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Sectoring of the genetic code. A codon-anticodon (Ac) table is shown. The code is posited to sector from a 1→4→8→∼16→21 letter code (20 aa + Ter (Stop)). Approximate intermediates are shown. Red 1-codon sectors are not utilized in archaea and are rare in bacteria because adenine in the anticodon wobble position is negatively selected. tRNAIle (UAU) is rarely utilized as the single tRNAIle in archaea and bacteria.
