Four-Stranded DNA Makes Human Debut

Contrary to biological dogma, it appears human DNA can sometimes form a quadruple helix.


In describing the two-stranded structure of DNA, Cambridge University biologists James Watson and Francis Crick gave us the image of a twisting ladder they called a double helix. The rungs were connected by pairs of chemical bases called nucleotides: Adenine (A) paired with thymine (T), and cytosine (C) with guanine (G). 

Now, 60 years later, researchers from the same institution have found a quadruple helix.


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