Fig. 19From: Thermal decomposition of the amino acids glycine, cysteine, aspartic acid, asparagine, glutamic acid, glutamine, arginine and histidineInterpretation of Arginine data. a, 1-Carbamimidoylproline, 157 Da, representing the intermediate step after ejection of NH3 from Arg. b, The final residue of Arg, C6H9N3O, 139 Da, “creatine-proline”. The creatine ring on top joins the proline ringBack to article page