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Influence of the Mg2+ or Ca2+ concentration on the ciprofloxacin (CIP) Papp across the lung epithelial cell monolayer (Calu-3 cells) [23,31]. The apparent permeability was evaluated in the apical-to-basal direction. The same 50 µM concentration of CIP was used in each condition, in the presence of different concentrations of Ca2+ or Mg2+.
