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. Author manuscript; available in PMC: 2012 Oct 22.
Published in final edited form as: Q Rev Biophys. 2006 Mar 6;38(4):363–371. doi: 10.1017/S0033583505004087

Fig. 3.

Fig. 3

Branched DNA Motifs. On the left is a TX molecule generated by adding a helical domain to a DX by two reciprocal exchanges between opposite polarity stands. The JX2 molecule on the right can be compared readily to its topoisomer, the PX molecule. It contains the same arrangement of strands, but it lacks two crossovers, leading to a molecule in which the top end is twisted relative to the bottom by a half-turn less than in the PX. This feature is highlighted by the alphabetic labels on the strands.