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Phylogenetic analysis of DHPases and DHPase-like proteins. The DHPase-like proteins include dihydropyrimidinase-related proteins (DRP), hydantoinases (HYDA), allantoinases (ALLA), dihydroorotases (DHOase) and ureases (URE). The accession numbers of the amino acid sequences follow the protein names. The clustering method was used for inferring the phylogenetic tree topology. The numbers given are frequencies at which a given branch appeared in 100 bootstrap replications.
