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. 2018 Aug 23;11(9):1516. doi: 10.3390/ma11091516

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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/).

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SEM high-magnification pictures characterized blood vessels on HA and Cu₅-HA after four weeks of implantation: (a,c,d) no blood vessels formed on the HA scaffolds and (d,e,f) blood vessels formed on the Cu₅-HA scaffold.