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Cellular uptake of [3H]-LPV in presence of increasing concentration of LPV (A), Ile-LPV (B), Met-LPV (C) and Trp-LPV (D) in MDCK-MDR1 (empty bars) and MDCK-MRP2 (filled bars) cells in DPBS (pH 7.4) at 37 °C. Each data point is expressed as mean ± standard deviation (n = 4). Uptake is expressed as percentage of control ([3H]-LPV). Asterisk (**) represents significant difference from the control (p < 0.01).
