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Evaluation of the antimicrobial synergy of licorice extracts in L. monocytogenes ATCC 19115 in combination with (A) gentamicin, (B) kanamycin, (C) tetracycline, and (D) ciprofloxacin. Heat maps of checkerboard titration assays show the optical density at 600 nm (OD600) of L. monocytogenes. The results are representative of at least three independent experiments.
