Humans and chimpanzees famously share more than 98% of their genome and yet the two species look and behave quite differently. This apparent paradox stretches well beyond our little corner of the tree of life; we share more than half our genes with chickens and those we share are 75% identical. Two studies published together in the December issue of Science tackled this perplexing discrepancy by showing that there may be more to a genome than meets the eye.
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