The skin contains the protein keratin, which resists physical entry into cells.
Keratin helps to adhere cells to each other and to form a protective layer on the outside of the skin. In epithelial cells, keratin proteins inside the cell attach to proteins called desmosomes on the surface.
<em><u>Keratin makes our skin tough and provides us with much-needed protection from microorganisms, physical harm, and chemical irritation.</u></em>
