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Silver toxicity in Lactococcus lactis. (a) Optical density at 600 nm of L. lactis carrying empty vector (filled square) and PIC2 (cross) grown for 12 h in nisin to induce gene expression in the presence of increasing concentrations of silver. (b) Cell growth of L. lactis expressing MRS3 or empty vector (VEC) grown in 120 µM silver with nisin in standard medium (M17) or in iron-depleted medium (M17+BPS).
