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. 2021 Aug 10;6:44. doi: 10.1038/s41536-021-00154-y

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© The Author(s) 2021

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a In vitro releasing curve of PLLA-HA/ACE2 fibrous membranes. b Releasing buffer collected at specified time points during release study was added into culture media of NRCMs undergone 6 h hypoxia. Representative immunofluorescence image of TUNEL (red) and nuclear visualized by DAPI (blue). Scale bars represented 50 μm. c Statistical analysis of TUNEL-positive cell counts. n = 3/group. Data were represented as the mean ± SEM and analyzed for statistical significance using One-way ANOVA followed by Tukey’s multiple comparison test; NS no significant difference; **P < 0.01 compared to the control group.