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Phylogenetic tree of deduced amino acid sequences of aprA gene amplicons from six different oil wells of production water. The topology of the tree was obtained by the neighbor-joining method. Bold black letters indicated the OTUs detected in this study. The OTUs are shown with clone names, the number of clones of each OTU and accession numbers. The bootstrap values at the nodes of >80% (n = 1000 replicates) are reported. The scale bar represents 5% sequence divergence.
