guanidinoacetate + S-adenosyl-L-methionine = creatine + S-adenosyl-L-homocysteine + H(+)
guanidinoacetate + s-adenosyl-l-methionine = creatine + s-adenosyl-l-homocysteine + h(+)
"guanidinoacetate N-methyltransferase"
"guanidinoacetate n-methyltransferase"