An expanded genetic code is an artificially modified genetic code in which one or more specific codons have been re-allocated to encode an amino acid that is not among the 22 common naturally-encoded proteinogenic amino acids. The key prerequisites to expand the genetic code are: the non-standard amino acid to encode, an unused codon to adopt, a tRNA that recognizes this codon, and a tRNA synthetase that recognizes only that tRNA and only the non-standard amino acid.
An expanded genetic code is an artificially modified genetic code in which one or more specific codons have been re-allocated to encode an amino acid that is not among the 22 common naturally-encoded proteinogenic amino acids. The key prerequisites to expand the genetic code are: the non-standard amino acid to encode, an unused codon to adopt, a tRNA that recognizes this codon, and a tRNA synthetase that recognizes only that tRNA and only the non-standard amino acid.
Source: Wikipedia "Expanded genetic code" · CC BY-SA 4.0
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