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. 2021 Dec 2;9:794769. doi: 10.3389/fbioe.2021.794769

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Copyright © 2021 Wang, Li, Ma, Sun, Hou, Huang, Zhang, Guo and Yang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The result of histopathological examination. (A) H&E staining of sampled tissue on days 0, 8, 15, and 21. (B) Masson’s trichrome staining of samples on days 8, 15, and 21; scale bar: 200 µm.