The instructions in a gene that tell the cell how to make
a specific protein. A, T, G, and C are the "letters" of the DNA code. They stand
for the chemicals adenine, thymine, guanine, and cytosine, respectively, that make
up the nucleotide bases of DNA. Each gene's code combines the four chemicals in
various ways to spell out 3-letter "words" that specify which amino acid is needed
at every step in making a protein.
T he discovery of the genetic code clearly ranks as one of the premiere events
in what has been called the Golden Age of Biology and Medicine.
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