<prompt> The composition of creatine is:Glycine, arginine, methionineGlycine and histidineGlycine, glutamate, aspartateHistidine and methionine  <response>: Ans. a Glycine, arginine, methionineRef: Vasudevan Biochemistry, 8th ed. P 269 Creatinine is formed in muscle from creatine phosphate by irreversible, nonenzymatic dehydration and loss of phosphate. Glycine, arginine, and methionine all participate in creatine biosynthesis. Synthesis of creatine is completed by methylation of guanidinoacetate by S-adenosylmethionine. 