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Neighbor-joining tree of AHL lactonases based on amino acid sequences. The sequences were from the AHL lactonases experimentally identified and unidentified (labeled with GenBank accession numbers). The dendrogram was constructed by the neighbor joining method with the MUSCLE program in the MEGA 7.0 software package (1000 bootstrap replicates). Bootstrap coefficients below 50% were not shown. Scale bar, 0.2 substitutions per amino acid position.
