol.embl.de). This phylogenetic tree of all three domains of life was constructed by Ciccarelli et al., 2006  using the alignment of a concatenation of 31 orthologous proteins occurring in ~200 representative species with sequenced genomes. Bar size indicates the number of RidA gene copies per subfamily present in each of the genomes shown. Relative genome size is indicated by the size of the outermost gray bars (excluding eukaryotes).