Phylogenetic analysis of mammalian RFX genes. This phylogenetic tree was constructed based on DBDs of RFX genes for six mammalian species and C. elegans using yeast RFX gene product Crt1 as the out-group. The phylogenetic tree was bootstrapped for 100 times with the numbers at each internal node being the bootstrap values. Each ortholog group is colored differently. The species names included in this figure are abbreviated. They are: Mus–mouse (Mus musculus); Rno–Rat (Rattus norvegicus); Cfa–dog (Canis familiaris); Ptr–chimpanzee (Pan troglodytes); Mmu–monkey (Macaca mulatta) and Hsa–human (Homo sapiens).