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. 2018 Jun 23;16:54. doi: 10.1186/s12951-018-0380-z

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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 — The evaluation of cell’s stiffness. Young’s modulus values obtained by AFM to assess the stiffness of MDA-MB-231 cells (a) and MCF-7 cells (b). The cells were treated with fullerenol for 24 h. Error bars represent mean ± SD; *P < 0.05 and **P < 0.01 (n ≥ 100)