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. 2017 Feb 7;17:31. doi: 10.1186/s12866-017-0943-4

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — Effect on PAPI-1 transfer of the addition of OM (a) and LPS (b) preparations derived from strains with (+) or without (−) PAPI-1 island. Pink, PAO1-; orange, PAO1+; black, PA14+; blue, PA14-. Purple data point on (b) are LPS from Salmonella enterica used as negative control. Results were shown as mean ± SD for three independent experiments. Two-way ANOVA followed by Bonferroni post-test was used to analyze the data. All samples were compared to OM (a) or LPS (b) derived from PAO1- cells (ns: no significant difference; *, P < 0.05; **, P < 0.01; ***, P < 0.001)