label: a 5-methyluridine in RNA + S-adenosyl-L-homocysteine + H(+) => a uridine in RNA + S-adenosyl-L-methionine
label_lc: a 5-methyluridine in rna + s-adenosyl-l-homocysteine + h(+) => a uridine in rna + s-adenosyl-l-methionine