label: a 5'-end (5'-triphosphoguanosine)-ribonucleoside in snoRNA + S-adenosyl-L-methionine <=> a 5'-end (N(7)-methyl 5'-triphosphoguanosine)-ribonucleoside in snoRNA + S-adenosyl-L-homocysteine
label_lc: a 5'-end (5'-triphosphoguanosine)-ribonucleoside in snorna + s-adenosyl-l-methionine <=> a 5'-end (n(7)-methyl 5'-triphosphoguanosine)-ribonucleoside in snorna + s-adenosyl-l-homocysteine