umls-concept:C0009221 | skos:definition | MSH: 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).,NCI: A specific sequence of three adjacent bases on a strand of DNA or RNA that provides genetic code information for a particular amino acid.,NCI: In DNA or RNA, a sequence of 3 consecutive nucleotides that codes for a specific amino acid or signals the termination of gene translation (stop or termination codon). | lld:umls |