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Archaeology: The milk revolution http://www.nature.com/news/archaeology-the-milk-revolution-1.13471

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Once the LP allele appeared, it offered a major selective advantage. In a 2004 study, researchers estimated that people with the mutation would have produced up to 19% more fertile offspring than those who lacked it. The researchers called that degree of selection “among the strongest yet seen for any gene in the genome”. ‎· "Serious" Black

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