a 3'-end 2',3'-cyclophospho-uridine-RNA + uridine => a 3'-end uridylyl-uridine-RNA
a 3'-end 2',3'-cyclophospho-uridine-rna + uridine => a 3'-end uridylyl-uridine-rna
a 3'-end 2',3'-cyclophospho-uridine-RNA + uridine => a 3'-end uridylyl-uridine-RNA
a 3'-end 2',3'-cyclophospho-uridine-rna + uridine => a 3'-end uridylyl-uridine-rna