a moderately repetitive dna sequence , containing a tata box , a gre consensus , a z-dna forming sequence and two imperfect direct repeats at the extremities , is present a few nucleotides 5 ' of the human pai-1 gene transcription start site , raising the possibility that this gene could have been activated by dna insertion during evolution .
C0043442
z-dna
C0012854
dna