2'-deoxyadenosine triphosphate 8C2O37Y44Q Antibodies Comparative Study DNA Nucleotidylexotransferase DNA, Single-Stranded Deoxyadenine Nucleotides Deoxyguanine Nucleotides EC 2.7.7.31 Journal Article K8KCC8SH6N Oligonucleotides Polydeoxyribonucleotides QOP4K539MU Research Support, U.S. Gov't, Non-P.H.S. Thymine Nucleotides deoxyguanosine triphosphate thymidine 5'-triphosphate