What is human hair made of?

Question: What is human hair made of?

Asked by hollylewisdavies to Laura, Lily, Mark, Paul, Sarah on 21 Jun 2010 in Categories: General.
- Lily Asquith answered on 21 Jun 2010:
  
  Keratin
- Mark Roberts answered on 21 Jun 2010:
  
  It’s made of keratin which is a protein
- Sarah Bardsley answered on 21 Jun 2010:
  
  Proteins called Keratin.
- Laura Maliszewski answered on 21 Jun 2010:
  
  Keratin!
  
  Keratin is a protein that forms long fibers. Your fingernails are made of it too.

Question: What is human hair made of?