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Growth (A and C) and number of surviving cells (B and D) of L. lactis (A and B) or E. coli (C and D) after the induction of sav with nisin or IPTG, respectively. Sav indicates vector pNZ8010 (A and B) or pQE70 (C and D) with cloned sav, while c indicates an empty vector. + and − indicate induction and no induction, respectively, with nisin at time zero and IPTG at 2 min before time zero.
