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Amount of RB recovered after 24 h of an ex vivo deposition study across dermatomed porcine skin (n = 3). (a) Illustration of the total amount of RB detected at the end of the study. (b) Focus on the amount of RB detected within the skin layers and in the receptor compartment. **** p-value < 0.001, and *** p-value < 0.01.
