Assertion: dna's structure | /r/CreatedBy | american geneticist
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text: For the next three years, the rough draft sequence was refined, extended, and further analyzed, and in April 2003, coinciding with the 50th anniversary of the publication that described the double-helical structure of DNA, written by British biophysicist Francis Crick and American geneticist and biophysicist James D. Watson , the HGP was declared complete.