Codon Sufficient Add "Terminator Codon" as a parent of "Nonsense Codon" as in MESH? http://purl.bioontology.org/ontology/MESH/D003062 SCDO:0004623 MESH:D003062 Also known as sense codon, a set of three nucleotides in a protein coding sequence that specifies individual amino acids or a termination signal (terminator codon). Most codons are universal, but some organisms do not produce the transfer RNAs complementary to all codons. These codons are referred to as unassigned codons (nonsense codons). Genetic Code