One of several forms that can be assumed by a DNA double helix. A-DNA is stable in dehydrated conditions. This form is less common than the dominant form found under physiological conditions -- Β-DNA. This form is also assumed by DNA-RNA hybrid helices and by regions of double-stranded RNA. It is a right-handed helix and is a more compact form than Β-DNA.

From the BioTech Dictionary at For further information see the BioTech homenode.

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