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Griffith discovered transformation, which is a change in genotype caused when a cell takes up foreign genetic material.
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Avery identified DNA as the transforming principle.
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Noted the nucleotide composition of DNA waries on the species.
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Suggested a helical structure that contains 2, 3, or 4 nucleic acid chains.
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Labeled the phage DNA with Phosphorus-32.
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Proposing the double helix.
