Assertion: dermis's cell | /r/MadeOf | keratin
Facets:
Source sentences:
text: At the surface, the uppermost layer consists of about 25 rows of flat dead cells that contain keratin.
text: At the skin surface, the outer layer of the epidermis constantly sheds the dead cells containing keratin.
text: Cell that contain keratin are known as keratinocytes.
text: ·Epidermis: composed mostly of keratinocytes, cells that contain keratin, the protein that gives skin its toughness (not to be confused with collagen which gives skin its resiliency).