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The Science Book by

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RG

IN CONTEXT

BRANCH

Biology

BEFORE

1869 Friedrich Miescher first identifies DNA, in blood cells.

1920s Phoebus Levene and others analyze the components of DNA as sugars, phosphates, and four types of base.

1944 Experiments show DNA to be a carrier of genetic data.

1951 Linus Pauling proposes the alpha-helix structure for certain biological molecules.

AFTER

1963 Frederick Sanger develops sequencing methods to identify bases along DNA.

1960s DNA’s code is cracked: three DNA bases of code for each amino acid in a protein.

2010 Craig Venter and his team implant artificially made DNA into a living bacterium.

In April 1953, the answer to a fundamental mystery about ...

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