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. 2017 Mar 22;7:307. doi: 10.1038/s41598-017-00332-3

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© The Author(s) 2017

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Polarized optical microscopy image of 1-cm vials containing (a) Gd-2Nal₂ and (b) DOX encapsulating Gd-2Nal₂ hydrogels. Images areobserved with a Nikon microscope.