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Structure

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A collagen molecule, which usually is combined with many other molecules to form a fibre, consists of three polypeptide chains twisted into an alpha-helix.

Each polypeptide chain is thousands of amino acids long. The sequence of amino acids is cyclical:

  • three amino acids repeat
  • glycine makes up every third residue
  • proline is usually the second or the third residue
  • the residue in any chain which is not glycine nor proline may be any other amino acid and it dictates some of the physical properties of the type of collagen

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