ABCG2 and mastitis: Genomic and proteomic analysis confirmed that the bacteriocin responsible for the pronounced FT27 antimicrobial activity against the main mastitis pathogens, observed up to a dilution of 1:128 of the cell-free overnight culture, was Nisin A. Shotgun proteomics enabled the detection of several components of the Nisin A production pathway, including NisA, NisB, NisE, NisI, NisK, NisP, NisR, and the ATP-binding subunit of the ABC-transporter, which are responsible for the production and release of nisin in L. lactis [20].