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Periods of exposure to 1 μm noradrenaline (NA), 100 nm thapsigargin (TG), 10 μm ATP, 1 μm valinomycin are indicated by horizontal bars below the chart records of [Ca2+]i. The effect of ATP on the thapsigargin-induced [Ca2+]i increase was examined in the presence of valinomycin, as indicated. The trace is representative of 6 cells.
