How is collagen made for its role. p1

Its primary structure is largely a repeat of the amino acids sequence glycine-proline-alanine, which forms an unbranched polypeptide chain collagen made up of 3 such poltypeptide chains wound in a triple helix that is held together by hydrogen bonds between the peptide bond NH of a glycine and a peptide c=o (carbonyl) group of amino acid in the adjacent polypeptide.