label: S-methyl-L-methionyl-[protein] + S-adenosyl-L-homocysteine => L-methionyl-[protein] + S-adenosyl-L-methionine
label_lc: s-methyl-l-methionyl-[protein] + s-adenosyl-l-homocysteine => l-methionyl-[protein] + s-adenosyl-l-methionine