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Reversibility of DQA inhibition of CFTR function and DQA cytotoxicity in FRT cells. (a) Reversibility of DQA's effects determined by apical Cl- current measurements. Data are expressed as mean of percent control ± S.E.; n = 3; P < 0.05. (b) Viability of FRT cells exposed to DQA. Data are expressed as mean of percent cell viability compared with vehicle-treated group ± S.E.; n = 3
