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. 2017 Dec 22;7:18061. doi: 10.1038/s41598-017-18328-4

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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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Viscoelastic properties of assembled fibronectin fibrils. (A) Histogram of the number of fibronectin (FN) molecules, for stably stretched fibrils (SSFs, 362 fibrils) and fluctuating stretched fibrils (FSFs, 169 fibrils). (B) Probability of an FSF, as a function of the number of FN molecules. (C) Histogram for SSF and FSF resting stiffness values (see text for details). (D) SSF (open red circles) and FSF (blue x’s) resting stiffness values are negatively correlated with the number of FN molecules. (E) Fibril stretch (difference of stretched and resting length) and (F) substrate force are shown as a function of the number of FN molecules, for SSFs (red) and FSFs (blue). (G) Substrate force shown as a function of fibril stretch for SSFs (red) and FSFs (blue). Lines with the slope of best fit for SSFs and FSFs are shown in dashed magenta and cyan, respectively.