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a Uptake of [3H] biotin by HCEC and D407 cells in the presence of amiloride and absence of sodium and chloride ions in DPBS buffer (pH 7.4) at 37°C. Values represent mean ± SD (n = 4). A P value of < 0.05 is considered to be statistically significant and denoted by *. b Uptake of [3H] biotin by HCEC and D407 cells as a function of sodium concentration in DPBS (pH 7.4) at 37°C. Values represent mean ± SE (n = 4) of two independent experiments
