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(a) Deferred antagonism assays of the nisin A-producing strain L. lactis DGCC10042 (A) and the stable nisin derivative-producing strain L. lactis DGCC 10042::nisV (V) against the indicator L. monocytogenes LO28. (b) Colony mass spectrometry analysis of the nisin A-producing (3,354 amu) and nisin V-producing (3,322 amu) strains utilized in this study.
