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. 2017 Feb 10;17:22. doi: 10.1186/s12935-017-0397-7

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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. 2 — Comparison of the percentage of NK cells characterized by CD107a⁺ phenotype. a The purity of expanded NK cells were evaluated upon immunostaining as CD3⁻CD56⁺ cells and the percentage of CD107a⁺ NK cells were assessed by flow cytometry in both NBE U87 cells and serum U87 cells. b Serum U87 cells showed higher fraction of CD107a⁺ NK cells than NBE U87 cells did. Bar graphs show the mean ± the standard error of the mean (SEM). (*P < 0.05)