Immunogen sequence: GIGIAPGTVV ITDIAVDSFF KPRFEQVILD NIVTRSTELD KELSEELFNC SKEIPNFPTL VGHTMCT. Catalyzes the reversible phosphorylytic cleavage of uridine and deoxyuridine to uracil and ribose- or deoxyribose-1-phosphate (PubMed:12849978, PubMed:21855639