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Phylogeny of aromatic ring hydroxylating dioxygenases identified from Rancho La Brea Tar Pits. (A) Pit 91; (B) Pit 101. Bootstrap values greater than 75 are shown. Bold letters denote clones sampled from the asphalt-soil mixtures. Sequences shown in regular typeface are known dioxygenases from GenBank used here for classification. Enzyme classes are indicated by vertical bars at the right of the trees. Scale bar indicates 0.05 changes per nucleotide.
