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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/).
Material probes without cells. The scale unit in each picture is the same. (A) PEEK Native; (B) PEEK NHDF-Med.; (C) PEEK NHOst-Med.; (D) Titanium Native; (E) Titanium NHDF-Med.; (F) Titanium NHOst-Med.