label: a 5'-end triphospho-adenylyl-adenylyl-cytidylyl-adenosine in mRNA + GDP + H(+) <=> a 5'-end (5'-triphosphoguanosine)-adenylyl-adenylyl-cytidylyl-adenosine in mRNA + diphosphate
label_lc: a 5'-end triphospho-adenylyl-adenylyl-cytidylyl-adenosine in mrna + gdp + h(+) <=> a 5'-end (5'-triphosphoguanosine)-adenylyl-adenylyl-cytidylyl-adenosine in mrna + diphosphate