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. 2018 Dec 29;6:35. doi: 10.1186/s41038-018-0138-8

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Formation of poly(ethylene glycol) lysine sulfhydryl (PEG-lysSH) and subsequent dissolution. a Thiol-thioester exchange reaction [37]. b The example of a hydrophilic PEG-lysSH hydrogel dissolution based on thiol-thioester exchange. Figures are adapted with permission from the original articles of Ghobril et al. [37] (Copyright 2013 by Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim). CME cysteine methyl eater