xanthosine + S-adenosyl-L-methionine => 7-methylxanthosine + S-adenosyl-L-homocysteine
xanthosine + s-adenosyl-l-methionine => 7-methylxanthosine + s-adenosyl-l-homocysteine
xanthosine + S-adenosyl-L-methionine => 7-methylxanthosine + S-adenosyl-L-homocysteine
xanthosine + s-adenosyl-l-methionine => 7-methylxanthosine + s-adenosyl-l-homocysteine