label: a 3'-end 3'-phospho-ribonucleotide-RNA + ATP = a 3'-end 2',3'-cyclophospho-ribonucleotide-RNA + AMP + diphosphate
label_lc: a 3'-end 3'-phospho-ribonucleotide-rna + atp = a 3'-end 2',3'-cyclophospho-ribonucleotide-rna + amp + diphosphate