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Proposed transcriptional regulatory system of the bph and sal gene clusters in P. pseudoalcaligenes KF707. Possible regulation is shown in the absence of a substrate (A), in the presence of biphenyl (B), and in the presence of salicylate (C). See text for details. The dotted arrows indicate low levels of transcription, the small solid arrows indicate moderate levels of transcription, and the large solid arrows indicate high levels of transcription. P/O, promoter/operator.
