label: guanosine(9) in tRNA + S-adenosyl-L-methionine => N(1)-methylguanosine(9) in tRNA + S-adenosyl-L-homocysteine + H(+)
label_lc: guanosine(9) in trna + s-adenosyl-l-methionine => n(1)-methylguanosine(9) in trna + s-adenosyl-l-homocysteine + h(+)