label: guanosine(46) in tRNA + S-adenosyl-L-methionine <=> N(7)-methylguanosine(46) in tRNA + S-adenosyl-L-homocysteine
label_lc: guanosine(46) in trna + s-adenosyl-l-methionine <=> n(7)-methylguanosine(46) in trna + s-adenosyl-l-homocysteine