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. 2021 Aug 30;12:723152. doi: 10.3389/fmicb.2021.723152

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Copyright © 2021 Zheng, Wu, Zou, Wang, He and Guo.

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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Expression of MMP-9 and VEGF-A proteins in lung tissues. (A) Immunofluorescent staining of MMP-9 (200×, red: MMP-9; blue: DAPI). (B) Mean fluorescence intensity of MMP-9. Each bar represents the mean ± SD (n = 6, *P ≤ 0.05 vs the control group; **P ≤ 0.01 vs the control group). (C) Immunofluorescent staining of VEGF-A (200×, red: VEGF-A; blue: DAPI). (D) Mean fluorescence intensity of VEGF-A. Each bar represents the mean ± SD (n = 6, *P ≤ 0.05 vs the control group; **P ≤ 0.01 vs the control group; ns: no difference).