_:b660951 . "C26001"^^ . _:b660950 . "Collagen GenePTNCI" . "Collagen Gene"^^ . "Collagen Gene"^^ . _:b660950 . . _:b660951 . "Gene or Genome"^^ . _:b660951 . . "Collagen Genes encode different forms of Collagen, the principle fibrous protein of connective tissue, all consisting of triple helix alpha-polypeptide chains. Collagen is differentiated from other fibrous proteins by its content of proline, hydroxyproline, and hydroxylysine; by its absence of tryptophan; and by its high content of polar groups. Hydroxyproline residues likely promote the triple helical fibrous structure of collagen. (NCI)NCI" . _:b660950 . "Collagen"^^ . "Collagen_Gene"^^ . _:b660950 . "C1333079"^^ . _:b660951 .