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ArgR regulates the transcription of argC, argG, arcA, and sigB using arginine as a cofactor. Relative quantification of argR, arcA, sigB, argC, and argG mRNA and protein expression levels in L. monocytogenes wild-type and ΔArgR mutant strains under different pH conditions (7.0 and 5.5) in the presence (A–C) or absence (D–F) of exogenous arginine (10 mM). Values are expressed as Mean ± SD. The dotted lines indicate the onefold change in transcription of the interest genes.
