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. 2019 Aug 28;25:43. doi: 10.1186/s10020-019-0107-0

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© The Author(s) 2019

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. 7 — Melatonin improves bone metabolism in osteoporosis (OP) mice. Laboratory tests for biochemical markers of bone metabolism. Serum bone metabolism-related indicators RANKL (a), TRACP (b), OPG (c), ALP (d), phosphorus (e), calcium (f), and urinary phosphorus (g) and calcium (h) were determined after the administration of melatonin or alendronate for 2 months. Control: normal mice, Model: retinoic acid (RA)-induced OP model mice, Mlt-L: low-dose melatonin-treated OP model mice, Mlt-H: high-dose melatonin-treated OP model mice. Positive control: alendronate-treated OP mice. *, P < 0.05 vs control. #, P < 0.05 vs model; n = 6 per group