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(A) Phylogenetic tree of ArsC based on amino acid sequences, (B) ars operon containing four genes (arsR, arsC, arsC, and arsB) and (C) another ars operon containing three genes (arsR, arsC, and arsB). ArsC sequences recovered in this study from the metagenome were in red font and suffixed with their contig names. Numbers indicated the bootstrap support (1000 replicates).
