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Using DNA samples from ethnically diverse populations, they identified a collection of variations in each gene that occurred with unusually high frequency.

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"The genetic evolution of humans in the very recent past might in some ways be linked to the cultural evolution," he said.The differences between words, or DNA sequences, are a measure of how closely languages, or species, are related.Gray and Atkinson analysed 87 languages from Irish to Afghan.Lahn's own calculations acknowledge that the microcephalin variant could have arisen anywhere from 14,000 to 60,000 years ago, and that the uncertainty about the ASPM variant ranged from 500 to 14,000 years ago.Those criticisms are particularly important, Collins said, because Lahn's testing did find geographic differences in populations harboring the gene variants today.

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