Abstract
Nucleic acids are the structural supports of genetic material and therefore the key factors in many vital cellular processes. The double-stranded right-handed helix is a regular conformation adopted by both DNA and RNA in cells, but an increasing number of results point to the biological importance of alternative structures such as bulges, hairpins, branched junctions or quadruplexes. Progress in the chemical synthesis of oligonucleotides and in the knowledge of the factors that favour a particular conformation has opened new fields of research in molecular recognition and drug design.
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