label: a 5'-end phospho-ribonucleoside in mRNA + NAD(+) + H(+) => a 5'-end NAD(+)-phospho-ribonucleoside in mRNA + H2O
label_lc: a 5'-end phospho-ribonucleoside in mrna + nad(+) + h(+) => a 5'-end nad(+)-phospho-ribonucleoside in mrna + h2o