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. 2017 Feb 28;12:158. doi: 10.1186/s11671-017-1931-1

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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.

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Fig. 2 — Viability of A549 cells (a) and Hela cells (b) after incubation with different amounts of naked NPs for 24 h (n = 3). Data are presented as means ± SD (n = 3). c A549 cells viability cultured with Dox-loaded TPP-NPs and free Dox at different concentrations of Dox after 24 h. Data are presented as means ± SD (n = 3). #P < 0.05 vs the corresponding free Dox. d Hela cells viability cultured with Dox-loaded TPP-NPs and free Dox at different concentrations of Dox after 24 h. Data are presented as means ± SD (n = 3). *P < 0.05 vs the corresponding free Dox