The stock aptamers and oligonucleotides (100.00 μM), as well as the working solutions of the aptamer, were prepared in 10.00 mM Tris-EDTA (TE) buffer (pH = 8.0). To obtain the special structures, aptamers and oligonucleotides were incubated at 95 °C for 5 min and then slowly cooled do...