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. 2018 May 14;15(5):984. doi: 10.3390/ijerph15050984

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© 2018 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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Heart structure of P. clarkii following 96 h exposure to a control solution (A) and 0.24 mg/L pymetrozine (B,C). Control hearts with normal structures of myocardium (m), adventitia (a) and multinucleated and branched myocardial fibers (mf). Note the netlike adventitia with cytoplasm-lacking and eccentrically located nuclei of the epithelial cells. ((A), 200×). ec, epithelial cell. Damaged hearts showing hemocytic infiltration (hi), degeneration of the myocardial fibers (dm) ((B), 200×), epithelial hyperplasia of the adventitia (ah) ((C), 200×), and vacuolation (v) (B,C). m, myocardium; n, nuclei; H&E stain, scale bars = 100 μm.