...+-free medium following incubation of cells with the intracellular Ca2+ chelating agent BAPTA-AM (25 μmol l–1). Data are means ± s.e.m. of 19–128 cells from 3–16 independent preparations in A and of 28–39 cells from 3–4 independent preparations in B. Fig. 3. Changes in proton secretion rate...

... was determined by measuring the brightness of all pixels ( N =1200) in the region, and the mean brightness ± s.e.m . was obtained. Error bars were all smaller than the size of the symbol. EI-14 (10 −7 moll −1 ) was applied at time zero. Fig. 4. Oscillation of intracellular Ca2+ concentration ([Ca2+]i...