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Drafting a Genetic Map of Human Diversity

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Researchers have released a first rough draft map of human genetic diversity. The map shows 1.58 million single-letter genetic differences across 71 people of European-American, African-American, and Han Chinese ancestry. The study by the company Perlegen could help improve disease treatments, but it's certain to rekindle debate over the question of race itself. NPR's Joe Palca reports.



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