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Age‐dependent decline of quinone levels within human epidermis. Quinone concentrations of young (20–25 years; n = 28) and aged (60–66 years; n = 28) volunteers measured in suction blister epidermis obtained from untreated forearm skin. Data are depicted as mean ± SEM. Significant differences are marked with an asterisk [*P < 0.05 for comparison between young and aged subjects (Student's t‐test)].
