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. 2018 Aug 1;9:3005. doi: 10.1038/s41467-018-05396-x

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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. 3 — Mechanical properties of PLLA-b-PEG BCCs. a AFM image and corresponding height profile of a small crystal piece broken using ultrasonication; b Side-view of PLLA-b-PEG BCC shell in dried state, showing thickness of individual layer and PLLA chain folding; c AFM force-deformation spectrum on a PLLA-b-PEG crystalsome. Error bars represent standard deviation of sample-tip distances at different forces, n = 14. Inset: AFM image of the BCC used for the indentation test and its height profile. Scale bars are 100 nm