label: adenosine in U6 snRNA + S-adenosyl-L-methionine = N(6)-methyladenosine in U6 snRNA + S-adenosyl-L-homocysteine + H(+)
label_lc: adenosine in u6 snrna + s-adenosyl-l-methionine = n(6)-methyladenosine in u6 snrna + s-adenosyl-l-homocysteine + h(+)