text: * The remaining CGN codons are rare in Saccharomyces cerevisiae and absent in Candida glabrata. 
  * The AUA codon is common in the gene var1 coding for the single mitochondrial ribosomal protein, but rare in genes encoding the enzymes.
  * The coding assignments of the AUA (Met or Ile) and CUU (possibly Leu, not Thr) are uncertain in Hansenula saturnus.
  * The coding assignment of Thr to CUN is uncertain in Kluyveromyces thermotolerans.