label: N(2)-methylguanosine(10) in tRNA + S-adenosyl-L-methionine <=> N(2)-dimethylguanosine(10) in tRNA + S-adenosyl-L-homocysteine + H(+)
label_lc: n(2)-methylguanosine(10) in trna + s-adenosyl-l-methionine <=> n(2)-dimethylguanosine(10) in trna + s-adenosyl-l-homocysteine + h(+)