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Stacey Dooley helps answer life-changing questions through the power of DNA. A set of adopted triplets want to discover their ethnicity, and gene therapy could stop Leo going blind.
This time, Stacy meets 31-year-old Duri, who fears she may carry a potentially fatal genetic mutation and wants to test her DNA to see if she could suffer from the same disease as her mother. Elsewhere, a woman who was adopted when she was just six-months-old wants to use DNA technology to finally uncover information about her ancestry.