Mg-protoporphyrin IX + S-adenosyl-L-methionine = Mg-protoporphyrin IX 13-monomethyl ester + S-adenosyl-L-homocysteine
mg-protoporphyrin ix + s-adenosyl-l-methionine = mg-protoporphyrin ix 13-monomethyl ester + s-adenosyl-l-homocysteine
Mg-protoporphyrin IX + S-adenosyl-L-methionine = Mg-protoporphyrin IX 13-monomethyl ester + S-adenosyl-L-homocysteine
mg-protoporphyrin ix + s-adenosyl-l-methionine = mg-protoporphyrin ix 13-monomethyl ester + s-adenosyl-l-homocysteine