> I read a paper somewhere along the line that claimed that DNA itself shows evidence of having evolved - the 3-pair codons that have some error-correcting capa

> I read a paper somewhere along the line that claimed that DNA itself shows evidence of having evolved - the 3-pair codons that have some error-correcting capacity evolved from single-pair codons. When I write that down it seems wrong, but that's what I remember. Can't recover the paper, however so you don't need to believe me. Thinking about this a little bit, what are likely traces that we could even identify in the evolution of these building blocks? If, hypothetically, single-codon DNA went "extinct," is it possible we could even find evidence of it?