Photo 51 is an X-ray based fiber diffraction image of a paracrystalline gel composed of DNA fiber[1] taken by Raymond Gosling,[2][3] a postgraduate student working under the supervision of Maurice Wilkins and Rosalind Franklin at King's College London, while working in Sir John Randall's group.[4][5][6][7][8] The image was tagged "photo 51" because it was the 51st diffraction photograph that Franklin had taken.[9] It was critical evidence[10] in identifying the structure of DNA.[11]
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was invoked but never defined (see the help page).PHOTO 51 rosalind franklin.