termination codon

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Biology Dictionary
	Definition:		The codons UAA, UAG and UGA, which signal the end of a polypeptide chain.
	Synonyms:		stop codon
Glossary
	Definition:		Any of three mRNA sequences (UGA, UAG, UAA) that do not code for an amino acid and thus signal the end of protein synthesis. Also known as stop codon. (See Codon)