label: a 5'-end (N(7)-methyl 5'-triphosphoguanosine)-guanosine in mRNA + S-adenosyl-L-homocysteine => a 5'-end (5'-triphosphoguanosine)-guanosine in mRNA + S-adenosyl-L-methionine
label_lc: a 5'-end (n(7)-methyl 5'-triphosphoguanosine)-guanosine in mrna + s-adenosyl-l-homocysteine => a 5'-end (5'-triphosphoguanosine)-guanosine in mrna + s-adenosyl-l-methionine