label: a 5'-end diphospho-ribonucleoside in mRNA + phosphate + H(+) => a 5'-end triphospho-ribonucleoside in mRNA + H2O
label_lc: a 5'-end diphospho-ribonucleoside in mrna + phosphate + h(+) => a 5'-end triphospho-ribonucleoside in mrna + h2o