A 3-State DNA Nanomechanical Device
Based on Hybridization Topology

The 3-state sequence-dependent device is based on the 2-state sequence dependent device. It uses the same intermediate (Frame, below) as that device, but it can assume a third state, as illustrated below. Besides the half-turn forward and back, between the PX state and JX₂ state, shown at the top of the figure, it can also undergo a contraction. The end result of this translational motion is called the BX state, indicated below. Thus, there is a translation between the JX₂ state and the BX state. A third transition, between the BX and PX states is a screw rotation.

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