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Representative images of haematoxylin and eosin (H&E)-stained histological cross sections of a full thickness skin model (FTSm) cultured for different times (0, 2, 4, 6, 9 and 12 days) at the air–liquid interface (ALI). Primary human epidermal keratinocytes isolated from neonatal foreskin (HEKns) were seeded on top of a dermis cultured for 12 days and maintained at ALI for up to 12 days to promote epidermal differentiation. Scale bars: 100 μm.
