Expanded use of sense codons is regulated by modified cytidines in tRNA.
Cantara, W.A., Murphy, F.V., Demirci, H., Agris, P.F.(2013) Proc.Natl.Acad.Sci.USA 110: 10964-10969
- PubMed: 23781103 
- DOI: 10.1073/pnas.1222641110
- Primary Citation of Related Structures:  
- PubMed Abstract: 
Codon use among the three domains of life is not confined to the universal genetic code. With only 22 tRNA genes in mammalian mitochondria, exceptions from the universal code are necessary for proper translation. A particularly interesting deviation ...