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Cell number (line) and AI-2 activity (column) of L. plantarum KLDS1.0391 wild-type strain (black circle and black bar) and luxS mutant strain (grey circle and grey bar) during growth in a 24-h period in MRS at 37°C. Cell number and AI-2 activity have been expressed in terms of mean ± SD (n = 3). ∗p < 0.05 and ∗∗p < 0.01.
