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this is the structure of dna as first published by James Watson and Francis Crick in 1953

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tgpatterson02
In 1953, James Watson and Francis Crick announced that they have discovered that DNA has the shape of a double-helix.

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camlee5
Watson and Crick first discovered the structure of the DNA molecule. The structure was described as having a double helical structure. The structure is composed of molecules or bases called nucleotides. The structure was found to have 4 basic nucleotides or base pairs. They are namely adenine, guanine, cytosine and thymine.

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