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Carrier-mediated folic acid uptake by native mouse jejunum crypt and villus epithelial cells. Initial rate (10 min; data not shown) of carrier-mediated uptake of [3H]folic acid (9 nM) by crypt and villus intestinal epithelial cells isolated from jejunum of wild-type mice was examined in Krebs-Ringer buffer (pH 5.5). Data represent means ± SE of at least 3 independent uptake determinations performed on cells isolated from different mice.
