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. 2019 Sep 6;14:305. doi: 10.1186/s11671-019-3139-z

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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.

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Fig. 7 — a Circulation time of free RV and RV@Ft-RGD in blood. b The growth profile of A549 xenografted tumors after three-time intravenous injection of saline (control), RV, RV@Ft, RV@Ft-RGD + RGD, and RV@Ft-RGD. Red arrow indicates the injection time point. **P < 0.01, compared with other groups, respectively. c Body weight of tumor-bearing mice after various treatments. d Micrographs of H&E-stained tumor slices collected from different groups of mice after the end of the treatment. Scale bars are 50 μm