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. 2022 Mar 5;20:116. doi: 10.1186/s12951-022-01260-9

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© The Author(s) 2022

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. 4 — Whole-body fluorescence images of mice at different time points after being treated with free-form Cy7 and Cy7@BA-Al NPs via oral administration (a); Fluorescence images of in vitro intestine at different time points after mice being treated with free-form Cy7 and Cy7@BA-Al NPs via oral administration (b); Flow cytometric analysis and quantitative results of in vitro intestine at different time points after mice being treated with free-form Cy7 and Cy7@BA-Al NPs via oral administration, (n = 3, error bars = SD). ** = p < 0.01 (c); Fluorescence images of organs at different time points after mice being treated with free-form Cy7 and Cy7@BA-Al NPs via oral administration (d)