keratin :

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ke ruh tuhn

  • n  a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves

  • Lizards build alpha-keratin in their claws.
  • Promptly (in some cases within 24 hours), their gums began to harden, and healthy new tissue began to form the outer keratin layer, forming "a coat of armor" against bacteria.
  • Linus Pauling deciphers the molecular structure of the protein keratin.

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