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TEM micrographs of the gill apparatus in D. rerio after 96 h of exposure to 38.5 µg/L of HgCl2: (A) high magnification of long processes in PVCs (asterisks) and edema formation in the distal portion of lamellae (star); (B) degenerated and apoptotic PVCs (asterisks) with the disappearance of PCs. All bars 2 µm.
