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Mt mRNA expression assessed by in situ hybridization on Danio rerio liver cryosections. (A) Weak mt mRNA hybridization signal in the control samples; (B). After 96 h of exposure to 7.7 μg/L of HgCl2, the cytoplasmic areas of the hepatocytes show positive hybridization signal; (C) Increase in hybridization signal in liver from animals exposed to 38.5 μg/L of HgCl2. All bar 45 μm.
