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Cell uptake in HK-2 cells by flow cytometry analysis. (A) Cell uptake efficiency at different concentrations of FITC-BSA. (B) The positive rates of FITC-BSA uptake at different concentrations. (C) The positive rates of FITC and FITC-BSA internalization at different time points. (D) Cell uptake at different temperatures. (E) Cell uptake in the presence of megalin inhibitors. *P < 0.05 vs. FTIC-BSA. Data represent mean ± SD (n = 3).
