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Structure of P-DNA deduced from molecular modeling. Space-filling models of a (dG)18⋅(dC)18 fragment in B-DNA (Left) and P-DNA (Right) conformations. The backbones are colored purple, and the bases are colored blue (guanine) and yellow (cytosine). The anionic oxygens of the phosphate groups are shown in red. These models were created with the jumna program (11, 12) by imposing twisting constraints on helically symmetric DNAs with regular repeating base sequences.
