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. 2019 Oct 17;17:109. doi: 10.1186/s12951-019-0540-9

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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. 2 — Morphological characterization of HPPDC nanoparticles. TEM images of PPDC nanocores (a) and HPPDC nanoparticles (c). Size distributions of PPDC nanocores (b) and HPPDC nanoparticles (d). The weight ratio of ssPBAE/PLGA in PPDC nancores was 3/1 and the weight ratio of HA/PPDC nanocores in HPPDC nanoaprticles was 1/1. The loading contents of DOX and CXB were 3.92% and 7.98%, respectively