One quick swab against the inside of your cheek could open the door to new health information that medical practitioners say will help individual patients understand how their genes relate to illness.

Home DNA testing has already gained in popularity for other purposes: in exchange for a couple of hundred rands and a saliva sample, consumers can receive important information about their origins and ancestors. Websites like provide results that include ethnicity estimates and the option of seeing who else you’re matched with from customers on its database (distant cousins)...

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