Photo 51: x-ray diffraction pattern of DNA

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From Wikipedia:
Photo 51 is the name given to an X-ray diffraction image of a paracristalline gel composed of DNA fiber (often misinterpreted as crystallized DNA) taken by Raymond Gosling, a graduate student working under the supervision of Rosalind Franklin in May 1952 at King's College London, while working in Sir John Randall's group.
James Watson was shown the photo by his collaborator, Maurice Wilkins, without Rosalind Franklin's knowledge.
Wilkins did this, as by this time, Gosling had returned under his supervision, since Franklin was leaving King's and Randall had asked Gosling to share all his data with Wilkins. Along with Francis Crick, Watson used characteristics and features of Photo 51, together with evidence from multiple other sources, to develop the chemical model of the DNA molecule. Their model, and manuscripts by Wilkins and colleagues, and Gosling and Franklin, were first published, together, in 1953, in the same issue of Nature. In 1962, the Nobel Prize in Physiology or Medicine was awarded to Watson, Crick and Wilkins.
The prize was not awarded to Franklin; she had died four years earlier, and although there was not yet a rule against posthumous awards, the Nobel Committee generally does not make posthumous nominations. Likewise, Gosling's work was not cited by the prize committee.