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. 2021 Apr 28;12:2462. doi: 10.1038/s41467-021-22802-z

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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. 4 — a Stress–strain curves of the self-healed hydrogels for increasing healing time and b comparison of the healing efficiencies estimated from tensile strength at break (SHσ) and elongation at break (SHε). Error bars represent standard deviation, n = 5 independent replicates. c Stress–strain curves of printed pristine and healed samples compared with the same curves obtained from cast pristine, and healed samples. d, e Elongation and rupture behavior during the test of d pristine sample and e 12 h healed sample (bottom).