label: N(2)-dimethylguanosine(26)/N(2)-dimethylguanosine(27) in tRNA + 4 S-adenosyl-L-homocysteine + 4 H(+) => guanosine(26)/guanosine(27) in tRNA + 4 S-adenosyl-L-methionine
label_lc: n(2)-dimethylguanosine(26)/n(2)-dimethylguanosine(27) in trna + 4 s-adenosyl-l-homocysteine + 4 h(+) => guanosine(26)/guanosine(27) in trna + 4 s-adenosyl-l-methionine