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