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Fitness costs during growth in BHI broth (pH 6.25 and 1.5% added NaCl) at 5°C of spontaneous bacteriocin-resistant mutants of L. monocytogenes 412, 272, 322, 358, Scott A, and VDL 144. Symbols: ○, wild-type strain; ▴, pediocin-resistant mutant; ▪, nisin-resistant mutant; ⧫, pediocin- and nisin-resistant mutant (412NP).
