<prompt> Collagen most commonly contains which of the following amino acid:Proline and hydroxyprolineCysteine and cysteineGlycine and cysteineMethionine and proline  <response>: Ans. a. Proline and hydroxyprolineAMINO ACIDS REQUIRED FOR SPECIAL PRODUCTSSpecial productAmino acid requiredCollagenGlycine ProlineHydroxyprolineElastinGlycineAlanineValineProlineCreatineGlycineArginineMethioninePurineGlycineAspartateGlutamineSerinePyrimidineAspartateGlutamineGlutathioneGlycineCysteineGlutamateHistoneArginineHistidineCarnosineb-alanineHistidineHemoglobinHistidineArginineLysineKeratinHistidine:Arginine:Lysine1:12:4CholineMethionineGlycineSerineB6CarnitineLysineMethionine 