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. 2014 Jul 17;14:250. doi: 10.1186/1472-6882-14-250

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Copyright © 2014 Niu et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Concentration of serum testosterone in different experimental groups. YCG: young control group; NAG: natural aging group; SWPG: Shouwu pill group; SWY1G: Heshouwuyin group 1; and SWY2G: Heshouwuyin group 2. Each histogram represents the mean ± SD of the values for 10 rats. Columns with different letters represent statistically different values, while same letters indicates no significant difference.