<prompt> Which amino acids are present in collagen?Glycine and cysteineGlycine and prolineGlycine and arginineArginine and tryptophan  <response>: The amino acid present in large quantities in collagen are GLYCINE, PROLINE and HYDROXYPROLINE.Approximately 13rd of the amino acid are contributed by Glycine i.e every 3rd amino acid in collagen is GLYCINE.Reference :- Satyanarayana 4th Edition, Pg no. 488 