Neighbor-joining phylogenetic tree of concatenated amino acid sequences of ARHD large and small subunits obtained from the metagenome of the consortium grown on diesel fuel (bold font, colored) and the reference enzymes. Enzymes are classified into class A, B, and C ARHDs according to Chakraborty et al. (12). The tree was created with 1,000 bootstrap iterations, and values below 50% are not reported.