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Uptake of [14C] erythromycin (0.25 μCi/mL, 51.3 mCi/mmol) in MDCK-MRP2 cell monolayers in the presence of 100 μM MK-571 and 2.5mM gatifloxacin. *Indicates P < 0.05. Values represent mean ± standard deviation (n =4).