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The solution structure of a DNA three-way junction (3H) containing two unpaired thymidine bases at the branch site (3HT2), was determined by NMR. Arms A and B of the 3HT2 form a quasi-continuous stacked helix, which is underwound at the junction and has an increased helical rise. The unstacked arm C forms an acute angle of approximately 55 o with the unique arm A. The stacking of the unpaired...
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