from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of three codons, UAA, UAG, or UGA, that signal the termination of the synthesis of a protein. Also called chain termination codon.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. , (genetics), (biochemistry) a sequence of three RNA nucleotides (A, C, G or U) that instruct the synthesis, or translation, of a protein to stop. The three-letter stop codon sequences have been given names: "UAG" is amber, "UGA" is opal, and "UAA" is ochre.


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