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. 2019 Dec 24;9(1):56. doi: 10.3390/cells9010056

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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NPs characterization. Transmission electron microscopy (TEM) of NH₂-NPs (A) and CXCL-NPs (C). (B,D) Histograms of size distribution in nm. D value (diameter) reports the average ± standard deviation (SD) in nm. The particle diameter size distribution was obtained by the measurement of at least 500 NPs.