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. 2021 Aug 5;13(8):1204. doi: 10.3390/pharmaceutics13081204

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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TEM images of HeLa cells after treatment with AuNR-BSA-r₈ incubated for 24 h (a–d). Red circles show the internalized AuNPs. EE: early endosomes and LE: late endosomes. Blue circles showing examples of vacant LE or EE.