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. 2018 Feb 28;9:881. doi: 10.1038/s41467-018-03268-y

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© The Author(s) 2018

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 — The bCA exhibits recoverable tensile deformation in four orders of hierarchy. a–c In situ SEM tracking on structural evolution of each orders structure in one cycle. a The length (140 μm, labeled by δ₁) was stretched to 770 μm (δ₁′) and recovered to 155 μm. b The length of a cell (9.7μm, δ₂) was stretched to 17.6 μm (δ₂′) and recovered to 10.1 μm. d In situ TEM observation of a binary laminate in one stretching-retraction cycle. Scale bars, 1 mm (a), 30 μm (b), 10 μm (c), and 100 nm (d)