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Reduction of steady-state [Ca2+]i by ATPo in the cells pretreated with TG. (a) Comparison of steady-state [Ca2+]i decreases by ATPo in the presence and absence of Na+. Each arrow indicates the time of a puff application of ATPo (50 μM, 10 s). (b) Dose dependence of ATPo-induced decrease in [Ca2+]i. First arrow: 6 μM ATPo, 20 s; second arrow: 50 μM ATPo, 20 s. Experimental procedures in both (a) and (b) as in Figure 2b.
