English: A hypothetical, speculative model of a 4-stranded DNA structure proposed by Tai Te Wu (PNAS 63, 400-405, 1969). It made possible the solution of the protamine-DNA structure, which had been a mystery for over 50 years (Biegeleisen, J Theoret Biol, 241:533-540, 2006). Models at modelarchive.org ma-chxa5 and ma-c88vd.
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