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Interesting, never trust a dogma.
Genetic Code Supports Targeted Insertion of Two Amino Acids by One Codon
"Call it the genetic version of a double-entendre. Scientific dogma dictates that various three-letter combinations of our genetic sequence each "mean" exactly one thing--each codes for a particular amino acid, the building block of proteins. But a protozoan named Euplotes crassus appears to be more versatile: One of its three-letter combinations has two meanings, coding for two different amino acids. Although the find may seem trivial, it poses a major challenge to more than 4 decades of scientific thinking.
[..]
It's sort of like a warning shot not to get too comfortable with what we think is going on."
http://sciencenow.sciencemag.org/cgi/content/full/2009/108/3?etoc
Genetic Code Supports Targeted Insertion of Two Amino Acids by One Codon
"Call it the genetic version of a double-entendre. Scientific dogma dictates that various three-letter combinations of our genetic sequence each "mean" exactly one thing--each codes for a particular amino acid, the building block of proteins. But a protozoan named Euplotes crassus appears to be more versatile: One of its three-letter combinations has two meanings, coding for two different amino acids. Although the find may seem trivial, it poses a major challenge to more than 4 decades of scientific thinking.
[..]
It's sort of like a warning shot not to get too comfortable with what we think is going on."
http://sciencenow.sciencemag.org/cgi/content/full/2009/108/3?etoc