A T

Palindromic sequences binding

FIGURE 4.20 Cruciform Structure Formed from an Inverted Repeat

Because the DNA is palindromic, the strands can separate and base pair with themselves to form lateral cruciform extensions.

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FIGURE 4.21 Comparison of B-DNA, A-DNA and Z-DNA

Several structurally different versions of the double helix exist. Shown here are the normal Watson-Crick double helix, the B-form, together with the rarer A-form and Z-DNA form. From left to right: stereoscopic skeleton pairs, end view down the helix axis, and space filling models. Courtesy of Tamar Schlick.

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