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Expression of dlt operon and mprF in mutant backgrounds. Relative transcript levels of genes dltA and mprF in L. casei BL23 derivative strains compared to the parental strain in the absence of nisin (A) and 10 min after nisin addition (22.5 ng ml−1) (B). (C) Relative transcript levels of L. casei BL23 and derivative strains after nisin addition (*, 22.5 ng ml−1; **, 750 ng ml−1) compared to the same strains in the absence of nisin.
