In Streptococcus gordonii DL1, inactivation of the ccpA gene and a gene encoding an Fnr-like protein (Flp) demonstrated that CcpA was essential for carbohydrate catabolite repression and that Flp was required for optimal expression and anaerobic induction of the arginine deiminase system.
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Dong et al. (2004) studied this question.
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