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. 2019 Dec 12;9:18945. doi: 10.1038/s41598-019-55430-1

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Representative mass spectra of peaks m/z 6,100 in K. pneumoniae. The peak m/z 6,100 is absent in the carbapenem- and colistin-resistant isolates (red line) and is present in the majority of the carbapenem- and colistin-susceptible isolates (green line). The average spectrum of each group of peak m/z 6,100 (a) and the spectra of all the analysed isolates (b) are shown.