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. 2016 May 19;7:724. doi: 10.3389/fmicb.2016.00724

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Copyright © 2016 Chen, Su, Wang, Zhang, Liu, Chen and Tan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Antibiotic killing assay of planktonic and biofilm-grown cells. PCN033-PC indicates planktonic WT cells; PPK-KO-PC indicates planktonic cells of the Δppk mutant; PCN033-BC indicates biofilm-grown WT cells; PPK-KO-BC indicates biofilm-grown cells of the Δppk mutant; blank indicates no antibiotic treatment. ^***p < 0.000, ^**p < 0.01, ^*p < 0.05.