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Nucleic acid aptamers that specifically bind to other molecules are mostly obtained through the systematic evolution of ligands by exponential enrichment (SELEX). Because SELEX is a time-consuming procedure, the in silico design of specific aptamers has recently become a progressive approach. HIV-1 surface glycoprotein gp120, which is involved in the early stages of HIV-1 infection, is an attractive target for RNA and DNA aptamer selection. In this study, four single-stranded DNA aptamers, referred to as HD2, HD3, HD4, and HD5, that had