Stop codon (amber codon)
3 different "stop codons" in the standard genetic code, one of which is
.
wikipedia:
"Nonsense mutations are changes in DNA sequence that introduce a premature stop codon, causing any resulting protein to be abnormally shortened. This often causes a loss of function in the protein, as critical parts of the amino acid chain are no longer created. Because of this terminology, stop codons have also been referred to as nonsense codons.
[...]amber mutations were the first set of nonsense mutations to be discovered[...]"