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Phylogenetic tree of the Ria1 transcriptional regulator of different Ustilaginaceae based on similarities and differences in their protein sequence. The optimal tree with the sum of branch length = 2.49320505 is shown. The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree. The evolutionary distances are in the units of 0.1 amino acid substitutions per site
