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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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