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Phylogenetic tree of PcaGH protein sequences. The tree is based on the deduced amino acids encoded by the pcaGH genes and is unrooted, with CatA from Acinetobacter sp. strain ADP1 (Z36909) as the outgroup. Bootstrap values greater than 50% are indicated at branch nodes. The scale bar indicates the amount of genetic change measured as the number of amino acid substitutions per site.
