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Antibacterial activity of Lys109 and LysSA12 against S. aureus CCARM 3090 on stainless steel. The number of S. aureus CCARM 3090 cells was counted after treatment with Lys109 and LysSA12 at concentrations of 0 nM (negative control), 50 and 100 nM. ND, not detected. Asterisks indicate significant differences (**P < 0.01).
