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Established MRSA OU6 biofilms stained with crystal violet were treated with polymyxin B (PmB) and 600 Da BPEI for 20 h as well as the negative control (water only) and positive control (30% acetic acid). The dissolved biofilm solutions were transferred to a new plate, and the biofilm remainders are shown in a top-down view (A). The mean OD550 of the dissolved biofilm solution was measured (B). Error bars denote standard deviation (n = 10).
