Most living organisms have the same sort of genetic material, DNA, in their cells. DNA contains two strands wrapped around each other in a helix, and these strands are held in place by four chemicals called bases: adenine (A), guanine (G), cytosine (C) and thymine (T).
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The 1962 Nobel Prize in Physiology or Medicine was awarded for the discovery of the molecular structure of DNA – the double helix.
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