a 5'-end (5'-triphosphoguanosine)-(purine-ribonucleoside) in mRNA + diphosphate => a 5'-end diphospho-(purine-ribonucleoside) in mRNA + GTP + H(+)
a 5'-end (5'-triphosphoguanosine)-(purine-ribonucleoside) in mrna + diphosphate => a 5'-end diphospho-(purine-ribonucleoside) in mrna + gtp + h(+)
a 5'-end (5'-triphosphoguanosine)-(purine-ribonucleoside) in mRNA + diphosphate => a 5'-end diphospho-(purine-ribonucleoside) in mRNA + GTP + H(+)
a 5'-end (5'-triphosphoguanosine)-(purine-ribonucleoside) in mrna + diphosphate => a 5'-end diphospho-(purine-ribonucleoside) in mrna + gtp + h(+)