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. 2017 Nov 9;7:15143. doi: 10.1038/s41598-017-14883-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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Concentration dependence of viscosity. η/η _w (η _w: viscosity of water) for BSA solutions (red circles) and cell extracts (green triangles: E. coli, blue squares: Xenopus eggs, black diamonds: HeLa cells). The solid and broken lines are fits of Equation (1) to the BSA and cell extract data, respectively. Error bar in x-direction stem from estimation error of the concentration and Error bar in y-direction stem from the estimation error of the effect of laser trap. This effect of laser trap on viscosity become negligible when η/η _w become large.