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. 2019 Feb 18;9(2):285. doi: 10.3390/nano9020285

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© 2019 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/).

PMC Copyright notice

Self-assembled DNA nanostructures on a mica surface by adjusting the Ni²⁺ ion concentration: (a) 3, (b) 4, and (c) 6 mM. Reprinted with permission from [132]. Copyright 2017 Wiley-VCH.