Assertion: crick's model | /r/HasProperty | based on the information
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Source sentences:
text: Their double-helix, molecular model of DNA was then based on a single X-ray diffraction image (labeled as "Photo 51")taken by Rosalind Franklin and Raymond Gosling in May 1952, as well as the information that the DNA bases were paired—also obtained through private communications from Erwin Chargaff in the previous years.