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Fig. 7. Chloride cells in the gill epithelium of an adult Geotria
australis in seawater. (A) Cross section of the filament, showing a row
of chloride cells on each side of the central blood space. (B) Freeze fracture
of a bundle of parallel membranous tubules, showing the helicoidally arranged
particles (arrowheads). (C) Zonula occludens between two chloride cells
consisting of a single strand. The particles in the apical membrane of the
chloride cell are clustered on the P face. (D) Clusters of particles on the E
face. Scale bars, 3 µm (A), 0.5 µm (B,C) and 0.25 µm (D).