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How could DNA, made up of only four different nucleotides, determine the
composition of the many proteins in living organisms? This question fuelled the race
to discover the genetic code, through which information coded in DNA is translated
into proteins.

In a series of experiments the cell contents of E.…

Page 2

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Nirenberg and his team had deciphered the 64 RNA threeletter code words (codons)
for directing all 20 amino acids.


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