Predicted evolutionary relationships of PABPs. Full-length PABP sequences were compiled from various databases (see Additional data files) and aligned using the CLUSTALW program at the European Bioinformatics Institute . The tree was constructed using the neighbor-joining method  and drawn using Phylodendron . The scale bar represents 0.1 substitutions. In the instances where no PABP name is given, only a single PABP protein has been identified in that organism.