5'-end 5'-phospho-deoxyribonucleotidyl-deoxyribonucleotide(3-)  residue
5'-end 5'-phospho-deoxyribonucleotidyl-deoxyribonucleotide(3-)  residue
An organic anionic group obtained by deprotonation of the phosphate OH groups of any 5'-end 5'-phospho-deoxyribonucleotidyl-deoxyribonucleotide residue; major species at pH 7.3.