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. 2014 Apr 1;14:64. doi: 10.1186/1471-2377-14-64

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Copyright © 2014 Hertze 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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Concentrations of IGF-I, IGF-II and IGFBP-3 (the most abundant carrier in the bloodstream) in plasma. The lower, upper and middle lines correspond to the 25^th percentile, 75^th percentile and median, respectively. The whiskers at the top and bottom extend between the 95^th and the 5^th percentiles. The circles represent outliers. *p < 0.05 and **p < 0.005.