<prompt> Keratin contains ?ArginineHistidineLysineAll  <response>: Ans. is d i.e., All Amino acids required for specialized productsCreatine - Glycine Arginine MethionineGlutathione - Glycine Cysteine GlutamateCystine - Cysteine CysteinePurine - Glycine Aspaate Glutamate SerinePyrinidine - Asparatate GlutamineCarnosine - 13-Alanine histidineCholine - Formed with the help of methionine, glycine, serine, B6Nitric oxide - ArginineHeme - Glycinc, Succinyl CoACarnitine - Methionine lysineKeratin - Histidine; arginine; lysine 1 : 12 : 4Glutamate - Gamma-amino butyric acid GABA 