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. 2021 Sep 8;18:35. doi: 10.1186/s12989-021-00428-9

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 8 — Mechanism of NPs internalization in HaCaT cells. a Binding of coronated NPs on keratinocytes surface, b magnified view of NPs on the cells surface, c, d pinocytic cups/large membrane ruffles formation, e membrane ruffles folding back on the cell surface along with the coronated NPs and f membrane surrounded intracellular compartment