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. 2021 Jul 22;11(8):1884. doi: 10.3390/nano11081884

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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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IVIS observes the fluorescence distribution in mice at 6 h and 12 h after oral administration of RES-PCAC-NPs (A). Near-infrared fluorescence images show the accumulation of NPs in the colon at different time points (6 h and 12 h) (B).