label: a 5'-end phospho-adenosine-phospho-ribonucleoside in mRNA + beta-nicotinamide D-ribonucleotide + 2 H(+) => a 5'-end NAD(+)-phospho-ribonucleoside in mRNA + H2O
label_lc: a 5'-end phospho-adenosine-phospho-ribonucleoside in mrna + beta-nicotinamide d-ribonucleotide + 2 h(+) => a 5'-end nad(+)-phospho-ribonucleoside in mrna + h2o