label: N(omega)-methyl-L-arginyl-[protein] + S-adenosyl-L-homocysteine + H(+) => L-arginyl-[protein] + S-adenosyl-L-methionine
label_lc: n(omega)-methyl-l-arginyl-[protein] + s-adenosyl-l-homocysteine + h(+) => l-arginyl-[protein] + s-adenosyl-l-methionine