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. 2018 Feb 27;9:152. doi: 10.3389/fphys.2018.00152

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Copyright © 2018 Kalampouka, van Bekhoven and Elliott.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Concentration of plasma endocrine factors from younger and older participants. (A) Myostatin (free and total), (B) activin A, (C) FLRG, and (D) GDF-11 (all pg.mL⁻¹). Data are presented as grouped dot plots, with horizontal lines indicated mean in panels (A–C), median in panel (D). Note panel (D) is presented on a logarithmic y axis. N = 6 per group, closed circles indicate younger, open squares older participants. ^*Indicates significant differences as marked.