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Concentration-dependent uptake of [3H]fMet-Leu-Phe (0.1 μM to 7.5 mM total substrate in perfusate) during jejunal perfusions of wild-type mice. Studies were performed in pH 6.5 buffer with 100 mM unlabeled Phe (n = 4, mean ± SE). fMet-Leu-Phew represents mean estimated concentrations of tripeptide at the intestinal wall.
