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. 2017 Dec 12;7:17436. doi: 10.1038/s41598-017-17734-y

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© The Author(s) 2017

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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Time resolved bending of a water-sensing gelatin bilayer. The top layer consists of 4 wt% gelatin irradiated with 40 kGy. The bottom layer consists of 10 wt% gelatin irradiated with 5 kGy. The red line represents a two-phase exponential decay function. Inset: (a) Scheme of a stent demonstrator, (b) schematic drawing, (c) gelatin bilayer in water before deformation and (d) gelatin bilayer in water after deformation. Scale bars indicate 5 mm.