Ancient DNA: Do It Right or Not at All

@article{Cooper2000AncientDD,
  title={Ancient DNA: Do It Right or Not at All},
  author={Amanda Cooper and Hendrik N. Poinar},
  journal={Science},
  year={2000},
  volume={289},
  pages={1139 - 1139}
}
At the recent 5th International Ancient DNA Conference in Manchester, U.K., reported by Erik Stokstad in his News Focus article “Divining diet and disease from DNA” (28 Jul., p. [530][1]), one presentation boldly opened with the claim that the field was now mature and could move ahead with 
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Attempts to reproduce DNA sequences from amber– and copal–preserved bees and flies have failed to detect any authentic ancient insect DNA, suggesting that DNA does not survive over millions of years even in amber, the most promising of fossil environments.
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There was a period of more than 500,000 years during which Neanderthals and the line leading to modern humans evolved independently, according to sequencing of mitochondrial DNA from Neanderthal fossil bone.
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TLDR
In samples in which the D/L ratio of aspartic acid exceeds 0.08, ancient DNA sequences could not be retrieved and Paleontological finds from which DNA sequences purportedly millions of years old show extensive racemization, and the amino acids present are mainly contaminates.
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Reply to Stoneking: ancient DNA--how do you really know when you have it?
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