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. 2019 Jun 24;471(8):1079–1094. doi: 10.1007/s00424-019-02291-2

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© The Author(s) 2019

Open Access This 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.

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Fig. 2 — Plasma activin A correlated with plasma phosphate and FGF23 in CKD rats but correlations were absent in controls. a, b Correlation between activin A and phosphate in controls (a) and CKD rats (b) revealed a positive correlation in CKD but not in control rats. c, d Similarly, a correlation between activin A and FGF23 was absent in controls (c) but present in CKD rats (d). e, f No correlation could be demonstrated between activin A and PTH in either controls (e) or CKD rats (f)