label: guanosine(527) in 16S rRNA + S-adenosyl-L-methionine => N(7)-methylguanosine(527) in 16S rRNA + S-adenosyl-L-homocysteine
label_lc: guanosine(527) in 16s rrna + s-adenosyl-l-methionine => n(7)-methylguanosine(527) in 16s rrna + s-adenosyl-l-homocysteine