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Fig. 2. The relationship of the K+ (A) or the Cl- (B) activity (y-axis) to the external solutions of different osmolarities (x-axis). The paramecium multimicronucleatum cells had been adapted for 18 hours to various sorbitol-adjusted extracellular osmolarities. Open circles show the ionic activities in the cytosol, closed circles show the ionic activities in the CV fluid. Each point and its vertical line is mean±s.d.