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Correlation of the in vitro deposited 20(S)-protopanaxadiol (20S-PPD) amounts at 3 h in Strat-M membranes with the in vitro deposited 20S-PPD amounts at (A) 6 h and in vivo deposited 20S-PPD amounts at (B) 3 h, (C) 6 h, and (D) 12 h in the epidermis/dermis of hairless mouse skin. The bullet symbols and their error bars represent the means and standard deviations, respectively (n = 3). The solid lines represent the fitted linear regression curves.
