Fig. 7From: Stem cell membrane-coated isotretinoin for acne treatmentMorphology of the skin Horney layer. Skin treated with a PBS, b STCM, c ATRA, or d STCM-ATRA-NPs for 6 h, at ×200 magnification. Skin treated with e PBS, f STCM, g ATRA, or h STCM-ATRA-NPs for 8 h, at ×900 magnificationBack to article page