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Option 4 : All I, II and III
- Keratin is produced by keratinocytes, the majority of cells in the epidermis layer of the human skin.
- It is a fibrous protein that protects the skin from various external damages.
- It also stiffens the epidermal tissues in order to form the fingernails.
- Keratin is a waterproofing protein and is present in majority of the skin of the human body.
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