label: an N(7)-methylguanosine in 18S rRNA + S-adenosyl-L-homocysteine => a guanosine in 18S rRNA + S-adenosyl-L-methionine
label_lc: an n(7)-methylguanosine in 18s rrna + s-adenosyl-l-homocysteine => a guanosine in 18s rrna + s-adenosyl-l-methionine