A set of three nucleotides in a
protein coding sequence that specifies individual amino
acids or a termination signal (codon, terminator). Most codons are
universal, but some organisms do not produce the transfer RNAs (RNA, transfer)
complementary to all codons. These codons are referred to as unassigned codons
(codons, nonsense).24.
A codon is a trinucleotide sequence of DNA or RNA that corresponds to a specific amino acid. The genetic code describes the relationship between the sequence of DNA bases (A, C, G, and T) in a gene and the corresponding protein sequence that it encodes. The cell reads the sequence of the gene in groups of three bases. There are 64 different codons: 61 specify amino acids while the remaining three are used as stop signals24.