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Figure 4. Effect of pH on [3H] biotin uptake in MDCK-MDR1 cells.
Uptake of [3H] biotin (10 nM) was measured in DPBS buffer at different pHs (pH 5.5, 6.0, 6.5, 7.0, 7.4, 8.0) at 37 °C for 5 min. Results are expressed as mean ± SD, n = 4–8.