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WASHINGTON — Apps and tech companies often provide employers and advertisers with information about your search histories, where you go, and your efforts to get pregnant. What if they also shared information about your very personal, very unchangeable DNA?

Millions of people have turned to consumer genetics tests to get a peek into their ancestry and their health, but advocates are increasingly warning that customers do not understand how their DNA data are being deployed — and whether they can really be kept anonymous.

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