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. 2018 Nov 30;3(4):38. doi: 10.3390/biomimetics3040038

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© 2018 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

Scheme of the pre-complex formation between imidazole groups and metal ions. Republished with permission of Elsevier, from [49]; permission conveyed through Copyright Clearance Center, Inc.