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Fig. 6
SEM micrographs of the gill apparatus in D. rerio after 96 h of exposure to 38.5 µg/L of HgCl2: (A) degeneration of microridges in primary epithelium (arrow). Bar 20 µm; (B) wrinkled surface of primary and secondary epithelium with swelling in the distal portion of lamellae (star). Bar 20 µm; (C) increase in mucous secretion (asterisk). Bar 100 µm.
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