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