label: mRNA (cytidine-5-)-methyltransferase activity
label_lc: mrna (cytidine-5-)-methyltransferase activity
description: "Catalysis of the reaction: a cytidine in mRNA + S-adenosyl-L-methionine = a 5-methylcytidine in mRNA + H+ + S-adenosyl-L-homocysteine."