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Fig. 4. Effect of pH on [14C]AA uptake in MDCK-MDR1 cells.
Uptake of [14C]AA (23.5 μM) was measured in DPBS buffer at different pH values (pH 5.0, 6.0, 6.5, 7.4, 8.5) at 37 °C for 30 min. Results are shown as mean ± SD, n = 3–6. *: P < 0.05.