5-methylcytidine(38) in tRNA + S-adenosyl-L-homocysteine + H(+) => cytidine(38) in tRNA + S-adenosyl-L-methionine
5-methylcytidine(38) in trna + s-adenosyl-l-homocysteine + h(+) => cytidine(38) in trna + s-adenosyl-l-methionine