N(omega)-methyl-L-arginyl-[protein] + S-adenosyl-L-methionine = N(omega),N(omega)-dimethyl-L-arginyl-[protein] + S-adenosyl-L-homocysteine + H(+)
n(omega)-methyl-l-arginyl-[protein] + s-adenosyl-l-methionine = n(omega),n(omega)-dimethyl-l-arginyl-[protein] + s-adenosyl-l-homocysteine + h(+)
N(omega)-methyl-L-arginyl-[protein] + S-adenosyl-L-methionine = N(omega),N(omega)-dimethyl-L-arginyl-[protein] + S-adenosyl-L-homocysteine + H(+)
n(omega)-methyl-l-arginyl-[protein] + s-adenosyl-l-methionine = n(omega),n(omega)-dimethyl-l-arginyl-[protein] + s-adenosyl-l-homocysteine + h(+)