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. 2016 Jan 26;21(2):144. doi: 10.3390/molecules21020144

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© 2016 by the authors.

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

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Representative histological sections of Mytilus galloprovincialis gills (H & E staining), normal gills of a control mussel 40× (a1), 20× (a2) and 10× (a3); animals exposed to 1.0 mg/L of quaternium-15, after the 18-day exposure, melanin deposit (arrow) and lack of cilia (single arrow), 20× (b); animals exposed to 1.0 mg/L of quaternium-15 after the 18-day exposure, gill filaments filled with haemocytes (arrow), 10× (c); animals exposed to 2.0 mg/L of quaternium-15, after the 18-day exposure, haemocytes inside the epithelium (arrow), and lack of cilia (double arrows), 63× (d); animals exposed to 2.0 mg/L of quaternium-15, after the 18-day exposure, goblet cells increased in volume with granules inside cytoplasm (single arrow). Double arrows indicate these granules probably during releasing process, 100× (e). Each scale bar = 50 μm.