Abstract
The DNA heptamer d(GCGTAGC), as determined by NMR spectroscopy, occurs in aqueous solution in a temperature-and salt-dependent equilibrium between a monoloop hairpin (where the unpaired thymidine, forming the loop, is stacked on top of the guanine (G3) base) and a duplex with the unpaired thymidine residues from opposite strands intercalating and costacking between shared G:A pairs.
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