NUDT2 (Nudix-type Motif 2, APAH1, Bis(5'-nucleosyl)-tetraphosphatase [Asymmetrical], Diadenosine 5',5'''-P1,P4-tetraphosphate Asymmetrical Hydrolase, Diadenosine Tetraphosphatase, Ap4A Hydrolase, Ap4Aase, Nucleoside Diphosphate-linked Moiety X Motif 2)