Z-DNA; B-DNA is the most common form of DNA and has a right-handed double helix structure. A-DNA forms in a shorter, right-handed double helix. The function of this form is to protect DNA.

Elusive Z-DNA found on nucleosomes Date: January 22, 2012 Source: BioMed Central Limited Summary: New research shows that left-handed Z-DNA, normally only found at sites where DNA is being copied ...