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Absorptive fluxes of amino acids (AAs) (0.5 mM) by cecum and proximal colon. Chambered mucosal tissues were incubated with luminal Parson’s solution containing the 16 AA designated in the inset, each at 0.5 mM. Samples of the serosal bath were collected after 45 min and analyzed by 1H-NMR. Values are means ± SE. Cecum: blue bars, n = 8; proximal colon: orange bars, n = 6.
