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. 2019 Aug 23;19:220. doi: 10.1186/s12935-019-0942-7

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© The Author(s) 2019

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. 5 — Exogenous SLPI could get internalized into HNSCC cells. a, b The images of HN4 cells incubated without exogenous SLPI protein. c, d The images of HN4 cells incubated with 40 μg/mL exogenous SLPI protein for 1 h. Cell nucleus was stained with DAPI (blue). Cytoskeleton was stained with phalloidine (red). SLPI was stained with FITC secondary antibody (green) (scale bar: 50 μm)