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  1. Code Biology, Peircean Biosemiotics, and Rosen’s Relational Biology.Marcello Barbieri - 2019 - Biological Theory 14 (1):21-29.
    The classical theories of the genetic code claimed that its coding rules were determined by chemistry—either by stereochemical affinities or by metabolic reactions—but the experimental evidence has revealed a totally different reality: it has shown that any codon can be associated with any amino acid, thus proving that there is no necessary link between them. The rules of the genetic code, in other words, obey the laws of physics and chemistry but are not determined by them. They are arbitrary, or (...)
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