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