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Uptake of [3H]RF by freshly isolated native rat intestinal crypt and villus epithelial cells. Carrier-mediated (initial rate) uptake of [3H]RF (24 nM) by crypt and villus intestinal epithelial cells isolated from rat jejunum was examined in Krebs-Ringer buffer (pH 7.4). Values are means ± SE of ≥3 independent uptake determinations performed on cells isolated from 3 different rats. **P < 0.05.
