[ Philosophy ] Open Question : why did the evolution of proteogenic amino acids stopped after 20 in number? Why no new proteogenic amino acid?

This question has been posted in philosophy section in order initiate awarness regarding the contradictions in the theories of molecular evolutionnwhy did the evolution of proteogenic amino acids stopped after 20 in number? Why has no new proteogenic amino acids evolved?

Source: http://answers.yahoo.com/question/index?qid=20091209011449AA7nkBd

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