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