Talk about a 'mammoth' find. ScienceMagArchives
. But the DNA of living things buried in permafrost can persist for much, much longer, as the deep freeze slows chemical degradation.
The researchers behind the new study drilled out tiny samples from the molar of each mammoth—about a pinch of salt's worth—and attempted to extract DNA. The ravages of time had degraded the DNA into many billions of short, fragmented sequences."The more puzzle pieces you have, the harder it is to reconstruct the whole puzzle," says co-author Tom van der Valk, an evolutionary geneticist at Uppsala University.
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