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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. 3 — a Loading efficiency of Ft-RGD in various pH conditions. b RV release profile from RV@Ft-RGD in various pH conditions from 5.0 to 8.5. c The permanent RV in RV@Ft-RGD in physiological condition. d The average size change of RV@Ft-RGD in various pH conditions from 5.0 to 8.5