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Uptake of folic acid by preconfluent, confluent, and postconfluent Caco-2 cells. Initial rate of carrier-mediated uptake of [3H]folic acid (9 nM) by preconfluent, confluent, and postconfluent Caco-2 cells. Incubation was performed at 37°C in Krebs-Ringer buffer (pH 5.5). Folic acid uptake was determined as described in materials and methods. Data represent means ± SE of at least 3 independent uptake experiments.
