Dendrogram and similarity comparing the amino acid sequences of allantoinases and dihydroorotases. A, PHYLIP unrooted phylogenetic tree. Plant putative allantoinase are grouped at the left, and plant reported DHO are grouped at the right. B, Similarity between allantoinases and DHOs. The similarities of amino acid sequences were calculated by CLUSTALW using default parameters, and the phylogenetic tree was created by DRAWTREE (PHYLIP unrooted phylogenetic tree) using the entire sequence of each accession number. GenBank accession numbers: black locust ALN (AY466437), potato ALN (AB061260), Arabidopsis ALN (NM 116734; locus, AT4G04955), rice ALN (CAE05739), Arabidopsis DHO (NM 118422; locus, AT4G22930), rice DHO (NM 191198), and potato DHO (AX088927). TIGR tentative consensus sequences (TCs) number: soybean ALN (TC175849), barrel medic ALN (TC77627), tomato ALN (TC116684), and potato DHO (TC119412).