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The fluorescein transport characteristics of the human intestinal epithelial Caco-2 cell line were examined in monolayer cultures. The initial uptake rate was concentration-dependent and saturable; the Michealis constant and the maximum velocity were 0.40 mM and 1.32 nmol/min/mg protein, respectively. A protonophore, carbonyl cyanide m-chlorophenyl-hydrazone, reduced uptake significantly. The replacement...
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