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What is a stop codon?

What is a stop codon? Here are some definitions.

Noun
  1. (biology) 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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Examples
Introduction of stop codon and consistent inheritance of the mutation with the disorder indicated its pathogenic nature.
The researchers changed the anticodon in their new tRNA to match up with the UAG stop codon instead of the codon for glutamine.
Gentamicin is an antibiotic that causes the RNA translation mechanism in the ribosomes to ignore such a premature stop codon, i.e. to read through it.
Evidence against either a premature stop codon or the absence of Ob gene mRNA in human obesity.
We report 3 cases with 1 homozygous and 2 heterozygous mutations at codon 37 causing a premature stop codon.
Their dystrophin gene has a point mutation in the splice receptor site of intron 6 which leads to the deletion of exon 7 in the mRNA, to a frame shift, and a premature stop codon.

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