label: an N(6)-methyladenosine in tRNA + S-adenosyl-L-homocysteine + H(+) => an adenosine in tRNA + S-adenosyl-L-methionine
label_lc: an n(6)-methyladenosine in trna + s-adenosyl-l-homocysteine + h(+) => an adenosine in trna + s-adenosyl-l-methionine