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. 2020 Nov 29;12(12):2858. doi: 10.3390/polym12122858

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© 2020 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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Differentiation of MC3T3-E1 cells on PEEK, UHMWPE and PEEK/40wt% nHA samples determined by real-time polymerase chain reaction: (a) ALP, (b) COL1, (c) OPN, and (d) OC gene expressions. * Significant difference compared with PEEK (p < 0.05); ** significant difference compared with PEEK (p < 0.01); # significant difference compared with UHMWPE (p < 0.05); ## significant difference compared with UHMWPE (p < 0.01). Reproduced from [87] with permission of Dove Press under the Creative Commons Attribution license.