label: a guanosine in RNA + S-adenosyl-L-methionine = an N(7)-methylguanosine in RNA + S-adenosyl-L-homocysteine
label_lc: a guanosine in rna + s-adenosyl-l-methionine = an n(7)-methylguanosine in rna + s-adenosyl-l-homocysteine