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The rather unique properties of prions and their presence in very different kinds of living species suggest that this type of molecule was created at a very early stage of evolution and may even represent a relic from a time where peptide evolution was ongoing and RNA/DNA did not yet exist. A comparison of the most frequently occurring amino acid sequences in known prions with the sequences preferentially formed in the salt-induced peptide formation reaction, the most simple mechanism enabling the formation of peptides under primitive earth conditions, shows a remarkable coincidence that strongly supports this hypothesis.
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