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Apparent permeability coefficient (Papp) values of the FITC-dextran (FD-4 with MW of 4 kDa), across the Caco-2 cell monolayers, when co-applied with the Aloe vera gel solutions. Bars marked with an asterisk (*) indicate statistical significant differences from the control (p < 0.05) (n = 3; error bars represent SD) (R = permeation-enhancement ratio).
