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Fig. 3. TEM showing the chloride cell ultrastructure from the filamental epithelium
of tilapia exposed to 35 g l1 salinity for 14 days. (A)
Interlamellar epithelium. AC, accessory cell; CC, mature chloride cell; IC,
immature chloride cell; A, apical pit. (B) Multicellular complex formed by
mature and accessory chloride cells; arrowhead indicates short apical tight
junctions between CC and AC. Arrows indicate long tight junctions between CC
and PC. A, apical pit; D, desmosome. (C) Perinuclear cytoplasm of a mature
chloride cell. M, mitochondria; TR, tubular reticulum. (D) Apoptotic cell with
nuclear and cytoplasm condensation and distention of the tubular reticulum.
Scale bars: 1 µm.