label: a guanosine in 21S rRNA + S-adenosyl-L-methionine => a 2'-O-methylguanosine in 21S rRNA + S-adenosyl-L-homocysteine + H(+)
label_lc: a guanosine in 21s rrna + s-adenosyl-l-methionine => a 2'-o-methylguanosine in 21s rrna + s-adenosyl-l-homocysteine + h(+)