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Fig. 6
A linear relationship between% intracellular tyrosinase activity and melanin content obtained from positive controls (Arbutin, 8; Kojic acid, 5; A. lacucha extract, 7), remedy extracts (crude, 4; hexane, X; ethyl acetate, 2; ethanol, 9; water, 8), and active ingredients (G. glbra extract, 6; glabridin, 1). * Indicates samples tested at a concentration of 5 µg/mL.
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