label: a 2'-O-methyluridine in rRNA + S-adenosyl-L-homocysteine + H(+) => a uridine in rRNA + S-adenosyl-L-methionine
label_lc: a 2'-o-methyluridine in rrna + s-adenosyl-l-homocysteine + h(+) => a uridine in rrna + s-adenosyl-l-methionine