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In vitro cumulative amount (nmol/cm2)–time profiles of 5-aminolevulinic acid (ALA) (A) and methyl (m)ALA (B) from the aqueous control (double-distilled water) and water-in-oil (W/O) emulsion systems (O1 to O3) across porcine skin. Each value represents the mean ± SD (n = 4).
