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Science 15 December 2006:
Vol. 314. no. 5806, p. 1672
DOI: 10.1126/science.314.5806.1672a
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News of the Week

HUMAN EVOLUTION:
There's More Than One Way to Have Your Milk and Drink It, Too

Ann Gibbons

In this week's issue of Nature Genetics, researchers describe three new genetic variants that arose independently in groups of Africans; each variant allows carriers to drink milk and eat dairy products as adults. The study shows that lactose tolerance evolved more than once in response to culture. (Read more.)

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Science. ISSN 0036-8075 (print), 1095-9203 (online)