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A: ATP efflux was followed in real time for 3 hours using a luciferase/luciferin-based detection system. Data represent the mean of an experiment performed in quadruple. B: PPi accumulation in 24-hour cell culture medium samples are given. Data are presented as mean +/− SE of an experiment performed in quadruple. Representative examples of at least 2 independent experiments are shown in A and B.
