a 5'-end (5'-triphosphoguanosine)-adenylyl-adenylyl-cytidylyl-adenosine in mRNA + 2 S-adenosyl-L-methionine => a 5'-end (N(7)-methyl 5'-triphosphoguanosine)-(2'-O-methyladenylyl)-adenylyl-cytidylyl-adenosine in mRNA + 2 S-adenosyl-L-homocysteine + H(+)
a 5'-end (5'-triphosphoguanosine)-adenylyl-adenylyl-cytidylyl-adenosine in mrna + 2 s-adenosyl-l-methionine => a 5'-end (n(7)-methyl 5'-triphosphoguanosine)-(2'-o-methyladenylyl)-adenylyl-cytidylyl-adenosine in mrna + 2 s-adenosyl-l-homocysteine + h(+)
a 5'-end (5'-triphosphoguanosine)-adenylyl-adenylyl-cytidylyl-adenosine in mRNA + 2 S-adenosyl-L-methionine => a 5'-end (N(7)-methyl 5'-triphosphoguanosine)-(2'-O-methyladenylyl)-adenylyl-cytidylyl-adenosine in mRNA + 2 S-adenosyl-L-homocysteine + H(+)
a 5'-end (5'-triphosphoguanosine)-adenylyl-adenylyl-cytidylyl-adenosine in mrna + 2 s-adenosyl-l-methionine => a 5'-end (n(7)-methyl 5'-triphosphoguanosine)-(2'-o-methyladenylyl)-adenylyl-cytidylyl-adenosine in mrna + 2 s-adenosyl-l-homocysteine + h(+)