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Millions of Americans are using DNA test kits sold online to research their ancestry, either out of simple curiosity or to find answers about their identity. In a country whose population, for the most part, arrived in various waves of migration -- and where genealogy has caught the public imagination -- the DNA tests have proven wildly successful. The main companies offering the service, Ancestry and 23andMe, say they have tested between 15 million people between them.
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