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. 2019 May 31;8(6):771. doi: 10.3390/jcm8060771

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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/).

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LIVE/DEAD staining of cells attached to FFF 3D printed PEEK sample surfaces after culturing for 24 h: (a) 25× magnification; (b) 100× magnification [10].