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Back to basis: Short DNA duplexes can be packed with at least four hydrophobic, not-hydrogen-bonding biphenyl base pairs in the center of the sequence without compromising stability. Recognition of Bph occurrs by interstrand-stacking interactions as illustrated (X=biphenyl or bipyridyl). This new zipperlike recognition motif opens exciting possibilities for the introduction of new function into double-helical recognition systems based on the DNA backbone.
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Brotschi et al. (2003) studied this question.
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