poly[d(T)].poly[d(A)].poly[d(T)]
poly[d(t)].poly[d(a)].poly[d(t)]
A triple-stranded DNA polynucleotide consisting of two strands of thymidine and residues, with a complementary strand of deoxyadenosine residues, all residues in each strand being connected by 3'→5' phosphodiester linkages.