Fig. 3. K⁺ (Ai, Bi, Ci) and Cl^- activities (Aii, Bii, Cii) in the cytosol (white bars) and in the CV fluid (black bars) of P. multimicronucleatum cells adapted to choline-containing solutions (Ai, Aii), to Ca²⁺-containing solutions (Bi, Bii) and to K⁺-containing standard solutions that served as controls (Ci, Cii). The osmolarity of the adaptation solution was either 24 mosmol l^-1 (left pair of bars) or 124 mosmol l^-1 (right pair of bars). Vertical lines represent s.d. The number of measurements varies between 5 and 9; see text for details.