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. 2017 Jan 26;18(2):253. doi: 10.3390/ijms18020253

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© 2017 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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Histological sections of (a) terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate-biotin nick-end labeling (TUNEL) staining (400×); TUNEL-positive chondrocytes are brown (arrows); and (b) proliferating cell nuclear antigen (PCNA) staining (400×); PCNA-positive chondrocytes are brown (arrows).