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. 2017 Jun 2;19:121. doi: 10.1186/s13075-017-1332-y

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Detection of mRNA expression of receptor activator of nuclear factor kappa B (RANK)/RANK ligand (RANKL)/osteoprotegerin (OPG) in rat anulus fibrosus (AF), nucleus pulposus (NP) and cartilaginous endplate (CEP) cells. Significantly higher mRNA expression levels of RANKL were found in CEP cells than those in AF and NP cells; *p < 0.05. There were no significant differences in expression levels of RANK and OPG among AF, NP and CEP cells