label: cytidine(72) in tRNA(Cys) + S-adenosyl-L-methionine = 5-methylcytidine(72) in tRNA(Cys) + S-adenosyl-L-homocysteine + H(+)
label_lc: cytidine(72) in trna(cys) + s-adenosyl-l-methionine = 5-methylcytidine(72) in trna(cys) + s-adenosyl-l-homocysteine + h(+)