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. 2018 Aug 8;18:799. doi: 10.1186/s12885-018-4714-x

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© The Author(s). 2018

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 — Content of SM and DHSM in A549 and A549T. The X and Z axis represent the compose of fatty acid acyl chain and backbone chain, respectively. Comparisons were performed by the non-parametric Mann-Whitney test. Most SMs and DHSMs showed statistical significance between A549 and A549T (P < 0.0001), except for SM (d18:1/16:1) and SM (d18:2/23:0) (P > 0.05)