a 3'-end uridylyl-2',3'-cyclophospho-uridine-RNA + a 5'-end dephospho-ribonucleoside-RNA => uridylyl-uridylyl-ribonucleotide-RNA
a 3'-end uridylyl-2',3'-cyclophospho-uridine-rna + a 5'-end dephospho-ribonucleoside-rna => uridylyl-uridylyl-ribonucleotide-rna
a 3'-end uridylyl-2',3'-cyclophospho-uridine-RNA + a 5'-end dephospho-ribonucleoside-RNA => uridylyl-uridylyl-ribonucleotide-RNA
a 3'-end uridylyl-2',3'-cyclophospho-uridine-rna + a 5'-end dephospho-ribonucleoside-rna => uridylyl-uridylyl-ribonucleotide-rna