label: rRNA (cytosine-N4-)-methyltransferase activity
label_lc: rrna (cytosine-n4-)-methyltransferase activity
description: "Catalysis of the reaction: a cytidine in rRNA + S-adenosyl-L-methionine = an N(4)-methylcytidine in rRNA + H+ + S-adenosyl-L-homocysteine."