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A double helix of paired bases, with pairs of bases: adenine (A), cytosine (C), guanine (G), and thymine (T)
Pairs with Thymine
Pairs with Cytosine
Watson, Crick, Franklin and Wilkins
discovered the structue of DNA
X-rays onto crystallised DNA
Franklin and wilkins worked out that DNA had a helical structure with this.
Made a model
Watson and Crick used the ideas of Franklin and Wilkins along with their own knowledge to do this.