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Definition of Stop codon
1. Noun. (biology) , (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''. ¹
¹ Source: wiktionary.com