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Campbell and his colleagues took ancient DNA from Siberian specimen bones and converted mammoth haemoglobin DNA sequences into RNA.
It demonstrates we can bring back aspects of the soft biology - the physiology , the biochemistry from the past. We have good records of the hard skeleton like bone and teeth but this is a new angle for studying evolution. It gives us access to a library of protein and genome variants that evolution has cooked up and simply a huge canvas to work with.