CAMBRIDGE, England, Jan. 21 (UPI) -- DNA, normally structured as a double helix, has been seen in a "quadruple helix" form in human cells and could be related to cancer, British researchers say.
The double helix has been considered the normal form of DNA for 60 years, since researchers James Watson and Francis Crick described the way two long chemical chains wound up around each other to encode the information that cells need to build and maintain our bodies.