Samples of organs and tissues were fixed in 10% neutral formalin solution for at least 48 h, then washed in running tap water, dehydrated in ascending alcohols, and embedded in paraffin. Paraffin sections 3–5 μm thick, stained with hematoxylin and eosin, were examined using conventional light microscopy on an AxioScopeA1 microscope (Carl Zeiss, Germany). To assess the severity of histological changes, a scoring scale was used (Breljak et al., 2015 (link)).
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