Photo 51, confirmation of the double helical structure of DNA ?

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  • Photo 51, X-ray diffraction image which confirmed the double helical structure of DNA.
  • Rosalind Franklin, the supervisor of the crystallography.
  • 1952, the year.
  • King’s College, the location of the laboratory in London, UK.

The results suggest a helical structure (which must be very closely packed) containing probably 2, 3 or 4 coaxial nucleic acid chains per helical unit and having the phosphate groups near the outside.
– Rosalind Franklin, Official Report, Feb. 1952