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ATP activity assay in MDCKII-MDR1, MDCK-MRP2 and MDCK-BCRP cells lines post 30 min treatment with different concentrations of gatifloxacin. Ouabain, sodium azaide, and 2,4 dinitro phenol were used as positive inhibitors of ATP. *Indicates P < 0.05. **Indicates P < 0.01. Values represent mean ± standard deviation (n =8).
