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Phylogenetic relationship analysis of the internal amino acid sequences of AfcA (Y665 to V950) (a) and EngBF (A614 to I903) (b). Database accession numbers are in parentheses. Trees were constructed with the software MEGA4 (www.megasoftware.net), with the matrix of pair distances between sequences by using the neighbor-joining cluster algorithm. The numbers at the branches are bootstrap values (confidence limits). The bar scale refers to the number of amino acid substitutions per site.
