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Griffith discovers that a factor in heat-killed, disease-causing bacteria can "transform" harmless bacteria into ones that cause disease.
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Avery's team determines that genes are composed of DNA.
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He isolated DNA from different organisms and measured the levels of each four nitrogenous bases.
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Pauling and Corey determine that the structure of a class of proteins is a helix.
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Franklin studies the DNA molecule using a technique called X-ray diffraction.
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They discovered DNA was comprised of genetic material
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Watson and Crick develop the double-helix model of the structure of DNA.
