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In vitro permeability of HQ formulations across different membranes. (a) Strat-M® membrane; (b) Mouse skin. Key: -■- Formulation 1; -●- Formulation 2, -▲- Formulation 3; -▼- Formulation 4. # p-value < 0.05 compared to Formulation 1 and * p-value < 0.05 compared to Formulation 4.
