Ancient Transitional Codes Shaped the Genetic Code
A model of genetic code evolution that equates the time-order of amino acid entry into the code with synthesis path-length revealed the code conserved three kinds of transition codes: Ammonium Fixers Code, Expansion Code and Overprinted Code. This reveals that not only have nucleotide triplet assignments been strongly conserved between species following divergence from the Last Common Ancestor, but triplet assignments from these earlier transition codes shaped the genetic code.
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