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Effect of Arg-esters at indicated concentrations on the fluidity of the Caco-2 cell membrane at the hydrophobic region of a lipid bilayer. Solutions were prepared in HBSS (10 mM), pH 7.4, and mixed with an equal volume of the DPH-labeled cell suspension. HBSS mixed in an equal volume with the DPH-labeled cell suspension was used as a control. The anisotropy parameter r values are denoted at indicated time points. Data represented as the mean ± SD (n = 3), (*P < 0.05, ****P < 0.0001).
