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Neither toxin treatment nor BAPTA affect extracellular ATPase activity. A and B: exogenous ATP (100 nM) was added at time = 0 min to control (▪), or 1321N1 cells pretreated with toxB (▴), C3 (□) or BAPTA (▴). Extracellular [ATP] was recorded every two min using an on-line luciferin-luciferase assay. Data represent means ± SE of 3 independent experiments each performed in triplicate.
