label: a ribonucleotidyl-ribonucleotide-RNA + H2O = a 3'-end ribonucleotide-RNA + a 5'-end 5'-phospho-ribonucleoside-RNA + H(+)
label_lc: a ribonucleotidyl-ribonucleotide-rna + h2o = a 3'-end ribonucleotide-rna + a 5'-end 5'-phospho-ribonucleoside-rna + h(+)