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Evolutionary history of PctA homologs. (A) A fragment of the maximum-likelihood phylogenetic tree containing PctA, PctB, PctC, and their closest homologs. Positions of experimentally studied homologs are indicated. (B) Phyletic distribution of PctA, PctB, and PctC orthologs. The genome tree of Pseudomonas based on 120 conserved genes was generated from the Genome Taxonomy Database, and the presence of PctA, PctB, and PctC orthologs in corresponding genomes is shown by circles.
