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Normal vector plots of G3C3 (red, CAT12) as well as several typical A DNA (green) and B DNA (black) oligomers. These oligomers were selected from high-quality crystal structures in the Nucleic Acid Database (http://ndbserver.rutgers.edu/). Note the clustering of black and red curves around the origin, which indicates straight helices with base pairs perpendicular to the helical axis. Note also the green arcs, which show the writhe typical of A DNA.
