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Proposed pathway for early steps in the catabolism of o-xylene by Rhodococcus sp. strain DK17. The enzyme and gene designations for each step in the pathway are shown. The pathway intermediates are indicated as follows: compound 1, o-xylene; compound 2, 1,2-dihydroxy-3,4-dimethylcyclohexa-3,5-diene; compound 3, 3,4-dimethylcatechol; compound 4, 2-hydroxy-5-methyl-6-oxo-hepta-2,4-dienoate.
