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. 2017 Jan 1;3(1):1. doi: 10.3390/gels3010001

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Optical photos of the complexes of: (A) mPEG1.1K; and (B) mPEG2K with α-CD; and invertible supramolecular hydrogels formed by: (C) Ada-PEG1.1K; and (D) Ada-PEG2K and α-CD. Reproduced from [65] with permission. Copyright 2008 American Chemical Society.