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. 2014 May 23;4(2):546–565. doi: 10.3390/biom4020546

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Sketches of different copper coordination modes with (A) chicken hexarepeat, Cu (N_Im, N⁻, O_tyr⁻); (B) Cu (4N_Im) main species also at low Cu²⁺ occupancy.