a cytidine in rRNA + S-adenosyl-L-methionine => an N(4)-methylcytidine in rRNA + S-adenosyl-L-homocysteine + H(+)
a cytidine in rrna + s-adenosyl-l-methionine => an n(4)-methylcytidine in rrna + s-adenosyl-l-homocysteine + h(+)
a cytidine in rRNA + S-adenosyl-L-methionine => an N(4)-methylcytidine in rRNA + S-adenosyl-L-homocysteine + H(+)
a cytidine in rrna + s-adenosyl-l-methionine => an n(4)-methylcytidine in rrna + s-adenosyl-l-homocysteine + h(+)