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Permeation of carboxyfluorescein through Caco-2 cell lines due to the presence of different absorption enhancers: (a) control; i.e. no enhancer, (b) sodium lauryl sulfate, (c) sodium glycocholate, (d) sodium taurodeoxycholate, (e) Quillaja saponaria and (f) Acanthophyllum squarrosum
