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. 2019 Jan 22;17:9. doi: 10.1186/s12951-019-0448-4

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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. 1 — Size-dependent cytotoxicity by AgNPs in MCF-7 and drug-resistant MCF-7/KCR cells. a Representative TEM micrographs of the synthesized citrate-coated AgNPs. b Size distribution and particle diameter of AgNPs by TEM image analysis and c by DLS. d Representative Western blot of P-glycoprotein levels in MCF-7 and MCF-7/KCR cells. e Histogram of Rhodamine 123 (RH123) retention in MCF-7 and MCF-7/KCR cells