" The genetic code is expressed in terms of triplet sequences as they would appear in a natural messenger RNA molecule. The sequence of each codon is read from left to right, starting with the 5' end and going toward the 3' end. The codons UAA, UAG, and UGA are "stop" signals that result in chain termination and are used to indicate the end of a polypeptide chain. No separate codon is required to start the polypeptide chain, since the first amino acid is always methionine (Met).

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