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. 2021 Mar 5;12:641894. doi: 10.3389/fphar.2021.641894

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Copyright © 2021 Ma, Xie, Li, Guo, Wang, Li, Ren, Gong and Gao.

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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Illustration of TGF-β1, BDNF, MMP9 in the serum using ELISA (n = 6). ^** p < 0.01, compared with the control group; ^# p < 0.05, ^## p < 0.01, compared with the vehicle group.