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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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Photomicrographs of lung histopathology. The images (magnification 10×, 20×) represent the histopathological sections of the lung. Dark arrows in the M8 group (10×) represent edema and exudation around bronchi, and a large number of inflammatory cells infiltrations. Dark arrows in the M5 group (20×) represent a large number of lymphocytic infiltration around bronchi. 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); Cr, chromium; a, alveolar space; b, bronchioles; h, histiocytes; as, alveolar septae; v, veins.