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Comment Re:Another interesting observation (Score 2, Informative) 300

Actually, it's more about efficiency and called the "wobble position". Here's a wikipedia paste since i'm lazy:
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In the genetic code there are 4^3 = 64 possible codons (tri-nucleotide sequences). For translation each of these codons requires a tRNA molecule with a complementary anticodon. If each tRNA molecule paired with its complementary mRNA codon using canonical Watson-Crick base pairing, then 64 types (species) of tRNA molecule would be required. Since most organisms have fewer than 45 species of tRNA[1], some tRNA species must pair with more than one codon. In 1966 Francis Crick proposed the Wobble hypothesis to account for this.
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http://en.wikipedia.org/wiki/Wobble_base_pair

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