what forms the nails and hairs

Question: what forms the nails and hairs
- Keywords:
  hair,
  nail
Asked by sharline1 to Peter, Jonathan, Grace, Doris, David, Ann on 5 Jun 2019.
- Grace Kago answered on 5 Jun 2019:
  
  Both the nails and hairs have a large amount of a protein called keratin, a hardened protein (that is also in skin and hair).
  
  Source: https://kidshealth.org/en/teens/skin-hair-nails.html
  https://www.dartmouth.edu/~humananatomy/part_1/chapter_4.html
  https://www.medicinenet.com/script/main/art.asp?articlekey=7762

Question: what forms the nails and hairs