an adenosine in mRNA + S-adenosyl-L-methionine => an N(1)-methyladenosine in mRNA + S-adenosyl-L-homocysteine + H(+)
an adenosine in mrna + s-adenosyl-l-methionine => an n(1)-methyladenosine in mrna + s-adenosyl-l-homocysteine + h(+)
an adenosine in mRNA + S-adenosyl-L-methionine => an N(1)-methyladenosine in mRNA + S-adenosyl-L-homocysteine + H(+)
an adenosine in mrna + s-adenosyl-l-methionine => an n(1)-methyladenosine in mrna + s-adenosyl-l-homocysteine + h(+)