guanosine in U6 snRNA + S-adenosyl-L-methionine => N(2)-methylguanosine in U6 snRNA + S-adenosyl-L-homocysteine + H(+)
guanosine in u6 snrna + s-adenosyl-l-methionine => n(2)-methylguanosine in u6 snrna + s-adenosyl-l-homocysteine + h(+)