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Fig. 10. TEM showing the chloride cell ultrastructure from the filamental epithelium
of tilapia exposed to 65 g l1 salinity for 120 h. (A) Deep
apical pit (A) of a multicellular complex formed by interdigitated chloride
cells and accessory cells (ACs); arrowheads, short tight junctions; asterisks,
projections of ACs. (B) Perinuclear cytoplasm of a mature chloride cell,
showing the extensively developed tubular reticulum. (C) Chloride cell at the
early stage of apoptosis. (D) Apoptotic chloride cell with a cleft nucleus and
highly condensed cytoplasm. Scale bars: 1 µm.