Termination codon: A set of three adjacent bases in the DNA or their complementary bases in messenger RNA that specifies the end of a polypeptide chain.

The three termination codons (in messenger RNA) are UAA, UAG, and UGA. They are also called chain-termination codons, stop codons, or nonsense codons.

U = uracil ; A = adenine ; G = guanine .

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