The clustered prnB, prnC, and prnD genes are repressed by the simultaneous presence of glucose and ammonium. A derepressed mutation inactivating a CreA-binding site acts in cis only on the permease gene (prnB) while derepression of prnD and prnC is largely the result of reversal of inducer exclusion.
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Cubero et al. (2000) studied this question.
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