It has been 20 years since scientists put together the first rough draft of the human genome, the three billion genetic letters of DNA tightly wound inside most of our cells.Today, scientists are still struggling to decipher it.But a batch of studies published in Science on Thursday has cast a bright light into the dark recesses of the human genome by comparing it with those of 239 other mammals, including narwhals, cheetahs and screaming hairy armadillos.
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