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In vitro accumulation of PR in full-thickness newborn pig skin and receptor compartment after testing ethosome, liposome, 20% PG solution, and 30% hydroethanolic formulations for 24 h. Each bar represents the mean ± SEM (n = 5). ∗–∗∗∗∗: means in the same color bar with different asterisk differ significantly (P < 0.05).
