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. 2019 Aug 23;12(17):2693. doi: 10.3390/ma12172693

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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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(A) The results of the Alizarin Red S staining on Day 7 (original magnification ×200). The scale bar indicates 100 μm. (B) The results of the Alizarin Red S staining on Day 14 (original magnification ×200). The scale bar indicates 100 μm.