cytidine(1402) in 16S rRNA + S-adenosyl-L-methionine <=> N(4)-methylcytidine(1402) in 16S rRNA + S-adenosyl-L-homocysteine + H(+)
cytidine(1402) in 16s rrna + s-adenosyl-l-methionine <=> n(4)-methylcytidine(1402) in 16s rrna + s-adenosyl-l-homocysteine + h(+)