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Time evolution of the twist parameter for CG dinucleotide step at bp 3 in the MD simulation of the Drew–Dickerson dodecamer. Changes in twist over the entire simulation (4 µs) are shown in the upper graphic. Four segments of 50 ns taken at t = 0 and then every 1000 ns are depicted in the graphics below. Note the transitions in twist between a low and high state. Identical results are obtained with CpG step in bp 9 (data not shown).
