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Phylogeny of Arr enzymes. The tree shown was constructed from sequences available in the Protein Data Bank by the neighbor-joining method. At each branch, the Arr protein is indicated. Accession numbers of proteins: Arr-2, WP_020442390; Arr-cb90A7, WP_002589901.1; Arr-ms, WP_063842202; Arr-sc, WP_011028626.
