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A diagram depicting CrtJ and AerR circuits that repress individual transcripts. Both proteins affect transcription initiation (lines with a single arrowhead) at promoters that contain distantly removed CrtJ recognition palindromes (lines with double arrows). Only CrtJ represses the bchC promoter that contains two closely spaced palindromes (8 bp apart), and only AerR represses the puf promoter, which does not contain CrtJ recognition palindromes.
