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Proposed indole biodegradation pathway in Acinetobacter sp. O153: step 1, indole; step 2, indole-2,3-dihydrodiol; step 3, 3-hydroxyindolin-2-one; step 4, anthranilic acid; step 5, isatin; step 6, 1H-indol-3-ol (indoxyl); step 7, indigo. Brackets indicate an intermediate not experimentally detected.
