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. 2019 Aug 16;20(16):4006. doi: 10.3390/ijms20164006

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Correlation between free zinc and total zinc concentrations in human serum samples. The total zinc concentration was measured by inductively coupled plasma mass spectrometry (ICP-MS). Data represent values of a single determination. Free zinc concentration was measured using the method established above and represent means of n = 3 independent experiments. No significant correlation was found between total and free zinc concentration of the serum samples (Spearman rank correlation, α = 0.05).