This is flanked by bends in the helix axis of about 25 towards the major groove (Fig. 3 a).

Double strands have opposite directions and are on opposite sides of the helix axis, giving them D(1).

Eigenclass chains are parallel to the helix axis.

The radiation is linearly polarised parallel to the helix axis.

The helix axes typically are oriented about 20 degrees from their neighboring helices, a much shallower incline than in the larger helical structure of the globin fold.

Top1 generates DNA single-strand breaks that allow rotation of the cleaved strand around the double helix axis.

Rise: displacement along the helix axis.

Twist: rotation around the helix axis.

Z-DNA base pairs nearly perpendicular to the helix axis.

In this case, the magnetic force is the centripetal force which acts towards the helix axis.