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. 2017 Oct 1;14(10):1164. doi: 10.3390/ijerph14101164

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© 2017 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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Signal protein expressions in the brain tissue. Abbreviations: Con, control group; M8: the mixture of eight common metals (Pb + Cd + Hg + Cu + Zn + Mn + Cr + Ni); M5: the mixture of five non-essential metals (Pb + Hg + Cd + Ni + Cr); M4A: the mixture of four non-essential metals (Pb + Hg + Cd + Ni); M4B: the mixture of three essential metals and one non-essential metal (Cu + Zn + Mn + Cr); M3: the mixture of three essential metals (Cu + Zn + Mn); Cr, chromium; Cu, copper; Zn, zinc; Mn, manganese.