double helix (Watson-Crick model) The arrangement in space of two polynucleotide chains in which each chain is wrapped around the other to form two antiparallel spirals. Each strand presents to the other the bases, purine to pyrimidine, with which it can form inter-strand hydrogen bonds. (see also A-DNA; Z-DNA)Watson, J.D and Crick, F.H.C. (1953) Nature (London) 171, 737-738
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