in Nucleic Acids by

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Rosalind Franklin obtained superior X-ray diffraction photographs of DNA. His photographs concluded:

  1. DNA polynucleotide chain has the form of regular helix.
  2. The helix has a diameter of about 20 Å.
  3. The helix makes one complete turn every 34 Å along its length.
  4. The internucleotide distance is 3.4 Å.