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Phylogenetic trees of the 16S rRNA (A) and the pmoA genes (including amoA and pxmA sequences) (B). The trees were calculated in MEGA5 using the neighbor-joining method. Bootstrap support values (1,000 replicates) greater than 50% are indicated at the nodes. The sequences obtained in this study from inoculum soil and enrichment after 1 or 17 months of incubation are shown in boldface.
